auto puppet-lint/syntax check via guard-shell

Guardfile

# Uses guard and guard-shell for auto lint/syntax check on saving
#
# 'gem install guard guard-shell puppet' will get you the dependencies.
# Drop this in 'Guardfile' in the root of your puppet dev directory.
#
# Run 'guard' to get started.

# Disable Pry interactor; this blocks the filesystem change listenener
# https://github.com/guard/guard/issues/357
interactor :off
notification :tmux

ignore %r{.*\.swp$}, %r{^.*~$}

guard 'shell' do
  watch(/.*\.pp/) do |m|
    exitstatus = :success
    system("echo #{m}")
    system("echo '\nLint:'")
    if ! system("puppet-lint '#{m}'")
      exitstatus = :pending
    end
    system("echo '\nSyntax:'")
    if ! system("puppet parser --verbose validate '#{m}'")
      exitstatus = :failed
    end
    n nil, nil, exitstatus
  end

  watch(/.*\.erb$/) do |m|
    exitstatus = :success
    system("echo #{m}")
    if ! system("erb -x -T - #{m} | ruby -c")
      exitstatus = :failed
    end
    n nil, nil, exitstatus
  end
end