Callchain

TODO: Write a gem description

Installation

Add this line to your application's Gemfile:

gem 'callchain'

And then execute:

$ bundle

Or install it yourself as:

$ gem install callchain

Usage

Individual objects, lambdas, or modules do work with ::call(object)

Compose a CallChain with the ::use method

Compose a CallChain of call chains because it exports ::call(object)

Example: Class/Module names define ::call

  class PlanScoper
    def self.call(thing)
      scope_the_thing(thing)
      thing
    end
  end

  module Quantizer
    def self.call(thing)
      quantize_the_thing(thing)
      thing
    end
  end

  class Pricer
    extend CallChain
    use PlanScoper, Quantizer, AppGrouper
    use UserGrouper
  end

  statement = Statement.new
  Pricer.call(statement)

Example: lambda-friendly

  class Debugger
    extend CallChain
    use lambda { |thing| p thing; thing }
  end

  Debugger.call(Object.new)

Example: composable

  class CompositeCallChain
    extend CallChain
    use Debugger
  end

  CompositeCallChain.call(Object.new)

CallChain::bind

  class WrapToI
    extend CallChain
    use CallChain[:to_i]
  end

  WrapToI.call('1')
  # => 1

  class WrapToI
    extend CallChain
    use CallChain.bind(:+, 1)
  end

  WrapToI.call(1)
  # => 2

Contributing

1. Fork it ( http://github.com//callchain/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request