Rebuild PHP files in a directory, showing warnings when they fail

build.watchr

require 'open3'
require 'rainbow'
require 'fileutils'

static_dir = 'static'

def growl(title, message)
  system %{growlnotify -m "#{message}" "#{title}"}
end

puts "Watching for changes...".foreground(:yellow)
growl("Watching...", "Watching for changes...")

def rebuild_file(match)
  target = File.join(static_dir, match[1]) + ".html"
  print "Rebuilding #{target.bright}:".foreground(:yellow)
  STDOUT.flush

  output = nil
  errors = nil
  Open3.popen3(%{php #{match[0]}}) do |stdin, stdout, stderr|
    output = stdout.read
    errors = stderr.read
  end

  if !errors.empty?
    growl("FAILURE", errors)
    print " [FAILURE]".foreground(:red)
    puts
    puts "PHP errors below:".foreground(:red).bright
    puts errors
  else
    growl("SUCCESS", target)
    print " [success]".foreground(:green)

  FileUtils.mkdir_p File.split(target).first
    File.open(target, 'w') { |fh| fh.print output }
  end
  puts

  STDOUT.flush
end

php_match = '(.*)\.php$'

watch('php.watchr') { p exec %{watchr php.watchr} }
watch(php_match) { |match| rebuild_file(match) }

watch('(.*)\.inc') do |match|
  Dir["**/*.php"].each { |file| FileUtils.touch(php_match.match(file)) }
end

Signal.trap('QUIT') { FileUtils.touch('php.watchr') } # Ctrl-\