bundler-dumpdeps

#!/usr/bin/ruby
# vim: set sw=2 sts=2 et tw=80 :
require 'bundler'

def expand_pessimistic(version)
  splitted = version.to_s.split('.')
  sub_version = splitted.slice(0,(splitted.length-1)).join('.')
  ":#{sub_version} >= #{version}"
end

def rpmify(op, version)
  case op
    when '~>'
      return expand_pessimistic(version)
    when '>='
      if version != Gem::Version.new(0)
        return " #{op} #{version}"
      end
    when '!='
      return " > #{version}"
    when '='
      return " #{op} #{version}"
    else
      STDERR.puts "Unknown operator '#{op}' called with version '#{version}'"
      exit 1
  end
end
#
# TODO: have a commaldine option to specify those.
# e.g. in mastodon you also want to skip the no_docker and heroku group
#
bad_groups = [:test, :development]
bd=Bundler::Dsl.evaluate('Gemfile', 'Gemfile.lock', {})
bd.dependencies.each do |dep|
  next if (dep.groups - bad_groups).empty?
  dep.requirement.requirements.each do |req|
    req_str = rpmify(*req)
    puts "BuildRequires:  %{rubygem #{dep.name}#{req_str}}"
  end
end

tested with discourse and redmine. even handles redmines Gemfile.local construct

works without a gemfile.lock as well