command.coffee

fs             = require 'fs'
path           = require 'path'
helpers        = require './helpers'
optparse       = require './optparse'
CoffeeScript   = require './coffee-script'
{spawn, exec}  = require 'child_process'
{EventEmitter} = require 'events'

helpers.extend CoffeeScript, new EventEmitter

printLine = (line) -> process.stdout.write line + '\n'
printWarn = (line) -> process.binding('stdio').writeError line + '\n'

BANNER = '''
  Usage: coffee [options] path/to/script.coffee
         '''

SWITCHES = [
  ['-c', '--compile',         'compile to JavaScript and save as .js files']
  ['-i', '--interactive',     'run an interactive CoffeeScript REPL']
  ['-o', '--output [DIR]',    'set the directory for compiled JavaScript']
  ['-j', '--join [FILE]',     'concatenate the scripts before compiling']
  ['-w', '--watch',           'watch scripts for changes, and recompile']
  ['-p', '--print',           'print the compiled JavaScript to stdout']
  ['-l', '--lint',            'pipe the compiled JavaScript through JavaScript Lint']
  ['-s', '--stdio',           'listen for and compile scripts over stdio']
  ['-e', '--eval',            'compile a string from the command line']
  ['-r', '--require [FILE*]', 'require a library before executing your script']
  ['-b', '--bare',            'compile without the top-level function wrapper']
  ['-t', '--tokens',          'print the tokens that the lexer produces']
  ['-n', '--nodes',           'print the parse tree that Jison produces']
  [      '--nodejs [ARGS]',   'pass options through to the "node" binary']
  ['-v', '--version',         'display CoffeeScript version']
  ['-h', '--help',            'display this help message']
]

opts         = {}
sources      = []
contents     = []
optionParser = null

exports.run = ->
  parseOptions()
  return forkNode()                      if opts.nodejs
  return usage()                         if opts.help
  return version()                       if opts.version
  loadRequires()                         if opts.require
  return require './repl'                if opts.interactive
  return compileStdio()                  if opts.stdio
  return compileScript null, sources[0]  if opts.eval
  return require './repl'                unless sources.length
  if opts.run
    opts.literals = sources.splice(1).concat opts.literals
  process.ARGV = process.argv = process.argv.slice(0, 2).concat opts.literals
  process.argv[0] = 'coffee'
  process.execPath = require.main.filename
  compileScripts()

compileScripts = ->
  for source in sources
    base = path.join(source)
    compile = (source, topLevel) ->
      path.exists source, (exists) ->
        throw new Error "File not found: #{source}" if topLevel and not exists
        fs.stat source, (err, stats) ->
          throw err if err
          if stats.isDirectory()
            fs.readdir source, (err, files) ->
              for file in files
                compile path.join(source, file)
          else if topLevel or path.extname(source) is '.coffee'
            fs.readFile source, (err, code) ->
              if opts.join
                contents[sources.indexOf source] = code.toString()
                compileJoin() if helpers.compact(contents).length > 0
              else
                compileScript(source, code.toString(), base)
            watch source, base if opts.watch and not opts.join
    compile source, true

compileScript = (file, input, base) ->
  o = opts
  options = compileOptions file
  try
    t = task = {file, input, options}
    CoffeeScript.emit 'compile', task
    if      o.tokens      then printTokens CoffeeScript.tokens t.input
    else if o.nodes       then printLine CoffeeScript.nodes(t.input).toString().trim()
    else if o.run         then CoffeeScript.run t.input, t.options
    else
      t.output = CoffeeScript.compile t.input, t.options
      CoffeeScript.emit 'success', task
      if o.print          then printLine t.output.trim()
      else if o.compile   then writeJs t.file, t.output, base
      else if o.lint      then lint t.file, t.output
  catch err
    CoffeeScript.emit 'failure', err, task
    return if CoffeeScript.listeners('failure').length
    return printLine err.message if o.watch
    printWarn err.stack
    process.exit 1

compileStdio = ->
  code = ''
  stdin = process.openStdin()
  stdin.on 'data', (buffer) ->
    code += buffer.toString() if buffer
  stdin.on 'end', ->
    compileScript null, code

compileJoin = ->
  code = contents.join '\n'
  compileScript opts.join, code, opts.join

loadRequires = ->
  realFilename = module.filename
  module.filename = '.'
  require req for req in opts.require
  module.filename = realFilename

watch = (source, base) ->
  fs.watchFile source, {persistent: true, interval: 500}, (curr, prev) ->
    return if curr.size is prev.size and curr.mtime.getTime() is prev.mtime.getTime()
    fs.readFile source, (err, code) ->
      throw err if err
      compileScript(source, code.toString(), base)

writeJs = (source, js, base) ->
  filename  = path.basename(source, path.extname(source)) + '.js'
  srcDir    = path.dirname source
  baseDir   = if base is '.' then srcDir else srcDir.substring base.length
  dir       = if opts.output then path.join opts.output, baseDir else srcDir
  jsPath    = path.join dir, filename
  compile   = ->
    js = ' ' if js.length <= 0
    fs.writeFile jsPath, js, (err) ->
      if err
        printLine err.message
      else if opts.compile and opts.watch
        console.log "#{(new Date).toLocaleTimeString()} - compiled #{source}"
  path.exists dir, (exists) ->
    if exists then compile() else exec "mkdir -p #{dir}", compile

lint = (file, js) ->
  printIt = (buffer) -> printLine file + ':\t' + buffer.toString().trim()
  conf = __dirname + '/../extras/jsl.conf'
  jsl = spawn 'jsl', ['-nologo', '-stdin', '-conf', conf]
  jsl.stdout.on 'data', printIt
  jsl.stderr.on 'data', printIt
  jsl.stdin.write js
  jsl.stdin.end()

printTokens = (tokens) ->
  strings = for token in tokens
    [tag, value] = [token[0], token[1].toString().replace(/\n/, '\\n')]
    "[#{tag} #{value}]"
  printLine strings.join(' ')

parseOptions = ->
  optionParser  = new optparse.OptionParser SWITCHES, BANNER
  o = opts      = optionParser.parse process.argv.slice 2
  o.compile     or=  !!o.output
  o.run         = not (o.compile or o.print or o.lint)
  o.print       = !!  (o.print or (o.eval or o.stdio and o.compile))
  sources       = o.arguments

compileOptions = (filename) -> {filename, bare: opts.bare}

forkNode = ->
  nodeArgs = opts.nodejs.split /\s+/
  args     = process.argv[1..]
  args.splice args.indexOf('--nodejs'), 2
  spawn process.execPath, nodeArgs.concat(args),
    cwd:        process.cwd()
    env:        process.env
    customFds:  [0, 1, 2]

usage = ->
  printLine (new optparse.OptionParser SWITCHES, BANNER).help()

version = ->
  printLine "CoffeeScript version #{CoffeeScript.VERSION}"