Release 0.6.0-alpha.2

This is the tiniest step towards this feature and not even
very useful, but an important proof of concept.

.cargo/config

@@ -0,0 +1,2 @@
+[target.x86_64-pc-windows-msvc]
+rustflags = ["-Ctarget-feature=+crt-static"]

.editorconfig

@@ -3,13 +3,24 @@ root = true
 [*]
 end_of_line = lf
 charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = false
 
-[*.json]
+[*.{json,js,css}]
 indent_style = space
 indent_size = 2
-trim_trailing_whitespace = true
 
 [*.md]
 indent_style = space
 indent_size = 4
-trim_trailing_whitespace = true
+
+[*.{rs,toml}]
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+
+[*.snap]
+insert_final_newline = true
+
+[*.lua]
+indent_style = tab

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        rust_version: [stable, "1.40.0"]
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Setup Rust toolchain
+      run: rustup default ${{ matrix.rust_version }}
+
+    - name: Build
+      run: cargo build --locked --verbose
+
+    - name: Run tests
+      run: cargo test --locked --verbose
+
+    - name: Rustfmt and Clippy
+      run: |
+        cargo fmt -- --check
+        cargo clippy
+      if: matrix.rust_version == 'stable'
+
+    - name: Build (All Features)
+      run: cargo build --locked --verbose --all-features
+
+    - name: Run tests (All Features)
+      run: cargo test --locked --verbose --all-features

.github/workflows/release.yml

@@ -0,0 +1,60 @@
+name: Release
+
+on:
+  push:
+    tags: ["*"]
+
+jobs:
+  windows:
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Build release binary
+      run: cargo build --verbose --locked --release
+
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v1
+      with:
+        name: rojo-win64
+        path: target/release/rojo.exe
+
+  macos:
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Install Rust
+      run: curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+
+    - name: Build release binary
+      run: |
+        source $HOME/.cargo/env
+        cargo build --verbose --locked --release
+      env:
+        OPENSSL_STATIC: 1
+
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v1
+      with:
+        name: rojo-macos
+        path: target/release/rojo
+
+  linux:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Build
+      run: cargo build --locked --verbose --release
+      env:
+        OPENSSL_STATIC: 1
+
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v1
+      with:
+        name: rojo-linux
+        path: target/release/rojo

.gitignore

@@ -1 +1,18 @@
-/site
+# Rust output directory
+/target
+
+# Headers for clibrojo
+/include
+
+# Roblox model and place files in the root, used for debugging
+/*.rbxm
+/*.rbxmx
+/*.rbxl
+/*.rbxlx
+
+# Roblox Studio holds 'lock' files on places
+*.rbxl.lock
+*.rbxlx.lock
+
+# Snapshot files from the 'insta' Rust crate
+**/*.snap.new

.gitmodules

@@ -1,18 +1,15 @@
 [submodule "plugin/modules/roact"]
 	path = plugin/modules/roact
 	url = https://github.com/Roblox/roact.git
-[submodule "plugin/modules/rodux"]
-	path = plugin/modules/rodux
-	url = https://github.com/Roblox/rodux.git
-[submodule "plugin/modules/roact-rodux"]
-	path = plugin/modules/roact-rodux
-	url = https://github.com/Roblox/roact-rodux.git
 [submodule "plugin/modules/testez"]
 	path = plugin/modules/testez
 	url = https://github.com/Roblox/testez.git
-[submodule "plugin/modules/lemur"]
-	path = plugin/modules/lemur
-	url = https://github.com/LPGhatguy/lemur.git
 [submodule "plugin/modules/promise"]
 	path = plugin/modules/promise
 	url = https://github.com/LPGhatguy/roblox-lua-promise.git
+[submodule "plugin/modules/t"]
+	path = plugin/modules/t
+	url = https://github.com/osyrisrblx/t.git
+[submodule "plugin/modules/rbx-dom"]
+	path = plugin/modules/rbx-dom
+	url = http://github.com/rojo-rbx/rbx-dom

.luacheckrc

@@ -13,12 +13,14 @@ stds.roblox = {
 
 		-- Types
 		"Vector2", "Vector3",
+		"Vector2int16", "Vector3int16",
 		"Color3",
 		"UDim", "UDim2",
 		"Rect",
 		"CFrame",
 		"Enum",
 		"Instance",
+		"DockWidgetPluginGuiInfo",
 	}
 }
 

.travis.yml

@@ -1,39 +0,0 @@
-matrix:
-  include:
-    - language: python
-      env:
-        - LUA="lua=5.1"
-
-      before_install:
-        - pip install hererocks
-        - hererocks lua_install -r^ --$LUA
-        - export PATH=$PATH:$PWD/lua_install/bin
-
-      install:
-        - luarocks install luafilesystem
-        - luarocks install busted
-        - luarocks install luacov
-        - luarocks install luacov-coveralls
-        - luarocks install luacheck
-
-      script:
-        - cd plugin
-        - luacheck src
-        - lua -lluacov spec.lua
-
-      after_success:
-        - cd plugin
-        - luacov-coveralls -e $TRAVIS_BUILD_DIR/lua_install
-
-    - language: rust
-      rust: stable
-
-      script:
-        - cd server
-        - cargo test --verbose
-    - language: rust
-      rust: beta
-
-      script:
-        - cd server
-        - cargo test --verbose

CHANGELOG.md

@@ -0,0 +1,296 @@
+# Rojo Changelog
+
+## Unreleased Changes for 0.6.x
+
+## [0.6.0 Alpha 2](https://github.com/rojo-rbx/rojo/releases/tag/v0.6.0-alpha.2) (March 6, 2020)
+* Fixed `rojo upload` command always uploading models.
+* Removed `--kind` parameter to `rojo upload`; Rojo now automatically uploads the correct kind of asset based on your project file.
+
+## [0.5.4](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.4) (February 26, 2020)
+This is a general maintenance release for the Rojo 0.5.x release series.
+
+* Updated reflection database and other dependencies.
+* First stable release with binaries for macOS and Linux.
+
+## [0.6.0 Alpha 1](https://github.com/rojo-rbx/rojo/releases/tag/v0.6.0-alpha.1) (January 22, 2020)
+
+### General
+* Added support for nested project files. ([#95](https://github.com/rojo-rbx/rojo/issues/95))
+* Added project file hot-reloading. ([#10](https://github.com/rojo-rbx/rojo/issues/10)])
+* Fixed Rojo dropping Ref properties ([#142](https://github.com/rojo-rbx/rojo/issues/142))
+    * This means that properties like `PrimaryPart` now work!
+* Improved live sync protocol to reduce round-trips and improve syncing consistency.
+* Improved support for binary model files and places.
+
+### Command Line
+* Added `--verbose`/`-v` flag, which can be specified multiple times to increase verbosity.
+* Added support for automatically finding Roblox Studio's auth cookie for `rojo upload` on Windows.
+* Added support for building, serving and uploading sources that aren't Rojo projects.
+* Improved feedback from `rojo serve`.
+* Removed support for legacy `roblox-project.json` projects, deprecated in an early Rojo 0.5.0 alpha.
+* Rojo no longer traverses directories upwards looking for project files.
+    * Though undocumented, Rojo 0.5.x will search for a project file contained in any ancestor folders. This feature was removed to better support other 0.6.x features.
+
+### Roblox Studio Plugin
+* Added "connecting" state to improve experience when live syncing.
+* Added "error" state to show errors in a place that isn't the output panel.
+* Improved diagnostics for when the Rojo plugin cannot create an instance.
+
+## [0.5.3](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.3) (October 15, 2019)
+* Fixed an issue where Rojo would throw an error when encountering recently-added instance classes.
+
+## [0.5.2](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.2) (October 14, 2019)
+* Fixed an issue where `LocalizationTable` instances would have their column order randomized. ([#173](https://github.com/rojo-rbx/rojo/issues/173))
+
+## [0.5.1](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.1) (October 4, 2019)
+* Fixed an issue where Rojo would drop changes if they happened too quickly ([#252](https://github.com/rojo-rbx/rojo/issues/252))
+* Improved diagnostics for when the Rojo plugin cannot create an instance.
+* Updated dependencies
+    * This brings Rojo's reflection database from client release 395 to client release 404.
+
+## [0.5.0](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.0) (August 27, 2019)
+* Changed `.model.json` naming, which may require projects to migrate ambiguous cases:
+    * The file name now takes precedence over the `Name` field in the model, like Rojo 0.4.x.
+    * The `Name` field of the top-level instance is now optional. It's recommended that you remove it from your models.
+    * Rojo will emit a warning when `Name` is specified and does not match the name from the file.
+* Fixed `Rect` values being set to `0, 0, 0, 0` when synced with the Rojo plugin. ([#201](https://github.com/rojo-rbx/rojo/issues/201))
+* Fixed live-syncing of `PhysicalProperties`, `NumberSequence`, and `ColorSequence` values
+
+## [0.5.0 Alpha 13](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.0-alpha.13) (August 2, 2019)
+* Bumped minimum Rust version to 1.34.0.
+* Fixed default port documentation in `rojo serve --help` ([#219](https://github.com/rojo-rbx/rojo/issues/219))
+* Fixed BrickColor support by upgrading Roblox-related dependencies
+
+## [0.5.0 Alpha 12](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.0-alpha.12) (July 2, 2019)
+* Added `.meta.json` files
+    * `init.meta.json` files replace `init.model.json` files from Rojo 0.4.x ([#183](https://github.com/rojo-rbx/rojo/pull/183))
+    * Other `.meta.json` files allow attaching extra data to other files ([#189](https://github.com/rojo-rbx/rojo/pull/189))
+* Added support for infinite and NaN values in types like `Vector2` when building models and places.
+    * These types aren't supported for live-syncing yet due to limitations around JSON encoding.
+* Added support for using `SharedString` values when building XML models and places.
+* Added support for live-syncing `CollectionService` tags.
+* Added a warning when building binary place files, since they're still experimental and have bugs.
+* Added a warning when trying to use Rojo 0.5.x with a Rojo 0.4.x-only project.
+* Added a warning when a Rojo project contains keys that start with `$`, which are reserved names. ([#191](https://github.com/rojo-rbx/rojo/issues/191))
+* Rojo now throws an error if unknown keys are found most files.
+* Added an icon to the plugin's toolbar button
+* Changed the plugin to use a docking widget for all UI.
+* Changed the plugin to ignore unknown properties when live-syncing.
+    * Rojo's approach to this problem might change later, like with a strict model mode ([#190](https://github.com/rojo-rbx/rojo/issues/190)) or another approach.
+* Upgraded to reflection database from client release 388.
+* Updated Rojo's branding to shift the color palette to make it work better on dark backgrounds
+
+## [0.5.0 Alpha 11](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.0-alpha.11) (May 29, 2019)
+* Added support for implicit property values in JSON model files ([#154](https://github.com/rojo-rbx/rojo/pull/154))
+* `Content` propertyes can now be specified in projects and model files as regular string literals.
+* Added support for `BrickColor` properties.
+* Added support for properties added in client release 384, like `Lighting.Technology` being set to `"ShadowMap"`.
+* Improved performance when working with XML models and places
+* Fixed serializing empty `Content` properties as XML
+* Fixed serializing infinite and NaN floating point properties in XML
+* Improved compatibility with XML models
+* Plugin should now be able to live-sync more properties, and ignore ones it can't, like `Lighting.Technology`.
+
+## 0.5.0 Alpha 10
+* This release was a dud due to [issue #176](https://github.com/rojo-rbx/rojo/issues/176) and was rolled back.
+
+## [0.5.0 Alpha 9](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.0-alpha.9) (April 4, 2019)
+* Changed `rojo build` to use buffered I/O, which can make it up to 2x faster in some cases.
+    * Building [*Road Not Taken*](https://github.com/rojo-rbx/roads) to an `rbxlx` file dropped from 150ms to 70ms on my machine
+* Fixed `LocalizationTable` instances being made from `csv` files incorrectly interpreting empty rows and columns. ([#149](https://github.com/rojo-rbx/rojo/pull/149))
+* Fixed CSV files with entries that parse as numbers causing Rojo to panic. ([#152](https://github.com/rojo-rbx/rojo/pull/152))
+* Improved error messages when malformed CSV files are found in a Rojo project.
+
+## [0.5.0 Alpha 8](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.0-alpha.8) (March 29, 2019)
+* Added support for a bunch of new types when dealing with XML model/place files:
+    * `ColorSequence`
+    * `Float64`
+    * `Int64`
+    * `NumberRange`
+    * `NumberSequence`
+    * `PhysicalProperties`
+    * `Ray`
+    * `Rect`
+    * `Ref`
+* Improved server instance ordering behavior when files are added during a live session ([#135](https://github.com/rojo-rbx/rojo/pull/135))
+* Fixed error being thrown when trying to unload the Rojo plugin.
+* Added partial fix for [issue #141](https://github.com/rojo-rbx/rojo/issues/141) for `Lighting.Technology`, which should restore live sync functionality for the default project file.
+
+## [0.5.0 Alpha 6](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.0-alpha.6) (March 19, 2019)
+* Fixed `rojo init` giving unexpected results by upgrading to `rbx_dom_weak` 1.1.0
+* Fixed live server not responding when the Rojo plugin is connected ([#133](https://github.com/rojo-rbx/rojo/issues/133))
+* Updated default place file:
+    * Improved default properties to be closer to Studio's built-in 'Baseplate' template
+    * Added a baseplate to the project file (Thanks, [@AmaranthineCodices](https://github.com/AmaranthineCodices/)!)
+* Added more type support to Rojo plugin
+* Fixed some cases where the Rojo plugin would leave around objects that it knows should be deleted
+* Updated plugin to correctly listen to `Plugin.Unloading` when installing or uninstalling new plugins
+
+## [0.5.0 Alpha 5](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.0-alpha.5) (March 1, 2019)
+* Upgraded core dependencies, which improves compatibility for lots of instance types
+    * Upgraded from `rbx_tree` 0.2.0 to `rbx_dom_weak` 1.0.0
+    * Upgraded from `rbx_xml` 0.2.0 to `rbx_xml` 0.4.0
+    * Upgraded from `rbx_binary` 0.2.0 to `rbx_binary` 0.4.0
+* Added support for non-primitive types in the Rojo plugin.
+    * Types like `Color3` and `CFrame` can now be updated live!
+* Fixed plugin assets flashing in on first load ([#121](https://github.com/rojo-rbx/rojo/issues/121))
+* Changed Rojo's HTTP server from Rouille to Hyper, which reduced the release size by around a megabyte.
+* Added property type inference to projects, which makes specifying services a lot easier ([#130](https://github.com/rojo-rbx/rojo/pull/130))
+* Made error messages from invalid and missing files more user-friendly
+
+## [0.5.0 Alpha 4](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.0-alpha.4) (February 8, 2019)
+* Added support for nested partitions ([#102](https://github.com/rojo-rbx/rojo/issues/102))
+* Added support for 'transmuting' partitions ([#112](https://github.com/rojo-rbx/rojo/issues/112))
+* Added support for aliasing filesystem paths ([#105](https://github.com/rojo-rbx/rojo/issues/105))
+* Changed Windows builds to statically link the CRT ([#89](https://github.com/rojo-rbx/rojo/issues/89))
+
+## [0.5.0 Alpha 3](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.0-alpha.3) (February 1, 2019)
+* Changed default project file name from `roblox-project.json` to `default.project.json` ([#120](https://github.com/rojo-rbx/rojo/pull/120))
+    * The old file name will still be supported until 0.5.0 is fully released.
+* Added warning when loading project files that don't end in `.project.json`
+    * This new extension enables Rojo to distinguish project files from random JSON files, which is necessary to support nested projects.
+* Added new (empty) diagnostic page served from the server
+* Added better error messages for when a file is missing that's referenced by a Rojo project
+* Added support for visualization endpoints returning GraphViz source when Dot is not available
+* Fixed an in-memory filesystem regression introduced recently ([#119](https://github.com/rojo-rbx/rojo/pull/119))
+
+## [0.5.0 Alpha 2](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.0-alpha.2) (January 28, 2019)
+* Added support for `.model.json` files, compatible with 0.4.x
+* Fixed in-memory filesystem not handling out-of-order filesystem change events
+* Fixed long-polling error caused by a promise mixup ([#110](https://github.com/rojo-rbx/rojo/issues/110))
+
+## [0.5.0 Alpha 1](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.0-alpha.1) (January 25, 2019)
+* Changed plugin UI to be way prettier
+    * Thanks to [Reselim](https://github.com/Reselim) for the design!
+* Changed plugin error messages to be a little more useful
+* Removed unused 'Config' button in plugin UI
+* Fixed bug where bad server responses could cause the plugin to be in a bad state
+* Upgraded to rbx\_tree, rbx\_xml, and rbx\_binary 0.2.0, which dramatically expands the kinds of properties that Rojo can handle, especially in XML.
+
+## [0.5.0 Alpha 0](https://github.com/rojo-rbx/rojo/releases/tag/v0.5.0-alpha.0) (January 14, 2019)
+* "Epiphany" rewrite, in progress since the beginning of time
+* New live sync protocol
+    * Uses HTTP long polling to reduce request count and improve responsiveness
+* New project format
+    * Hierarchical, preventing overlapping partitions
+* Added `rojo build` command
+    * Generates `rbxm`, `rbxmx`, `rbxl`, or `rbxlx` files out of your project
+    * Usage: `rojo build <PROJECT> --output <OUTPUT>.rbxm`
+* Added `rojo upload` command
+    * Generates and uploads a place or model to roblox.com out of your project
+    * Usage: `rojo upload <PROJECT> --cookie "<ROBLOSECURITY>" --asset_id <PLACE_ID>`
+* New plugin
+    * Only one button now, "Connect"
+    * New UI to pick server address and port
+    * Better error reporting
+* Added support for `.csv` files turning into `LocalizationTable` instances
+* Added support for `.txt` files turning into `StringValue` instances
+* Added debug visualization code to diagnose problems
+    * `/visualize/rbx` and `/visualize/imfs` show instance and file state respectively; they require GraphViz to be installed on your machine.
+* Added optional place ID restrictions to project files
+    * This helps prevent syncing in content to the wrong place
+    * Multiple places can be specified, like when building a multi-place game
+* Added support for specifying properties on services in project files
+
+## [0.4.13](https://github.com/rojo-rbx/rojo/releases/tag/v0.4.13) (November 12, 2018)
+* When `rojo.json` points to a file or directory that does not exist, Rojo now issues a warning instead of throwing an error and exiting
+
+## [0.4.12](https://github.com/rojo-rbx/rojo/releases/tag/v0.4.12) (June 21, 2018)
+* Fixed obscure assertion failure when renaming or deleting files ([#78](https://github.com/rojo-rbx/rojo/issues/78))
+* Added a `PluginAction` for the sync in command, which should help with some automation scripts ([#80](https://github.com/rojo-rbx/rojo/pull/80))
+
+## [0.4.11](https://github.com/rojo-rbx/rojo/releases/tag/v0.4.11) (June 10, 2018)
+* Defensively insert existing instances into RouteMap; should fix most duplication cases when syncing into existing trees.
+* Fixed incorrect synchronization from `Plugin:_pull` that would cause polling to create issues
+* Fixed incorrect file routes being assigned to `init.lua` and `init.model.json` files
+* Untangled route handling-internals slightly
+
+## [0.4.10](https://github.com/rojo-rbx/rojo/releases/tag/v0.4.10) (June 2, 2018)
+* Added support for `init.model.json` files, which enable versioning `Tool` instances (among other things) with Rojo. ([#66](https://github.com/rojo-rbx/rojo/issues/66))
+* Fixed obscure error when syncing into an invalid service.
+* Fixed multiple sync processes occurring when a server ID mismatch is detected.
+
+## [0.4.9](https://github.com/rojo-rbx/rojo/releases/tag/v0.4.9) (May 26, 2018)
+* Fixed warning when renaming or removing files that would sometimes corrupt the instance cache ([#72](https://github.com/rojo-rbx/rojo/pull/72))
+* JSON models are no longer as strict -- `Children` and `Properties` are now optional.
+
+## [0.4.8](https://github.com/rojo-rbx/rojo/releases/tag/v0.4.8) (May 26, 2018)
+* Hotfix to prevent errors from being thrown when objects managed by Rojo are deleted
+
+## [0.4.7](https://github.com/rojo-rbx/rojo/releases/tag/v0.4.7) (May 25, 2018)
+* Added icons to the Rojo plugin, made by [@Vorlias](https://github.com/Vorlias)! ([#70](https://github.com/rojo-rbx/rojo/pull/70))
+* Server will now issue a warning if no partitions are specified in `rojo serve` ([#40](https://github.com/rojo-rbx/rojo/issues/40))
+
+## [0.4.6](https://github.com/rojo-rbx/rojo/releases/tag/v0.4.6) (May 21, 2018)
+* Rojo handles being restarted by Roblox Studio more gracefully ([#67](https://github.com/rojo-rbx/rojo/issues/67))
+* Folders should no longer get collapsed when syncing occurs.
+* **Significant** robustness improvements with regards to caching.
+    * **This should catch all existing script duplication bugs.**
+    * If there are any bugs with script duplication or caching in the future, restarting the Rojo server process will fix them for that session.
+* Fixed message in plugin not being prefixed with `Rojo: `.
+
+## [0.4.5](https://github.com/rojo-rbx/rojo/releases/tag/v0.4.5) (May 1, 2018)
+* Rojo messages are now prefixed with `Rojo: ` to make them stand out in the output more.
+* Fixed server to notice file changes *much* more quickly. (200ms vs 1000ms)
+* Server now lists name of project when starting up.
+* Rojo now throws an error if no project file is found. ([#63](https://github.com/rojo-rbx/rojo/issues/63))
+* Fixed multiple sync operations occuring at the same time. ([#61](https://github.com/rojo-rbx/rojo/issues/61))
+* Partitions targeting files directly now work as expected. ([#57](https://github.com/rojo-rbx/rojo/issues/57))
+
+## [0.4.4](https://github.com/rojo-rbx/rojo/releases/tag/v0.4.4) (April 7, 2018)
+* Fix small regression introduced in 0.4.3
+
+## [0.4.3](https://github.com/rojo-rbx/rojo/releases/tag/v0.4.3) (April 7, 2018)
+* Plugin now automatically selects `HttpService` if it determines that HTTP isn't enabled ([#58](https://github.com/rojo-rbx/rojo/pull/58))
+* Plugin now has much more robust handling and will wipe all state when the server changes.
+    * This should fix issues that would otherwise be solved by restarting Roblox Studio.
+
+## [0.4.2](https://github.com/rojo-rbx/rojo/releases/tag/v0.4.2) (April 4, 2018)
+* Fixed final case of duplicated instance insertion, caused by reconciled instances not being inserted into `RouteMap`.
+    * The reconciler is still not a perfect solution, especially if script instances get moved around without being destroyed. I don't think this can be fixed before a big refactor.
+
+## [0.4.1](https://github.com/rojo-rbx/rojo/releases/tag/v0.4.1) (April 1, 2018)
+* Merged plugin repository into main Rojo repository for easier tracking.
+* Improved `RouteMap` object tracking; this should fix some cases of duplicated instances being synced into the tree.
+
+## [0.4.0](https://github.com/rojo-rbx/rojo/releases/tag/v0.4.0) (March 27, 2018)
+* Protocol version 1, which shifts more responsibility onto the server
+    * This is a **major breaking** change!
+    * The server now has a content of 'filter plugins', which transform data at various stages in the pipeline
+    * The server now exposes Roblox instance objects instead of file contents, which lines up with how `rojo pack` will work, and paves the way for more robust syncing.
+* Added `*.model.json` files, which let you embed small Roblox objects into your Rojo tree.
+* Improved error messages in some cases ([#46](https://github.com/rojo-rbx/rojo/issues/46))
+
+## [0.3.2](https://github.com/rojo-rbx/rojo/releases/tag/v0.3.2) (December 20, 2017)
+* Fixed `rojo serve` failing to correctly construct an absolute root path when passed as an argument
+* Fixed intense CPU usage when running `rojo serve`
+
+## [0.3.1](https://github.com/rojo-rbx/rojo/releases/tag/v0.3.1) (December 14, 2017)
+* Improved error reporting when invalid JSON is found in a `rojo.json` project
+    * These messages are passed on from Serde
+
+## [0.3.0](https://github.com/rojo-rbx/rojo/releases/tag/v0.3.0) (December 12, 2017)
+* Factored out the plugin into a separate repository
+* Fixed server when using a file as a partition
+    * Previously, trailing slashes were put on the end of a partition even if the read request was an empty string. This broke file reading on Windows when a partition pointed to a file instead of a directory!
+* Started running automatic tests on Travis CI (#9)
+
+## [0.2.3](https://github.com/rojo-rbx/rojo/releases/tag/v0.2.3) (December 4, 2017)
+* Plugin only release
+* Tightened `init` file rules to only match script files
+    * Previously, Rojo would sometimes pick up the wrong file when syncing
+
+## [0.2.2](https://github.com/rojo-rbx/rojo/releases/tag/v0.2.2) (December 1, 2017)
+* Plugin only release
+* Fixed broken reconciliation behavior with `init` files
+
+## [0.2.1](https://github.com/rojo-rbx/rojo/releases/tag/v0.2.1) (December 1, 2017)
+* Plugin only release
+* Changes default port to 8000
+
+## [0.2.0](https://github.com/rojo-rbx/rojo/releases/tag/v0.2.0) (December 1, 2017)
+* Support for `init.lua` like rbxfs and rbxpacker
+* More robust syncing with a new reconciler
+
+## [0.1.0](https://github.com/rojo-rbx/rojo/releases/tag/v0.1.0) (November 29, 2017)
+* Initial release, functionally very similar to [rbxfs](https://github.com/rojo-rbx/rbxfs)

CHANGES.md

@@ -1,85 +0,0 @@
-# Rojo Change Log
-
-## Current master
-* *No changes*
-
-## 0.4.8 (May 26, 2018)
-* Hotfix to prevent errors from being thrown when objects managed by Rojo are deleted
-
-## 0.4.7 (May 25, 2018)
-* Added icons to the Rojo plugin, made by [@Vorlias](https://github.com/Vorlias)! ([#70](https://github.com/LPGhatguy/rojo/pull/70))
-* Server will now issue a warning if no partitions are specified in `rojo serve` ([#40](https://github.com/LPGhatguy/rojo/issues/40))
-
-## 0.4.6 (May 21, 2018)
-* Rojo handles being restarted by Roblox Studio more gracefully ([#67](https://github.com/LPGhatguy/rojo/issues/67))
-* Folders should no longer get collapsed when syncing occurs.
-* **Significant** robustness improvements with regards to caching.
-    * **This should catch all existing script duplication bugs.**
-    * If there are any bugs with script duplication or caching in the future, restarting the Rojo server process will fix them for that session.
-* Fixed message in plugin not being prefixed with `Rojo: `.
-
-## 0.4.5 (May 1, 2018)
-* Rojo messages are now prefixed with `Rojo: ` to make them stand out in the output more.
-* Fixed server to notice file changes *much* more quickly. (200ms vs 1000ms)
-* Server now lists name of project when starting up.
-* Rojo now throws an error if no project file is found. ([#63](https://github.com/LPGhatguy/rojo/issues/63))
-* Fixed multiple sync operations occuring at the same time. ([#61](https://github.com/LPGhatguy/rojo/issues/61))
-* Partitions targeting files directly now work as expected. ([#57](https://github.com/LPGhatguy/rojo/issues/57))
-
-## 0.4.4 (April 7, 2018)
-* Fix small regression introduced in 0.4.3
-
-## 0.4.3 (April 7, 2018)
-* Plugin now automatically selects `HttpService` if it determines that HTTP isn't enabled ([#58](https://github.com/LPGhatguy/rojo/pull/58))
-* Plugin now has much more robust handling and will wipe all state when the server changes.
-	* This should fix issues that would otherwise be solved by restarting Roblox Studio.
-
-## 0.4.2 (April 4, 2018)
-* Fixed final case of duplicated instance insertion, caused by reconciled instances not being inserted into `RouteMap`.
-	* The reconciler is still not a perfect solution, especially if script instances get moved around without being destroyed. I don't think this can be fixed before a big refactor.
-
-## 0.4.1 (April 1, 2018)
-* Merged plugin repository into main Rojo repository for easier tracking.
-* Improved `RouteMap` object tracking; this should fix some cases of duplicated instances being synced into the tree.
-
-## 0.4.0 (March 27, 2018)
-* Protocol version 1, which shifts more responsibility onto the server
-	* This is a **major breaking** change!
-	* The server now has a content of 'filter plugins', which transform data at various stages in the pipeline
-	* The server now exposes Roblox instance objects instead of file contents, which lines up with how `rojo pack` will work, and paves the way for more robust syncing.
-* Added `*.model.json` files, which let you embed small Roblox objects into your Rojo tree.
-* Improved error messages in some cases ([#46](https://github.com/LPGhatguy/rojo/issues/46))
-
-## 0.3.2 (December 20, 2017)
-* Fixed `rojo serve` failing to correctly construct an absolute root path when passed as an argument
-* Fixed intense CPU usage when running `rojo serve`
-
-## 0.3.1 (December 14, 2017)
-* Improved error reporting when invalid JSON is found in a `rojo.json` project
-	* These messages are passed on from Serde
-
-## 0.3.0 (December 12, 2017)
-* Factored out the plugin into a separate repository
-* Fixed server when using a file as a partition
-	* Previously, trailing slashes were put on the end of a partition even if the read request was an empty string. This broke file reading on Windows when a partition pointed to a file instead of a directory!
-* Started running automatic tests on Travis CI (#9)
-
-## 0.2.3 (December 4, 2017)
-* Plugin only release
-* Tightened `init` file rules to only match script files
-	* Previously, Rojo would sometimes pick up the wrong file when syncing
-
-## 0.2.2 (December 1, 2017)
-* Plugin only release
-* Fixed broken reconciliation behavior with `init` files
-
-## 0.2.1 (December 1, 2017)
-* Plugin only release
-* Changes default port to 8000
-
-## 0.2.0 (December 1, 2017)
-* Support for `init.lua` like rbxfs and rbxpacker
-* More robust syncing with a new reconciler
-
-## 0.1.0 (November 29, 2017)
-* Initial release, functionally very similar to [rbxfs](https://github.com/LPGhatguy/rbxfs)

CONTRIBUTING.md

@@ -0,0 +1,55 @@
+# Contributing to the Rojo Project
+Rojo is a big project and can always use more help! This guide covers all repositories underneath the [rojo-rbx organization on GitHub](https://github.com/rojo-rbx).
+
+Some of the repositories covered are:
+
+* https://github.com/rojo-rbx/rojo
+* https://github.com/rojo-rbx/rbx-dom
+* https://github.com/rojo-rbx/vscode-rojo
+* https://github.com/rojo-rbx/rbxlx-to-rojo
+
+## Code
+Code contributions are welcome for features and bugs that have been reported in the project's bug tracker. We want to make sure that no one wastes their time, so be sure to talk with maintainers about what changes would be accepted before doing any work!
+
+You'll want these tools to work on Rojo:
+
+* Latest stable Rust compiler
+* Latest stable [Rojo](https://github.com/rojo-rbx/rojo)
+* Latest stable [Remodel](https://github.com/rojo-rbx/remodel)
+* Latest stable [run-in-roblox](https://github.com/rojo-rbx/run-in-roblox)
+
+## Documentation
+Documentation impacts way more people than the individual lines of code we write.
+
+If you find any problems in documentation, including typos, bad grammar, misleading phrasing, or missing content, feel free to file issues and pull requests to fix them.
+
+## Bug Reports and Feature Requests
+Most of the tools around Rojo try to be clear when an issue is a bug. Even if they aren't, sometimes things don't work quite right.
+
+Sometimes there's something that Rojo doesn't do that it probably should.
+
+Please file issues and we'll try to help figure out what the best way forward is.
+
+## Pushing a Rojo Release
+The Rojo release process is pretty manual right now. If you need to do it, here's how:
+
+1. Bump server version in [`server/Cargo.toml`](server/Cargo.toml)
+2. Bump plugin version in [`plugin/src/Config.lua`](plugin/src/Config.lua)
+3. Run `cargo test` to update `Cargo.lock` and double-check tests
+4. Update [`CHANGELOG.md`](CHANGELOG.md)
+5. Commit!
+    * `git add . && git commit -m "Release vX.Y.Z"`
+6. Tag the commit with the version from `Cargo.toml` prepended with a v, like `v0.4.13`
+7. Build Windows release build of CLI
+    * `cargo build --release`
+7. Publish the CLI
+    * `cargo publish`
+8. Build and upload the plugin
+    * `rojo build plugin -o Rojo.rbxm`
+    * Upload `Rojo.rbxm` to Roblox.com, keep it for later
+9. Push commits and tags
+    * `git push && git push --tags`
+10. Copy GitHub release content from previous release
+    * Update the leading text with a summary about the release
+    * Paste the changelog notes (as-is!) from [`CHANGELOG.md`](CHANGELOG.md)
+    * Write a small summary of each major feature

Cargo.toml

@@ -0,0 +1,99 @@
+[package]
+name = "rojo"
+version = "0.6.0-alpha.2"
+authors = ["Lucien Greathouse <me@lpghatguy.com>"]
+description = "Enables professional-grade development tools for Roblox developers"
+license = "MPL-2.0"
+homepage = "https://rojo.space"
+documentation = "https://rojo.space/docs"
+repository = "https://github.com/rojo-rbx/rojo"
+readme = "README.md"
+edition = "2018"
+
+exclude = [
+    "/plugin/**",
+    "/test-projects/**",
+]
+
+[features]
+default = []
+
+# Turn on support for specifying glob ignore path rules in the project format.
+unstable_glob_ignore_paths = []
+
+# Turn on the server half of Rojo's unstable two-way sync feature.
+unstable_two_way_sync = []
+
+# Enable this feature to live-reload assets from the web UI.
+dev_live_assets = []
+
+[workspace]
+members = [
+    "rojo-test",
+    "rojo-insta-ext",
+    "clibrojo",
+    "vfs",
+]
+
+default-members = [
+    ".",
+    "rojo-test",
+    "rojo-insta-ext",
+    "vfs",
+]
+
+[lib]
+name = "librojo"
+path = "src/lib.rs"
+
+[[bin]]
+name = "rojo"
+path = "src/bin.rs"
+
+[[bench]]
+name = "build"
+harness = false
+
+[dependencies]
+crossbeam-channel = "0.4.0"
+csv = "1.1.1"
+env_logger = "0.7.1"
+futures = "0.1.29"
+globset = "0.4.4"
+humantime = "1.3.0"
+hyper = "0.12.35"
+jod-thread = "0.1.0"
+lazy_static = "1.4.0"
+log = "0.4.8"
+maplit = "1.0.1"
+notify = "4.0.14"
+rbx_binary = "0.5.0"
+rbx_dom_weak = "1.10.1"
+rbx_reflection = "3.3.408"
+rbx_xml = "0.11.3"
+regex = "1.3.1"
+reqwest = "0.9.20"
+ritz = "0.1.0"
+rlua = "0.17.0"
+serde = { version = "1.0", features = ["derive", "rc"] }
+serde_json = "1.0"
+snafu = "0.6.0"
+structopt = "0.3.5"
+termcolor = "1.0.5"
+uuid = { version = "0.8.1", features = ["v4", "serde"] }
+
+[target.'cfg(windows)'.dependencies]
+winreg = "0.6.2"
+
+[dev-dependencies]
+rojo-insta-ext = { path = "rojo-insta-ext" }
+
+criterion = "0.3"
+insta = { version = "0.13.1", features = ["redactions"] }
+lazy_static = "1.2"
+paste = "0.1"
+pretty_assertions = "0.6.1"
+serde_yaml = "0.8.9"
+tempfile = "3.0"
+tokio = "0.1.22"
+walkdir = "2.1"

DESIGN.md

@@ -1,49 +0,0 @@
-# Rojo Design - Protocol Version 1
-This is a super rough draft that I'm trying to use to lay out some of my thoughts.
-
-## API
-
-### POST `/read`
-Accepts a `Vec<Route>` of items to read.
-
-Returns `Vec<Option<RbxInstance>>`, in the same order as the request.
-
-### POST `/write`
-Accepts a `Vec<{ Route, RbxInstance }>` of items to write.
-
-I imagine that the `Name` attribute of the top-level `RbxInstance` would be ignored in favor of the route name?
-
-## CLI
-The `rojo serve` command uses three major components:
-* A Virtual Filesystem (VFS), which exposes the filesystem as `VfsItem` objects
-* A VFS watcher, which tracks changes to the filesystem and logs them
-* An HTTP API, which exposes an interface to the Roblox Studio plugin
-
-### Transform Plugins
-Transform plugins (or filter plugins?) can interject in three places:
-* Transform a `VfsItem` that's being read into an `RbxInstance` in the VFS
-* Transform an `RbxInstance` that's being written into a `VfsItem` in the VFS
-* Transform a file change into paths that need to be updated in the VFS watcher
-
-The plan is to have several built-in plugins that can be rearranged/configured in project settings:
-
-* Base plugin
-	* Transforms all unhandled files to/from StringValue objects
-* Script plugin
-	* Transforms `*.lua` files to their appropriate file types
-* JSON/rbxmx/rbxlx model plugin
-* External binary plugin
-	* User passes a binary name (like `moonc`) that modifies file contents
-
-## Roblox Studio Plugin
-With the protocol version 1 change, the Roblox Studio plugin got a lot simpler. Notably, the plugin doesn't need to be aware of anything about the filesystem's semantics, which is super handy.
-
-## Bi-directional syncing
-Quenty laid out a good way to handle bi-directional syncing.
-
-When receiving a change from the plugin:
-1. Hash the new contents of the file, store it in a map from routes to hashes
-2. Write the new file contents to the filesystem
-3. Later down the line, receive a change event from the filesystem watcher
-4. When receiving a change, if the item is in the hash map, read it and hash those contents
-5. If the hash matches the last noted hash, discard the change, else continue as normal

README.md

@@ -1,60 +1,55 @@
 <div align="center">
-    <img src="assets/rojo-logo.png" alt="Rojo" height="217" />
+    <a href="https://rojo.space">
+        <img src="assets/logo-512.png" alt="Rojo" height="217" />
+    </a>
 </div>
 
 <div>&nbsp;</div>
 
 <div align="center">
-    <a href="https://travis-ci.org/LPGhatguy/rojo">
-        <img src="https://api.travis-ci.org/LPGhatguy/rojo.svg?branch=master" alt="Travis-CI Build Status" />
+    <a href="https://github.com/rojo-rbx/rojo/actions">
+        <img src="https://github.com/rojo-rbx/rojo/workflows/CI/badge.svg" alt="Actions status" />
     </a>
-    <img src="https://img.shields.io/badge/latest_version-0.4.8-brightgreen.svg" alt="Current server version" />
-    <a href="https://lpghatguy.github.io/rojo">
-        <img src="https://img.shields.io/badge/documentation-website-brightgreen.svg" alt="Rojo Documentation" />
+    <a href="https://crates.io/crates/rojo">
+        <img src="https://img.shields.io/crates/v/rojo.svg?label=latest%20release" alt="Latest server version" />
+    </a>
+    <a href="https://rojo.space/docs/0.5.x">
+        <img src="https://img.shields.io/badge/docs-0.5.x-brightgreen.svg" alt="Rojo 0.5.x Documentation" />
     </a>
 </div>
 
 <hr />
 
-**Rojo** is a flexible multi-tool designed for creating robust Roblox projects.
+**Rojo** is a tool designed to enable Roblox developers to use professional-grade software engineering tools.
 
-It's designed for power users who want to use the **best tools available** for building games, libraries, and plugins.
+With Rojo, it's possible to use industry-leading tools like **Visual Studio Code** and **Git**.
+
+Rojo is designed for power users who want to use the best tools available for building games, libraries, and plugins.
 
 ## Features
-Rojo lets you:
+Rojo enables:
 
-* Work on scripts from the filesystem, in your favorite editor
-* Version your place, library, or plugin using Git or another VCS
-* Sync JSON-format models from the filesystem into your game
+* Working on scripts and models from the filesystem, in your favorite editor
+* Versioning your game, library, or plugin using Git or another VCS
+* Streaming `rbxmx` and `rbxm` models into your game in real time
+* Packaging and deploying your project to Roblox.com from the command line
 
-Later this year, Rojo will be able to:
+Soon, Rojo will be able to:
 
-* Sync `rbxmx` models between the filesystem and Roblox Studio
-* Package projects into `rbxmx` files from the command line
+* Automatically convert your existing game to work with Rojo
+* Sync instances from Roblox Studio to the filesystem
+* Automatically manage your assets on Roblox.com, like images and sounds
+* Import custom instances like MoonScript code
 
-## [Documentation Website](https://lpghatguy.github.io/rojo)
-You can also view the documentation by browsing the [docs folder of the repository](https://github.com/LPGhatguy/rojo/tree/master/docs), but because it uses a number of Markdown extensions, it may not be very readable.
-
-## Inspiration
-There are lots of other tools that sync scripts into Roblox or provide other tools for working with Roblox places.
-
-Here are a few, if you're looking for alternatives or supplements to Rojo:
-
-* [Studio Bridge by Vocksel](https://github.com/vocksel/studio-bridge)
-* [RbxRefresh by Osyris](https://github.com/osyrisrblx/RbxRefresh)
-* [RbxSync by evaera](https://github.com/evaera/RbxSync)
-* [CodeSync](https://github.com/MemoryPenguin/CodeSync) and [rbx-exteditor](https://github.com/MemoryPenguin/rbx-exteditor) by [MemoryPenguin](https://github.com/MemoryPenguin)
-* [rbxmk by Anaminus](https://github.com/anaminus/rbxmk)
-
-I also have a couple tools that Rojo intends to replace:
-
-* [rbxfs](https://github.com/LPGhatguy/rbxfs), which has been deprecated by Rojo
-* [rbxpacker](https://github.com/LPGhatguy/rbxpacker), which is still useful
+## [Documentation](https://rojo.space/docs)
+Documentation is hosted in the [rojo.space repository](https://github.com/rojo-rbx/rojo.space).
 
 ## Contributing
+Check out our [contribution guide](CONTRIBUTING.md) for detailed instructions for helping work on Rojo!
+
 Pull requests are welcome!
 
-All pull requests are run against a test suite on Travis CI. That test suite should always pass!
+Rojo supports Rust 1.40.0 and newer. The minimum supported version of Rust is based on the latest versions of the dependencies that Rojo has.
 
 ## License
-Rojo is available under the terms of the Mozilla Public License, Version 2.0. See [LICENSE](LICENSE) for details.
+Rojo is available under the terms of the Mozilla Public License, Version 2.0. See [LICENSE.txt](LICENSE.txt) for details.

assets/index.css

@@ -0,0 +1,181 @@
+* {
+  margin: 0;
+  padding: 0;
+  border: none;
+  text-decoration: inherit;
+  color: inherit;
+  font: inherit;
+  box-sizing: inherit;
+  line-height: inherit;
+}
+
+html {
+  box-sizing: border-box;
+  font-family: sans-serif;
+  font-size: 18px;
+  text-decoration: none;
+  line-height: 1.4;
+}
+
+img {
+  max-width:100%;
+  max-height:100%;
+  height: auto;
+}
+
+.path-list > li {
+  margin-left: 1.2em;
+  font-family: monospace;
+}
+
+.root {
+  display: flex;
+  flex-direction: column;
+  margin: 0.5rem auto;
+  width: 100%;
+  max-width: 50rem;
+  background-color: #efefef;
+  border: 1px solid #666;
+  border-radius: 4px;
+}
+
+.header {
+  flex: 0 0;
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  border-bottom: 1px solid #666;
+}
+
+.main {
+  padding: 1rem;
+}
+
+.main-logo {
+  flex: 0 0 10rem;
+  margin: 1rem;
+}
+
+.stats {
+  flex: 0 0 20rem;
+  margin: 1rem;
+}
+
+.stat {
+  display: block;
+}
+
+.stat-name {
+  display: inline;
+  font-weight: bold;
+}
+
+.main-section:not(:last-of-type) {
+  margin-bottom: 1rem;
+}
+
+.section-title {
+  font-size: 1.8rem;
+}
+
+.button-list {
+  flex: 0 0;
+  display: flex;
+  flex-wrap: wrap;
+  justify-content: space-around;
+  margin: -1rem;
+}
+
+.button {
+  display: inline-block;
+  border: 1px solid #666;
+  padding: 0.3em 1em;
+  margin: 1rem;
+}
+
+.instance {
+  margin-bottom: 0.5rem;
+}
+
+.instance-title {
+  font-size: 1.2rem;
+  padding: 0.5rem;
+}
+
+.expandable-section {
+  margin: 0.25rem 0.5rem;
+}
+
+.expandable-items {
+  padding: 0.5rem 1rem;
+}
+
+.expandable-input {
+  display: none;
+}
+
+.expandable-label > label {
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  align-content: center;
+}
+
+.expandable-input ~ .expandable-label .expandable-visualizer {
+  font-family: monospace;
+  display: inline-flex;
+  align-items: center;
+  align-content: center;
+  text-align: center;
+  width: 1rem;
+  height: 1rem;
+  font-size: 2rem;
+  margin: 0 0.5rem;
+  transition: transform 100ms ease-in-out;
+  transform-origin: 60% 60%;
+}
+
+.expandable-visualizer::before {
+  content: "›";
+  font-weight: bold;
+}
+
+.expandable-input:checked ~ .expandable-label {
+  border-bottom: 1px solid #bbb;
+}
+
+.expandable-input:checked ~ .expandable-label .expandable-visualizer {
+  transform: rotate(90deg);
+}
+
+.expandable-input:not(:checked) ~ .expandable-items {
+  display: none;
+}
+
+.vfs-entry {
+}
+
+.vfs-entry-name {
+  position: relative;
+  font-family: monospace;
+}
+
+.vfs-entry-children .vfs-entry-name::before {
+  content: "";
+  width: 0.6em;
+  height: 1px;
+  background-color: #999;
+  position: absolute;
+  top: 50%;
+  left: -0.8em;
+}
+
+.vfs-entry-note {
+  font-style: italic;
+}
+
+.vfs-entry-children {
+  padding-left: 0.8em;
+  margin-left: 0.2em;
+  border-left: 1px solid #999;
+}

assets/place.project.json

@@ -0,0 +1,66 @@
+{
+  "name": "[placeholder]",
+  "tree": {
+    "$className": "DataModel",
+    "HttpService": {
+      "$className": "HttpService",
+      "$properties": {
+        "HttpEnabled": true
+      }
+    },
+    "Lighting": {
+      "$className": "Lighting",
+      "$properties": {
+        "Ambient": [
+          0,
+          0,
+          0
+        ],
+        "Brightness": 2,
+        "GlobalShadows": true,
+        "Outlines": false,
+        "Technology": "Voxel"
+      }
+    },
+    "ReplicatedStorage": {
+      "$className": "ReplicatedStorage",
+      "Source": {
+        "$path": "src"
+      }
+    },
+    "SoundService": {
+      "$className": "SoundService",
+      "$properties": {
+        "RespectFilteringEnabled": true
+      }
+    },
+    "Workspace": {
+      "$className": "Workspace",
+      "$properties": {
+        "FilteringEnabled": true
+      },
+      "Baseplate": {
+        "$className": "Part",
+        "$properties": {
+          "Anchored": true,
+          "Color": [
+            0.38823,
+            0.37254,
+            0.38823
+          ],
+          "Locked": true,
+          "Position": [
+            0,
+            -10,
+            0
+          ],
+          "Size": [
+            512,
+            20,
+            512
+          ]
+        }
+      }
+    }
+  }
+}

benches/build.rs

@@ -0,0 +1,42 @@
+use std::path::Path;
+
+use criterion::{criterion_group, criterion_main, BatchSize, Criterion};
+use tempfile::{tempdir, TempDir};
+
+use librojo::cli::{build, BuildCommand};
+
+pub fn benchmark_small_place(c: &mut Criterion) {
+    bench_build_place(c, "Small Place", "test-projects/benchmark_small_place")
+}
+
+criterion_group!(benches, benchmark_small_place);
+criterion_main!(benches);
+
+fn bench_build_place(c: &mut Criterion, name: &str, path: &str) {
+    let mut group = c.benchmark_group(name);
+
+    // 'rojo build' generally takes a fair bit of time to execute.
+    group.sample_size(10);
+    group.bench_function("build", |b| {
+        b.iter_batched(
+            || place_setup(path),
+            |(_dir, options)| build(options).unwrap(),
+            BatchSize::SmallInput,
+        )
+    });
+
+    group.finish();
+}
+
+fn place_setup<P: AsRef<Path>>(input_path: P) -> (TempDir, BuildCommand) {
+    let dir = tempdir().unwrap();
+    let input = input_path.as_ref().to_path_buf();
+    let output = dir.path().join("output.rbxlx");
+
+    let options = BuildCommand {
+        project: input,
+        output,
+    };
+
+    (dir, options)
+}

bin/dev-plugin.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+set -e
+
+watchexec -c -w plugin "sh -c './bin/install-dev-plugin.sh'"

bin/install-dev-plugin.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+set -e
+
+DIR="$( mktemp -d )"
+PLUGIN_FILE="$DIR/Rojo.rbxm"
+TESTEZ_FILE="$DIR/TestEZ.rbxm"
+
+rojo build plugin -o "$PLUGIN_FILE"
+rojo build plugin/testez.project.json -o "$TESTEZ_FILE"
+remodel bin/mark-plugin-as-dev.lua "$PLUGIN_FILE" "$TESTEZ_FILE" 2>/dev/null
+
+cp "$PLUGIN_FILE" "$LOCALAPPDATA/Roblox/Plugins/Rojo.rbxm"

bin/install-release-plugin.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+set -e
+
+rojo build plugin -o "$LOCALAPPDATA/Roblox/Plugins/Rojo.rbxm"

bin/mark-plugin-as-dev.lua

@@ -0,0 +1,12 @@
+local pluginPath, testezPath = ...
+
+local plugin = remodel.readModelFile(pluginPath)[1]
+local testez = remodel.readModelFile(testezPath)[1]
+
+local marker = Instance.new("Folder")
+marker.Name = "ROJO_DEV_BUILD"
+marker.Parent = plugin
+
+testez.Parent = plugin
+
+remodel.writeModelFile(plugin, pluginPath)

bin/put-plugin-in-test-place.lua

@@ -0,0 +1,8 @@
+local pluginPath, placePath = ...
+
+local plugin = remodel.readModelFile(pluginPath)[1]
+local place = remodel.readPlaceFile(placePath)
+
+plugin.Parent = place:GetService("ReplicatedStorage")
+
+remodel.writePlaceFile(place, placePath)

bin/run-all-tests.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+set -e
+
+./bin/run-cli-tests.sh
+./bin/run-plugin-tests.sh

bin/run-cli-tests.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+set -e
+
+cargo test --all --locked
+cargo fmt -- --check
+
+touch src/lib.rs # Nudge Rust source to make Clippy actually check things
+cargo clippy

bin/run-plugin-tests.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+set -e
+
+DIR="$( mktemp -d )"
+PLUGIN_FILE="$DIR/Rojo.rbxmx"
+PLACE_FILE="$DIR/RojoTestPlace.rbxlx"
+
+rojo build plugin -o "$PLUGIN_FILE"
+rojo build plugin/place.project.json -o "$PLACE_FILE"
+
+remodel bin/put-plugin-in-test-place.lua "$PLUGIN_FILE" "$PLACE_FILE"
+
+run-in-roblox -s plugin/testBootstrap.server.lua "$PLACE_FILE"
+
+luacheck plugin/src plugin/log plugin/http

clibrojo/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "clibrojo"
+version = "0.1.0"
+authors = ["Lucien Greathouse <me@lpghatguy.com>"]
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib"]
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rojo = { path = ".." }

clibrojo/README.md

@@ -0,0 +1,19 @@
+# Rojo as a C Library
+This is an experiment to expose a C API for Rojo that would be suitable for embedding it into an existing C/C++ application.
+
+I'm hoping to expand it to drop the HTTP layer and communicate through a channel, which could make it feasible to embed into an existing Roblox IDE with minimal changes or additional code.
+
+## Building
+This project is currently not built by default and could break/disappear at any time.
+
+```bash
+cargo build -p clibrojo
+```
+
+On Windows, Cargo will generate a `clibrojo.dll` and associated `.lib` file. Link these into your project.
+
+To generate the associated C header file to include in the project, use [cbindgen](https://github.com/eqrion/cbindgen):
+
+```bash
+cbindgen --crate clibrojo --output include/rojo.h
+```

clibrojo/src/lib.rs

@@ -0,0 +1,14 @@
+use std::{ffi::CStr, os::raw::c_char, path::PathBuf};
+
+use librojo::commands::{serve, ServeOptions};
+
+#[no_mangle]
+pub extern "C" fn rojo_serve(path: *const c_char) {
+    let path = unsafe { PathBuf::from(CStr::from_ptr(path).to_str().unwrap()) };
+
+    serve(&ServeOptions {
+        fuzzy_project_path: path,
+        port: None,
+    })
+    .unwrap();
+}

design.gv

@@ -0,0 +1,30 @@
+digraph Rojo {
+	concentrate = true;
+	node [fontname = "sans-serif"];
+
+	plugin [label="Roblox Studio Plugin"]
+	session [label="Session"]
+	rbx_tree [label="Instance Tree"]
+	imfs [label="In-Memory Filesystem"]
+	fs_impl [label="Filesystem Implementation\n(stubbed in tests)"]
+	fs [label="Real Filesystem"]
+	snapshot_subsystem [label="Snapshot Subsystem\n(reconciler)"]
+	snapshot_generator [label="Snapshot Generator"]
+	user_middleware [label="User Middleware\n(MoonScript, etc.)"]
+	builtin_middleware [label="Built-in Middleware\n(.lua, .rbxm, etc.)"]
+	api [label="Web API"]
+	file_watcher [label="File Watcher"]
+
+	session -> imfs
+	session -> rbx_tree
+	session -> snapshot_subsystem
+	session -> snapshot_generator
+	session -> file_watcher [dir="both"]
+	file_watcher -> imfs
+	snapshot_generator -> user_middleware
+	snapshot_generator -> builtin_middleware
+	plugin -> api [style="dotted"; dir="both"; minlen=2]
+	api -> session
+	imfs -> fs_impl
+	fs_impl -> fs
+}

docs/getting-started/creating-a-project.md

@@ -1,77 +0,0 @@
-# Creating a Project
-To use Rojo, you'll need to create a new project file, which tells Rojo what your project is, and how to load it into Roblox Studio.
-
-## New Project
-Create a new folder, then run `rojo init` inside that folder to initialize an empty project.
-
-```sh
-mkdir my-new-project
-cd my-new-project
-
-rojo init
-```
-
-Rojo will create an empty project file named `rojo.json` in the directory.
-
-The default configuration doesn't do anything. We need to tell Rojo where our code is on the filesystem, and where we want to put it in the Roblox tree.
-
-To do that, open up `rojo.json` and add an entry to the `partitions` table:
-
-```json
-{
-    "name": "your-project-name-here",
-    "servePort": 8000,
-    "partitions": {
-        "src": {
-            "path": "src",
-            "target": "ReplicatedStorage.Project"
-        }
-    }
-}
-```
-
-!!! warning
-    Make sure that the `src` directory exists in your project, or Rojo will throw an error!
-
-!!! warning
-    Any objects contained in the `target` of a partition will be destroyed by Rojo if not found on the filesystem!
-
-A Rojo project has one or more *partitions*. Partitions define how code should be transferred between the filesystem and Roblox by mapping directories and files to Roblox objects.
-
-Each partition has:
-
-* A name (the key in the `partitions` object), which is used for debugging
-* `path`, the location on the filesystem relative to `rojo.json`
-* `target`, the location in Roblox relative to `game`
-
-## Syncing into Studio
-
-Once you've added your partition to the project file, you can start the Rojo dev server by running a command in your project's directory:
-
-```sh
-rojo serve
-```
-
-If your project is in the right place, Rojo will let you know that it was found and start an HTTP server that the plugin can connect to.
-
-In Roblox Studio, open the plugins tab and find Rojo's buttons.
-
-![Location of Rojo's plugin buttons in Roblox Studio](/images/plugin-buttons.png)
-{: align="center" }
-
-Press **Test Connection** to verify that the plugin can communicate with the dev server. Watch the Output panel for the results.
-
-!!! info
-    If you see an error message, return to the previous steps and make sure that the Rojo dev server is running.
-
-    ![Rojo error in Roblox Studio Output](/images/connection-error.png)
-    {: align="center" }
-
-After your connection was successful, press **Sync In** to move code from the filesystem into Studio, or use **Toggle Polling** to have Rojo automatically sync in changes as they happen.
-
-## Importing an Existing Project
-Rojo will eventually support importing an existing Roblox project onto the filesystem for use with Rojo.
-
-Rojo doesn't currently support converting an existing project or syncing files from Roblox Studio onto the filesystem. In the mean time, you can manually copy your files into the structure that Rojo expects.
-
-Up-to-date information will be available on [issue #5](https://github.com/LPGhatguy/rojo/issues/5) as this is worked on.

docs/getting-started/installation.md

@@ -1,23 +0,0 @@
-# Installation
-Rojo has two components:
-
-* The server, a binary written in Rust
-* The plugin, a Roblox Studio plugin written in Lua
-
-It's important that the plugin and server are compatible. The plugin will show errors in the Roblox Studio Output window if there is a version mismatch.
-
-## Installing the Server
-To install the server, either:
-
-* If you have Rust installed, use `cargo install rojo`
-* Or, download a pre-built Windows binary from [the GitHub releases page](https://github.com/LPGhatguy/rojo/releases)
-
-**The Rojo binary must be run from the command line, like Terminal on MacOS or `cmd.exe` on Windows. It's recommended that you put the Rojo binary on your `PATH` to make this easier.**
-
-## Installing the Plugin
-To install the plugin, either:
-
-* Install the plugin from the [Roblox plugin page](https://www.roblox.com/library/1211549683/Rojo).
-  * This gives you less control over what version you install -- you will always have the latest version.
-* Or, download the latest release from [the GitHub releases section](https://github.com/LPGhatguy/rojo/releases) and install it into your Roblox plugins folder
-  * You can open this folder by clicking the "Plugins Folder" button from the Plugins toolbar in Roblox Studio

docs/index.md

@@ -1,6 +0,0 @@
-# Home
-This is the documentation home for Rojo.
-
-**Rojo** is a flexible multi-tool designed for creating robust Roblox projects.
-
-This documentation is a work in progress, and is incomplete.

docs/requirements.txt

@@ -1,3 +0,0 @@
-mkdocs
-mkdocs-material
-pymdown-extensions

docs/sync-details.md

@@ -1,61 +0,0 @@
-# Sync Details
-This page aims to describe how Rojo turns files on the filesystem into Roblox objects.
-
-## Folders
-Any directory on the filesystem will turn into a `Folder` instance in Roblox, unless that folder matches the name of a service or other existing instance. In those cases, that instance will be preserved.
-
-## Scripts
-Rojo can represent `ModuleScript`, `Script`, and `LocalScript` objects. The default script type is `ModuleScript`, since most scripts in well-structued Roblox projects will be modules.
-
-| File Name      | Instance Type  |
-| -------------- | -------------- |
-| `*.server.lua` | `Script`       |
-| `*.client.lua` | `LocalScript`  |
-| `*.lua`        | `ModuleScript` |
-
-If a directory contains a file named `init.server.lua`, `init.client.lua`, or `init.lua`, that folder will be transformed into a `*Script` instance with the conents of the `init` file. This can be used to create scripts inside of scripts.
-
-For example, this file tree:
-
-* my-game
-    * init.client.lua
-    * foo.lua
-
-Will turn into these instances in Roblox:
-
-![Example of Roblox instances](/images/sync-example.png)
-
-## Models
-Rojo supports a JSON model format for representing simple models. It's designed for instance types like `BindableEvent` or `*Value` objects, and is not suitable for larger models.
-
-!!! info
-    In the future, Rojo will support `.rbxmx` models. See [issue #7](https://github.com/LPGhatguy/rojo/issues/7) for more details and updates on this feature.
-
-JSON model files are strict, with every property being required. They look like this:
-
-```json
-{
-    "Name": "hello",
-    "ClassName": "Model",
-    "Children": [
-        {
-            "Name": "Some Part",
-            "ClassName": "Part",
-            "Children": [],
-            "Properties": {}
-        },
-        {
-            "Name": "Some StringValue",
-            "ClassName": "StringValue",
-            "Children": [],
-            "Properties": {
-                "Value": {
-                    "Type": "String",
-                    "Value": "Hello, world!"
-                }
-            }
-        }
-    ],
-    "Properties": {}
-}
-```

docs/why-rojo.md

@@ -1,21 +0,0 @@
-# Why Rojo?
-There are a number of existing plugins for Roblox that move code from the filesystem into Roblox.
-
-Besides Rojo, there is:
-
-* [Studio Bridge](https://github.com/vocksel/studio-bridge) by [Vocksel](https://github.com/vocksel)
-* [RbxRefresh](https://github.com/osyrisrblx/RbxRefresh) by [Osyris](https://github.com/osyrisrblx)
-* [RbxSync](https://github.com/evaera/RbxSync) by [evaera](https://github.com/evaera)
-* [CodeSync](https://github.com/MemoryPenguin/CodeSync) and [rbx-exteditor](https://github.com/MemoryPenguin/rbx-exteditor) by [MemoryPenguin](https://github.com/MemoryPenguin)
-* [rbxmk](https://github.com/anaminus/rbxmk) by [Anaminus](https://github.com/anaminus)
-
-So why did I build Rojo?
-
-Each of these tools solves what is essentially the same problem from a few different angles. The goal of Rojo is to take all of the lessons and ideas learned from these projects and build a tool that can solve the problem for good.
-
-Additionally:
-
-* I think that this tool needs to be built in a compiled language without a runtime, for easy distribution and good performance.
-* I think that the conventions promoted by other sync plugins (`.module.lua` for modules, as well a single sync point) are sub-optimal.
-* I think that I have a good enough understanding of the problem to build something robust.
-* I think that Rojo should be able to do more than just sync code.

mkdocs.yml

@@ -1,26 +0,0 @@
-site_name: Rojo Documentation
-site_url: https://lpghatguy.github.io/rojo/
-repo_name: LPGhatguy/rojo
-repo_url: https://github.com/LPGhatguy/rojo
-
-theme:
-  name: material
-  palette:
-    primary: 'Red'
-    accent: 'Red'
-
-pages:
-  - Home: index.md
-  - Why Rojo?: why-rojo.md
-  - Getting Started:
-    - Installation: getting-started/installation.md
-    - Creating a Project: getting-started/creating-a-project.md
-  - Sync Details: sync-details.md
-
-markdown_extensions:
-  - attr_list
-  - admonition
-  - codehilite:
-      guess_lang: false
-  - toc:
-      permalink: true

plugin/.editorconfig

@@ -1,4 +0,0 @@
-[*.lua]
-indent_style = tab
-trim_trailing_whitespace = true
-insert_final_newline = true

plugin/.gitignore

@@ -1 +0,0 @@
-/luacov.*

plugin/.luacov

@@ -1,8 +0,0 @@
-return {
-	include = {
-		"^src",
-	},
-	exclude = {
-		"%.spec$",
-	},
-}

plugin/default.project.json

@@ -0,0 +1,30 @@
+{
+  "name": "Rojo",
+  "tree": {
+    "$className": "Folder",
+    "Plugin": {
+      "$path": "src"
+    },
+    "Log": {
+      "$path": "log"
+    },
+    "Http": {
+      "$path": "http"
+    },
+    "Fmt": {
+      "$path": "fmt"
+    },
+    "Roact": {
+      "$path": "modules/roact/src"
+    },
+    "Promise": {
+      "$path": "modules/promise/lib"
+    },
+    "t": {
+      "$path": "modules/t/lib"
+    },
+    "RbxDom": {
+      "$path": "modules/rbx-dom/rbx_dom_lua/src"
+    }
+  }
+}

plugin/fmt/init.lua

@@ -0,0 +1,245 @@
+--[[
+	This library describes a formatting mechanism akin to Rust's std::fmt.
+
+	It has a couple building blocks:
+
+	* A new syntax for formatting strings, taken verbatim from Rust. It'd also
+	  be possible to use printf-style formatting specifiers to integrate with
+	  the existing string.format utility.
+
+	* An equivalent to Rust's `Display` trait. We're mapping the semantics of
+	  tostring and the __tostring metamethod onto this trait. A lot of types
+	  should already have __tostring implementations, too!
+
+	* An equivalent to Rust's `Debug` trait. This library Lua-ifies that idea by
+	  inventing a new metamethod, `__fmtDebug`. We pass along the "extended
+	  form" attribute which is the equivalent of the "alternate mode" in Rust's
+	  Debug trait since it's the author's opinion that treating it as a
+	  verbosity flag is semantically accurate.
+]]
+
+--[[
+	The default implementation of __fmtDebug for tables when the extended option
+	is not set.
+]]
+local function defaultTableDebug(buffer, input)
+	buffer:writeRaw("{")
+
+	for key, value in pairs(input) do
+		buffer:write("[{:?}] = {:?}", key, value)
+
+		if next(input, key) ~= nil then
+			buffer:writeRaw(", ")
+		end
+	end
+
+	buffer:writeRaw("}")
+end
+
+--[[
+	The default implementation of __fmtDebug for tables with the extended option
+	set.
+]]
+local function defaultTableDebugExtended(buffer, input)
+	-- Special case for empty tables.
+	if next(input) == nil then
+		buffer:writeRaw("{}")
+		return
+	end
+
+	buffer:writeLineRaw("{")
+	buffer:indent()
+
+	for key, value in pairs(input) do
+		buffer:writeLine("[{:?}] = {:#?},", key, value)
+	end
+
+	buffer:unindent()
+	buffer:writeRaw("}")
+end
+
+--[[
+	The default debug representation for all types.
+]]
+local function debugImpl(buffer, value, extendedForm)
+	local valueType = typeof(value)
+
+	if valueType == "string" then
+		local formatted = string.format("%q", value)
+		buffer:writeRaw(formatted)
+	elseif valueType == "table" then
+		local valueMeta = getmetatable(value)
+
+		if valueMeta ~= nil and  valueMeta.__fmtDebug ~= nil then
+			-- This type implement's the metamethod we made up to line up with
+			-- Rust's 'Debug' trait.
+
+			valueMeta.__fmtDebug(value, buffer, extendedForm)
+		else
+			if extendedForm then
+				defaultTableDebugExtended(buffer, value)
+			else
+				defaultTableDebug(buffer, value)
+			end
+		end
+	elseif valueType == "Instance" then
+		buffer:writeRaw(value:GetFullName())
+	else
+		buffer:writeRaw(tostring(value))
+	end
+end
+
+--[[
+	Defines and implements the library's template syntax.
+]]
+local function writeFmt(buffer, template, ...)
+	local currentArg = 0
+	local i = 1
+	local len = #template
+
+	while i <= len do
+		local openBrace = template:find("{", i)
+
+		if openBrace == nil then
+			-- There are no remaining open braces in this string, so we can
+			-- write the rest of the string to the buffer.
+
+			buffer:writeRaw(template:sub(i))
+			break
+		else
+			-- We found an open brace! This could be:
+			-- - A literal '{', written as '{{'
+			-- - The beginning of an interpolation, like '{}'
+			-- - An error, if there's no matching '}'
+
+			local charAfterBrace = template:sub(openBrace + 1, openBrace + 1)
+			if charAfterBrace == "{" then
+				-- This is a literal brace, so we'll write everything up to this
+				-- point (including the first brace), and then skip over the
+				-- second brace.
+
+				buffer:writeRaw(template:sub(i, openBrace))
+				i = openBrace + 2
+			else
+				-- This SHOULD be an interpolation. We'll find our matching
+				-- brace and treat the contents as the formatting specifier.
+
+				-- If there were any unwritten characters before this
+				-- interpolation, write them to the buffer.
+				if openBrace - i > 0 then
+					buffer:writeRaw(template:sub(i, openBrace - 1))
+				end
+
+				local closeBrace = template:find("}", openBrace + 1)
+				assert(closeBrace ~= nil, "Unclosed formatting specifier. Use '{{' to write an open brace.")
+
+				local formatSpecifier = template:sub(openBrace + 1, closeBrace - 1)
+				currentArg = currentArg + 1
+				local arg = select(currentArg, ...)
+
+				if formatSpecifier == "" then
+					-- This should use the equivalent of Rust's 'Display', ie
+					-- tostring and the __tostring metamethod.
+
+					buffer:writeRaw(tostring(arg))
+				elseif formatSpecifier == ":?" then
+					-- This should use the equivalent of Rust's 'Debug',
+					-- invented for this library as __fmtDebug.
+
+					debugImpl(buffer, arg, false)
+				elseif formatSpecifier == ":#?" then
+					-- This should use the equivlant of Rust's 'Debug' with the
+					-- 'alternate' (ie expanded) flag set.
+
+					debugImpl(buffer, arg, true)
+				else
+					error("unsupported format specifier " .. formatSpecifier, 2)
+				end
+
+				i = closeBrace + 1
+			end
+		end
+	end
+end
+
+local function debugOutputBuffer()
+	local buffer = {}
+	local startOfLine = true
+	local indentLevel = 0
+	local indentation = ""
+
+	function buffer:writeLine(template, ...)
+		writeFmt(self, template, ...)
+		self:nextLine()
+	end
+
+	function buffer:writeLineRaw(value)
+		self:writeRaw(value)
+		self:nextLine()
+	end
+
+	function buffer:write(template, ...)
+		return writeFmt(self, template, ...)
+	end
+
+	function buffer:writeRaw(value)
+		if #value > 0 then
+			if startOfLine and #indentation > 0 then
+				startOfLine = false
+				table.insert(self, indentation)
+			end
+
+			table.insert(self, value)
+			startOfLine = false
+		end
+	end
+
+	function buffer:nextLine()
+		table.insert(self, "\n")
+		startOfLine = true
+	end
+
+	function buffer:indent()
+		indentLevel = indentLevel + 1
+		indentation = string.rep("    ", indentLevel)
+	end
+
+	function buffer:unindent()
+		indentLevel = math.max(0, indentLevel - 1)
+		indentation = string.rep("    ", indentLevel)
+	end
+
+	function buffer:finish()
+		return table.concat(self, "")
+	end
+
+	return buffer
+end
+
+local function fmt(template, ...)
+	local buffer = debugOutputBuffer()
+	writeFmt(buffer, template, ...)
+	return buffer:finish()
+end
+
+--[[
+	Wrap the given object in a type that implements the given function as its
+	Debug implementation, and forwards __tostring to the type's underlying
+	tostring implementation.
+]]
+local function debugify(object, fmtFunc)
+	return setmetatable({}, {
+		__fmtDebug = function(_, ...)
+			return fmtFunc(object, ...)
+		end,
+		__tostring = function()
+			return tostring(object)
+		end,
+	})
+end
+
+return {
+	debugOutputBuffer = debugOutputBuffer,
+	fmt = fmt,
+	debugify = debugify,
+}

plugin/http/Error.lua

@@ -0,0 +1,66 @@
+local Error = {}
+Error.__index = Error
+
+Error.Kind = {
+	HttpNotEnabled = {
+		message = "Rojo requires HTTP access, which is not enabled.\n" ..
+			"Check your game settings, located in the 'Home' tab of Studio.",
+	},
+	ConnectFailed = {
+		message = "Couldn't connect to the Rojo server.\n" ..
+			"Make sure the server is running -- use 'rojo serve' to run it!",
+	},
+	Timeout = {
+		message = "HTTP request timed out.",
+	},
+	Unknown = {
+		message = "Unknown HTTP error: {{message}}",
+	},
+}
+
+setmetatable(Error.Kind, {
+	__index = function(_, key)
+		error(("%q is not a valid member of Http.Error.Kind"):format(tostring(key)), 2)
+	end,
+})
+
+function Error.new(type, extraMessage)
+	extraMessage = extraMessage or ""
+	local message = type.message:gsub("{{message}}", extraMessage)
+
+	local err = {
+		type = type,
+		message = message,
+	}
+
+	setmetatable(err, Error)
+
+	return err
+end
+
+function Error:__tostring()
+	return self.message
+end
+
+--[[
+	This method shouldn't have to exist. Ugh.
+]]
+function Error.fromRobloxErrorString(message)
+	local lower = message:lower()
+
+	if lower:find("^http requests are not enabled") then
+		return Error.new(Error.Kind.HttpNotEnabled)
+	end
+
+	if lower:find("^httperror: timedout") then
+		return Error.new(Error.Kind.Timeout)
+	end
+
+	if lower:find("^httperror: connectfail") then
+		return Error.new(Error.Kind.ConnectFailed)
+	end
+
+	return Error.new(Error.Kind.Unknown, message)
+end
+
+return Error

plugin/http/Response.lua

@@ -0,0 +1,34 @@
+local HttpService = game:GetService("HttpService")
+
+local stringTemplate = [[
+Http.Response {
+	code: %d
+	body: %s
+}]]
+
+local Response = {}
+Response.__index = Response
+
+function Response:__tostring()
+	return stringTemplate:format(self.code, self.body)
+end
+
+function Response.fromRobloxResponse(response)
+	local self = {
+		body = response.Body,
+		code = response.StatusCode,
+		headers = response.Headers,
+	}
+
+	return setmetatable(self, Response)
+end
+
+function Response:isSuccess()
+	return self.code >= 200 and self.code < 300
+end
+
+function Response:json()
+	return HttpService:JSONDecode(self.body)
+end
+
+return Response

plugin/http/init.lua

@@ -0,0 +1,66 @@
+local HttpService = game:GetService("HttpService")
+
+local Promise = require(script.Parent.Promise)
+local Log = require(script.Parent.Log)
+
+local HttpError = require(script.Error)
+local HttpResponse = require(script.Response)
+
+local lastRequestId = 0
+
+local Http = {}
+
+Http.Error = HttpError
+Http.Response = HttpResponse
+
+local function performRequest(requestParams)
+	local requestId = lastRequestId + 1
+	lastRequestId = requestId
+
+	Log.trace("HTTP {}({}) {}", requestParams.Method, requestId, requestParams.Url)
+
+	if requestParams.Body ~= nil then
+		Log.trace("{}", requestParams.Body)
+	end
+
+	return Promise.new(function(resolve, reject)
+		coroutine.wrap(function()
+			local success, response = pcall(function()
+				return HttpService:RequestAsync(requestParams)
+			end)
+
+			if success then
+				Log.trace("Request {} success, status code {}", requestId, response.StatusCode)
+				resolve(HttpResponse.fromRobloxResponse(response))
+			else
+				Log.trace("Request {} failure: {:?}", requestId, response)
+				reject(HttpError.fromRobloxErrorString(response))
+			end
+		end)()
+	end)
+end
+
+function Http.get(url)
+	return performRequest({
+		Url = url,
+		Method = "GET",
+	})
+end
+
+function Http.post(url, body)
+	return performRequest({
+		Url = url,
+		Method = "POST",
+		Body = body,
+	})
+end
+
+function Http.jsonEncode(object)
+	return HttpService:JSONEncode(object)
+end
+
+function Http.jsonDecode(source)
+	return HttpService:JSONDecode(source)
+end
+
+return Http

plugin/http/init.spec.lua

@@ -0,0 +1,5 @@
+return function()
+	it("should load", function()
+		require(script.Parent)
+	end)
+end

plugin/log/init.lua

@@ -0,0 +1,56 @@
+local Fmt = require(script.Parent.Fmt)
+
+local Level = {
+	Error = 0,
+	Warning = 1,
+	Info = 2,
+	Debug = 3,
+	Trace = 4,
+}
+
+local function getLogLevel()
+	return Level.Info
+end
+
+local function addTags(tag, message)
+	return tag .. message:gsub("\n", "\n" .. tag)
+end
+
+local TRACE_TAG = (" "):rep(15) .. "[Rojo-Trace] "
+local INFO_TAG = (" "):rep(15) .. "[Rojo-Info] "
+local DEBUG_TAG = (" "):rep(15) .. "[Rojo-Debug] "
+local WARN_TAG = "[Rojo-Warn] "
+
+local Log = {}
+
+Log.Level = Level
+
+function Log.setLogLevelThunk(thunk)
+	getLogLevel = thunk
+end
+
+function Log.trace(template, ...)
+	if getLogLevel() >= Level.Trace then
+		print(addTags(TRACE_TAG, Fmt.fmt(template, ...)))
+	end
+end
+
+function Log.info(template, ...)
+	if getLogLevel() >= Level.Info then
+		print(addTags(INFO_TAG, Fmt.fmt(template, ...)))
+	end
+end
+
+function Log.debug(template, ...)
+	if getLogLevel() >= Level.Debug then
+		print(addTags(DEBUG_TAG, Fmt.fmt(template, ...)))
+	end
+end
+
+function Log.warn(template, ...)
+	if getLogLevel() >= Level.Warning then
+		warn(addTags(WARN_TAG, Fmt.fmt(template, ...)))
+	end
+end
+
+return Log

plugin/log/init.spec.lua

@@ -0,0 +1,5 @@
+return function()
+	it("should load", function()
+		require(script.Parent)
+	end)
+end

plugin/rojo.json

@@ -1,34 +0,0 @@
-{
-  "name": "rojo",
-  "servePort": 8000,
-  "partitions": {
-    "plugin": {
-      "path": "src",
-      "target": "ReplicatedStorage.Rojo.plugin"
-    },
-    "modules/roact": {
-      "path": "modules/roact/lib",
-      "target": "ReplicatedStorage.Rojo.modules.Roact"
-    },
-    "modules/rodux": {
-      "path": "modules/rodux/lib",
-      "target": "ReplicatedStorage.Rojo.modules.Rodux"
-    },
-    "modules/roact-rodux": {
-      "path": "modules/roact-rodux/lib",
-      "target": "ReplicatedStorage.Rojo.modules.RoactRodux"
-    },
-    "modules/promise": {
-      "path": "modules/promise/lib",
-      "target": "ReplicatedStorage.Rojo.modules.Promise"
-    },
-    "modules/testez": {
-      "path": "modules/testez/lib",
-      "target": "ReplicatedStorage.TestEZ"
-    },
-    "tests": {
-      "path": "tests",
-      "target": "TestService"
-    }
-  }
-}

plugin/spec.lua

@@ -1,69 +0,0 @@
---[[
-	Loads our library and all of its dependencies, then runs tests using TestEZ.
-]]
-
--- If you add any dependencies, add them to this table so they'll be loaded!
-local LOAD_MODULES = {
-	{"src", "Plugin"},
-	{"modules/testez/lib", "TestEZ"},
-}
-
--- This makes sure we can load Lemur and other libraries that depend on init.lua
-package.path = package.path .. ";?/init.lua"
-
--- If this fails, make sure you've run `lua bin/install-dependencies.lua` first!
-local lemur = require("modules.lemur")
-
---[[
-	Collapses ModuleScripts named 'init' into their parent folders.
-
-	This is the same result as the collapsing mechanism from Rojo.
-]]
-local function collapse(root)
-	local init = root:FindFirstChild("init")
-	if init then
-		init.Name = root.Name
-		init.Parent = root.Parent
-
-		for _, child in ipairs(root:GetChildren()) do
-			child.Parent = init
-		end
-
-		root:Destroy()
-		root = init
-	end
-
-	for _, child in ipairs(root:GetChildren()) do
-		if child:IsA("Folder") then
-			collapse(child)
-		end
-	end
-
-	return root
-end
-
--- Create a virtual Roblox tree
-local habitat = lemur.Habitat.new()
-
--- We'll put all of our library code and dependencies here
-local Root = lemur.Instance.new("Folder")
-Root.Name = "Root"
-
--- Load all of the modules specified above
-for _, module in ipairs(LOAD_MODULES) do
-	local container = lemur.Instance.new("Folder", Root)
-	container.Name = module[2]
-	habitat:loadFromFs(module[1], container)
-end
-
-collapse(Root)
-
--- Load TestEZ and run our tests
-local TestEZ = habitat:require(Root.TestEZ)
-
-local results = TestEZ.TestBootstrap:run(Root.Plugin, TestEZ.Reporters.TextReporter)
-
--- Did something go wrong?
-if results.failureCount > 0 then
-	os.exit(1)
-end

plugin/src/Api.lua

@@ -1,113 +0,0 @@
-local HttpService = game:GetService("HttpService")
-
-local Promise = require(script.Parent.Parent.modules.Promise)
-
-local Config = require(script.Parent.Config)
-local Version = require(script.Parent.Version)
-
-local Api = {}
-Api.__index = Api
-
-Api.Error = {
-	ServerIdMismatch = "ServerIdMismatch",
-}
-
-setmetatable(Api.Error, {
-	__index = function(_, key)
-		error("Invalid API.Error name " .. key, 2)
-	end
-})
-
---[[
-	Api.connect(Http) -> Promise<Api>
-
-	Create a new Api using the given HTTP implementation.
-
-	Attempting to invoke methods on an invalid conext will throw errors!
-]]
-function Api.connect(http)
-	local context = {
-		http = http,
-		serverId = nil,
-		currentTime = 0,
-	}
-
-	setmetatable(context, Api)
-
-	return context:_start()
-end
-
-function Api:_start()
-	return self.http:get("/")
-		:andThen(function(response)
-			response = response:json()
-
-			if response.protocolVersion ~= Config.protocolVersion then
-				local message = (
-					"Found a Rojo dev server, but it's using a different protocol version, and is incompatible." ..
-					"\nMake sure you have matching versions of both the Rojo plugin and server!" ..
-					"\n\nYour client is version %s, with protocol version %s. It expects server version %s." ..
-					"\nYour server is version %s, with protocol version %s." ..
-					"\n\nGo to https://github.com/LPGhatguy/rojo for more details."
-				):format(
-					Version.display(Config.version), Config.protocolVersion,
-					Config.expectedApiVersionString,
-					response.serverVersion, response.protocolVersion
-				)
-
-				return Promise.reject(message)
-			end
-
-			self.serverId = response.serverId
-			self.currentTime = response.currentTime
-
-			return self
-		end)
-end
-
-function Api:getInfo()
-	return self.http:get("/")
-		:andThen(function(response)
-			response = response:json()
-
-			if response.serverId ~= self.serverId then
-				return Promise.reject(Api.Error.ServerIdMismatch)
-			end
-
-			return response
-		end)
-end
-
-function Api:read(paths)
-	local body = HttpService:JSONEncode(paths)
-
-	return self.http:post("/read", body)
-		:andThen(function(response)
-			response = response:json()
-
-			if response.serverId ~= self.serverId then
-				return Promise.reject(Api.Error.ServerIdMismatch)
-			end
-
-			return response.items
-		end)
-end
-
-function Api:getChanges()
-	local url = ("/changes/%f"):format(self.currentTime)
-
-	return self.http:get(url)
-		:andThen(function(response)
-			response = response:json()
-
-			if response.serverId ~= self.serverId then
-				return Promise.reject(Api.Error.ServerIdMismatch)
-			end
-
-			self.currentTime = response.currentTime
-
-			return response.changes
-		end)
-end
-
-return Api

plugin/src/ApiContext.lua

@@ -0,0 +1,236 @@
+local Http = require(script.Parent.Parent.Http)
+local Log = require(script.Parent.Parent.Log)
+local Promise = require(script.Parent.Parent.Promise)
+
+local Config = require(script.Parent.Config)
+local Types = require(script.Parent.Types)
+local Version = require(script.Parent.Version)
+
+local validateApiInfo = Types.ifEnabled(Types.ApiInfoResponse)
+local validateApiRead = Types.ifEnabled(Types.ApiReadResponse)
+local validateApiSubscribe = Types.ifEnabled(Types.ApiSubscribeResponse)
+
+--[[
+	Returns a promise that will never resolve nor reject.
+]]
+local function hangingPromise()
+	return Promise.new(function() end)
+end
+
+local function rejectFailedRequests(response)
+	if response.code >= 400 then
+		local message = string.format("HTTP %s:\n%s", tostring(response.code), response.body)
+
+		return Promise.reject(message)
+	end
+
+	return response
+end
+
+local function rejectWrongProtocolVersion(infoResponseBody)
+	if infoResponseBody.protocolVersion ~= Config.protocolVersion then
+		local message = (
+			"Found a Rojo dev server, but it's using a different protocol version, and is incompatible." ..
+			"\nMake sure you have matching versions of both the Rojo plugin and server!" ..
+			"\n\nYour client is version %s, with protocol version %s. It expects server version %s." ..
+			"\nYour server is version %s, with protocol version %s." ..
+			"\n\nGo to https://github.com/rojo-rbx/rojo for more details."
+		):format(
+			Version.display(Config.version), Config.protocolVersion,
+			Config.expectedServerVersionString,
+			infoResponseBody.serverVersion, infoResponseBody.protocolVersion
+		)
+
+		return Promise.reject(message)
+	end
+
+	return Promise.resolve(infoResponseBody)
+end
+
+local function rejectWrongPlaceId(infoResponseBody)
+	if infoResponseBody.expectedPlaceIds ~= nil then
+		local foundId = false
+
+		for _, id in ipairs(infoResponseBody.expectedPlaceIds) do
+			if id == game.PlaceId then
+				foundId = true
+				break
+			end
+		end
+
+		if not foundId then
+			local idList = {}
+			for _, id in ipairs(infoResponseBody.expectedPlaceIds) do
+				table.insert(idList, "- " .. tostring(id))
+			end
+
+			local message = (
+				"Found a Rojo server, but its project is set to only be used with a specific list of places." ..
+				"\nYour place ID is %s, but needs to be one of these:" ..
+				"\n%s" ..
+				"\n\nTo change this list, edit 'servePlaceIds' in your .project.json file."
+			):format(
+				tostring(game.PlaceId),
+				table.concat(idList, "\n")
+			)
+
+			return Promise.reject(message)
+		end
+	end
+
+	return Promise.resolve(infoResponseBody)
+end
+
+local ApiContext = {}
+ApiContext.__index = ApiContext
+
+function ApiContext.new(baseUrl)
+	assert(type(baseUrl) == "string")
+
+	local self = {
+		__baseUrl = baseUrl,
+		__sessionId = nil,
+		__messageCursor = -1,
+		__connected = true,
+	}
+
+	return setmetatable(self, ApiContext)
+end
+
+function ApiContext:__fmtDebug(output)
+	output:writeLine("ApiContext {{")
+	output:indent()
+
+	output:writeLine("Connected: {}", self.__connected)
+	output:writeLine("Base URL: {}", self.__baseUrl)
+	output:writeLine("Session ID: {}", self.__sessionId)
+	output:writeLine("Message Cursor: {}", self.__messageCursor)
+
+	output:unindent()
+	output:write("}")
+end
+
+function ApiContext:disconnect()
+	self.__connected = false
+end
+
+function ApiContext:setMessageCursor(index)
+	self.__messageCursor = index
+end
+
+function ApiContext:connect()
+	local url = ("%s/api/rojo"):format(self.__baseUrl)
+
+	return Http.get(url)
+		:andThen(rejectFailedRequests)
+		:andThen(Http.Response.json)
+		:andThen(rejectWrongProtocolVersion)
+		:andThen(function(body)
+			assert(validateApiInfo(body))
+
+			return body
+		end)
+		:andThen(rejectWrongPlaceId)
+		:andThen(function(body)
+			self.__sessionId = body.sessionId
+
+			return body
+		end)
+end
+
+function ApiContext:read(ids)
+	local url = ("%s/api/read/%s"):format(self.__baseUrl, table.concat(ids, ","))
+
+	return Http.get(url)
+		:andThen(rejectFailedRequests)
+		:andThen(Http.Response.json)
+		:andThen(function(body)
+			if body.sessionId ~= self.__sessionId then
+				return Promise.reject("Server changed ID")
+			end
+
+			assert(validateApiRead(body))
+
+			return body
+		end)
+end
+
+function ApiContext:write(patch)
+	local url = ("%s/api/write"):format(self.__baseUrl)
+
+	local updated = {}
+	for _, update in ipairs(patch.updated) do
+		local fixedUpdate = {
+			id = update.id,
+			changedName = update.changedName,
+		}
+
+		if next(update.changedProperties) ~= nil then
+			fixedUpdate.changedProperties = update.changedProperties
+		end
+
+		table.insert(updated, fixedUpdate)
+	end
+
+	-- Only add the 'added' field if the table is non-empty, or else Roblox's
+	-- JSON implementation will turn the table into an array instead of an
+	-- object, causing API validation to fail.
+	local added
+	if next(patch.added) ~= nil then
+		added = patch.added
+	end
+
+	local body = {
+		sessionId = self.__sessionId,
+		removed = patch.removed,
+		updated = updated,
+		added = added,
+	}
+
+	body = Http.jsonEncode(body)
+
+	return Http.post(url, body)
+		:andThen(rejectFailedRequests)
+		:andThen(Http.Response.json)
+		:andThen(function(body)
+			Log.info("Write response: {:?}", body)
+
+			return body
+		end)
+end
+
+function ApiContext:retrieveMessages()
+	local url = ("%s/api/subscribe/%s"):format(self.__baseUrl, self.__messageCursor)
+
+	local function sendRequest()
+		return Http.get(url)
+			:catch(function(err)
+				if err.type == Http.Error.Kind.Timeout then
+					if self.__connected then
+						return sendRequest()
+					else
+						return hangingPromise()
+					end
+				end
+
+				return Promise.reject(err)
+			end)
+	end
+
+	return sendRequest()
+		:andThen(rejectFailedRequests)
+		:andThen(Http.Response.json)
+		:andThen(function(body)
+			if body.sessionId ~= self.__sessionId then
+				return Promise.reject("Server changed ID")
+			end
+
+			assert(validateApiSubscribe(body))
+
+			self:setMessageCursor(body.messageCursor)
+
+			return body.messages
+		end)
+end
+
+return ApiContext

plugin/src/Assets.lua

@@ -0,0 +1,34 @@
+local strict = require(script.Parent.strict)
+
+local Assets = {
+	Sprites = {},
+	Slices = {
+		RoundBox = {
+			asset = "rbxassetid://2773204550",
+			offset = Vector2.new(0, 0),
+			size = Vector2.new(32, 32),
+			center = Rect.new(4, 4, 4, 4),
+		},
+	},
+	Images = {
+		Logo = "rbxassetid://3405346157",
+		Icon = "rbxassetid://3405341609",
+	},
+	StartSession = "",
+	SessionActive = "",
+	Configure = "",
+}
+
+local function guardForTypos(name, map)
+	strict(name, map)
+
+	for key, child in pairs(map) do
+		if type(child) == "table" then
+			guardForTypos(("%s.%s"):format(name, key), child)
+		end
+	end
+end
+
+guardForTypos("Assets", Assets)
+
+return Assets

plugin/src/Components/App.lua

@@ -0,0 +1,225 @@
+local Rojo = script:FindFirstAncestor("Rojo")
+local Plugin = Rojo.Plugin
+
+local Roact = require(Rojo.Roact)
+local Log = require(Rojo.Log)
+
+local ApiContext = require(Plugin.ApiContext)
+local Assets = require(Plugin.Assets)
+local Config = require(Plugin.Config)
+local DevSettings = require(Plugin.DevSettings)
+local ServeSession = require(Plugin.ServeSession)
+local Version = require(Plugin.Version)
+local preloadAssets = require(Plugin.preloadAssets)
+local strict = require(Plugin.strict)
+
+local ConnectPanel = require(Plugin.Components.ConnectPanel)
+local ConnectingPanel = require(Plugin.Components.ConnectingPanel)
+local ConnectionActivePanel = require(Plugin.Components.ConnectionActivePanel)
+local ErrorPanel = require(Plugin.Components.ErrorPanel)
+
+local e = Roact.createElement
+
+local function showUpgradeMessage(lastVersion)
+	local message = (
+		"Rojo detected an upgrade from version %s to version %s." ..
+		"\nMake sure you have also upgraded your server!" ..
+		"\n\nRojo plugin version %s is intended for use with server version %s."
+	):format(
+		Version.display(lastVersion), Version.display(Config.version),
+		Version.display(Config.version), Config.expectedServerVersionString
+	)
+
+	Log.info(message)
+end
+
+--[[
+	Check if the user is using a newer version of Rojo than last time. If they
+	are, show them a reminder to make sure they check their server version.
+]]
+local function checkUpgrade(plugin)
+	-- When developing Rojo, there's no use in doing version checks
+	if DevSettings:isEnabled() then
+		return
+	end
+
+	local lastVersion = plugin:GetSetting("LastRojoVersion")
+
+	if lastVersion then
+		local wasUpgraded = Version.compare(Config.version, lastVersion) == 1
+
+		if wasUpgraded then
+			showUpgradeMessage(lastVersion)
+		end
+	end
+
+	plugin:SetSetting("LastRojoVersion", Config.version)
+end
+
+local AppStatus = strict("AppStatus", {
+	NotStarted = "NotStarted",
+	Connecting = "Connecting",
+	Connected = "Connected",
+	Error = "Error",
+})
+
+local App = Roact.Component:extend("App")
+
+function App:init()
+	self:setState({
+		appStatus = AppStatus.NotStarted,
+		errorMessage = nil,
+	})
+
+	self.signals = {}
+	self.serveSession = nil
+
+	self.displayedVersion = DevSettings:isEnabled()
+		and Config.codename
+		or Version.display(Config.version)
+
+	local toolbar = self.props.plugin:CreateToolbar("Rojo " .. self.displayedVersion)
+
+	self.toggleButton = toolbar:CreateButton(
+		"Rojo",
+		"Show or hide the Rojo panel",
+		Assets.Images.Icon)
+	self.toggleButton.ClickableWhenViewportHidden = true
+	self.toggleButton.Click:Connect(function()
+		self.dockWidget.Enabled = not self.dockWidget.Enabled
+	end)
+
+	local widgetInfo = DockWidgetPluginGuiInfo.new(
+		Enum.InitialDockState.Right,
+		false, -- Initially enabled state
+		false, -- Whether to override the widget's previous state
+		360, 190, -- Floating size
+		360, 190 -- Minimum size
+	)
+
+	self.dockWidget = self.props.plugin:CreateDockWidgetPluginGui("Rojo-" .. self.displayedVersion, widgetInfo)
+	self.dockWidget.Name = "Rojo " .. self.displayedVersion
+	self.dockWidget.Title = "Rojo " .. self.displayedVersion
+	self.dockWidget.AutoLocalize = false
+	self.dockWidget.ZIndexBehavior = Enum.ZIndexBehavior.Sibling
+
+	self.signals.dockWidgetEnabled = self.dockWidget:GetPropertyChangedSignal("Enabled"):Connect(function()
+		self.toggleButton:SetActive(self.dockWidget.Enabled)
+	end)
+end
+
+function App:startSession(address, port)
+	Log.trace("Starting new session")
+
+	local baseUrl = ("http://%s:%s"):format(address, port)
+	self.serveSession = ServeSession.new({
+		apiContext = ApiContext.new(baseUrl),
+	})
+
+	self.serveSession:onStatusChanged(function(status, details)
+		if status == ServeSession.Status.Connecting then
+			self:setState({
+				appStatus = AppStatus.Connecting,
+			})
+		elseif status == ServeSession.Status.Connected then
+			self:setState({
+				appStatus = AppStatus.Connected,
+			})
+		elseif status == ServeSession.Status.Disconnected then
+			self.serveSession = nil
+
+			-- Details being present indicates that this
+			-- disconnection was from an error.
+			if details ~= nil then
+				Log.warn("Disconnected from an error: {}", details)
+
+				self:setState({
+					appStatus = AppStatus.Error,
+					errorMessage = tostring(details),
+				})
+			else
+				self:setState({
+					appStatus = AppStatus.NotStarted,
+				})
+			end
+		end
+	end)
+
+	self.serveSession:start()
+end
+
+function App:render()
+	local children
+
+	if self.state.appStatus == AppStatus.NotStarted then
+		children = {
+			ConnectPanel = e(ConnectPanel, {
+				startSession = function(address, port)
+					self:startSession(address, port)
+				end,
+				cancel = function()
+					Log.trace("Canceling session configuration")
+
+					self:setState({
+						appStatus = AppStatus.NotStarted,
+					})
+				end,
+			}),
+		}
+	elseif self.state.appStatus == AppStatus.Connecting then
+		children = {
+			ConnectingPanel = Roact.createElement(ConnectingPanel),
+		}
+	elseif self.state.appStatus == AppStatus.Connected then
+		children = {
+			ConnectionActivePanel = e(ConnectionActivePanel, {
+				stopSession = function()
+					Log.trace("Disconnecting session")
+
+					self.serveSession:stop()
+					self.serveSession = nil
+					self:setState({
+						appStatus = AppStatus.NotStarted,
+					})
+
+					Log.trace("Session terminated by user")
+				end,
+			}),
+		}
+	elseif self.state.appStatus == AppStatus.Error then
+		children = {
+			ErrorPanel = Roact.createElement(ErrorPanel, {
+				errorMessage = self.state.errorMessage,
+				onDismiss = function()
+					self:setState({
+						appStatus = AppStatus.NotStarted,
+					})
+				end,
+			}),
+		}
+	end
+
+	return Roact.createElement(Roact.Portal, {
+		target = self.dockWidget,
+	}, children)
+end
+
+function App:didMount()
+	Log.trace("Rojo {} initializing", self.displayedVersion)
+
+	checkUpgrade(self.props.plugin)
+	preloadAssets()
+end
+
+function App:willUnmount()
+	if self.serveSession ~= nil then
+		self.serveSession:stop()
+		self.serveSession = nil
+	end
+
+	for _, signal in pairs(self.signals) do
+		signal:Disconnect()
+	end
+end
+
+return App

plugin/src/Components/ConnectPanel.lua

@@ -0,0 +1,161 @@
+local Rojo = script:FindFirstAncestor("Rojo")
+local Plugin = Rojo.Plugin
+
+local Roact = require(Rojo.Roact)
+
+local Config = require(Plugin.Config)
+local Theme = require(Plugin.Theme)
+
+local Panel = require(Plugin.Components.Panel)
+local FitList = require(Plugin.Components.FitList)
+local FitText = require(Plugin.Components.FitText)
+local FormButton = require(Plugin.Components.FormButton)
+local FormTextInput = require(Plugin.Components.FormTextInput)
+
+local e = Roact.createElement
+
+local ConnectPanel = Roact.Component:extend("ConnectPanel")
+
+function ConnectPanel:init()
+	self:setState({
+		address = "",
+		port = "",
+	})
+end
+
+function ConnectPanel:render()
+	local startSession = self.props.startSession
+
+	return e(Panel, nil, {
+		Layout = e("UIListLayout", {
+			SortOrder = Enum.SortOrder.LayoutOrder,
+			HorizontalAlignment = Enum.HorizontalAlignment.Center,
+			VerticalAlignment = Enum.VerticalAlignment.Center,
+		}),
+
+		Inputs = e(FitList, {
+			containerProps = {
+				BackgroundTransparency = 1,
+				LayoutOrder = 1,
+			},
+			layoutProps = {
+				FillDirection = Enum.FillDirection.Horizontal,
+				Padding = UDim.new(0, 8),
+			},
+			paddingProps = {
+				PaddingTop = UDim.new(0, 20),
+				PaddingBottom = UDim.new(0, 10),
+				PaddingLeft = UDim.new(0, 24),
+				PaddingRight = UDim.new(0, 24),
+			},
+		}, {
+			Address = e(FitList, {
+				containerProps = {
+					LayoutOrder = 1,
+					BackgroundTransparency = 1,
+				},
+				layoutProps = {
+					Padding = UDim.new(0, 4),
+				},
+			}, {
+				Label = e(FitText, {
+					Kind = "TextLabel",
+					LayoutOrder = 1,
+					BackgroundTransparency = 1,
+					TextXAlignment = Enum.TextXAlignment.Left,
+					Font = Theme.TitleFont,
+					TextSize = 20,
+					Text = "Address",
+					TextColor3 = Theme.PrimaryColor,
+				}),
+
+				Input = e(FormTextInput, {
+					layoutOrder = 2,
+					width = UDim.new(0, 220),
+					value = self.state.address,
+					placeholderValue = Config.defaultHost,
+					onValueChange = function(newValue)
+						self:setState({
+							address = newValue,
+						})
+					end,
+				}),
+			}),
+
+			Port = e(FitList, {
+				containerProps = {
+					LayoutOrder = 2,
+					BackgroundTransparency = 1,
+				},
+				layoutProps = {
+					Padding = UDim.new(0, 4),
+				},
+			}, {
+				Label = e(FitText, {
+					Kind = "TextLabel",
+					LayoutOrder = 1,
+					BackgroundTransparency = 1,
+					TextXAlignment = Enum.TextXAlignment.Left,
+					Font = Theme.TitleFont,
+					TextSize = 20,
+					Text = "Port",
+					TextColor3 = Theme.PrimaryColor,
+				}),
+
+				Input = e(FormTextInput, {
+					layoutOrder = 2,
+					width = UDim.new(0, 80),
+					value = self.state.port,
+					placeholderValue = Config.defaultPort,
+					onValueChange = function(newValue)
+						self:setState({
+							port = newValue,
+						})
+					end,
+				}),
+			}),
+		}),
+
+		Buttons = e(FitList, {
+			fitAxes = "Y",
+			containerProps = {
+				BackgroundTransparency = 1,
+				LayoutOrder = 2,
+				Size = UDim2.new(1, 0, 0, 0),
+			},
+			layoutProps = {
+				FillDirection = Enum.FillDirection.Horizontal,
+				HorizontalAlignment = Enum.HorizontalAlignment.Right,
+				Padding = UDim.new(0, 8),
+			},
+			paddingProps = {
+				PaddingTop = UDim.new(0, 0),
+				PaddingBottom = UDim.new(0, 20),
+				PaddingLeft = UDim.new(0, 24),
+				PaddingRight = UDim.new(0, 24),
+			},
+		}, {
+			e(FormButton, {
+				layoutOrder = 2,
+				text = "Connect",
+				onClick = function()
+					if startSession ~= nil then
+						local address = self.state.address
+						if address:len() == 0 then
+							address = Config.defaultHost
+						end
+
+						local port = self.state.port
+						if port:len() == 0 then
+							port = Config.defaultPort
+						end
+
+						startSession(address, port)
+					end
+				end,
+			}),
+		}),
+	})
+end
+
+return ConnectPanel

plugin/src/Components/ConnectingPanel.lua

@@ -0,0 +1,34 @@
+local Roact = require(script:FindFirstAncestor("Rojo").Roact)
+
+local Plugin = script:FindFirstAncestor("Plugin")
+
+local Theme = require(Plugin.Theme)
+
+local Panel = require(Plugin.Components.Panel)
+local FitText = require(Plugin.Components.FitText)
+
+local e = Roact.createElement
+
+local ConnectingPanel = Roact.Component:extend("ConnectingPanel")
+
+function ConnectingPanel:render()
+	return e(Panel, nil, {
+		Layout = Roact.createElement("UIListLayout", {
+			HorizontalAlignment = Enum.HorizontalAlignment.Center,
+			VerticalAlignment = Enum.VerticalAlignment.Center,
+			SortOrder = Enum.SortOrder.LayoutOrder,
+			Padding = UDim.new(0, 8),
+		}),
+
+		Text = e(FitText, {
+			Padding = Vector2.new(12, 6),
+			Font = Theme.ButtonFont,
+			TextSize = 18,
+			Text = "Connecting...",
+			TextColor3 = Theme.PrimaryColor,
+			BackgroundTransparency = 1,
+		}),
+	})
+end
+
+return ConnectingPanel

plugin/src/Components/ConnectionActivePanel.lua

@@ -0,0 +1,46 @@
+local Roact = require(script:FindFirstAncestor("Rojo").Roact)
+
+local Plugin = script:FindFirstAncestor("Plugin")
+
+local Theme = require(Plugin.Theme)
+
+local Panel = require(Plugin.Components.Panel)
+local FitText = require(Plugin.Components.FitText)
+local FormButton = require(Plugin.Components.FormButton)
+
+local e = Roact.createElement
+
+local ConnectionActivePanel = Roact.Component:extend("ConnectionActivePanel")
+
+function ConnectionActivePanel:render()
+	local stopSession = self.props.stopSession
+
+	return e(Panel, nil, {
+		Layout = Roact.createElement("UIListLayout", {
+			HorizontalAlignment = Enum.HorizontalAlignment.Center,
+			VerticalAlignment = Enum.VerticalAlignment.Center,
+			SortOrder = Enum.SortOrder.LayoutOrder,
+			Padding = UDim.new(0, 8),
+		}),
+
+		Text = e(FitText, {
+			Padding = Vector2.new(12, 6),
+			Font = Theme.ButtonFont,
+			TextSize = 18,
+			Text = "Connected to Live-Sync Server",
+			TextColor3 = Theme.PrimaryColor,
+			BackgroundTransparency = 1,
+		}),
+
+		DisconnectButton = e(FormButton, {
+			layoutOrder = 2,
+			text = "Disconnect",
+			secondary = true,
+			onClick = function()
+				stopSession()
+			end,
+		}),
+	})
+end
+
+return ConnectionActivePanel

plugin/src/Components/ErrorPanel.lua

@@ -0,0 +1,69 @@
+local Roact = require(script:FindFirstAncestor("Rojo").Roact)
+
+local Plugin = script:FindFirstAncestor("Plugin")
+
+local Theme = require(Plugin.Theme)
+
+local Panel = require(Plugin.Components.Panel)
+local FitText = require(Plugin.Components.FitText)
+local FitScrollingFrame = require(Plugin.Components.FitScrollingFrame)
+local FormButton = require(Plugin.Components.FormButton)
+
+local e = Roact.createElement
+
+local BUTTON_HEIGHT = 60
+local HOR_PADDING = 8
+
+local ErrorPanel = Roact.Component:extend("ErrorPanel")
+
+function ErrorPanel:render()
+	local errorMessage = self.props.errorMessage
+	local onDismiss = self.props.onDismiss
+
+	return e(Panel, nil, {
+		Layout = Roact.createElement("UIListLayout", {
+			HorizontalAlignment = Enum.HorizontalAlignment.Center,
+			VerticalAlignment = Enum.VerticalAlignment.Center,
+			SortOrder = Enum.SortOrder.LayoutOrder,
+			Padding = UDim.new(0, 8),
+		}),
+
+		ErrorContainer = e(FitScrollingFrame, {
+			containerProps = {
+				BackgroundTransparency = 1,
+				BorderSizePixel = 0,
+				Size = UDim2.new(1, -HOR_PADDING * 2, 1, -BUTTON_HEIGHT),
+				Position = UDim2.new(0, HOR_PADDING, 0, 0),
+				ScrollBarImageColor3 = Theme.PrimaryColor,
+				VerticalScrollBarInset = Enum.ScrollBarInset.ScrollBar,
+				ScrollingDirection = Enum.ScrollingDirection.Y,
+			},
+		}, {
+			Text = e(FitText, {
+				Size = UDim2.new(1, 0, 0, 0),
+
+				LayoutOrder = 1,
+				TextXAlignment = Enum.TextXAlignment.Left,
+				TextYAlignment = Enum.TextYAlignment.Top,
+				FitAxis = "Y",
+				Font = Theme.ButtonFont,
+				TextSize = 18,
+				Text = errorMessage,
+				TextWrap = true,
+				TextColor3 = Theme.PrimaryColor,
+				BackgroundTransparency = 1,
+			}),
+		}),
+
+		DismissButton = e(FormButton, {
+			layoutOrder = 2,
+			text = "Dismiss",
+			secondary = true,
+			onClick = function()
+				onDismiss()
+			end,
+		}),
+	})
+end
+
+return ErrorPanel

plugin/src/Components/FitList.lua

@@ -0,0 +1,63 @@
+local Roact = require(script:FindFirstAncestor("Rojo").Roact)
+
+local Dictionary = require(script.Parent.Parent.Dictionary)
+
+local e = Roact.createElement
+
+local FitList = Roact.Component:extend("FitList")
+
+function FitList:init()
+	self.sizeBinding, self.setSize = Roact.createBinding(UDim2.new())
+end
+
+function FitList:render()
+	local containerKind = self.props.containerKind or "Frame"
+	local fitAxes = self.props.fitAxes or "XY"
+	local containerProps = self.props.containerProps
+	local layoutProps = self.props.layoutProps
+	local paddingProps = self.props.paddingProps
+
+	local padding
+	if paddingProps ~= nil then
+		padding = e("UIPadding", paddingProps)
+	end
+
+	local children = Dictionary.merge(self.props[Roact.Children], {
+		["$Layout"] = e("UIListLayout", Dictionary.merge({
+			SortOrder = Enum.SortOrder.LayoutOrder,
+			[Roact.Change.AbsoluteContentSize] = function(instance)
+				local contentSize = instance.AbsoluteContentSize
+
+				if paddingProps ~= nil then
+					contentSize = contentSize + Vector2.new(
+						paddingProps.PaddingLeft.Offset + paddingProps.PaddingRight.Offset,
+						paddingProps.PaddingTop.Offset + paddingProps.PaddingBottom.Offset)
+				end
+
+				local combinedSize
+
+				if fitAxes == "X" then
+					combinedSize = UDim2.new(0, contentSize.X, containerProps.Size.Y.Scale, containerProps.Size.Y.Offset)
+				elseif fitAxes == "Y" then
+					combinedSize = UDim2.new(containerProps.Size.X.Scale, containerProps.Size.X.Offset, 0, contentSize.Y)
+				elseif fitAxes == "XY" then
+					combinedSize = UDim2.new(0, contentSize.X, 0, contentSize.Y)
+				else
+					error("Invalid fitAxes value")
+				end
+
+				self.setSize(combinedSize)
+			end,
+		}, layoutProps)),
+
+		["$Padding"] = padding,
+	})
+
+	local fullContainerProps = Dictionary.merge(containerProps, {
+		Size = self.sizeBinding,
+	})
+
+	return e(containerKind, fullContainerProps, children)
+end
+
+return FitList

plugin/src/Components/FitScrollingFrame.lua

@@ -0,0 +1,33 @@
+local Roact = require(script:FindFirstAncestor("Rojo").Roact)
+
+local Dictionary = require(script.Parent.Parent.Dictionary)
+
+local e = Roact.createElement
+
+local FitScrollingFrame = Roact.Component:extend("FitScrollingFrame")
+
+function FitScrollingFrame:init()
+	self.sizeBinding, self.setSize = Roact.createBinding(UDim2.new())
+end
+
+function FitScrollingFrame:render()
+	local containerProps = self.props.containerProps
+	local layoutProps = self.props.layoutProps
+
+	local children = Dictionary.merge(self.props[Roact.Children], {
+		["$Layout"] = e("UIListLayout", Dictionary.merge({
+			SortOrder = Enum.SortOrder.LayoutOrder,
+			[Roact.Change.AbsoluteContentSize] = function(instance)
+				self.setSize(UDim2.new(0, 0, 0, instance.AbsoluteContentSize.Y))
+			end,
+		}, layoutProps)),
+	})
+
+	local fullContainerProps = Dictionary.merge(containerProps, {
+		CanvasSize = self.sizeBinding,
+	})
+
+	return e("ScrollingFrame", fullContainerProps, children)
+end
+
+return FitScrollingFrame

plugin/src/Components/FitText.lua

@@ -0,0 +1,88 @@
+local TextService = game:GetService("TextService")
+
+local Roact = require(script:FindFirstAncestor("Rojo").Roact)
+
+local Dictionary = require(script.Parent.Parent.Dictionary)
+
+local e = Roact.createElement
+
+local FitText = Roact.Component:extend("FitText")
+
+function FitText:init()
+	self.ref = Roact.createRef()
+	self.sizeBinding, self.setSize = Roact.createBinding(UDim2.new())
+end
+
+function FitText:render()
+	local kind = self.props.Kind or "TextLabel"
+
+	local containerProps = Dictionary.merge(self.props, {
+		FitAxis = Dictionary.None,
+		Kind = Dictionary.None,
+		Padding = Dictionary.None,
+		MinSize = Dictionary.None,
+		Size = self.sizeBinding,
+		[Roact.Ref] = self.ref,
+		[Roact.Change.AbsoluteSize] = function()
+			self:updateTextMeasurements()
+		end
+	})
+
+	return e(kind, containerProps)
+end
+
+function FitText:didMount()
+	self:updateTextMeasurements()
+end
+
+function FitText:didUpdate()
+	self:updateTextMeasurements()
+end
+
+function FitText:updateTextMeasurements()
+	local minSize = self.props.MinSize or Vector2.new(0, 0)
+	local padding = self.props.Padding or Vector2.new(0, 0)
+	local fitAxis = self.props.FitAxis or "XY"
+	local baseSize = self.props.Size
+
+	local text = self.props.Text or ""
+	local font = self.props.Font or Enum.Font.Legacy
+	local textSize = self.props.TextSize or 12
+
+	local containerSize = self.ref.current.AbsoluteSize
+
+	local textBounds
+
+	if fitAxis == "XY" then
+		textBounds = Vector2.new(9e6, 9e6)
+	elseif fitAxis == "X" then
+		textBounds = Vector2.new(9e6, containerSize.Y - padding.Y * 2)
+	elseif fitAxis == "Y" then
+		textBounds = Vector2.new(containerSize.X - padding.X * 2, 9e6)
+	end
+
+	local measuredText = TextService:GetTextSize(text, textSize, font, textBounds)
+
+	local computedX = math.max(minSize.X, padding.X * 2 + measuredText.X)
+	local computedY = math.max(minSize.Y, padding.Y * 2 + measuredText.Y)
+
+	local totalSize
+
+	if fitAxis == "XY" then
+		totalSize = UDim2.new(
+			0, computedX,
+			0, computedY)
+	elseif fitAxis == "X" then
+		totalSize = UDim2.new(
+			0, computedX,
+			baseSize.Y.Scale, baseSize.Y.Offset)
+	elseif fitAxis == "Y" then
+		totalSize = UDim2.new(
+			baseSize.X.Scale, baseSize.X.Offset,
+			0, computedY)
+	end
+
+	self.setSize(totalSize)
+end
+
+return FitText

plugin/src/Components/FormButton.lua

@@ -0,0 +1,62 @@
+local Rojo = script:FindFirstAncestor("Rojo")
+local Plugin = Rojo.Plugin
+
+local Roact = require(Rojo.Roact)
+
+local Assets = require(Plugin.Assets)
+local Theme = require(Plugin.Theme)
+local FitList = require(Plugin.Components.FitList)
+local FitText = require(Plugin.Components.FitText)
+
+local e = Roact.createElement
+
+local RoundBox = Assets.Slices.RoundBox
+
+local function FormButton(props)
+	local text = props.text
+	local layoutOrder = props.layoutOrder
+	local onClick = props.onClick
+
+	local textColor
+	local backgroundColor
+
+	if props.secondary then
+		textColor = Theme.AccentColor
+		backgroundColor = Theme.SecondaryColor
+	else
+		textColor = Theme.SecondaryColor
+		backgroundColor = Theme.AccentColor
+	end
+
+	return e(FitList, {
+		containerKind = "ImageButton",
+		containerProps = {
+			LayoutOrder = layoutOrder,
+			BackgroundTransparency = 1,
+			Image = RoundBox.asset,
+			ImageRectOffset = RoundBox.offset,
+			ImageRectSize = RoundBox.size,
+			SliceCenter = RoundBox.center,
+			ScaleType = Enum.ScaleType.Slice,
+			ImageColor3 = backgroundColor,
+
+			[Roact.Event.Activated] = function()
+				if onClick ~= nil then
+					onClick()
+				end
+			end,
+		},
+	}, {
+		Text = e(FitText, {
+			Kind = "TextLabel",
+			Text = text,
+			TextSize = 18,
+			TextColor3 = textColor,
+			Font = Theme.ButtonFont,
+			Padding = Vector2.new(16, 8),
+			BackgroundTransparency = 1,
+		}),
+	})
+end
+
+return FormButton

plugin/src/Components/FormTextInput.lua

@@ -0,0 +1,80 @@
+local Rojo = script:FindFirstAncestor("Rojo")
+local Plugin = Rojo.Plugin
+
+local Roact = require(Rojo.Roact)
+
+local Assets = require(Plugin.Assets)
+local Theme = require(Plugin.Theme)
+
+local e = Roact.createElement
+
+local RoundBox = Assets.Slices.RoundBox
+
+local TEXT_SIZE = 22
+local PADDING = 8
+
+local FormTextInput = Roact.Component:extend("FormTextInput")
+
+function FormTextInput:init()
+	self:setState({
+		focused = false,
+	})
+end
+
+function FormTextInput:render()
+	local value = self.props.value
+	local placeholderValue = self.props.placeholderValue
+	local onValueChange = self.props.onValueChange
+	local layoutOrder = self.props.layoutOrder
+	local width = self.props.width
+
+	local shownPlaceholder
+	if self.state.focused then
+		shownPlaceholder = ""
+	else
+		shownPlaceholder = placeholderValue
+	end
+
+	return e("ImageLabel", {
+		LayoutOrder = layoutOrder,
+		Image = RoundBox.asset,
+		ImageRectOffset = RoundBox.offset,
+		ImageRectSize = RoundBox.size,
+		ScaleType = Enum.ScaleType.Slice,
+		SliceCenter = RoundBox.center,
+		ImageColor3 = Theme.SecondaryColor,
+		Size = UDim2.new(width.Scale, width.Offset, 0, TEXT_SIZE + PADDING * 2),
+		BackgroundTransparency = 1,
+	}, {
+		InputInner = e("TextBox", {
+			BackgroundTransparency = 1,
+			Size = UDim2.new(1, -PADDING * 2, 1, -PADDING * 2),
+			Position = UDim2.new(0.5, 0, 0.5, 0),
+			AnchorPoint = Vector2.new(0.5, 0.5),
+			Font = Theme.InputFont,
+			ClearTextOnFocus = false,
+			TextXAlignment = Enum.TextXAlignment.Center,
+			TextSize = TEXT_SIZE,
+			Text = value,
+			PlaceholderText = shownPlaceholder,
+			PlaceholderColor3 = Theme.LightTextColor,
+			TextColor3 = Theme.PrimaryColor,
+
+			[Roact.Change.Text] = function(rbx)
+				onValueChange(rbx.Text)
+			end,
+			[Roact.Event.Focused] = function()
+				self:setState({
+					focused = true,
+				})
+			end,
+			[Roact.Event.FocusLost] = function()
+				self:setState({
+					focused = false,
+				})
+			end,
+		}),
+	})
+end
+
+return FormTextInput

plugin/src/Components/Panel.lua

@@ -0,0 +1,34 @@
+local Roact = require(script:FindFirstAncestor("Rojo").Roact)
+
+local Plugin = script:FindFirstAncestor("Plugin")
+
+local RojoFooter = require(Plugin.Components.RojoFooter)
+
+local e = Roact.createElement
+
+local Panel = Roact.Component:extend("Panel")
+
+function Panel:init()
+	self.footerSize, self.setFooterSize = Roact.createBinding(Vector2.new())
+end
+
+function Panel:render()
+	return e("Frame", {
+		Size = UDim2.new(1, 0, 1, 0),
+		BackgroundTransparency = 1,
+	}, {
+		Layout = Roact.createElement("UIListLayout", {
+			HorizontalAlignment = Enum.HorizontalAlignment.Center,
+			SortOrder = Enum.SortOrder.LayoutOrder,
+		}),
+
+		Body = e("Frame", {
+			Size = UDim2.new(0, 360, 1, -32),
+			BackgroundTransparency = 1,
+		}, self.props[Roact.Children]),
+
+		Footer = e(RojoFooter),
+	})
+end
+
+return Panel

plugin/src/Components/RojoFooter.lua

@@ -0,0 +1,67 @@
+local Rojo = script:FindFirstAncestor("Rojo")
+local Plugin = Rojo.Plugin
+
+local Roact = require(Rojo.Roact)
+
+local Config = require(Plugin.Config)
+local Version = require(Plugin.Version)
+local Assets = require(Plugin.Assets)
+local Theme = require(Plugin.Theme)
+
+local e = Roact.createElement
+
+local RojoFooter = Roact.Component:extend("RojoFooter")
+
+function RojoFooter:init()
+	self.footerSize, self.setFooterSize = Roact.createBinding(Vector2.new())
+	self.footerVersionSize, self.setFooterVersionSize = Roact.createBinding(Vector2.new())
+end
+
+function RojoFooter:render()
+	return e("Frame", {
+		LayoutOrder = 3,
+		Size = UDim2.new(1, 0, 0, 32),
+		BackgroundColor3 = Theme.SecondaryColor,
+		BorderSizePixel = 0,
+	}, {
+		Padding = e("UIPadding", {
+			PaddingTop = UDim.new(0, 4),
+			PaddingBottom = UDim.new(0, 4),
+			PaddingLeft = UDim.new(0, 8),
+			PaddingRight = UDim.new(0, 8),
+		}),
+
+		LogoContainer = e("Frame", {
+			BackgroundTransparency = 1,
+
+			Size = UDim2.new(0, 0, 0, 32),
+		}, {
+			Logo = e("ImageLabel", {
+				Image = Assets.Images.Logo,
+				Size = UDim2.new(0, 80, 0, 40),
+				ScaleType = Enum.ScaleType.Fit,
+				BackgroundTransparency = 1,
+				Position = UDim2.new(0, 0, 1, -10),
+				AnchorPoint = Vector2.new(0, 1),
+			}),
+		}),
+
+		Version = e("TextLabel", {
+			Position = UDim2.new(1, 0, 0, 0),
+			Size = UDim2.new(0, 0, 1, 0),
+			AnchorPoint = Vector2.new(1, 0),
+			Font = Theme.TitleFont,
+			TextSize = 18,
+			Text = Version.display(Config.version),
+			TextXAlignment = Enum.TextXAlignment.Right,
+			TextColor3 = Theme.LightTextColor,
+			BackgroundTransparency = 1,
+
+			[Roact.Change.AbsoluteSize] = function(rbx)
+				self.setFooterVersionSize(rbx.AbsoluteSize)
+			end,
+		}),
+	})
+end
+
+return RojoFooter

plugin/src/Config.lua

@@ -1,12 +1,13 @@
-return {
-	pollingRate = 0.2,
-	version = {0, 4, 8},
-	expectedServerVersionString = "0.4.x",
-	protocolVersion = 1,
-	icons = {
-		syncIn = "rbxassetid://1820320573",
-		togglePolling = "rbxassetid://1820320064",
-		testConnection = "rbxassetid://1820320989",
-	},
-	dev = false,
-}
+local strict = require(script.Parent.strict)
+
+local isDevBuild = script.Parent.Parent:FindFirstChild("ROJO_DEV_BUILD") ~= nil
+
+return strict("Config", {
+	isDevBuild = isDevBuild,
+	codename = "Epiphany",
+	version = {0, 6, 0, "-alpha.2"},
+	expectedServerVersionString = "0.6.0 or newer",
+	protocolVersion = 3,
+	defaultHost = "localhost",
+	defaultPort = 34872,
+})

plugin/src/Config.spec.lua

@@ -1,7 +0,0 @@
-return function()
-	local Config = require(script.Parent.Config)
-
-	it("should have 'dev' disabled", function()
-		expect(Config.dev).to.equal(false)
-	end)
-end

plugin/src/DevSettings.lua

@@ -0,0 +1,151 @@
+local Config = require(script.Parent.Config)
+
+local Environment = {
+	User = "User",
+	Dev = "Dev",
+	Test = "Test",
+}
+
+local DEFAULT_ENVIRONMENT = Config.isDevBuild and Environment.Dev or Environment.User
+
+local VALUES = {
+	LogLevel = {
+		type = "IntValue",
+		values = {
+			[Environment.User] = 2,
+			[Environment.Dev] = 4,
+			[Environment.Test] = 4,
+		},
+	},
+	TypecheckingEnabled = {
+		type = "BoolValue",
+		values = {
+			[Environment.User] = false,
+			[Environment.Dev] = true,
+			[Environment.Test] = true,
+		},
+	},
+	UnstableTwoWaySync = {
+		type = "BoolValue",
+		values = {
+			[Environment.User] = false,
+			[Environment.Dev] = false,
+			[Environment.Test] = false,
+		},
+	},
+}
+
+local CONTAINER_NAME = "RojoDevSettings" .. Config.codename
+
+local function getValueContainer()
+	return game:FindFirstChild(CONTAINER_NAME)
+end
+
+local valueContainer = getValueContainer()
+
+game.ChildAdded:Connect(function(child)
+	local success, name = pcall(function()
+		return child.Name
+	end)
+
+	if success and name == CONTAINER_NAME then
+		valueContainer = child
+	end
+end)
+
+local function getStoredValue(name)
+	if valueContainer == nil then
+		return nil
+	end
+
+	local valueObject = valueContainer:FindFirstChild(name)
+
+	if valueObject == nil then
+		return nil
+	end
+
+	return valueObject.Value
+end
+
+local function setStoredValue(name, kind, value)
+	local object = valueContainer:FindFirstChild(name)
+
+	if object == nil then
+		object = Instance.new(kind)
+		object.Name = name
+		object.Parent = valueContainer
+	end
+
+	object.Value = value
+end
+
+local function createAllValues(environment)
+	assert(Environment[environment] ~= nil, "Invalid environment")
+
+	valueContainer = getValueContainer()
+
+	if valueContainer == nil then
+		valueContainer = Instance.new("Folder")
+		valueContainer.Name = CONTAINER_NAME
+		valueContainer.Parent = game
+	end
+
+	for name, value in pairs(VALUES) do
+		setStoredValue(name, value.type, value.values[environment])
+	end
+end
+
+local function getValue(name)
+	assert(VALUES[name] ~= nil, "Invalid DevSettings name")
+
+	local stored = getStoredValue(name)
+
+	if stored ~= nil then
+		return stored
+	end
+
+	return VALUES[name].values[DEFAULT_ENVIRONMENT]
+end
+
+local DevSettings = {}
+
+function DevSettings:createDevSettings()
+	createAllValues(Environment.Dev)
+end
+
+function DevSettings:createTestSettings()
+	createAllValues(Environment.Test)
+end
+
+function DevSettings:hasChangedValues()
+	return valueContainer ~= nil
+end
+
+function DevSettings:resetValues()
+	if valueContainer then
+		valueContainer:Destroy()
+		valueContainer = nil
+	end
+end
+
+function DevSettings:isEnabled()
+	return valueContainer ~= nil
+end
+
+function DevSettings:getLogLevel()
+	return getValue("LogLevel")
+end
+
+function DevSettings:shouldTypecheck()
+	return getValue("TypecheckingEnabled")
+end
+
+function DevSettings:twoWaySyncEnabled()
+	return getValue("UnstableTwoWaySync")
+end
+
+function _G.ROJO_DEV_CREATE()
+	DevSettings:createDevSettings()
+end
+
+return DevSettings

plugin/src/Dictionary.lua

@@ -0,0 +1,33 @@
+--[[
+	This is a placeholder module waiting for Cryo to become available.
+]]
+
+local None = newproxy(true)
+getmetatable(None).__tostring = function()
+	return "None"
+end
+
+local function merge(...)
+	local output = {}
+
+	for i = 1, select("#", ...) do
+		local source = select(i, ...)
+
+		if source ~= nil then
+			for key, value in pairs(source) do
+				if value == None then
+					output[key] = nil
+				else
+					output[key] = value
+				end
+			end
+		end
+	end
+
+	return output
+end
+
+return {
+	None = None,
+	merge = merge,
+}

plugin/src/Http.lua

@@ -1,68 +0,0 @@
-local HttpService = game:GetService("HttpService")
-
-local HTTP_DEBUG = false
-
-local Promise = require(script.Parent.Parent.modules.Promise)
-
-local HttpError = require(script.Parent.HttpError)
-local HttpResponse = require(script.Parent.HttpResponse)
-
-local function dprint(...)
-	if HTTP_DEBUG then
-		print(...)
-	end
-end
-
-local Http = {}
-Http.__index = Http
-
-function Http.new(baseUrl)
-	assert(type(baseUrl) == "string", "Http.new needs a baseUrl!")
-
-	local http = {
-		baseUrl = baseUrl
-	}
-
-	setmetatable(http, Http)
-
-	return http
-end
-
-function Http:get(endpoint)
-	dprint("\nGET", endpoint)
-	return Promise.new(function(resolve, reject)
-		spawn(function()
-			local ok, result = pcall(function()
-				return HttpService:GetAsync(self.baseUrl .. endpoint, true)
-			end)
-
-			if ok then
-				dprint("\t", result, "\n")
-				resolve(HttpResponse.new(result))
-			else
-				reject(HttpError.fromErrorString(result))
-			end
-		end)
-	end)
-end
-
-function Http:post(endpoint, body)
-	dprint("\nPOST", endpoint)
-	dprint(body)
-	return Promise.new(function(resolve, reject)
-		spawn(function()
-			local ok, result = pcall(function()
-				return HttpService:PostAsync(self.baseUrl .. endpoint, body)
-			end)
-
-			if ok then
-				dprint("\t", result, "\n")
-				resolve(HttpResponse.new(result))
-			else
-				reject(HttpError.fromErrorString(result))
-			end
-		end)
-	end)
-end
-
-return Http

plugin/src/HttpError.lua

@@ -1,60 +0,0 @@
-local HttpError = {}
-HttpError.__index = HttpError
-
-HttpError.Error = {
-	HttpNotEnabled = {
-		message = "Rojo requires HTTP access, which is not enabled.\n" ..
-			"Check your game settings, located in the 'Home' tab of Studio.",
-	},
-	ConnectFailed = {
-		message = "Rojo plugin couldn't connect to the Rojo server.\n" ..
-			"Make sure the server is running -- use 'Rojo serve' to run it!",
-	},
-	Unknown = {
-		message = "Rojo encountered an unknown error: {{message}}",
-	},
-}
-
-function HttpError.new(type, extraMessage)
-	extraMessage = extraMessage or ""
-	local message = type.message:gsub("{{message}}", extraMessage)
-
-	local err = {
-		type = type,
-		message = message,
-	}
-
-	setmetatable(err, HttpError)
-
-	return err
-end
-
-function HttpError:__tostring()
-	return self.message
-end
-
---[[
-	This method shouldn't have to exist. Ugh.
-]]
-function HttpError.fromErrorString(err)
-	err = err:lower()
-
-	if err:find("^http requests are not enabled") then
-		return HttpError.new(HttpError.Error.HttpNotEnabled)
-	end
-
-	if err:find("^curl error") then
-		return HttpError.new(HttpError.Error.ConnectFailed)
-	end
-
-	return HttpError.new(HttpError.Error.Unknown, err)
-end
-
-function HttpError:report()
-	warn(self.message)
-	if self.type == HttpError.Error.HttpNotEnabled then
-		game:GetService("Selection"):Set{game:GetService("HttpService")}
-	end
-end
-
-return HttpError

plugin/src/HttpResponse.lua

@@ -1,20 +0,0 @@
-local HttpService = game:GetService("HttpService")
-
-local HttpResponse = {}
-HttpResponse.__index = HttpResponse
-
-function HttpResponse.new(body)
-	local response = {
-		body = body,
-	}
-
-	setmetatable(response, HttpResponse)
-
-	return response
-end
-
-function HttpResponse:json()
-	return HttpService:JSONDecode(self.body)
-end
-
-return HttpResponse

plugin/src/InstanceMap.lua

@@ -0,0 +1,177 @@
+local Log = require(script.Parent.Parent.Log)
+
+--[[
+	A bidirectional map between instance IDs and Roblox instances. It lets us
+	keep track of every instance we know about.
+
+	TODO: Track ancestry to catch when stuff moves?
+]]
+local InstanceMap = {}
+InstanceMap.__index = InstanceMap
+
+function InstanceMap.new(onInstanceChanged)
+	local self = {
+		fromIds = {},
+		fromInstances = {},
+		instancesToSignal = {},
+		onInstanceChanged = onInstanceChanged,
+	}
+
+	return setmetatable(self, InstanceMap)
+end
+
+--[[
+	Disconnect all connections and release all instance references.
+]]
+function InstanceMap:stop()
+	-- I think this is safe.
+	for instance in pairs(self.fromInstances) do
+		self:removeInstance(instance)
+	end
+end
+
+function InstanceMap:__fmtDebug(output)
+	output:writeLine("InstanceMap {{")
+	output:indent()
+
+	-- Collect all of the entries in the InstanceMap and sort them by their
+	-- label, which helps make our output deterministic.
+	local entries = {}
+	for id, instance in pairs(self.fromIds) do
+		local label = string.format("%s (%s)", instance:GetFullName(), instance.ClassName)
+
+		table.insert(entries, {id, label})
+	end
+
+	table.sort(entries, function(a, b)
+		return a[2] < b[2]
+	end)
+
+	for _, entry in ipairs(entries) do
+		output:writeLine("{}: {}", entry[1], entry[2])
+	end
+
+	output:unindent()
+	output:write("}")
+end
+
+function InstanceMap:insert(id, instance)
+	self.fromIds[id] = instance
+	self.fromInstances[instance] = id
+	self:__connectSignals(instance)
+end
+
+function InstanceMap:removeId(id)
+	local instance = self.fromIds[id]
+
+	if instance ~= nil then
+		self:__disconnectSignals(instance)
+		self.fromIds[id] = nil
+		self.fromInstances[instance] = nil
+	else
+		Log.warn("Attempted to remove nonexistant ID {}", id)
+	end
+end
+
+function InstanceMap:removeInstance(instance)
+	local id = self.fromInstances[instance]
+	self:__disconnectSignals(instance)
+
+	if id ~= nil then
+		self.fromInstances[instance] = nil
+		self.fromIds[id] = nil
+	else
+		Log.warn("Attempted to remove nonexistant instance {}", instance)
+	end
+end
+
+function InstanceMap:destroyInstance(instance)
+	local id = self.fromInstances[instance]
+
+	if id ~= nil then
+		self:destroyId(id)
+	else
+		Log.warn("Attempted to destroy untracked instance {}", instance)
+	end
+end
+
+function InstanceMap:destroyId(id)
+	local instance = self.fromIds[id]
+	self:removeId(id)
+
+	if instance ~= nil then
+		local descendantsToDestroy = {}
+
+		for otherInstance in pairs(self.fromInstances) do
+			if otherInstance:IsDescendantOf(instance) then
+				table.insert(descendantsToDestroy, otherInstance)
+			end
+		end
+
+		for _, otherInstance in ipairs(descendantsToDestroy) do
+			self:removeInstance(otherInstance)
+		end
+
+		instance:Destroy()
+	else
+		Log.warn("Attempted to destroy nonexistant ID {}", id)
+	end
+end
+
+function InstanceMap:__connectSignals(instance)
+	-- ValueBase instances have an overriden version of the Changed signal that
+	-- only detects changes to their Value property.
+	--
+	-- We can instead connect listener to each individual property that we care
+	-- about on those objects (Name and Value) to emulate the same idea.
+	if instance:IsA("ValueBase") then
+		local signals = {
+			instance:GetPropertyChangedSignal("Name"):Connect(function()
+				self:__maybeFireInstanceChanged(instance, "Name")
+			end),
+
+			instance:GetPropertyChangedSignal("Value"):Connect(function()
+				self:__maybeFireInstanceChanged(instance, "Value")
+			end),
+
+			instance:GetPropertyChangedSignal("Parent"):Connect(function()
+				self:__maybeFireInstanceChanged(instance, "Parent")
+			end),
+		}
+
+		self.instancesToSignal[instance] = signals
+	else
+		self.instancesToSignal[instance] = instance.Changed:Connect(function(propertyName)
+			self:__maybeFireInstanceChanged(instance, propertyName)
+		end)
+	end
+end
+
+function InstanceMap:__maybeFireInstanceChanged(instance, propertyName)
+	Log.trace("{}.{} changed", instance:GetFullName(), propertyName)
+
+	if self.onInstanceChanged ~= nil then
+		self.onInstanceChanged(instance, propertyName)
+	end
+end
+
+function InstanceMap:__disconnectSignals(instance)
+	local signals = self.instancesToSignal[instance]
+
+	if signals ~= nil then
+		-- In most cases, we only have a single signal, so we avoid keeping
+		-- around the extra table. ValueBase objects force us to use multiple
+		-- signals to emulate the Instance.Changed event, however.
+		if typeof(signals) == "table" then
+			for _, signal in ipairs(signals) do
+				signal:Disconnect()
+			end
+		else
+			signals:Disconnect()
+		end
+
+		self.instancesToSignal[instance] = nil
+	end
+end
+
+return InstanceMap

plugin/src/Main.server.lua

@@ -1,79 +0,0 @@
-if not plugin then
-	return
-end
-
-local Plugin = require(script.Parent.Plugin)
-local Config = require(script.Parent.Config)
-local Version = require(script.Parent.Version)
-
---[[
-	Check if the user is using a newer version of Rojo than last time. If they
-	are, show them a reminder to make sure they check their server version.
-]]
-local function checkUpgrade()
-	-- When developing Rojo, there's no use in doing version checks
-	if Config.dev then
-		return
-	end
-
-	local lastVersion = plugin:GetSetting("LastRojoVersion")
-
-	if lastVersion then
-		local wasUpgraded = Version.compare(Config.version, lastVersion) == 1
-
-		if wasUpgraded then
-			local message = (
-				"\nRojo detected an upgrade from version %s to version %s." ..
-				"\nMake sure you have also upgraded your server!" ..
-				"\n\nRojo version %s is intended for use with server version %s.\n"
-			):format(
-				Version.display(lastVersion), Version.display(Config.version),
-				Version.display(Config.version), Config.expectedServerVersionString
-			)
-
-			print(message)
-		end
-	end
-
-	plugin:SetSetting("LastRojoVersion", Config.version)
-end
-
-local function main()
-	local pluginInstance = Plugin.new()
-
-	local displayedVersion = Config.dev and "DEV" or Version.display(Config.version)
-
-	local toolbar = plugin:CreateToolbar("Rojo Plugin " .. displayedVersion)
-
-	toolbar:CreateButton("Test Connection", "Connect to Rojo Server", Config.icons.testConnection)
-		.Click:Connect(function()
-			checkUpgrade()
-
-			pluginInstance:connect()
-				:catch(function(err)
-					warn(err)
-				end)
-		end)
-
-	toolbar:CreateButton("Sync In", "Sync into Roblox Studio", Config.icons.syncIn)
-		.Click:Connect(function()
-			checkUpgrade()
-
-			pluginInstance:syncIn()
-				:catch(function(err)
-					warn(err)
-				end)
-		end)
-
-	toolbar:CreateButton("Toggle Polling", "Poll server for changes", Config.icons.togglePolling)
-		.Click:Connect(function()
-			checkUpgrade()
-
-			pluginInstance:togglePolling()
-				:catch(function(err)
-					warn(err)
-				end)
-		end)
-end
-
-main()

plugin/src/Plugin.lua

@@ -1,303 +0,0 @@
-local CoreGui = game:GetService("CoreGui")
-
-local Promise = require(script.Parent.Parent.modules.Promise)
-
-local Config = require(script.Parent.Config)
-local Http = require(script.Parent.Http)
-local Api = require(script.Parent.Api)
-local Reconciler = require(script.Parent.Reconciler)
-local Version = require(script.Parent.Version)
-
-local function collectMatch(source, pattern)
-	local result = {}
-
-	for match in source:gmatch(pattern) do
-		table.insert(result, match)
-	end
-
-	return result
-end
-
-local Plugin = {}
-Plugin.__index = Plugin
-
-function Plugin.new()
-	local address = "localhost"
-	local port = Config.dev and 8001 or 8000
-
-	local remote = ("http://%s:%d"):format(address, port)
-
-	local self = {
-		_http = Http.new(remote),
-		_reconciler = Reconciler.new(),
-		_api = nil,
-		_polling = false,
-		_syncInProgress = false,
-	}
-
-	setmetatable(self, Plugin)
-
-	do
-		local uiName = ("Rojo %s UI"):format(Version.display(Config.version))
-
-		if Config.dev then
-			uiName = "Rojo Dev UI"
-		end
-
-		-- If there's an existing Rojo UI, like from a Roblox plugin upgrade
-		-- that wasn't Rojo, make sure we clean it up.
-		local existingUi = CoreGui:FindFirstChild(uiName)
-
-		if existingUi ~= nil then
-			existingUi:Destroy()
-		end
-
-		local screenGui = Instance.new("ScreenGui")
-		screenGui.Name = uiName
-		screenGui.Parent = CoreGui
-		screenGui.DisplayOrder = -1
-		screenGui.Enabled = false
-
-		local label = Instance.new("TextLabel")
-		label.Font = Enum.Font.SourceSans
-		label.TextSize = 20
-		label.Text = "Rojo polling..."
-		label.BackgroundColor3 = Color3.fromRGB(31, 31, 31)
-		label.BackgroundTransparency = 0.5
-		label.BorderSizePixel = 0
-		label.TextColor3 = Color3.new(1, 1, 1)
-		label.Size = UDim2.new(0, 120, 0, 28)
-		label.Position = UDim2.new(0, 0, 0, 0)
-		label.Parent = screenGui
-
-		self._label = screenGui
-
-		-- If our UI was destroyed, we assume it was from another instance of
-		-- the Rojo plugin coming online.
-		--
-		-- Roblox doesn't notify plugins when they get unloaded, so this is the
-		-- best trigger we have right now unless we create a dedicated event
-		-- object.
-		screenGui.AncestryChanged:Connect(function(_, parent)
-			if parent == nil then
-				self:restart()
-			end
-		end)
-	end
-
-	return self
-end
-
---[[
-	Clears all state and issues a notice to the user that the plugin has
-	restarted.
-]]
-function Plugin:restart()
-	warn("Rojo: The server has changed since the last request, reloading plugin...")
-
-	self:stopPolling()
-
-	self._reconciler:destruct()
-	self._reconciler = Reconciler.new()
-
-	self._api = nil
-	self._polling = false
-	self._syncInProgress = false
-end
-
-function Plugin:api()
-	if not self._api then
-		self._api = Api.connect(self._http)
-			:catch(function(err)
-				self._api = nil
-				return Promise.reject(err)
-			end)
-	end
-
-	return self._api
-end
-
-function Plugin:connect()
-	print("Rojo: Testing connection...")
-
-	return self:api()
-		:andThen(function(api)
-			local ok, info = api:getInfo():await()
-
-			if not ok then
-				return Promise.reject(info)
-			end
-
-			print("Rojo: Server found!")
-			print("Rojo: Protocol version:", info.protocolVersion)
-			print("Rojo: Server version:", info.serverVersion)
-		end)
-		:catch(function(err)
-			if err == Api.Error.ServerIdMismatch then
-				self:restart()
-				return self:connect()
-			else
-				return Promise.reject(err)
-			end
-		end)
-end
-
-function Plugin:togglePolling()
-	if self._polling then
-		return self:stopPolling()
-	else
-		return self:startPolling()
-	end
-end
-
-function Plugin:stopPolling()
-	if not self._polling then
-		return Promise.resolve(false)
-	end
-
-	print("Rojo: Stopped polling server for changes.")
-
-	self._polling = false
-	self._label.Enabled = false
-
-	return Promise.resolve(true)
-end
-
-function Plugin:_pull(api, project, routes)
-	return api:read(routes)
-		:andThen(function(items)
-			for index = 1, #routes do
-				local itemRoute = routes[index]
-				local partitionName = itemRoute[1]
-				local partition = project.partitions[partitionName]
-				local item = items[index]
-
-				local partitionRoute = collectMatch(partition.target, "[^.]+")
-
-				-- If the item route's length was 1, we need to rename the instance to
-				-- line up with the partition's root object name.
-				--
-				-- This is a HACK!
-				if #itemRoute == 1 then
-					if item then
-						local objectName = partition.target:match("[^.]+$")
-						item.Name = objectName
-					end
-				end
-
-				local fullRoute = {}
-				for _, piece in ipairs(partitionRoute) do
-					table.insert(fullRoute, piece)
-				end
-
-				for i = 2, #itemRoute do
-					table.insert(fullRoute, itemRoute[i])
-				end
-
-				self._reconciler:reconcileRoute(fullRoute, item, itemRoute)
-			end
-		end)
-end
-
-function Plugin:startPolling()
-	if self._polling then
-		return
-	end
-
-	print("Rojo: Polling server for changes...")
-
-	self._polling = true
-	self._label.Enabled = true
-
-	return self:api()
-		:andThen(function(api)
-			local syncOk, result = self:syncIn():await()
-
-			if not syncOk then
-				return Promise.reject(result)
-			end
-
-			local infoOk, info = api:getInfo():await()
-
-			if not infoOk then
-				return Promise.reject(info)
-			end
-
-			while self._polling do
-				local changesOk, changes = api:getChanges():await()
-
-				if not changesOk then
-					return Promise.reject(changes)
-				end
-
-				if #changes > 0 then
-					local routes = {}
-
-					for _, change in ipairs(changes) do
-						table.insert(routes, change.route)
-					end
-
-					local pullOk, pullResult = self:_pull(api, info.project, routes):await()
-
-					if not pullOk then
-						return Promise.reject(pullResult)
-					end
-				end
-
-				wait(Config.pollingRate)
-			end
-		end)
-		:catch(function(err)
-			self:stopPolling()
-
-			if err == Api.Error.ServerIdMismatch then
-				self:restart()
-				return self:startPolling()
-			else
-				return Promise.reject(err)
-			end
-		end)
-end
-
-function Plugin:syncIn()
-	if self._syncInProgress then
-		warn("Rojo: Can't sync right now, because a sync is already in progress.")
-
-		return Promise.resolve()
-	end
-
-	self._syncInProgress = true
-	print("Rojo: Syncing from server...")
-
-	return self:api()
-		:andThen(function(api)
-			local ok, info = api:getInfo():await()
-
-			if not ok then
-				return Promise.reject(info)
-			end
-
-			local routes = {}
-
-			for name in pairs(info.project.partitions) do
-				table.insert(routes, {name})
-			end
-
-			self:_pull(api, info.project, routes)
-
-			self._syncInProgress = false
-			print("Rojo: Sync successful!")
-		end)
-		:catch(function(err)
-			self._syncInProgress = false
-
-			if err == Api.Error.ServerIdMismatch then
-				self:restart()
-				return self:syncIn()
-			else
-				return Promise.reject(err)
-			end
-		end)
-end
-
-return Plugin

plugin/src/Reconciler.lua

@@ -1,220 +1,401 @@
-local RouteMap = require(script.Parent.RouteMap)
+--[[
+	This module defines the meat of the Rojo plugin and how it manages tracking
+	and mutating the Roblox DOM.
+]]
 
-local function classEqual(a, b)
-	if a == "*" or b == "*" then
-		return true
-	end
+local RbxDom = require(script.Parent.Parent.RbxDom)
+local t = require(script.Parent.Parent.t)
+local Log = require(script.Parent.Parent.Log)
 
-	return a == b
-end
+local Types = require(script.Parent.Types)
+local invariant = require(script.Parent.invariant)
+local getCanonicalProperty = require(script.Parent.getCanonicalProperty)
+local setCanonicalProperty = require(script.Parent.setCanonicalProperty)
 
-local function applyProperties(target, properties)
-	for key, property in pairs(properties) do
-		-- TODO: Transform property value based on property.Type
-		-- Right now, we assume that 'value' is primitive!
-		target[key] = property.Value
-	end
+--[[
+	This interface represents either a patch created by the hydrate method, or a
+	patch returned from the API.
+
+	This type should be a subset of Types.ApiInstanceUpdate.
+]]
+local IPatch = t.interface({
+	removed = t.array(t.union(Types.RbxId, t.Instance)),
+	added = t.map(Types.RbxId, Types.ApiInstance),
+	updated = t.array(Types.ApiInstanceUpdate),
+})
+
+--[[
+	Attempt to safely set the parent of an instance.
+
+	This function will always succeed, even if the actual set failed. This is
+	important for some types like services that will throw even if their current
+	parent is already set to the requested parent.
+
+	TODO: See if we can eliminate this by being more nuanced with property
+	assignment?
+]]
+local function safeSetParent(instance, newParent)
+	pcall(function()
+		instance.Parent = newParent
+	end)
 end
 
 --[[
-	Attempt to parent `rbx` to `parent`, doing nothing if:
-	* parent is already `parent`
-	* Changing parent threw an error
+	Similar to setting Parent, some instances really don't like being renamed.
+
+	TODO: Should we be throwing away these results or can we be more careful?
 ]]
-local function reparent(rbx, parent)
-	if rbx then
-		if rbx.Parent == parent then
-			return
-		end
-
-		-- It's possible that 'rbx' is a service or some other object that we
-		-- can't change the parent of. That's the only reason why Parent would
-		-- fail except for rbx being previously destroyed!
-		pcall(function()
-			rbx.Parent = parent
-		end)
-	end
-end
-
---[[
-	Attempts to match up Roblox instances and object specifiers for
-	reconciliation.
-
-	An object is considered a match if they have the same Name and ClassName.
-
-	primaryChildren and secondaryChildren can each be either a list of Roblox
-	instances or object specifiers. Since they share a common shape, switching
-	the two around isn't problematic!
-
-	visited is expected to be an empty table initially. It will be filled with
-	the set of children that have been visited so far.
-]]
-local function findNextChildPair(primaryChildren, secondaryChildren, visited)
-	for _, primaryChild in ipairs(primaryChildren) do
-		if not visited[primaryChild] then
-			visited[primaryChild] = true
-
-			for _, secondaryChild in ipairs(secondaryChildren) do
-				if classEqual(primaryChild.ClassName, secondaryChild.ClassName) and primaryChild.Name == secondaryChild.Name then
-					visited[secondaryChild] = true
-
-					return primaryChild, secondaryChild
-				end
-			end
-
-			return primaryChild, nil
-		end
-	end
-
-	return nil, nil
+local function safeSetName(instance, name)
+	pcall(function()
+		instance.Name = name
+	end)
 end
 
 local Reconciler = {}
 Reconciler.__index = Reconciler
 
-function Reconciler.new()
-	local reconciler = {
-		_routeMap = RouteMap.new(),
+function Reconciler.new(instanceMap)
+	local self = {
+		-- Tracks all of the instances known by the reconciler by ID.
+		__instanceMap = instanceMap,
 	}
 
-	setmetatable(reconciler, Reconciler)
-
-	return reconciler
+	return setmetatable(self, Reconciler)
 end
 
 --[[
-	A semi-smart algorithm that attempts to apply the given item's children to
-	an existing Roblox object.
+	See Reconciler:__hydrateInternal().
 ]]
-function Reconciler:_reconcileChildren(rbx, item)
-	local visited = {}
-	local rbxChildren = rbx:GetChildren()
+function Reconciler:hydrate(apiInstances, id, instance)
+	local hydratePatch = {
+		removed = {},
+		added = {},
+		updated = {},
+	}
 
-	-- Reconcile any children that were added or updated
-	while true do
-		local itemChild, rbxChild = findNextChildPair(item.Children, rbxChildren, visited)
+	self:__hydrateInternal(apiInstances, id, instance, hydratePatch)
 
-		if not itemChild then
-			break
+	return hydratePatch
+end
+
+--[[
+	Applies a patch to the Roblox DOM using the reconciler's internal state.
+
+	TODO: This function might only apply some of the patch in the future and
+	require content negotiation with the Rojo server to handle types that aren't
+	editable by scripts.
+]]
+local applyPatchSchema = Types.ifEnabled(t.tuple(
+	IPatch
+))
+function Reconciler:applyPatch(patch)
+	assert(applyPatchSchema(patch))
+
+	for _, removedIdOrInstance in ipairs(patch.removed) do
+		local removedInstance
+
+		if Types.RbxId(removedIdOrInstance) then
+			-- If this value is an ID, it's assumed to be an instance that the
+			-- Rojo server knows about.
+			removedInstance = self.__instanceMap.fromIds[removedIdOrInstance]
+			self.__instanceMap:removeId(removedIdOrInstance)
 		end
 
-		reparent(self:reconcile(rbxChild, itemChild), rbx)
+		-- If this entry was an ID that we didn't know about, removedInstance
+		-- will be nil, which we guard against in case of minor tree desync.
+		if removedInstance ~= nil then
+			-- Ensure that if any descendants are tracked by Rojo, that we
+			-- properly un-track them.
+			for _, descendantInstance in ipairs(removedInstance:GetDescendants()) do
+				self.__instanceMap:removeInstance(descendantInstance)
+			end
+
+			removedInstance:Destroy()
+		end
 	end
 
-	-- Reconcile any children that were deleted
-	while true do
-		local rbxChild, itemChild = findNextChildPair(rbxChildren, item.Children, visited)
+	-- TODO: This loop assumes that apiInstance.ParentId is never nil. The Rojo
+	-- plugin can't create a new top-level DataModel anyways, so this should
+	-- only be violated in cases that are already erroneous.
+	for id, apiInstance in pairs(patch.added) do
+		if self.__instanceMap.fromIds[id] == nil then
+			-- Find the first ancestor of this instance that is marked for an
+			-- addition.
+			--
+			-- This helps us make sure we only reify each instance once, and we
+			-- start from the top.
+			while patch.added[apiInstance.Parent] ~= nil do
+				id = apiInstance.Parent
+				apiInstance = patch.added[id]
+			end
 
-		if not rbxChild then
-			break
+			local parentInstance = self.__instanceMap.fromIds[apiInstance.Parent]
+
+			if parentInstance == nil then
+				invariant(
+					"Cannot add an instance from a patch that has no parent.\nInstance {} with parent {}.\nState: {:#?}",
+					id,
+					apiInstance.Parent,
+					self.__instanceMap
+				)
+			end
+
+			self:__reifyInstance(patch.added, id, parentInstance)
+		end
+	end
+
+	for _, update in ipairs(patch.updated) do
+		local instance = self.__instanceMap.fromIds[update.id]
+
+		if instance == nil then
+			invariant(
+				"Cannot update an instance that does not exist in the reconciler's state.\nInstance {}\nState: {:#?}",
+				update.id,
+				self.__instanceMap
+			)
 		end
 
-		reparent(self:reconcile(rbxChild, itemChild), rbx)
+		if update.changedClassName ~= nil then
+			error("TODO: Support changing class name by destroying + recreating instance.")
+		end
+
+		if update.changedName ~= nil then
+			instance.Name = update.changedName
+		end
+
+		if update.changedMetadata ~= nil then
+			print("TODO: Support changing metadata, if necessary.")
+		end
+
+		if update.changedProperties ~= nil then
+			for propertyName, propertyValue in pairs(update.changedProperties) do
+				-- TODO: Gracefully handle this error instead?
+				assert(setCanonicalProperty(instance, propertyName, self:__decodeApiValue(propertyValue)))
+			end
+		end
 	end
 end
 
 --[[
-	Construct a new Roblox object from the given item.
+	Transforms a value into one that can be sent over the network back to the
+	Rojo server.
+
+	This operation can fail, and so it returns bool, value.
 ]]
-function Reconciler:_reify(item)
-	local className = item.ClassName
-
-	-- "*" represents a match of any class. It reifies as a folder!
-	if className == "*" then
-		className = "Folder"
+function Reconciler:encodeApiValue(value)
+	if typeof(value) == "string" then
+		return true, {
+			Type = "String",
+			Value = value,
+		}
 	end
 
-	local rbx = Instance.new(className)
-	rbx.Name = item.Name
-
-	applyProperties(rbx, item.Properties)
-
-	for _, child in ipairs(item.Children) do
-		reparent(self:_reify(child), rbx)
-	end
-
-	if item.Route then
-		self._routeMap:insert(item.Route, rbx)
-	end
-
-	return rbx
+	return false
 end
 
 --[[
-	Clears any state that the Reconciler has, stopping it completely.
+	Transforms a value encoded by rbx_dom_weak on the server side into a value
+	usable by Rojo's reconciler, potentially using RbxDom.
 ]]
-function Reconciler:destruct()
-	self._routeMap:destruct()
+function Reconciler:__decodeApiValue(apiValue)
+	assert(Types.ApiValue(apiValue))
+
+	-- Refs are represented as IDs in the same space that Rojo's protocol uses.
+	if apiValue.Type == "Ref" then
+		-- TODO: This ref could be pointing at an instance we haven't created
+		-- yet!
+
+		return self.__instanceMap.fromIds[apiValue.Value]
+	end
+
+	local success, decodedValue = RbxDom.EncodedValue.decode(apiValue)
+
+	if not success then
+		error(decodedValue, 2)
+	end
+
+	return decodedValue
 end
 
 --[[
-	Apply the changes represented by the given item to a Roblox object that's a
-	child of the given instance.
+	Constructs an instance from an ApiInstance without any of its children.
 ]]
-function Reconciler:reconcile(rbx, item)
-	-- Item was deleted
-	if not item then
-		if rbx then
-			self._routeMap:removeByRbx(rbx)
-			rbx:Destroy()
-		end
+local reifySingleInstanceSchema = Types.ifEnabled(t.tuple(
+	Types.ApiInstance
+))
+function Reconciler:__reifySingleInstance(apiInstance)
+	assert(reifySingleInstanceSchema(apiInstance))
 
-		return nil
+	-- Instance.new can fail if we're passing in something that can't be
+	-- created, like a service, something enabled with a feature flag, or
+	-- something that requires higher security than we have.
+	local ok, instance = pcall(Instance.new, apiInstance.ClassName)
+	if not ok then
+		return false, instance
 	end
 
-	-- Item was created!
-	if not rbx then
-		return self:_reify(item)
+	-- TODO: When can setting Name fail here?
+	safeSetName(instance, apiInstance.Name)
+
+	for key, value in pairs(apiInstance.Properties) do
+		setCanonicalProperty(instance, key, self:__decodeApiValue(value))
 	end
 
-	-- Item changed type!
-	if not classEqual(rbx.ClassName, item.ClassName) then
-		self._routeMap:removeByRbx(rbx)
-		rbx:Destroy()
-
-		return self:_reify(item)
-	end
-
-	applyProperties(rbx, item.Properties)
-	self:_reconcileChildren(rbx, item)
-
-	return rbx
+	return true, instance
 end
 
-function Reconciler:reconcileRoute(route, item, itemRoute)
-	local parent
-	local rbx = game
+--[[
+	Construct an instance and all of its descendants, parent it to the given
+	instance, and insert it into the reconciler's internal state.
+]]
+local reifyInstanceSchema = Types.ifEnabled(t.tuple(
+	t.map(Types.RbxId, Types.VirtualInstance),
+	Types.RbxId,
+	t.Instance
+))
+function Reconciler:__reifyInstance(apiInstances, id, parentInstance)
+	assert(reifyInstanceSchema(apiInstances, id, parentInstance))
 
-	for i = 1, #route do
-		local piece = route[i]
+	local apiInstance = apiInstances[id]
+	local ok, instance = self:__reifySingleInstance(apiInstance)
 
-		local child = rbx:FindFirstChild(piece)
-
-		-- We should get services instead of making folders here.
-		if rbx == game and not child then
-			local _
-			_, child = pcall(game.GetService, game, piece)
-		end
-
-		-- We don't want to create a folder if we're reaching our target item!
-		if not child and i ~= #route then
-			child = Instance.new("Folder")
-			child.Parent = rbx
-			child.Name = piece
-		end
-
-		parent = rbx
-		rbx = child
+	-- TODO: Propagate this error upward to handle it elsewhere?
+	if not ok then
+		error(("Couldn't create an instance of type %q, a child of %s"):format(
+			apiInstance.ClassName,
+			parentInstance:GetFullName()
+		))
 	end
 
-	-- Let's check the route map!
-	if not rbx then
-		rbx = self._routeMap:get(itemRoute)
+	self.__instanceMap:insert(id, instance)
+
+	for _, childId in ipairs(apiInstance.Children) do
+		self:__reifyInstance(apiInstances, childId, instance)
 	end
 
-	rbx = self:reconcile(rbx, item)
+	safeSetParent(instance, parentInstance)
 
-	reparent(rbx, parent)
+	return instance
 end
 
-return Reconciler
+--[[
+	Populates the reconciler's internal state, maps IDs to instances that the
+	Rojo plugin knows about, and generates a patch that would update the Roblox
+	tree to match Rojo's view of the tree.
+]]
+local hydrateSchema = Types.ifEnabled(t.tuple(
+	t.map(Types.RbxId, Types.VirtualInstance),
+	Types.RbxId,
+	t.Instance,
+	IPatch
+))
+function Reconciler:__hydrateInternal(apiInstances, id, instance, hydratePatch)
+	assert(hydrateSchema(apiInstances, id, instance, hydratePatch))
+
+	self.__instanceMap:insert(id, instance)
+
+	local apiInstance = apiInstances[id]
+
+	local function markIdAdded(id)
+		local apiInstance = apiInstances[id]
+		hydratePatch.added[id] = apiInstance
+
+		for _, childId in ipairs(apiInstance.Children) do
+			markIdAdded(childId)
+		end
+	end
+
+	local changedName = nil
+	local changedProperties = {}
+
+	if apiInstance.Name ~= instance.Name then
+		changedName = apiInstance.Name
+	end
+
+	for propertyName, virtualValue in pairs(apiInstance.Properties) do
+		local success, existingValue = getCanonicalProperty(instance, propertyName)
+
+		if success then
+			local decodedValue = self:__decodeApiValue(virtualValue)
+
+			if existingValue ~= decodedValue then
+				changedProperties[propertyName] = virtualValue
+			end
+		end
+	end
+
+	-- If any properties differed from the virtual instance we read, add it to
+	-- the hydrate patch so that we can catch up.
+	if changedName ~= nil or next(changedProperties) ~= nil then
+		table.insert(hydratePatch.updated, {
+			id = id,
+			changedName = changedName,
+			changedClassName = nil,
+			changedProperties = changedProperties,
+			changedMetadata = nil,
+		})
+	end
+
+	local existingChildren = instance:GetChildren()
+
+	-- For each existing child, we'll track whether it's been paired with an
+	-- instance that the Rojo server knows about.
+	local isExistingChildVisited = {}
+	for i = 1, #existingChildren do
+		isExistingChildVisited[i] = false
+	end
+
+	for _, childId in ipairs(apiInstance.Children) do
+		local apiChild = apiInstances[childId]
+
+		local childInstance
+
+		for childIndex, instance in ipairs(existingChildren) do
+			if not isExistingChildVisited[childIndex] then
+				-- We guard accessing Name and ClassName in order to avoid
+				-- tripping over children of DataModel that Rojo won't have
+				-- permissions to access at all.
+				local ok, name, className = pcall(function()
+					return instance.Name, instance.ClassName
+				end)
+
+				-- This rule is very conservative and could be loosened in the
+				-- future, or more heuristics could be introduced.
+				if ok and name == apiChild.Name and className == apiChild.ClassName then
+					childInstance = instance
+					isExistingChildVisited[childIndex] = true
+					break
+				end
+			end
+		end
+
+		if childInstance ~= nil then
+			-- We found an instance that matches the instance from the API, yay!
+			self:__hydrateInternal(apiInstances, childId, childInstance, hydratePatch)
+		else
+			markIdAdded(childId)
+		end
+	end
+
+	-- Any unvisited children at this point aren't known by Rojo and we can
+	-- destroy them unless the user has explicitly asked us to preserve children
+	-- of this instance.
+	local shouldClearUnknown = self:__shouldClearUnknownChildren(apiInstance)
+	if shouldClearUnknown then
+		for childIndex, visited in ipairs(isExistingChildVisited) do
+			if not visited then
+				table.insert(hydratePatch.removed, existingChildren[childIndex])
+			end
+		end
+	end
+end
+
+function Reconciler:__shouldClearUnknownChildren(apiInstance)
+	if apiInstance.Metadata ~= nil then
+		return not apiInstance.Metadata.ignoreUnknownInstances
+	else
+		return true
+	end
+end
+
+return Reconciler

plugin/src/RouteMap.lua

@@ -1,123 +0,0 @@
---[[
-	A map from Route objects (given by the server) to Roblox instances (created
-	by the plugin).
-]]
-
-local function hashRoute(route)
-	return table.concat(route, "/")
-end
-
-local RouteMap = {}
-RouteMap.__index = RouteMap
-
-function RouteMap.new()
-	local self = {
-		_map = {},
-		_reverseMap = {},
-		_connectionsByRbx = {},
-	}
-
-	setmetatable(self, RouteMap)
-
-	return self
-end
-
-function RouteMap:insert(route, rbx)
-	local hashed = hashRoute(route)
-
-	-- Make sure that each route and instance are only present in RouteMap once.
-	self:removeByRoute(route)
-	self:removeByRbx(rbx)
-
-	self._map[hashed] = rbx
-	self._reverseMap[rbx] = hashed
-	self._connectionsByRbx[rbx] = rbx.AncestryChanged:Connect(function(_, parent)
-		if parent == nil then
-			self:removeByRbx(rbx)
-		end
-	end)
-end
-
-function RouteMap:get(route)
-	return self._map[hashRoute(route)]
-end
-
-function RouteMap:removeByRoute(route)
-	local hashedRoute = hashRoute(route)
-	local rbx = self._map[hashedRoute]
-
-	if rbx ~= nil then
-		self:_removeInternal(rbx, hashedRoute)
-	end
-end
-
-function RouteMap:removeByRbx(rbx)
-	local hashedRoute = self._reverseMap[rbx]
-
-	if hashedRoute ~= nil then
-		self:_removeInternal(rbx, hashedRoute)
-	end
-end
-
---[[
-	Correcly removes the given Roblox Instance/Route pair from the RouteMap.
-]]
-function RouteMap:_removeInternal(rbx, hashedRoute)
-	self._map[hashedRoute] = nil
-	self._reverseMap[rbx] = nil
-	self._connectionsByRbx[rbx]:Disconnect()
-	self._connectionsByRbx[rbx] = nil
-
-	self:removeRbxDescendants(rbx)
-end
-
---[[
-	Ensure that there are no descendants of the given Roblox Instance still
-	present in the map, guaranteeing that it has been cleaned out.
-]]
-function RouteMap:_removeRbxDescendants(parentRbx)
-	for rbx in pairs(self._reverseMap) do
-		if rbx:IsDescendantOf(parentRbx) then
-			self:removeByRbx(rbx)
-		end
-	end
-end
-
---[[
-	Remove all items from the map and disconnect all connections, cleaning up
-	the RouteMap.
-]]
-function RouteMap:destruct()
-	self._map = {}
-	self._reverseMap = {}
-
-	for _, connection in pairs(self._connectionsByRbx) do
-		connection:Disconnect()
-	end
-
-	self._connectionsByRbx = {}
-end
-
-function RouteMap:visualize()
-	-- Log all of our keys so that the visualization has a stable order.
-	local keys = {}
-
-	for key in pairs(self._map) do
-		table.insert(keys, key)
-	end
-
-	table.sort(keys)
-
-	local buffer = {}
-	for _, key in ipairs(keys) do
-		local visualized = ("- %s: %s"):format(
-			key,
-			self._map[key]:GetFullName()
-		)
-		table.insert(buffer, visualized)
-	end
-
-	return table.concat(buffer, "\n")
-end
-
-return RouteMap

plugin/src/ServeSession.lua

@@ -0,0 +1,213 @@
+local Log = require(script.Parent.Parent.Log)
+local Fmt = require(script.Parent.Parent.Fmt)
+local t = require(script.Parent.Parent.t)
+
+local DevSettings = require(script.Parent.DevSettings)
+local InstanceMap = require(script.Parent.InstanceMap)
+local Reconciler = require(script.Parent.Reconciler)
+local strict = require(script.Parent.strict)
+
+local Status = strict("Session.Status", {
+	NotStarted = "NotStarted",
+	Connecting = "Connecting",
+	Connected = "Connected",
+	Disconnected = "Disconnected",
+})
+
+local function debugPatch(patch)
+	return Fmt.debugify(patch, function(patch, output)
+		output:writeLine("Patch {{")
+		output:indent()
+
+		for removed in ipairs(patch.removed) do
+			output:writeLine("Remove ID {}", removed)
+		end
+
+		for id, added in pairs(patch.added) do
+			output:writeLine("Add ID {} {:#?}", id, added)
+		end
+
+		for _, updated in ipairs(patch.updated) do
+			output:writeLine("Update ID {} {:#?}", updated.id, updated)
+		end
+
+		output:unindent()
+		output:write("}")
+	end)
+end
+
+local ServeSession = {}
+ServeSession.__index = ServeSession
+
+ServeSession.Status = Status
+
+local validateServeOptions = t.strictInterface({
+	apiContext = t.table,
+})
+
+function ServeSession.new(options)
+	assert(validateServeOptions(options))
+
+	-- Declare self ahead of time to capture it in a closure
+	local self
+	local function onInstanceChanged(instance, propertyName)
+		self:__onInstanceChanged(instance, propertyName)
+	end
+
+	local instanceMap = InstanceMap.new(onInstanceChanged)
+	local reconciler = Reconciler.new(instanceMap)
+
+	self = {
+		__status = Status.NotStarted,
+		__apiContext = options.apiContext,
+		__reconciler = reconciler,
+		__instanceMap = instanceMap,
+		__statusChangedCallback = nil,
+	}
+
+	setmetatable(self, ServeSession)
+
+	return self
+end
+
+function ServeSession:__fmtDebug(output)
+	output:writeLine("ServeSession {{")
+	output:indent()
+
+	output:writeLine("API Context: {:#?}", self.__apiContext)
+	output:writeLine("Instances: {:#?}", self.__instanceMap)
+
+	output:unindent()
+	output:write("}")
+end
+
+function ServeSession:onStatusChanged(callback)
+	self.__statusChangedCallback = callback
+end
+
+function ServeSession:start()
+	self:__setStatus(Status.Connecting)
+
+	self.__apiContext:connect()
+		:andThen(function(serverInfo)
+			self:__setStatus(Status.Connected)
+
+			local rootInstanceId = serverInfo.rootInstanceId
+
+			return self:__initialSync(rootInstanceId)
+				:andThen(function()
+					return self:__mainSyncLoop()
+				end)
+		end)
+		:catch(function(err)
+			self:__stopInternal(err)
+		end)
+end
+
+function ServeSession:stop()
+	self:__stopInternal()
+end
+
+function ServeSession:__onInstanceChanged(instance, propertyName)
+	if not DevSettings:twoWaySyncEnabled() then
+		return
+	end
+
+	local instanceId = self.__instanceMap.fromInstances[instance]
+
+	if instanceId == nil then
+		Log.warn("Ignoring change for instance {:?} as it is unknown to Rojo", instance)
+		return
+	end
+
+	local remove = nil
+
+	local update = {
+		id = instanceId,
+		changedProperties = {},
+	}
+
+	if propertyName == "Name" then
+		update.changedName = instance.Name
+	elseif propertyName == "Parent" then
+		if instance.Parent == nil then
+			update = nil
+			remove = instanceId
+		else
+			Log.warn("Cannot sync non-nil Parent property changes yet")
+			return
+		end
+	else
+		local success, encoded = self.__reconciler:encodeApiValue(instance[propertyName])
+
+		if not success then
+			Log.warn("Could not sync back property {:?}.{}", instance, propertyName)
+			return
+		end
+
+		update.changedProperties[propertyName] = encoded
+	end
+
+	local patch = {
+		removed = {remove},
+		added = {},
+		updated = {update},
+	}
+
+	self.__apiContext:write(patch)
+end
+
+function ServeSession:__initialSync(rootInstanceId)
+	return self.__apiContext:read({ rootInstanceId })
+		:andThen(function(readResponseBody)
+			-- Tell the API Context that we're up-to-date with the version of
+			-- the tree defined in this response.
+			self.__apiContext:setMessageCursor(readResponseBody.messageCursor)
+
+			Log.trace("Computing changes that plugin needs to make to catch up to server...")
+
+			-- Calculate the initial patch to apply to the DataModel to catch us
+			-- up to what Rojo thinks the place should look like.
+			local hydratePatch = self.__reconciler:hydrate(
+				readResponseBody.instances,
+				rootInstanceId,
+				game
+			)
+
+			Log.trace("Computed hydration patch: {:#?}", debugPatch(hydratePatch))
+
+			-- TODO: Prompt user to notify them of this patch, since it's
+			-- effectively a conflict between the Rojo server and the client.
+
+			self.__reconciler:applyPatch(hydratePatch)
+		end)
+end
+
+function ServeSession:__mainSyncLoop()
+	return self.__apiContext:retrieveMessages()
+		:andThen(function(messages)
+			for _, message in ipairs(messages) do
+				self.__reconciler:applyPatch(message)
+			end
+
+			if self.__status ~= Status.Disconnected then
+				return self:__mainSyncLoop()
+			end
+		end)
+end
+
+function ServeSession:__stopInternal(err)
+	self:__setStatus(Status.Disconnected, err)
+	self.__apiContext:disconnect()
+	self.__instanceMap:stop()
+end
+
+function ServeSession:__setStatus(status, detail)
+	self.__status = status
+
+	if self.__statusChangedCallback ~= nil then
+		self.__statusChangedCallback(status, detail)
+	end
+end
+
+return ServeSession

plugin/src/Theme.lua

@@ -0,0 +1,14 @@
+local strict = require(script.Parent.strict)
+
+return strict("Theme", {
+	ButtonFont = Enum.Font.GothamSemibold,
+	InputFont = Enum.Font.Code,
+	TitleFont = Enum.Font.GothamBold,
+	MainFont = Enum.Font.Gotham,
+
+	AccentColor = Color3.fromRGB(225, 56, 53),
+	AccentLightColor = Color3.fromRGB(255, 146, 145),
+	PrimaryColor = Color3.fromRGB(64, 64, 64),
+	SecondaryColor = Color3.fromRGB(235, 235, 235),
+	LightTextColor = Color3.fromRGB(160, 160, 160),
+})

plugin/src/Types.lua

@@ -0,0 +1,99 @@
+local t = require(script.Parent.Parent.t)
+
+local DevSettings = require(script.Parent.DevSettings)
+local strict = require(script.Parent.strict)
+
+local RbxId = t.string
+
+local ApiValue = t.interface({
+	Type = t.string,
+	Value = t.optional(t.any),
+})
+
+local ApiInstanceMetadata = t.interface({
+	ignoreUnknownInstances = t.optional(t.boolean),
+})
+
+local ApiInstance = t.interface({
+	Id = RbxId,
+	Parent = t.optional(RbxId),
+	Name = t.string,
+	ClassName = t.string,
+	Properties = t.map(t.string, ApiValue),
+	Metadata = t.optional(ApiInstanceMetadata),
+	Children = t.array(RbxId),
+})
+
+local ApiInstanceUpdate = t.interface({
+	id = RbxId,
+	changedName = t.optional(t.string),
+	changedClassName = t.optional(t.string),
+	changedProperties = t.map(t.string, ApiValue),
+	changedMetadata = t.optional(ApiInstanceMetadata),
+})
+
+local ApiSubscribeMessage = t.interface({
+	removed = t.array(RbxId),
+	added = t.map(RbxId, ApiInstance),
+	updated = t.array(ApiInstanceUpdate),
+})
+
+local ApiInfoResponse = t.interface({
+	sessionId = t.string,
+	serverVersion = t.string,
+	protocolVersion = t.number,
+	expectedPlaceIds = t.optional(t.array(t.number)),
+	rootInstanceId = RbxId,
+})
+
+local ApiReadResponse = t.interface({
+	sessionId = t.string,
+	messageCursor = t.number,
+	instances = t.map(RbxId, ApiInstance),
+})
+
+local ApiSubscribeResponse = t.interface({
+	sessionId = t.string,
+	messageCursor = t.number,
+	messages = t.array(ApiSubscribeMessage),
+})
+
+local ApiError = t.interface({
+	kind = t.union(
+		t.literal("NotFound"),
+		t.literal("BadRequest"),
+		t.literal("InternalError")
+	),
+	details = t.string,
+})
+
+local function ifEnabled(innerCheck)
+	return function(...)
+		if DevSettings:shouldTypecheck() then
+			return innerCheck(...)
+		else
+			return true
+		end
+	end
+end
+
+return strict("Types", {
+	ifEnabled = ifEnabled,
+
+	ApiInfoResponse = ApiInfoResponse,
+	ApiReadResponse = ApiReadResponse,
+	ApiSubscribeResponse = ApiSubscribeResponse,
+	ApiError = ApiError,
+
+	ApiInstance = ApiInstance,
+	ApiInstanceUpdate = ApiInstanceUpdate,
+	ApiInstanceMetadata = ApiInstanceMetadata,
+	ApiSubscribeMessage = ApiSubscribeMessage,
+	ApiValue = ApiValue,
+	RbxId = RbxId,
+
+	-- Deprecated aliases during transition
+	VirtualInstance = ApiInstance,
+	VirtualMetadata = ApiInstanceMetadata,
+	VirtualValue = ApiValue,
+})