#!/usr/bin/env ruby

require 'rubygems'
require 'oyster'
require File.expand_path('../../lib/packr', __FILE__)

spec = Oyster.spec do
  name    "packr -- JavaScript code compressor based on Dean Edwards' Packer"
  
  synopsis <<-EOS
  packr [OPTIONS] INPUT_FILES > OUTPUT_FILE
  cat INPUT_FILES | packr [OPTIONS] > OUTPUT_FILE
  EOS
  
  description <<-EOS
  PackR is a program for compressing JavaScript programs. It can remove
  whitespace and comments, compress local variable names, compress/obfuscate
  private identifiers, and encode the program in base-62.
  
  When invoked from the command line, it concatenates all the code in
  INPUT_FILES (or from standard input) and compresses the code using the given
  options, printing the result to standard output. You can pipe this output into
  another file to save it.
  EOS
  
  flag    :'shrink-vars',   :default => true,
  :desc => 'Shrink local variable names inside functions'
  
  flag    :private,         :default => false,
  :desc => 'Obfuscate private identifiers, i.e. names beginning with a single underscore'
  
  flag    :base62,          :default => false,
  :desc => 'Encode the program using base 62'
  
  array   :protect,         :default => [],
  :desc => 'List of variable names to protect from compression when using --shrink-vars'
  
  notes <<-EOS
  This program is not a JavaScript parser, and rewrites your files using regular
  expressions. Be sure to include semicolons and braces everywhere they are
  required so that your program will work correctly when packed down to a single
  line.
  
  By far the most efficient way to serve JavaScript over the web is to use PackR
  with the --shrink-vars flag, combined with gzip compression. If you don't have
  access to your server config to set up mod_deflate, you can generate gzip
  files using (on Unix-like systems):
  
    packr -s my-file.js | gzip > my-file.js.gz
    
  You can then get Apache to serve the files by putting this in your .htaccess
  file:
  
    AddEncoding gzip .gz
    RewriteCond %{HTTP:Accept-encoding} gzip
    RewriteCond %{HTTP_USER_AGENT} !Safari
    RewriteCond %{REQUEST_FILENAME}.gz -f
    RewriteRule ^(.*)$ $1.gz [QSA,L]
  
  If you really cannot serve gzip files, use the --base62 option to further
  compress your code. This mode is at its best when compressing large files with
  many repeated tokens.
  
  The --private option can be used to stop other programs calling private
  methods in your code by renaming anything beginning with a single underscore.
  Beware that you should not use this if the generated file contains 'private'
  methods that need to be accessible by other files. Also know that all the
  files that access any particular private method must be compressed together so
  they all get the same rewritten name for the private method.
  EOS
  
  author <<-EOS
  Original JavaScript version by Dean Edwards, Ruby port by James Coglan <jcoglan@googlemail.com>
  EOS
  
  copyright <<-EOS
  Copyright (c) 2004-2011 Dean Edwards, James Coglan. This program is free
  software, distributed under the MIT license.
  EOS
end

begin
  opts = spec.parse
  
  inputs = opts[:unclaimed]
  code = inputs.empty? ?
      $stdin.read :
      inputs.map { |f| File.read(f) }.join("\n")
  
  $stdout.puts Packr.pack(code,
    :shrink_vars => !!opts[:'shrink-vars'],
    :protect     => opts[:protect],
    :private     => !!opts[:private],
    :base62      => !!opts[:base62])
  
rescue Oyster::HelpRendered
end