ruby-common/rubygemsdeps.rb

#!/usr/bin/ruby

require 'optparse'
require 'rubygems/specification'

opts = OptionParser.new("Usage: #{$0}")

provides=false
opts.on("-P", "--provides", "Output the provides of the package") do |val|
    provides=true
end
requires=false
opts.on("-R", "--requires", "Output the requires of the package") do |val|
    requires=true
end
rest = opts.permute(ARGV)

unless provides || requires
  exit(0)
end

gemspecs=Array.new

$stdin.each_line do |line|
  line.match(%r{.*/specifications/.*\.gemspec$}) do |m| 
    gemspecs << [m[0], Gem::Specification.load(m[0])]
  end
end

gemspecs.each do |file, spec|
  rubyabi=nil
  file.match(%r{.*/gems/([^/]*)/.*}) do |m|
    rubyabi=m[1]
  end
  if provides
    # old forms
    puts "rubygem-#{spec.name} = #{spec.version}"
    versions = spec.version.to_s.split('.')
    puts "rubygem-#{spec.name}-#{versions[0]} = #{spec.version}" if versions.length > 0
    puts "rubygem-#{spec.name}-#{versions[0]}_#{versions[1]} = #{spec.version}" if versions.length > 1
    puts "rubygem-#{spec.name}-#{versions[0]}_#{versions[1]}_#{versions[2]} = #{spec.version}" if versions.length > 2

    # version without ruby version - asking for trouble
    puts "rubygem(#{spec.name}) = #{spec.version}"
    puts "rubygem(#{rubyabi}:#{spec.name}) = #{spec.version}" if rubyabi
  end

  if requires
    puts "ruby(abi) = #{rubyabi}" if rubyabi
    spec.runtime_dependencies.each do |dep|
      dep.requirement.requirements.each do |r|
        if r.first == '~>'
          next_version = Gem::Version.create(r.last).bump
          puts "rubygem(#{rubyabi}:#{dep.name}) >= #{r.last}"
          puts "rubygem(#{rubyabi}:#{dep.name}) < #{next_version}"
        elsif r.first == '!='
          # this is purely guessing, but we can't generate conflicts here ;(
          puts "rubygem(#{rubyabi}:#{dep.name}) > #{r.last}"
          #puts "rubygem(#{rubyabi}:#{dep.name}) < #{r.last}"
        else
          puts "rubygem(#{rubyabi}:#{dep.name}) #{r.first} #{r.last}"
        end
      end
    end
  end
end