ディレクトリ内に参照されていないtexファイルがないか調べる

reference.rb

# /usr/bin/ruby

class Finder
    attr_reader :source_file_name
    def initialize
        source_file = ARGV[0]
        unless source_file
            warn "usage: ruby reference.rb SOURCE_FILE"
            exit 1
        end
        @source_file_path = File.expand_path(source_file)
    end

    def get_unreferenced_files
        files = get_tex_files(File::dirname(@source_file_path))
        referenced_files = get_referenced_files(@source_file_path)

		files.each do |file| file.downcase! end
		referenced_files.each do |file| file.downcase! end
		@source_file_path.downcase!

        files - referenced_files - [@source_file_path]
    end

    def get_referenced_files(file_name)
        result = Array.new
        File.open(file_name).each do |line|
            path = make_path(line)
            result = result | get_referenced_files(path) | [path] if not path == nil
        end
        result
    end

    def make_path(line)
        begin
            if /\.tex/ =~ line and line[0] != "%"
                path = line.scan(/{([\s]*[^\{\}]*\.tex)[\s]*}/)[0][0]
            end
            path = make_absolute_path(path)
            path if FileTest::exist?(path)
        rescue
            nil
        end
    end

    def make_absolute_path(path)
        path = path[2..path.length()] if path =~ /^.\//
            File::dirname(@source_file_path) + "/" + path
    end

    def get_tex_files(path)
        result = Array.new
        Dir::foreach(path) do |file_name|
            next if file_name == "." or file_name == ".."
            if file_name =~ /.tex$/
                if path =~ /\/$/
                    result <<  path + file_name
                else
                    result <<  path + "/" + file_name
                end
            end

            if FileTest::directory?(path+"/"+file_name)
                result = result | get_tex_files(path+"/"+file_name)
            end
        end
        result
    end
end

finder = Finder.new
puts finder.get_unreferenced_files