require 'procto'

class Greeter
  include Procto.call

  def initialize(text)
    @text = text
  end

  def call
    "Hello #{@text}"
  end
end

Greeter.call('world') # => "Hello world"

class Printer
  include Procto.call(:print)

  def initialize(text)
    @text = text
  end

  def print
    "Hello #{@text}"
  end
end

Printer.call('world') # => "Hello world"

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class Greeter
  private_class_method :new
  
  def self.call(text)
    new(text).call
  end

  def initialize(text)
    @text = text
  end

  def call
    "Hello #{@text}"
  end
end

➜  procto git:(master) bundle
Updating https://github.com/rom-rb/devtools.git
Fetching gem metadata from https://rubygems.org/.........
Fetching version metadata from https://rubygems.org/...
Fetching dependency metadata from https://rubygems.org/..
Resolving dependencies...
Bundler could not find compatible versions for gem "bundler":
  In Gemfile:
    bundler (~> 1.6.1) ruby

  Current Bundler version:
    bundler (1.10.6)
This Gemfile requires a different version of Bundler.
Perhaps you need to update Bundler by running `gem install bundler`?
Could not find gem 'bundler (~> 1.6.1) ruby in any of the sources

require 'procto'

class Shouter
  include Procto.call

  def initialize(text)
    @text = text
  end

  def call
    @text.upcase
  end
end

names = %w[John Dan Marcus]

names.map(&Shouter.method(:call)) # => ["JOHN", "DAN", "MARCUS"]

class Shouter
  def self.to_proc
    public_method(:call).to_proc
  end
end

names.map(&Shouter) # => ["JOHN", "DAN", "MARCUS"]