linkdeps.rb

#!/usr/bin/env ruby

require 'fileutils'
require 'rubygems'

gem_dirs = []
basedir = 'deps'
FileUtils.mkdir_p(basedir)

ARGV.each do |gemset|
  File.open(gemset, 'r').each_line do |line|
    next if line =~ /^#.*/

    line = line.gsub(' -v', '-')

    Gem.path.each do |gempath|
      gemdir = File.join(gempath, 'gems', line.strip)

      if File.directory?(gemdir)
        gem_dirs << gemdir
        break
      end
    end
  end
end

def recursive_link(src, dst)
  if File.directory?(src)
    srcname = File.basename(src)
    fulldst = File.join(dst, srcname)
    FileUtils.mkdir_p(fulldst)
    Dir.entries(src).each do |entry|
      next if ['.', '..'].include? entry
      recursive_link(File.join(src, entry), fulldst)
    end
  else
    begin
      FileUtils.ln_sf(src, dst)
    rescue
      puts "Warning: #{$!.message}"
    end
  end
end

gem_dirs.each do |gem_dir|
  Dir.entries(gem_dir).each do |dir|
    next if ['.', '..', 'spec'].include? dir
    recursive_link(File.join(gem_dir, dir), basedir)
  end
end