From 54b82760cdd7e39608f2da69d350bb9e37e1b5d7 Mon Sep 17 00:00:00 2001
From: Lucien Greathouse <me@lpghatguy.com>
Date: Mon, 1 Apr 2019 18:02:46 -0700
Subject: [PATCH] Switch 'rojo build' to use BufWriter, magic performance
 increase

---
 CHANGELOG.md                 | 2 ++
 server/src/commands/build.rs | 6 ++++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2dc4fe4c..234a8cbd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
 # Rojo Changelog
 
 ## [Unreleased]
+* 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/LPGhatguy/roads) to an `rbxlx` file dropped from 150ms to 70ms on my machine
 
 ## [0.5.0 Alpha 8](https://github.com/LPGhatguy/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:
diff --git a/server/src/commands/build.rs b/server/src/commands/build.rs
index 16301ed3..8a65387f 100644
--- a/server/src/commands/build.rs
+++ b/server/src/commands/build.rs
@@ -1,7 +1,7 @@
 use std::{
     path::PathBuf,
     fs::File,
-    io,
+    io::{self, Write, BufWriter},
 };
 
 use log::info;
@@ -92,7 +92,7 @@ pub fn build(options: &BuildOptions) -> Result<(), BuildError> {
     let mut imfs = Imfs::new();
     imfs.add_roots_from_project(&project)?;
     let tree = construct_oneoff_tree(&project, &imfs)?;
-    let mut file = File::create(&options.output_file)?;
+    let mut file = BufWriter::new(File::create(&options.output_file)?);
 
     match output_kind {
         OutputKind::Rbxmx => {
@@ -121,5 +121,7 @@ pub fn build(options: &BuildOptions) -> Result<(), BuildError> {
         },
     }
 
+    file.flush()?;
+
     Ok(())
 }
\ No newline at end of file