#!/usr/bin/env ruby
# -*- coding: utf-8 -*-

$: << File.expand_path('../../lib/', __FILE__) if File.directory?(File.expand_path('../../lib/', __FILE__)) # MERGIT: skip
require 'mergit'
require 'optparse'

class MergitProgram
  attr_accessor :output
  attr_reader   :input

  def err msg
    $stderr.puts "* error: #{msg}"
    exit 1
  end

  def debug msg
    $stderr.puts "* debug: #{msg}"
  end

  def mergit
    @mergit ||= Mergit.new()
  end

  def parse_options
    # Defaults
    @output = $stdout

    # Parser
    optparse = OptionParser.new do |opts|
      opts.banner =    "Usage: #{opts.program_name} [OPTIONS] ruby-file"
      opts.define_head "Merges all require's found in the specified lib directories into one ruby file."
      opts.separator   ''

      opts.on('-l', '--lib DIR', String,
              "Adds DIR to the list of directories to look for require'd files. Can be specified multiple times.") do |d|
        d = Pathname.new(d)
        if d.directory?
          mergit.search_path.unshift d.realpath.to_s
        else
          err "'#{d}' is not a directory."
        end
      end

      opts.on('-r', '--replace MATCH=REPLACEMENT', String,
             "Replaces all occurrences of MATCH with REPLACEMENT. If MATCH is between / characters, then it'll be used as a case-sensitive regexp. Can be specified multiple times.") do |m|
        match, replace = m.split(/=/)
        match = Regexp.new(match.slice(1..-2)) if match.start_with?('/') && match.end_with?('/')
        mergit.replacements[match] = replace
      end

      opts.on('-d', '--debug', "Turn on debugging.") do
        @debug = true
      end
      opts.on('-o', '--output FILE', String,
              "Where to output the merged ruby script.") do |f|
        @output = File.open(f, 'w') unless '-' == f
      end

      opts.on_tail('-V', '--version', 'Show the version.') do
        $stderr.puts "#{opts.program_name} version: #{Mergit::VERSION}"
        exit
      end

      opts.on_tail('-h', '--help', 'This Help.') do
        $stderr.puts opts
        exit
      end
    end

    arguments = optparse.parse!

    if arguments.size == 0
      err "You need to specify the ruby file to merge."
    elsif arguments.size > 1
      err "You can only specify one ruby file to merge at a time."
    end

    if '-' == arguments.first
      @input = $stdin
    else
      @input = File.open(arguments.first, 'r')
    end
  end

  def run
    parse_options
    debug "Search Path: #{mergit.search_path.inspect}"
    debug "Input:       #{input.inspect}"
    debug "Output:      #{output.inspect}"
    input_string = @input.read
    @input.close
    output_string = mergit.process(input_string)
    @output.write output_string
  end
end

if __FILE__ == $0
  MergitProgram.new.run
end

# EOF