Rakefile

require "bundler/gem_tasks"

desc %(Starts the test server and opens it in a web browser)
multitask develop: ["test:server", "test:open"]

desc %(Build source files into dist/rails-ujs.js)
task :build do
  system "bundle exec blade build"
end

task default: :develop

PORT = 4567

namespace :test do
  desc %(Starts the test server)
  task :server do
    system "bundle exec ruby test/server.rb"
  end

  desc %(Starts the test server which reloads everything on each refresh)
  task :reloadable do
    system "bundle exec shotgun test/config.ru -p #{PORT} --server thin"
  end

  task :open do
    url = "http://localhost:#{PORT}"
    puts "Opening test app at #{url} ..."
    sleep 3
    system(*browse_cmd(url))
  end
end

# Returns an array e.g.: ['open', 'http://example.com']
def browse_cmd(url)
  require "rbconfig"
  browser = ENV["BROWSER"] ||
    (RbConfig::CONFIG["host_os"].include?("darwin") && "open") ||
    (RbConfig::CONFIG["host_os"] =~ /msdos|mswin|djgpp|mingw|windows/ && "start") ||
    %w[xdg-open x-www-browser firefox opera mozilla netscape].find { |comm| which comm }

  abort("ERROR: no web browser detected") unless browser
  Array(browser) << url
end

# which('ruby') #=> /usr/bin/ruby
def which(cmd)
  exts = ENV["PATHEXT"] ? ENV["PATHEXT"].split(";") : [""]
  ENV["PATH"].split(File::PATH_SEPARATOR).each do |path|
    exts.each { |ext|
      exe = "#{path}/#{cmd}#{ext}"
      return exe if File.executable? exe
    }
  end
  return nil
end