Rakefile to Generate Emacs CTAGS

gistfile1.rb

# Generate TAGS files with bundler projects. Bundle must be updated, and tags binary
# must be exuberant ctags. 

namespace :tags do
  namespace :generate do
    desc <<-EOT
    Generate a new emacs TAGS file for the current project.
    Requires exuberant ctags and bundler.
    EOT
    task :emacs do
      `ctags -R -e -f TAGS . #{gemdirs.join(' ')}`
    end

    desc <<-EOT
    Generate a new vim TAGS file for the current project.
    Requires exuberant ctags and bundler.
    EOT
    task :vim do
      `ctags -R -f tags . #{gemdirs.join(' ')}`
    end
  end

  def gemdirs
    bundle = %x[bundle list]
    gemlist = bundle.split("\n").map do |gem|
      gem.match(/[\w\-_]+/)[0]
    end
    
    # Need to strip the first line since it contains no gem info
    gemlist.shift

    gemdirs = gemlist.map do |g|
      gemdir = %x[bundle show #{g}]
      %Q{"#{gemdir.chomp}"}
    end
  end
end