MatchingExceptions

Rescues exceptions using pattern matching.

Usage example:

  def foo
    raise StandardError.new('foo bar')
  rescue ME.matches(/bar/)
    puts 'it works!'
  end

  pry(main)> foo
  # it works!

An ideal use case for this gem:

Old code

  def bar
    do_something_complicated
  rescue StandardError => e
    if e.message =~ /some kind of error/
      treat_error
    else
      treat_rest
    end
  end

New code

  def bar
    do_something_complicated
  rescue ME.matches(/some kind of error/)
    treat_error
  rescue StandardError
    treat_rest
  end

Installation

Add this line to your application's Gemfile:

gem 'matching_exceptions'

And then execute:

$ bundle

Or install it yourself as:

$ gem install matching_exceptions

Usage

Call ME.matches(something) in a rescue block to rescue exceptions with something.

By default, message will be matched (i.e. the exception will be rescued if e.message == something, or e.message =~ something if something is a regex).

You can also specify a custom method with the keyword argument on::

  class CustomError < StandardError
    attr_reader :my_custom_attr
  end

  ...

  begin
    raise CustomError.new('foo', 'some weird custom field')
  rescue ME.matches(/weird/, on: :my_custom_attr)
    puts 'yay!'
  end

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/guava/matching_exceptions.

License

The gem is available as open source under the terms of the MIT License.