A rake task to update the documentation in the gh-pages branch.

docs.rake

namespace :docs do
  desc "Updates the documentation on the gh-pages branch"
  task :update do
    branch = `git symbolic-ref --short HEAD`.chomp
    if "master" != branch
      puts "You are on the #{branch} branch. You must be on the master branch to run this rake task."
      exit
    end

    require_relative "../lib/my_gem/version.rb"

    puts `git checkout gh-pages`
    puts `git rm -rf doc/`
    puts `git commit -am "Update documentation to #{MyGem::VERSION}"`
    puts `git checkout master`
    puts `rake docs`
    puts `git add doc/`
    puts `git checkout gh-pages`
    puts `git add doc/`
    puts `git commit --amend --no-edit`
    puts `git checkout master`
  end
end