hook.io-gzbz2/src/index.coffee

A hook to compress and uncompress. Operates synchronously for now.

Hook = require('hook.io').Hook
util = require 'util'
colors = require 'colors'
path = require 'path'
fs = require "fs"
spawn = require("child_process").spawn

require('pkginfo')(module,'version','hook')
  
class exports.Gzbz2 extends Hook
  constructor: (options) ->
    self = @
    Hook.call self, options
  
    self.on "hook::ready", ->  
  
      self.on "gzbz2::compress", (data)->
        self._compress(data)

      self.on "gzbz2::uncompress", (data)->
        self._uncompress(data)
      
      for compress in (self.compresss || [])
        self.emit "gzbz2::compress",
          source : compress.source
          target : compress.target
          mode : compress.mode

      for uncompress in (self.uncompresss || [])
        self.emit "gzbz2::uncompress",
          source : uncompress.source
          target : uncompress.target
    
  _runCommand : (cmd,args,eventName,data) =>
    fd = fs.openSync data.target, "w", 0644

    zip = spawn(cmd,args)

    zip.stdout.on "data", (data) =>
      fs.writeSync fd, data, 0, data.length, null

    zip.stderr.on "data", (data) =>
      console.log "ERROR: #{data}"
  
    zip.on "exit", (code) =>
      fs.closeSync fd

      #console.log "EXIT #{code}"
      if code != 0  
        try
          fs.unlinkSync data.target  # cleanup
        catch ignore
      
        @emit "gzbz2::error", 
          source: data.source
          target: data.target
          mode: data.mode
          code: code
      else    
        @emit eventName, 
          source: data.source
          target: data.target
          mode: data.mode

  _compress : (data) =>
    console.log "Compressing #{data.source} to #{data.target}".cyan

    data.mode = 'gzip' unless data.mode == 'bzip2'
  
    data.target = path.normalize data.target
    if data.mode == 'gzip'
      @_runCommand "gzip",[ "-c", data.source ],"gzbz2::compress-complete",data
    else
      @_runCommand "bzip2",[ "-c", data.source ],"gzbz2::compress-complete",data    

      
  _uncompress : (data) =>
    console.log "Uncompress for #{data.source}".cyan
  
    data.mode = 'gzip' unless data.mode == 'bzip2'
  
    data.target = path.normalize data.target
  
    if data.mode == 'gzip'
      @_runCommand "gunzip",[ "-c", data.source ],"gzbz2::uncompress-complete",data
    else
      @_runCommand "bzip2",[ "-dc", data.source ],"gzbz2::uncompress-complete",data