Add test model, shore up 'build' command more

server/src/commands/build.rs

@@ -1,6 +1,7 @@
 use std::{
     path::PathBuf,
     fs::File,
+    io,
     fmt,
 };
 
@@ -19,17 +20,12 @@ pub enum OutputKind {
 }
 
 fn detect_output_kind(options: &BuildOptions) -> Option<OutputKind> {
-    match options.output_kind {
-        Some(output_kind) => Some(output_kind),
-        None => {
-            let extension = options.output_file.extension()?.to_str()?;
+    let extension = options.output_file.extension()?.to_str()?;
 
-            match extension {
-                "rbxlx" => Some(OutputKind::Rbxlx),
-                "rbxmx" => Some(OutputKind::Rbxmx),
-                _ => None,
-            }
-        },
+    match extension {
+        "rbxlx" => Some(OutputKind::Rbxlx),
+        "rbxmx" => Some(OutputKind::Rbxmx),
+        _ => None,
     }
 }
 
@@ -43,6 +39,7 @@ pub struct BuildOptions {
 pub enum BuildError {
     UnknownOutputKind,
     ProjectLoadError(ProjectLoadFuzzyError),
+    IoError(io::Error),
 }
 
 impl fmt::Display for BuildError {
@@ -52,6 +49,7 @@ impl fmt::Display for BuildError {
                 write!(output, "Could not detect what kind of output file to create")
             },
             BuildError::ProjectLoadError(inner) => write!(output, "{}", inner),
+            BuildError::IoError(inner) => write!(output, "{}", inner),
         }
     }
 }
@@ -62,8 +60,15 @@ impl From<ProjectLoadFuzzyError> for BuildError {
     }
 }
 
+impl From<io::Error> for BuildError {
+    fn from(error: io::Error) -> BuildError {
+        BuildError::IoError(error)
+    }
+}
+
 pub fn build(options: &BuildOptions) -> Result<(), BuildError> {
-    let output_kind = detect_output_kind(options)
+    let output_kind = options.output_kind
+        .or_else(|| detect_output_kind(options))
         .ok_or(BuildError::UnknownOutputKind)?;
 
     info!("Hoping to generate file of type {:?}", output_kind);
@@ -75,20 +80,22 @@ pub fn build(options: &BuildOptions) -> Result<(), BuildError> {
     info!("Found project at {}", project.file_location.display());
     info!("Using project {:#?}", project);
 
-    let imfs = Imfs::new(&project)
-        .expect("Could not create in-memory filesystem");
-
+    let imfs = Imfs::new(&project)?;
     let tree = construct_oneoff_tree(&project, &imfs);
-
-    let mut file = File::create(&options.output_file)
-        .expect("Could not open output file for write");
+    let mut file = File::create(&options.output_file)?;
 
     match output_kind {
         OutputKind::Rbxmx => {
+            // Model files include the root instance of the tree and all its
+            // descendants.
+
             let root_id = tree.get_root_id();
             rbxmx::encode(&tree, &[root_id], &mut file);
         },
         OutputKind::Rbxlx => {
+            // Place files don't contain an entry for the DataModel, but our
+            // RbxTree representation does.
+
             let root_id = tree.get_root_id();
             let top_level_ids = tree.get_instance(root_id).unwrap().get_children_ids();
             rbxmx::encode(&tree, top_level_ids, &mut file);

test-projects/single-sync-point/roblox-project.json

@@ -1,5 +1,5 @@
 {
-  "name": "empty",
+  "name": "single-sync-point",
   "tree": {
     "$className": "DataModel",
     "ReplicatedStorage": {

test-projects/test-model/roblox-project.json

@@ -0,0 +1,9 @@
+{
+  "name": "empty",
+  "tree": {
+    "$className": "Folder",
+    "Library": {
+      "$path": "src"
+    }
+  }
+}

test-projects/test-model/src/main.lua

@@ -0,0 +1,3 @@
+local other = require(script.Parent.other)
+
+print(other)

test-projects/test-model/src/other.lua

@@ -0,0 +1 @@
+return "Hello, world!"