class Sass::Exec::SassConvert

def common_options(opts)
  opts.separator ''
  opts.separator 'Common Options:'
  opts.on('-F', '--from FORMAT',
    'The format to convert from. Can be css, scss, sass.',
    'By default, this is inferred from the input filename.',
    'If there is none, defaults to css.') do |name|
    @options[:from] = name.downcase.to_sym
    raise "sass-convert no longer supports LessCSS." if @options[:from] == :less
    unless [:css, :scss, :sass].include?(@options[:from])
      raise "Unknown format for sass-convert --from: #{name}"
    end
  end
  opts.on('-T', '--to FORMAT',
    'The format to convert to. Can be scss or sass.',
    'By default, this is inferred from the output filename.',
    'If there is none, defaults to sass.') do |name|
    @options[:to] = name.downcase.to_sym
    unless [:scss, :sass].include?(@options[:to])
      raise "Unknown format for sass-convert --to: #{name}"
    end
  end
  opts.on('-i', '--in-place',
    'Convert a file to its own syntax.',
    'This can be used to update some deprecated syntax.') do
    @options[:in_place] = true
  end
  opts.on('-R', '--recursive',
      'Convert all the files in a directory. Requires --from and --to.') do
    @options[:recursive] = true
  end
  opts.on("-?", "-h", "--help", "Show this help message.") do
    puts opts
    exit
  end
  opts.on("-v", "--version", "Print the Sass version.") do
    puts("Sass #{Sass.version[:string]}")
    exit
  end
end

def initialize(args)
  super
  require 'sass'
  @options[:for_tree] = {}
  @options[:for_engine] = {:cache => false, :read_cache => true}
end

def input_and_output(opts)
  opts.separator ''
  opts.separator 'Input and Output:'
  opts.on('-s', '--stdin', :NONE,
          'Read input from standard input instead of an input file.',
          'This is the default if no input file is specified. Requires --from.') do
    @options[:input] = $stdin
  end
  encoding_option(opts)
  opts.on('--unix-newlines', 'Use Unix-style newlines in written files.',
                             ('Always true on Unix.' unless Sass::Util.windows?)) do
    @options[:unix_newlines] = true if Sass::Util.windows?
  end
end

def miscellaneous(opts)
  opts.separator ''
  opts.separator 'Miscellaneous:'
    opts.on('--cache-location PATH',
            'The path to save parsed Sass files. Defaults to .sass-cache.') do |loc|
      @options[:for_engine][:cache_location] = loc
    end
  opts.on('-C', '--no-cache', "Don't cache to sassc files.") do
    @options[:for_engine][:read_cache] = false
  end
  opts.on('-q', '--quiet', 'Silence warnings and status messages during conversion.') do |bool|
    @options[:for_engine][:quiet] = bool
  end
  opts.on('--trace', :NONE, 'Show a full Ruby stack trace on error') do
    @options[:trace] = true
  end
end

def path_for(file)
  return file.path if file.is_a?(File)
  return file if file.is_a?(String)
end

def process_directory
  @options[:input] = @args.shift
  unless @options[:input]
    raise "Error: directory required when using --recursive."
  end
  output = @options[:output] = @args.shift
  raise "Error: --from required when using --recursive." unless @options[:from]
  raise "Error: --to required when using --recursive." unless @options[:to]
  unless File.directory?(@options[:input])
    raise "Error: '#{@options[:input]}' is not a directory"
  end
  if @options[:output] && File.exist?(@options[:output]) &&
    !File.directory?(@options[:output])
    raise "Error: '#{@options[:output]}' is not a directory"
  end
  @options[:output] ||= @options[:input]
  if @options[:to] == @options[:from] && !@options[:in_place]
    fmt = @options[:from]
    raise "Error: converting from #{fmt} to #{fmt} without --in-place"
  end
  ext = @options[:from]
  Sass::Util.glob("#{@options[:input]}/**/*.#{ext}") do |f|
    output =
      if @options[:in_place]
        f
      elsif @options[:output]
        output_name = f.gsub(/\.(c|sa|sc|le)ss$/, ".#{@options[:to]}")
        output_name[0...@options[:input].size] = @options[:output]
        output_name
      else
        f.gsub(/\.(c|sa|sc|le)ss$/, ".#{@options[:to]}")
      end
    unless File.directory?(File.dirname(output))
      puts_action :directory, :green, File.dirname(output)
      FileUtils.mkdir_p(File.dirname(output))
    end
    puts_action :convert, :green, f
    if File.exist?(output)
      puts_action :overwrite, :yellow, output
    else
      puts_action :create, :green, output
    end
    process_file(f, output)
  end
end

def process_file(input, output)
  input_path, output_path = path_for(input), path_for(output)
  if input_path
    @options[:from] ||=
      case input_path
      when /\.scss$/; :scss
      when /\.sass$/; :sass
      when /\.less$/; raise "sass-convert no longer supports LessCSS."
      when /\.css$/; :css
      end
  elsif @options[:in_place]
    raise "Error: the --in-place option requires a filename."
  end
  if output_path
    @options[:to] ||=
      case output_path
      when /\.scss$/; :scss
      when /\.sass$/; :sass
      end
  end
  @options[:from] ||= :css
  @options[:to] ||= :sass
  @options[:for_engine][:syntax] = @options[:from]
  out =
    Sass::Util.silence_sass_warnings do
      if @options[:from] == :css
        require 'sass/css'
        Sass::CSS.new(read(input), @options[:for_tree]).render(@options[:to])
      else
        if input_path
          Sass::Engine.for_file(input_path, @options[:for_engine])
        else
          Sass::Engine.new(read(input), @options[:for_engine])
        end.to_tree.send("to_#{@options[:to]}", @options[:for_tree])
      end
    end
  output = input_path if @options[:in_place]
  write_output(out, output)
rescue Sass::SyntaxError => e
  raise e if @options[:trace]
  file = " of #{e.sass_filename}" if e.sass_filename
  raise "Error on line #{e.sass_line}#{file}: #{e.message}\n  Use --trace for backtrace"
rescue LoadError => err
  handle_load_error(err)
end

def process_result
  require 'sass'
  if @options[:recursive]
    process_directory
    return
  end
  super
  input = @options[:input]
  if File.directory?(input)
    raise "Error: '#{input.path}' is a directory (did you mean to use --recursive?)"
  end
  output = @options[:output]
  output = input if @options[:in_place]
  process_file(input, output)
end

def read(file)
  if file.respond_to?(:read)
    file.read
  else
    open(file, 'rb') {|f| f.read}
  end
end

def set_opts(opts)
  opts.banner = <<END
e: sass-convert [options] [INPUT] [OUTPUT]
ription:
nverts between CSS, indented syntax, and SCSS files. For example,
is can convert from the indented syntax to SCSS, or from CSS to
SS (adding appropriate nesting).
  common_options(opts)
  style(opts)
  input_and_output(opts)
  miscellaneous(opts)
end

def style(opts)
  opts.separator ''
  opts.separator 'Style:'
  opts.on('--dasherize', 'Convert underscores to dashes.') do
    @options[:for_tree][:dasherize] = true
  end
  opts.on(
    '--indent NUM',
    'How many spaces to use for each level of indentation. Defaults to 2.',
    '"t" means use hard tabs.'
  ) do |indent|
    if indent == 't'
      @options[:for_tree][:indent] = "\t"
    else
      @options[:for_tree][:indent] = " " * indent.to_i
    end
  end
  opts.on('--old', 'Output the old-style ":prop val" property syntax.',
                   'Only meaningful when generating Sass.') do
    @options[:for_tree][:old] = true
  end
end