migrate-ghq.rb

#!/usr/bin/env ruby

require 'fileutils'
require 'pathname'

class SourceRepo
  def initialize(path)
    @path = path
    @components = Pathname.new(path).each_filename.entries
    @root = ['', @components[0...-3]].join('/')
  end

  def path
    @path
  end

  def exist?
    File.exist?(@path)
  end

  def change_root(new_root)
    self.class.new(File.join(new_root, self.host, self.owner, self.name))
  end

  def root
    @root
  end

  def host
    @components[-3]
  end

  def owner
    @components[-2]
  end

  def name
    @components[-1]
  end

  def inspect
    "<#{self.class}:#{self.host}/#{self.owner}/#{self.name}>"
  end
end

ghq_root = `ghq root`.strip
source_repos = ARGV.map {|a| SourceRepo.new(a) }
source_repos.each do |src_repo|
  target_repo = src_repo.change_root(ghq_root)
  if target_repo.exist?
    puts "Skip #{src_repo.path}; Already exists"
    next
  end
  FileUtils::Verbose.mkdir_p File.dirname(target_repo.path)
  FileUtils::Verbose.mv src_repo.path, target_repo.path
end