From f444fb9e383ae7327d0a04e28f133335a82daf02 Mon Sep 17 00:00:00 2001
From: Matthew Beale <matt.beale@madhatted.com>
Date: Fri, 29 Jul 2011 09:36:22 +0200
Subject: [PATCH] Add a `cake watch` task

---
 Cakefile | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/Cakefile b/Cakefile
index 345876e..355ade6 100644
--- a/Cakefile
+++ b/Cakefile
@@ -15,15 +15,24 @@ run = (cmd, args, cb) ->
     process.exit(1) if status != 0
     cb() if typeof cb is 'function'
 
+coffescript_files = ->
+  'coffee/' + file for file in (fs.readdirSync 'coffee') when file.match(/\.coffee$/)
+
 # Build Chosen. Requires `coffee` and `uglifyjs`.
 #
 task 'build', 'build Chosen from source', build = (cb) ->
-  files = fs.readdirSync 'coffee'
-  files = ('coffee/' + file for file in files when file.match(/\.coffee$/))
-  run 'coffee', ['-c', '-o', 'chosen'].concat(files), ->
+  run 'coffee', ['-c', '-o', 'chosen'].concat(coffescript_files()), ->
     cb() if typeof cb is 'function'
     unless process.env.MINIFY is 'false'
       for javascript in javascripts
         uglified = javascript.replace /\.js$/, '.min.js'
         run 'uglifyjs', ['-o', uglified, javascript], cb
  
+task 'watch', 'watch coffee/ for changes and build Chosen', ->
+  console.log "Watching for changes in coffee/"
+  for file in coffescript_files()
+    fs.watchFile file, (curr, prev) ->
+      if +curr.mtime isnt +prev.mtime
+        console.log "Saw change in #{file}"
+        invoke 'build'
+