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#!/usr/bin/ruby
require 'rubygems/package'
module RubyGemsReq
module Helpers
# Expands '~>' and '!=' gem requirements.
def self.expand_requirement(requirements)
requirements.inject([]) do |output, r|
output.concat case r.first
when '~>'
expand_pessimistic_requirement(r)
when '!='
# If there is only the conflict requirement, we still need to depend
# on the specified gem.
if requirements.size == 1
Gem::Requirement.default.requirements
else
[]
end
else
[r]
end
end.reject {|r| r.empty? }
end
# Expands the pessimistic version operator '~>' into equivalent '>=' and
# '<' pair.
def self.expand_pessimistic_requirement(requirement)
next_version = Gem::Version.create(requirement.last).bump
return ['>=', requirement.last], ['<', next_version]
end
# Converts Gem::Requirement into array of requirements strings compatible
# with RPM .spec file.
def self.requirement_versions_to_rpm(requirement)
self.expand_requirement(requirement.requirements).map do |op, version|
version == Gem::Version.new(0) ? "" : " #{op} #{version}"
end
end
# Compose dependency together with its requirements in RPM rich dependency
# string.
def self.compose_dependency_string(name, requirements)
dependency_strings = requirements.map { |requirement| name + requirement }
dependency_string = dependency_strings.join(' with ')
dependency_string.prepend('(').concat(')') if dependency_strings.length > 1
dependency_string
end
end
# Report RubyGems dependency, versioned if required.
def self.rubygems_dependency(specification)
dependency_name = "ruby(rubygems)"
requirements = Helpers::requirement_versions_to_rpm(specification.required_rubygems_version)
puts Helpers::compose_dependency_string(dependency_name, requirements)
end
# Report all gem dependencies including their version.
def self.gem_depenencies(specification)
specification.runtime_dependencies.each do |dependency|
dependency_name = "rubygem(#{dependency.name})"
requirements = Helpers::requirement_versions_to_rpm(dependency.requirement)
puts Helpers::compose_dependency_string(dependency_name, requirements)
end
end
# Reports all requirements specified by all provided .gemspec files.
def self.requires
while filename = gets
filename.strip!
begin
specification = Gem::Specification.load filename
rubygems_dependency(specification)
gem_depenencies(specification)
rescue => e
# Ignore all errors.
end
end
end
end
if __FILE__ == $0
RubyGemsReq::requires
end