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lock-o-motion

  • 0.1.1
  • Rubygems
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LockOMotion

Require and mock Ruby gems (including their dependencies) within RubyMotion applications

Introduction

RubyMotion is one of the latest phenomenons in the world of Ruby. It allows you to develop and test native iOS applications (for iPhone and iPad) using the Ruby language.

One of the limitations is that you are not able to use any random Ruby gem you want. It either has to be RubyMotion aware (like BubbleWrap) or RubyMotion compatible (mostly when having as minimal gem dependencies as possible and without doing things like class and instance evaluation). You are not able to require files at runtime, but that is where LockOMotion hooks in as it handles requirements for you.

Please note that although it is a valuable asset, using LockOMotion will still not let you include any random Ruby gem. But it does bring us a few steps closer towards that point.

A possible strategy is to "mock" common Ruby gems (e.g. yaml or HTTParty) using (semi) drop-in replacements which are hooked in using LockOMotion. Cause why do we have to eliminate Ruby gems because they use one or a few methods of a "blocking" Ruby dependency gem like YAML.load? Anyway, I very very well know that this is no more worth than a half solutation but it's more than nothing.

Installation

Add LockOMotion to your Gemfile

gem "lock-o-motion"

Install the gem dependencies

$ bundle

Usage

Set up your Gemfile and Rakefile

You need to setup your Gemfile by separating RubyMotion aware Ruby gems from the ones that are not. Put the RubyMotion unaware gems in the :lotion (short for LockOMotion of course) Bundler group like this:

source "http://rubygems.org"

# RubyMotion aware gems
gem "lock-o-motion"
gem "easy-button"

# RubyMotion unaware gems
group :lotion do
  gem "betty_resource"
end

Add Lotion.setup at the end of your Rakefile:

# -*- coding: utf-8 -*-

# Use `rake config' to see complete project settings.
$:.unshift "/Library/RubyMotion/lib"

require "motion/project"
require "bundler"
Bundler.require

Motion::Project::App.setup do |app|
  app.name = "Just Awesome"
  app.frameworks << "AVFoundation"
end

Lotion.setup

Run bundle install if you haven't already and then rake to run the application in your iOS-simulator. Voila! You're done ^^

Auto-generated .lotion.rb

LockOMotion generates a hidden Ruby file called .lotion.rb in which the following constants are defined:

  • FILES - All Ruby sources registered with Motion::Project::App.files
  • DEPENDENCIES - All file dependencies registered with Motion::Project::App.files_dependencies
  • IGNORED_REQUIRES - Ignored file requires (declared in Lotion.setup)
  • USER_MOCKS - The directory in which user defined mock gems are located
  • GEM_MOCKS - The directory in which LockOMotion mock gems are located
  • LOAD_PATHS - Available load paths after running rake
  • GEM_PATHS - Available gem paths (resembles Gem.latest_load_paths)
  • REQUIRED - All required files after running rake

At runtime, LockOMotion uses .lotion.rb for resolving Ruby sources. This makes it possible the print warnings as specific as possible which makes debugging a little easier.

Example

Let us say your Gemfile looks like the following:

source "http://rubygems.org"

# RubyMotion awared gems
gem "lock-o-motion"

# RubyMotion unawared gems
group :lotion do
  gem "mab"
end

A fragment of the generated .lotion.rb looks like this:

module Lotion
  FILES = [
    "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/lock-o-motion-0.1.1/lib/motion/core_ext.rb",
    "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/lock-o-motion-0.1.1/lib/motion/lotion.rb",
    "/Users/paulengel/Sources/just_awesome/.lotion.rb",
    "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/colorize-0.5.8/lib/colorize.rb",
    "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab.rb",
    "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab/builder.rb",
    "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab/indentation.rb",
    "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab/mixin.rb",
    "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab/version.rb",
    "/Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/cgi.rb",
    "/Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/cgi/cookie.rb",
    "/Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/cgi/core.rb",
    "/Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/cgi/util.rb",
    "./app/app_delegate.rb",
    "./app/controllers/awesome_controller.rb"
  ]
  DEPENDENCIES = {
    "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab.rb" => [
      "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/lock-o-motion-0.1.1/lib/motion/core_ext.rb",
      "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/lock-o-motion-0.1.1/lib/motion/lotion.rb",
      "/Users/paulengel/Sources/just_awesome/.lotion.rb",
      "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab/version.rb",
      "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab/mixin.rb",
      "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab/indentation.rb",
      "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab/builder.rb"
    ],
    "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab/mixin.rb" => [
      "/Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/cgi.rb"
    ],
    "/Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/cgi.rb" => [
      "/Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/cgi/core.rb",
      "/Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/cgi/cookie.rb",
      "/Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/cgi/util.rb"
    ],
    "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/lock-o-motion-0.1.1/lib/motion/core_ext.rb" => [
      "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/colorize-0.5.8/lib/colorize.rb"
    ],
    "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/lock-o-motion-0.1.1/lib/motion/lotion.rb" => [
      "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/colorize-0.5.8/lib/colorize.rb"
    ],
    "/Users/paulengel/Sources/just_awesome/.lotion.rb" => [
      "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/colorize-0.5.8/lib/colorize.rb"
    ]
  }
  IGNORED_REQUIRES = []
  USER_MOCKS = "/Users/paulengel/Sources/just_awesome/mocks"
  GEM_MOCKS = "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/lock-o-motion-0.1.1/lib/lock-o-motion/mocks"
  LOAD_PATHS = [
    "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib",
    "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/lock-o-motion-0.1.1/lib",
    "/Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/colorize-0.5.8/lib",
    "/Library/RubyMotion/lib",

Warnings at runtime

As said before, you are not able to require sources at runtime and you cannot do "dynamic code execution" using class_eval or instance_eval with string interpolation (passing blocks is possible though). LockOMotion warns you about these kind of statements.

Restricted method calls

Using the previous Gemfile, as Mab uses class_eval with string interpolation. The console output would look something like this:

1.9.3 paulengel:just_awesome $ rake
     Build ./build/iPhoneSimulator-6.1-Development
   Compile /Users/paulengel/Sources/just_awesome/.lotion.rb
      Link ./build/iPhoneSimulator-6.1-Development/Just Awesome.app/Just Awesome
    Create ./build/iPhoneSimulator-6.1-Development/Just Awesome.dSYM
  Simulate ./build/iPhoneSimulator-6.1-Development/Just Awesome.app
   Warning Called `Mab::Mixin::HTML5.class_eval` from
           /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab/mixin.rb:201
   Warning Called `Mab::Mixin::HTML5.class_eval` from
           /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab/mixin.rb:201
   Warning Called `Mab::Mixin::HTML5.class_eval` from
           /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab/mixin.rb:201
   Warning Called `Mab::Mixin::HTML5.class_eval` from
           /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab/mixin.rb:201
   Warning Called `Mab::Mixin::HTML5.class_eval` from
           /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab/mixin.rb:201
   Warning Called `Mab::Mixin::HTML5.class_eval` from
           /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/mab-0.0.2/lib/mab/mixin.rb:201
   Warning Called `Mab::Mixin::HTML5.class_eval` from

You will need to solve this yourself e.g. by overriding the method for instance or by refactoring.

Runtime requirements

It is possible that a Ruby source file gets required later on at runtime. Such file requirements are not allowed. This is the case when using MultiJSON. Using the following Gemfile:

source "http://rubygems.org"

# RubyMotion awared gems
gem "lock-o-motion"

# RubyMotion unawared gems
group :lotion do
  gem "multi_json"
end

You will get the following console output:

1.9.3 paulengel:just_awesome $ rake
     Build ./build/iPhoneSimulator-6.1-Development
   Compile /Users/paulengel/Sources/just_awesome/.lotion.rb
      Link ./build/iPhoneSimulator-6.1-Development/Just Awesome.app/Just Awesome
    Create ./build/iPhoneSimulator-6.1-Development/Just Awesome.dSYM
  Simulate ./build/iPhoneSimulator-6.1-Development/Just Awesome.app
2013-02-13 01:10:53.584 Just Awesome[57808:c07] lotion.rb:17:in `require:': cannot load such file -- oj (LoadError)
  from core_ext.rb:39:in `require:'
  from multi_json.rb:38:in `block in default_adapter'
  from multi_json.rb:36:in `default_adapter'
  from multi_json.rb:85:in `load_adapter:'
  from multi_json.rb:73:in `use:'
  from multi_json.rb:55:in `adapter'
  from multi_json.rb:114:in `current_adapter:'
  from multi_json.rb:100:in `load:'
   Warning Called `require "yajl"` from
           /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/multi_json-1.6.0/lib/multi_json.rb:38
           Add within Lotion.setup block: app.require "yajl"
   Warning Called `require "multi_json/adapters/yajl"` from
           /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/multi_json-1.6.0/lib/multi_json.rb:82
           Add within Lotion.setup block: app.require "multi_json/adapters/yajl"
2013-02-13 01:10:53.728 Just Awesome[57808:c07] multi_json.rb:83:in `load_adapter:': uninitialized constant MultiJson::Adapters (NameError)
  from multi_json.rb:85:in `load_adapter:'
  from multi_json.rb:73:in `use:'

When applicable, you will get a warning about it. Here is the fragment of the warning:

   Warning Called `require "yajl"` from
           /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/multi_json-1.6.0/lib/multi_json.rb:38
           Add within Lotion.setup block: app.require "yajl"
   Warning Called `require "multi_json/adapters/yajl"` from
           /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/multi_json-1.6.0/lib/multi_json.rb:82
           Add within Lotion.setup block: app.require "multi_json/adapters/yajl"

The following section contains further information about how to correct this.

Extending Lotion.setup

You can require additional Ruby sources using Lotion.setup. To correct the earlier require warnings, declare the setup as follows:

Lotion.setup do |app|
  app.require "yajl"
  app.require "multi_json/adapters/yajl"
end

Requirement of .bundle files

As far as I know, you are not able to require .bundle files within a RubyMotion application. After adding the require statement within Lotion.setup, you will get the following warning:

1.9.3 paulengel:just_awesome $ rake
   Warning /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/yajl-ruby-1.1.0/lib/yajl.rb
           requires /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/yajl-ruby-1.1.0/lib/yajl/yajl.bundle
     Build ./build/iPhoneSimulator-6.1-Development
   Compile /Users/paulengel/Sources/just_awesome/.lotion.rb
   Compile /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/multi_json-1.6.0/lib/multi_json/adapters/yajl.rb
   Compile /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/yajl-ruby-1.1.0/lib/yajl.rb
      Link ./build/iPhoneSimulator-6.1-Development/Just Awesome.app/Just Awesome
    Create ./build/iPhoneSimulator-6.1-Development/Just Awesome.app/Info.plist
    Create ./build/iPhoneSimulator-6.1-Development/Just Awesome.app/PkgInfo
    Create ./build/iPhoneSimulator-6.1-Development/Just Awesome.dSYM
  Simulate ./build/iPhoneSimulator-6.1-Development/Just Awesome.app
(main)> 2013-02-13 01:13:03.630 Just Awesome[57933:c07] uninitialized constant Yajl (NameError)

You can to try mocking Ruby gems with drop-in replacements.

Adding lotion.rb

LockOMotion provides a possibility to run Ruby code at startup. You can think of it as a Rails initializer. Just add a file called lotion.rb within the root directory of your RubyMotion application.

Let's say the root directory of your RubyMotion application is /Users/paulengel/Sources/just_awesome. Create a file at /Users/paulengel/Sources/just_awesome/lotion.rb.

When containing the following Ruby code:

puts "Hello, I am `lotion.rb`"
puts SlotMachine.class

Using the following Gemfile:

source "http://rubygems.org"

# RubyMotion awared gems
gem "lock-o-motion"

# RubyMotion unawared gems
group :lotion do
  gem "slot_machine"
end

The output will be as follows:

1.9.3 paulengel:just_awesome $ rake
     Build ./build/iPhoneSimulator-6.1-Development
   Compile /Users/paulengel/Sources/just_awesome/.lotion.rb
      Link ./build/iPhoneSimulator-6.1-Development/Just Awesome.app/Just Awesome
    Create ./build/iPhoneSimulator-6.1-Development/Just Awesome.dSYM
  Simulate ./build/iPhoneSimulator-6.1-Development/Just Awesome.app
Hello, I am `lotion.rb`
Module
(main)>

Mocking Ruby gems

LockOMotion is able to mock some of the HTTParty core methods (GET, POST, PUT, DELETE requests and HTTP Basic Authentication). With this achievement, we are able to use several Ruby gems which have HTTParty as gem dependency. The dependency will not be a blocking factor anymore when it comes to using the gem within a RubyMotion application.

As opposed to not having the HTTParty mock to our availability:

Gemfile

source "http://rubygems.org"

# RubyMotion aware gems
gem "lock-o-motion"

# RubyMotion unaware gems
group :lotion do
  gem "httparty"
end

Fragment of a defined UIViewController for instance

def viewDidLoad
  super
  puts HTTParty.get("https://github.com/archan937/lock-o-motion").parsed_response
end

Console output

1.9.3 paulengel:just_awesome $ rake
   Warning Could not resolve dependency "socket.so"
   Warning /Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/net/http.rb
           requires /Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/x86_64-darwin12.2.1/zlib.bundle
   Warning /Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/net/http.rb
           requires /Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/x86_64-darwin12.2.1/stringio.bundle
   Warning Skipped 'openssl' requirement
   Warning /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/httparty-0.10.1/lib/httparty.rb
           requires /Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/x86_64-darwin12.2.1/zlib.bundle
   Warning /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/multi_xml-0.5.3/lib/multi_xml.rb
           requires /Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/x86_64-darwin12.2.1/bigdecimal.bundle
   Warning /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/multi_xml-0.5.3/lib/multi_xml.rb
           requires /Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/x86_64-darwin12.2.1/stringio.bundle
   Warning /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/httparty-0.10.1/lib/httparty/net_digest_auth.rb
           requires /Users/paulengel/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/x86_64-darwin12.2.1/digest/md5.bundle
     Build ./build/iPhoneSimulator-6.1-Development
   Compile /Users/paulengel/Sources/just_awesome/.lotion.rb
      Link ./build/iPhoneSimulator-6.1-Development/Just Awesome.app/Just Awesome
    Create ./build/iPhoneSimulator-6.1-Development/Just Awesome.dSYM
  Simulate ./build/iPhoneSimulator-6.1-Development/Just Awesome.app
(main)> 2013-02-13 01:21:39.888 Just Awesome[59028:c07] lotion.rb:17:in `require:': cannot load such file -- pathname.so (LoadError)
  from core_ext.rb:39:in `require:'

When we do have the HTTParty mock to our availability, we can just leave the code as is and get a console output like this:

1.9.3 paulengel:just_awesome $ rake
     Build ./build/iPhoneSimulator-6.1-Development
   Compile /Users/paulengel/Sources/just_awesome/.lotion.rb
   Compile /Users/paulengel/.rvm/gems/ruby-1.9.3-p374/gems/lock-o-motion-0.1.1/lib/lock-o-motion/mocks/httparty.rb
   Compile ./app/controllers/awesome_controller.rb
      Link ./build/iPhoneSimulator-6.1-Development/Just Awesome.app/Just Awesome
    Create ./build/iPhoneSimulator-6.1-Development/Just Awesome.dSYM
  Simulate ./build/iPhoneSimulator-6.1-Development/Just Awesome.app
(main)>


<!DOCTYPE html>
<html>
  <head prefix="og: http://ogp.me/ns# fb: http://ogp.me/ns/fb# githubog: http://ogp.me/ns/fb/githubog#">
    <meta charset='utf-8'>
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title>archan937/lock-o-motion · GitHub</title>
    <link rel="search" type="application/opensearchdescription+xml" href="/opensearch.xml" title="GitHub" />
    <link rel="fluid-icon" href="https://github.com/fluidicon.png" title="GitHub" />
    <link rel="apple-touch-icon-precomposed" sizes="57x57" href="apple-touch-icon-114.png" />
    <link rel="apple-touch-icon-precomposed" sizes="114x114" href="apple-touch-icon-114.png" />
    <link rel="apple-touch-icon-precomposed" sizes="72x72" href="apple-touch-icon-144.png" />
    <link rel="apple-touch-icon-precomposed" sizes="144x144" href="apple-touch-icon-144.png" />
    <link rel="logo" type="image/svg" href="http://github-media-downloads.s3.amazonaws.com/github-logo.svg" />
    <meta name="msapplication-TileImage"
(main)>

I am planning on writing more "mocks" for common Ruby gems. But aside from mocks being defined within the LockOMotion gem sources, you can also define your own mocks within your RubyMotion application. Just add a directory called mocks within the root directory of the application and put the "mock sources" in it. The relative path of the mock source within that directory ensures a certain Ruby gem being mocked at compile time.

Let's say the root directory of your RubyMotion application is /Users/paulengel/Sources/just_awesome. If you want to mock require "httparty", create a file at /Users/paulengel/Sources/just_awesome/mocks/httparty.rb containing the mock code. If you want to mock require "net/http", create a file at /Users/paulengel/Sources/just_awesome/mocks/net/http.rb. Cool, huh?

As already mentioned within the introduction, I am very well aware of this not being a waterproof solution, but it helps us getting on track.

Skipped requirements

There are a few Ruby file sources that LockOMotion will refuse to require:

  • pry
  • openssl

At the moment, you will have to find a replacement yourself.

Closing words

With LockOMotion, I have tried to lower the threshold for using more Ruby gems within RubyMotion applications. Contributions are very much welcome. Please spread the word about LockOMotion when you like it! ^^

Contact me

For support, remarks and requests, please mail me at paul.engel@holder.nl.

License

Copyright (c) 2013 Paul Engel, released under the MIT license

http://holder.nl - http://codehero.es - http://gettopup.com - http://github.com/archan937 - http://twitter.com/archan937 - paul.engel@holder.nl

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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Package last updated on 13 Feb 2013

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