Guard for exercism

.zshrc

# Append this alias to your .zshrc or .bashrc
#
# Run `guardme` from any exercise directory to start guard
# with your custom Guardfile
alias guardme="guard --guardfile ~/exercism/ruby/Guardfile"

Guardfile

# Place this file in ~/exercism/ruby
#
# This runs minitest, followed by rubocop
#
# https://paulfioravanti.com/blog/2018/01/11/setting-up-a-ruby-development-environment-for-exercism/
group :red_green_refactor, half_on_fail: true do
  guard :minitest, cli: '--pride', test_folders: ['.'] do
    # Re-test files when they're modified
    watch(%r{\A.+_test\.rb\z}) { |m| "./#{m[1]}" }
    # Run the test file of the file that was edited
    watch(%r{\A(.+)(?<!_test)\.rb\z}) { |m| "./#{m[1]}_test.rb" }
  end

  guard :rubocop do
    # Only run Rubocop over implementation files
    # as test files are not written by students.
    watch(%r{\A(.+)(?<!_test)\.rb\z})
    watch(%r{(?:.+/)?\.rubocop\.yml\z}) { |m| File.dirname(m[0]) }
  end
end