Guard::MtHaml 
This is a Guard wrapper to compile Haml to PHP, Twig or static HTML.
Add to your Gemfile:
gem 'guard-mthaml'
Require in your Guardfile:
require "guard/mthaml"
Or, add the default Guard::MtHaml template to your Guardfile by running:
$ guard init mthaml
Usage
Requires that php be executable via command line.
###
# Sample Guardfile block for Guard::MtHaml
#
# :input ("views/src") set output directory for compiled files
# :output ("views") set input directory with haml files
# :environment ("php") haml environment
# :notifications (true) toggle guard notifications
# :compress_output (false) compress compiled haml files
# :static_files (false) compile haml to static html
# :run_at_start (true) compile files when guard starts
###
guard :mthaml, :input => "views/src", :output => "views"