Ruby style guide git pre-commit hook using Rubocop as the style guide checker. Only runs on staged ruby files that have been added and/or modified. Itself passes rubocop with default settings.

rubocop_pre_commit_hook

#!/usr/bin/env ruby

# Source: https://gist.github.com/timheilman/1bb8da91be4b79425d67314c9ae23f6b
# credit to https://www.github.com/joneshf

require 'rubocop'

changed_files =
  `git diff --name-only --cached -- '*.rb' '*.rake'`
  .split("\n").join(' ')

system("rubocop '#{changed_files}'") unless changed_files.empty?

exit $CHILD_STATUS.to_s[-1].to_i