elixir-style function chaining that is also awful!

pipes.rb

require 'pp'

class Object
  def mutate
    Mutagen.new(self)
  end
end

class Mutagen < BasicObject
  def initialize(collection)
    @collection = collection
  end

  def method_missing(method_name, *args, &block)

    return const_method_missing(method_name) if probably_constant(method_name)
    instance_method_missing(method_name, *args, &block)
  end

  private

  def const_method_missing(method_name)
    const_callee = ::Kernel.const_get method_name
    ::ConstMutation.new const_callee, @collection
  end

  def instance_method_missing(method_name, *args, &block)
    callee = @collection
    ::SelfMutation.new(@collection, method_name, args, block).invoke
  end

  def probably_constant(method_name)
    method_name_start = method_name.to_s.chars.first
    is_uppercase = method_name_start.upcase == method_name_start
  end
end

class SelfMutation < BasicObject
  def initialize(collection, method_name, args, block)
    @collection = collection
    @method_name = method_name
    @args = args
    @block = block
  end

  def invoke
    ::Mutagen.new @collection.send(@method_name, *@args, &@block)
  end
end

class ConstMutation < BasicObject
  def initialize(callee, collection)
    @callee = callee
    @collection = collection
  end

  def method_missing(method_name, *args, &block)
    returned = @callee.send method_name, @collection, *args, &block
    ::Mutagen.new returned
  end
end

module Manipulator
  def self.filter(collection, block)
    collection.select &block
  end
end

module Printer
  def self.pretty_print(collection)
    pp collection
  end
end

pp @collection = (1..20).to_a

@collection.mutate
  .Manipulator.filter( ->(x) { x.even? } )
  .shuffle
  .take(5)
  .Printer.pretty_print

"steve".mutate
  .upcase
  .chars
  .to_a
  .Manipulator.filter( ->(x) { x.ord > 'F'.ord})
  .join
  .Printer.pretty_print

# visualize:
# collection
# |> Manipulator.filter(fn(x) -> is_even(x) end)
# |> Printer.pretty_print

Would you mind if I borrow your const_method_missing idea and add it to my chainable_methods gem? Or if you want to send a PR with that I'd be thrilled :-)

@akitaonrails, @bkerley, have you seen this trick with >-> 'operator' https://github.com/txus/kleisli
;)

# check out this more verbose, but explicit style
CM("hello http:///www.google.com world")
  |-> text { URI.extract(text) }
      .first
  |-> uri { URI.parse(uri) }
  |-> url { open(url) }
      .read
  |-> html { HTML.parse(html) }
      .css("h1")
      .first
      .text
      .strip

It feels like current solution with . is not very friendly to method's like Array(42), URI("http://foo.com/"), etc...
I wonder if single argument functions (with unnamed arguments) are too simple?
Good DSLs are pretty often chainable out of the box without pipelines -- but 'connecting' others sure sounds very interesting.

Thank you for sharing!