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CakefileでCoffeScriptをwatch

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CakefileでCoffeeScriptをwatchするタスク。
色々なところから拝借したものだけど。
さくっと作ってプロジェクトで環境を共有したいときに。
(なんかそういう用のいいライブラリとかありそうだけど)

{spawn, exec} = require 'child_process'
 
option '-o', '--output [DIR]', 'Output directory.'
option '-t', '--target [DIR]', 'Watch target directory.'
 
stdout_handler = (data) ->
    console.log data.toString().trim()
 
build = (watch, output, target) ->
    console.log 'Watching coffee scripts'
 
    options = ['-c', '-o', (output || 'js'), (target || '_src/coffee')]
 
    if watch is true
        options[0] = '-cw'
 
    coffee = spawn 'coffee', options
 
    coffee.stdout.on 'data', stdout_handler
 
 
task 'build', 'build the project', (watch) ->
    build watch
 
task 'watch', 'watch for changes and rebuild', (options) ->
    build true, options.output, options.target
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