using the new fs.writeFile API instead of fs.open -- much, much nicer

src/command_line.coffee

@@ -99,14 +99,12 @@ watch_scripts: ->
       return if curr.mtime.getTime() is prev.mtime.getTime()
       fs.readFile(source).addCallback (code) -> compile_script(source, code)
 
-
 # Write out a JavaScript source file with the compiled code.
 write_js: (source, js) ->
   filename: path.basename(source, path.extname(source)) + '.js'
   dir:      options.output or path.dirname(source)
   js_path:  path.join dir, filename
-  fs.open(js_path, 'w+', 0755).addCallback (fd) ->
-    fs.write(fd, js)
+  fs.writeFile js_path, js
 
 # Pipe compiled JS through JSLint (requires a working 'jsl' command).
 lint: (js) ->