hamlize

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

require "fileutils"
require "pathname"

include FileUtils

class Pathname
  def replace_extname(new_ext)
    dirname.join(basename.to_s.sub(/#{Regexp.escape(extname)}$/, new_ext))
  end

  def append_underscore
    if basename.to_s =~ /^_/
      replaced_basename = "_#{basename.to_s}"
    else
      replaced_basename = "__#{basename.to_s}"
    end

    dirname.join(replaced_basename)
  end
end

unless system("which html2haml > /dev/null 2>&1")
  puts <<-MSG
  [ERROR] Please install html2haml.
  $ gem install html2haml
  MSG
  exit 1
end

eruby = ARGV[0]
if eruby.nil?
  puts "[ERROR] Please specify the file name to convert."
  exit 1
end

eruby = Pathname(eruby)
unless eruby.exist?
  puts <<-MSG
  [ERROR] Specified file does not exists.
  specified file: #{eruby}
  MSG
  exit 1
end

unless eruby.extname == ".erb"
  puts <<-MSG
  [ERROR] Specified file is not looks like ERuby file.
  specified file: #{eruby}
  MSG
  exit 1
end

haml = eruby.replace_extname(".haml")
if haml.exist?
  puts <<-MSG
  [ERROR] Haml file has already exists.
  Please confirm and remove it if you want to continue the process.
  REPLACED FILENAME: #{haml}
  MSG
  exit 1
end

underscored_eruby = eruby.append_underscore
if underscored_eruby.exist?
  puts <<-MSG
  [ERROR] Underscored file has already exists.
  Please confirm and remove it if you want to continue the process.
  UNDERSCORED FILENAME: #{underscored_eruby}
  MSG
  exit 1
end


# MAIN

`html2haml #{eruby} #{haml}`
`mv #{eruby} #{underscored_eruby}`