rev_parse

in lib/grit/git-ruby.rb [74:114]

• 26 lines of code
• 11 McCabe index (conditional complexity)

    def rev_parse(options, string)
      raise RuntimeError, "invalid string: #{string.inspect}" unless string.is_a?(String)

      
      
      
      if string !~ /:/ && string =~ /\.\./
        (sha1, sha2) = string.split('..')
        return [rev_parse({}, sha1), rev_parse({}, sha2)]
      end

      if /^[0-9a-f]{40}$/.match(string)  
        return string.chomp
      end

      head = File.join(@git_dir, 'refs', 'heads', string)
      return File.read(head).chomp if File.file?(head)

      head = File.join(@git_dir, 'refs', 'remotes', string)
      return File.read(head).chomp if File.file?(head)

      head = File.join(@git_dir, 'refs', 'tags', string)
      return File.read(head).chomp if File.file?(head)

      
      packref = File.join(@git_dir, 'packed-refs')
      if File.file?(packref)
        File.readlines(packref).each do |line|
          if m = /^(\w{40}) refs\/.+?\/(.*?)$/.match(line)
            next if !Regexp.new(Regexp.escape(string) + '$').match(m[3])
            return m[1].chomp
          end
        end
      end

      

      
      return method_missing('rev-parse', options, string).chomp
    end