SearchWarrant

A library to trace method calls on any given ruby class. Use with caution!

Danger

This library was written primarily as a fun meta-programming chalenge; it's not intended for use in production!

For one thing, this library could be massively simplified by utilising Module#prepend. I intentionally used Module#include instead, to make the challenge more interesting.

Moreover, core ruby actually provides a built-in means of tracing method calls: TracePoint. Therefore this functionality could instead be achieved via:

Tracepoint.new(:call, :c_call, :return, :c_return) do |trace|
  # ...
end

Now with that said, here's how this library works:

Installation

The usual:

gem install search_warrant

Usage

class Foo
  include SearchWarrant # <-- !!!

  def hello(x)
    greeting('hello', x)
  end

  private

  def greeting(intro, message)
    "#{intro}, #{message}".capitalize
  end
end

Foo.new.hello('world')

==> In (irb):14:in `irb_binding'
    Calling #<Foo:0x00000001674250>.hello("world")
  ==> In (irb):4:in `hello'
      Calling #<Foo:0x00000001674250>.greeting("hello", "world")
  <== Returns "Hello, world"
<== Returns "Hello, world"

 => "Hello, world"

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/tom-lord/search_warrant. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

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