overcommit validate puppet syntax

.overcommit.yml

PreCommit:
  PuppetValidate:
    enabled: true
    description: 'Validates puppet syntax'
    include: '**/*.pp'

puppet_validate.rb

# .git-hooks/pre_commit/puppet_validate.rb
module Overcommit::Hook::PreCommit
  class PuppetValidate < Base
    def run
      errors = []

      result = execute(%w(puppet parser validate), :args => applicable_files)
      return :pass if result.success?

      [:fail, result.stderr]
    end
  end
end