plugin.coffee

browserify = require 'browserify'

module.exports = (env, callback) ->
  options = env.config.browserify or {}
  options.transforms ?= ['caching-coffeeify']
  options.debug ?= (env.mode is 'preview')
  options.externals ?= {}
  options.ignore ?= []
  options.extensions ?= ['.coffee']

  for transform, i in options.transforms
    options.transforms[i] = require transform

  class BrowserifyPlugin extends env.ContentPlugin

    constructor: (@filepath) ->
      @bundler = browserify options
      @bundler.add @filepath.full
      externals = options.externals[@filepath.relative] or []
      @bundler.external file for file in externals
      @bundler.ignore file for file in options.ignore
      @bundler.transform transform for transform in options.transforms

    @property 'source', ->
      require('fs').readFileSync(@filepath.full).toString()

    getFilename: ->
      env.utils.stripExtension(@filepath.relative) + '.js'

    getView: -> (env, locals, contents, templates, callback) ->
      stream = @bundler.bundle()
      stream.on 'error', (error) =>
        # add better debuginfo to parse errors
        msg = ''
        if error.file?
          msg += env.relativeContentsPath error.file
        else
          msg += @filepath.relative
        msg += ':'
        if error.location?.first_line?
          msg += "#{ error.location.first_line }"
        msg += " #{ error.message }"
        if error.body? and error.location?.first_line? and error.location?.first_column?
          line = error.body.split('\n')[error.location.first_line]
          pad = (' ' for i in [0...error.location.first_column]).join('')
          msg += "\n\n  #{ line }\n  #{ pad }^\n"
        error.message = msg
      callback null, stream

  BrowserifyPlugin.fromFile = (filepath, callback) ->
    callback null, new BrowserifyPlugin filepath

  env.registerContentPlugin 'scripts', '**/*.*(js|coffee)', BrowserifyPlugin
  callback()