Parse rpm spec file

spec_parser.rb

# a naive version outputing a map of binaries and packages

class SpecParser
  module Tag
    REQUIRES       = /^Requires:/
    BUILD_REQUIRES = /^BuildRequires:/
  end

  class << self
    attr_reader :spec_file

    def load_file path
      @spec_file = File.read path if File.exists? path
    end

    def parse path
      load_file path
      matched_lines = []
      dependencies  = {:binaries=>[], :packages=>[]}
      if spec_file
        spec_file.each_line do |line|
          matched_lines << line if line.match Tag::REQUIRES
        end
      end
      rpm_macro_pattern = /(%\{.*?\})/
      matched_lines.each do |line|
        line.slice! Tag::REQUIRES       # remove the tag
        while line.match rpm_macro_pattern  # remove macros
          line.slice! rpm_macro_pattern
        end
        line.split.grep(/[a-zA-Z]/).each do |dep|
          if dep.match /\A\//
            dependencies[:binaries] << dep
          else
            dependencies[:packages] << dep
          end
        end
      end
      dependencies
    end
  end
end

Macros must be enclosed with %{} otherwise they are not detected by the simple regex