Bringhurst

Bringhurst watches you run your methods, infers their types, and formats the results. It does this by aliasing each method in a user-defined collection of classes and noting the types of their arguments and results.

Disclaimer: This is still just a prototype! Don't use it for anything serious just yet!

Installation

Add this line to your application's Gemfile:

gem "bringhurst"

And then execute:

$ bundle

Or install it yourself as:

$ gem install bringhurst

Usage

Once Bringhurst is installed, you'll need to tell it which classes to observe and when to display the results. I recommend setting it up in your spec_helper by doing something like:

require "bringhurst"

RSpec.configure do |config|
  # ...
  observer = Bringhurst::TypeObserver.new

  config.before(:suite) do
    observer.observe_class(Gitsh::CapturingEnvironment)
    observer.observe_class(Gitsh::Completer)
    observer.observe_class(Gitsh::Environment)
  end

  config.after(:suite) do
    puts Bringhurst::Formatter.new(observer.method_calls)
  end
  # ...
end

Next, run the tests:

$ rspec

And see the results:

...........................................
Observed Type Signatures
========================
Gitsh::CapturingEnvironment#captured_output :: String
Gitsh::CapturingEnvironment#output_stream :: IO
Gitsh::Completer#call :: String -> Array
Gitsh::Environment#[]= :: String -> String -> String
Gitsh::Environment#[]= :: Symbol -> String -> String
Gitsh::Environment#config_variables :: Hash
Gitsh::Environment#error_stream :: StringIO
Gitsh::Environment#fetch :: String -> Proc -> NilClass
Gitsh::Environment#fetch :: String -> Proc -> String
Gitsh::Environment#fetch :: String -> String
Gitsh::Environment#fetch :: String -> TrueClass -> Proc -> String
Gitsh::Environment#fetch :: Symbol -> Proc -> String
Gitsh::Environment#fetch :: Symbol -> String
Gitsh::Environment#git_aliases :: Array
Gitsh::Environment#git_command :: FalseClass -> String
Gitsh::Environment#git_command :: String
Gitsh::Environment#git_command :: TrueClass -> String
Gitsh::Environment#git_command= :: String -> String
Gitsh::Environment#git_commands :: RSpec::Mocks::Double
Gitsh::Environment#input_stream :: IO
Gitsh::Environment#input_stream :: RSpec::Mocks::Double
Gitsh::Environment#output_stream :: IO
Gitsh::Environment#output_stream :: RSpec::Mocks::Double
Gitsh::Environment#output_stream :: StringIO
Gitsh::Environment#print :: String -> NilClass
Gitsh::Environment#puts :: String -> NilClass
Gitsh::Environment#puts_error :: String -> NilClass
Gitsh::Environment#readline_version :: String
Gitsh::Environment#repo_config_color :: String -> String -> RSpec::Mocks::Double
Gitsh::Environment#repo_current_head :: RSpec::Mocks::Double
Gitsh::Environment#repo_has_modified_files? :: RSpec::Mocks::Double
Gitsh::Environment#repo_has_untracked_files? :: RSpec::Mocks::Double
Gitsh::Environment#repo_heads :: RSpec::Mocks::Double
Gitsh::Environment#repo_initialized? :: RSpec::Mocks::Double
Gitsh::Environment#tty? :: FalseClass
Gitsh::Environment#tty? :: TrueClass

(I'm hijacking the lovely gitsh here for my examples.)

You can use it in places other than tests, but I wouldn't recommend it -- it'll definitely adversely affect performance.

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 in version.rb, 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/hrs/bringhurst.

Weird name.

"Bringhurst" references one of my favorite observers of types.