module Hoe::Bundler

def define_bundler_tasks
  desc "generate a bundler Gemfile from your Hoe.spec dependencies"
  task "bundler:gemfile" do
    File.open("Gemfile","w") do |gemfile|
      gemfile.print hoe_bundler_contents
    end
  end
end

def hoe_bundler_add_dependencies(deps, gemfile, postfix=nil)
  deps2 = {}
  deps.each do |name, version|
    version ||= ">=0"
    deps2[name] = version unless deps2.key?(name)
  end
  deps2.each do |name, version|
    output = [%Q{gem "#{name}"}]
    Array(version).each do |ver|
      output << %Q{"#{ver.gsub(/ /,'')}"}
    end
    gemfile.puts %Q{#{output.join(", ")}#{postfix}}
  end
  gemfile.puts
end

def hoe_bundler_contents
  gemfile = StringIO.new
  gemfile.puts "# -*- ruby -*-"
  gemfile.puts
  gemfile.puts "# DO NOT EDIT THIS FILE. Instead, edit Rakefile, and run `rake bundler:gemfile`."
  gemfile.puts
  gemfile.puts "source \"https://rubygems.org/\""
  gemfile.puts
  hoe_bundler_add_dependencies(self.extra_deps, gemfile)
  hoe_bundler_add_dependencies(self.extra_dev_deps, gemfile, ", :group => [:development, :test]")
  gemfile.puts "# vim: syntax=ruby"
  gemfile.rewind
  gemfile.read
end