Initial commit

.gitignore

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+/.bundle/
+/.yardoc
+/Gemfile.lock
+/_yardoc/
+/coverage/
+/doc/
+/pkg/
+/spec/reports/
+/tmp/

.rspec

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+--color
+--require spec_helper

.travis.yml

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+sudo: false
+language: ruby
+rvm:
+  - 2.3.1
+before_install: gem install bundler -v 1.12.5

CODE_OF_CONDUCT.md

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+# Contributor Code of Conduct
+
+As contributors and maintainers of this project, and in the interest of
+fostering an open and welcoming community, we pledge to respect all people who
+contribute through reporting issues, posting feature requests, updating
+documentation, submitting pull requests or patches, and other activities.
+
+We are committed to making participation in this project a harassment-free
+experience for everyone, regardless of level of experience, gender, gender
+identity and expression, sexual orientation, disability, personal appearance,
+body size, race, ethnicity, age, religion, or nationality.
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery
+* Personal attacks
+* Trolling or insulting/derogatory comments
+* Public or private harassment
+* Publishing other's private information, such as physical or electronic
+  addresses, without explicit permission
+* Other unethical or unprofessional conduct
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+By adopting this Code of Conduct, project maintainers commit themselves to
+fairly and consistently applying these principles to every aspect of managing
+this project. Project maintainers who do not follow or enforce the Code of
+Conduct may be permanently removed from the project team.
+
+This code of conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community.
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting a project maintainer at [email protected]. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. Maintainers are
+obligated to maintain confidentiality with regard to the reporter of an
+incident.
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 1.3.0, available at
+[http://contributor-covenant.org/version/1/3/0/][version]
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/3/0/

Gemfile

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+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in setting_macro.gemspec
+gemspec

README.md

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+# SettingMacro
+
+Defines a `setting` class method which can be used to retrieve and set some
+class-level veriables. Heavily inspired by the [ClassMacros in the rom-support
+respository](https://github.com/rom-rb/rom-support/blob/31085bb9a02a68455f2a66dce1fa08fcfd937430/lib/rom/support/class_macros.rb).
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+```ruby
+gem 'setting_macro'
+```
+
+## Usage
+
+```
+class Heating
+  extend SettingMacro
+  setting :default_temperature
+  setting :heat_source, default: 'unknown'
+end
+
+class Oven < Heating
+  default_temperature 200
+end
+
+class Sun < Heating
+  default_temperature 5505
+  heat_source 'nuclear_fusion'
+end
+
+p Heating.default_temperature # => nil
+p Heating.heat_source # => 'unknown'
+
+p Oven.default_temperature # => 200
+p Oven.heat_source # => 'unknown'
+
+p Sun.default_temperature # => 5505
+p Sun.heat_source # => 'nuclear_fusion'
+```
+
+
+## Contributing
+
+Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/setting_macro. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.
+

Rakefile

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+require "bundler/gem_tasks"
+begin
+  require 'rspec/core/rake_task'
+  RSpec::Core::RakeTask.new(:spec)
+  task :default => :spec
+rescue LoadError
+end

bin/console

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+#!/usr/bin/env ruby
+
+require "bundler/setup"
+require "setting_macro"
+
+# You can add fixtures and/or initialization code here to make experimenting
+# with your gem easier. You can also use a different console, if you like.
+
+# (If you use this, don't forget to add pry to your Gemfile!)
+# require "pry"
+# Pry.start
+
+require "irb"
+IRB.start

bin/setup

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+#!/usr/bin/env bash
+set -euo pipefail
+IFS=$'\n\t'
+set -vx
+
+bundle install
+
+# Do any other automated setup that you need to do here

lib/setting_macro.rb

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+require "setting_macro/version"
+
+module SettingMacro
+  Undefined = Object.new.freeze
+
+  def setting(name, default: nil)
+    mod = Module.new
+    mod.module_eval <<-RUBY, __FILE__, __LINE__ + 1
+      def #{name}(value = ::SettingMacro::Undefined)
+        if value == ::SettingMacro::Undefined
+          defined?(@#{name}) && @#{name}
+        else
+          @#{name} = value
+        end
+      end
+    RUBY
+
+    mod.send(:define_method, :inherited) do |klass|
+      super(klass)
+
+      # Make sure we inherit properly
+      klass.public_send(name, send(name))
+    end
+
+    mod.send(:define_singleton_method, :extended) do |base|
+      # Set the default value
+      base.public_send(name, default)
+    end
+
+    extend(mod)
+  end
+end

lib/setting_macro/version.rb

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+module SettingMacro
+  VERSION = "0.1.0"
+end

setting_macro.gemspec

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+# coding: utf-8
+lib = File.expand_path('../lib', __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+require 'setting_macro/version'
+
+Gem::Specification.new do |spec|
+  spec.name          = "setting_macro"
+  spec.version       = SettingMacro::VERSION
+  spec.authors       = ["Maarten Claes"]
+  spec.email         = ["[email protected]"]
+
+  spec.summary       = %q{A module which provides a method to easily define class settings}
+  spec.description   = %q{A module which provides a method to easily define class settings}
+  spec.homepage      = "https://github.com/mcls/setting_macro"
+
+  # Prevent pushing this gem to RubyGems.org. To allow pushes either set the 'allowed_push_host'
+  # to allow pushing to a single host or delete this section to allow pushing to any host.
+  if spec.respond_to?(:metadata)
+    spec.metadata['allowed_push_host'] = "https://rubygems.org"
+  else
+    raise "RubyGems 2.0 or newer is required to protect against public gem pushes."
+  end
+
+  spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+  spec.bindir        = "exe"
+  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
+  spec.require_paths = ["lib"]
+
+  spec.add_development_dependency "bundler", "~> 1.12"
+  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rspec", ">= 3.4"
+end

spec/examples.txt

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+example_id                      | status | run_time        |
+------------------------------- | ------ | --------------- |
+./spec/integration_spec.rb[1:1] | passed | 0.00061 seconds |

spec/integration_spec.rb

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+RSpec.describe SettingMacro do
+  class Heating
+    extend SettingMacro
+    setting :default_temperature
+    setting :heat_source, default: 'unknown'
+  end
+
+  class Oven < Heating
+    default_temperature 200
+  end
+
+  class Sun < Heating
+    default_temperature 5505
+    heat_source 'nuclear_fusion'
+  end
+
+  it "works as expected" do
+    expect(Heating.default_temperature).to eq(nil)
+    expect(Oven.default_temperature).to eq(200)
+    expect(Sun.default_temperature).to eq(5505)
+
+    expect(Heating.heat_source).to eq('unknown')
+    expect(Oven.heat_source).to eq('unknown')
+    expect(Sun.heat_source).to eq('nuclear_fusion')
+  end
+end

spec/spec_helper.rb

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+require 'setting_macro'
+
+# See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
+RSpec.configure do |config|
+  config.expect_with :rspec do |expectations|
+    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
+  end
+
+  # rspec-mocks config goes here. You can use an alternate test double
+  # library (such as bogus or mocha) by changing the `mock_with` option here.
+  config.mock_with :rspec do |mocks|
+    # Prevents you from mocking or stubbing a method that does not exist on
+    # a real object. This is generally recommended, and will default to
+    # `true` in RSpec 4.
+    mocks.verify_partial_doubles = true
+  end
+
+  # These two settings work together to allow you to limit a spec run
+  # to individual examples or groups you care about by tagging them with
+  # `:focus` metadata. When nothing is tagged with `:focus`, all examples
+  # get run.
+  config.filter_run :focus
+  config.run_all_when_everything_filtered = true
+
+  # Allows RSpec to persist some state between runs in order to support
+  # the `--only-failures` and `--next-failure` CLI options. We recommend
+  # you configure your source control system to ignore this file.
+  config.example_status_persistence_file_path = "spec/examples.txt"
+
+  # Limits the available syntax to the non-monkey patched syntax that is
+  # recommended. For more details, see:
+  #   - http://rspec.info/blog/2012/06/rspecs-new-expectation-syntax/
+  #   - http://www.teaisaweso.me/blog/2013/05/27/rspecs-new-message-expectation-syntax/
+  #   - http://rspec.info/blog/2014/05/notable-changes-in-rspec-3/#zero-monkey-patching-mode
+  config.disable_monkey_patching!
+
+  # This setting enables warnings. It's recommended, but in some cases may
+  # be too noisy due to issues in dependencies.
+  config.warnings = true
+
+  # Many RSpec users commonly either run the entire suite or an individual
+  # file, and it's useful to allow more verbose output when running an
+  # individual spec file.
+  if config.files_to_run.one?
+    # Use the documentation formatter for detailed output,
+    # unless a formatter has already been configured
+    # (e.g. via a command-line flag).
+    config.default_formatter = 'doc'
+  end
+
+  # Print the 10 slowest examples and example groups at the
+  # end of the spec run, to help surface which specs are running
+  # particularly slow.
+  config.profile_examples = 10
+
+  # Run specs in random order to surface order dependencies. If you find an
+  # order dependency and want to debug it, you can fix the order by providing
+  # the seed, which is printed after each run.
+  #     --seed 1234
+  config.order = :random
+
+  # Seed global randomization in this process using the `--seed` CLI option.
+  # Setting this allows you to use `--seed` to deterministically reproduce
+  # test failures related to randomization by passing the same `--seed` value
+  # as the one that triggered the failure.
+  Kernel.srand config.seed
+end