Add Yaml repository

README.md

@@ -26,6 +26,7 @@ First, you need to configure where to store everything by setting a repository.
 Available repositories are :
 - `Flop::Repository::Memory`
 - `Flop::Repository::Redis`
+- `Flop::Repository::Yaml`
 
 To set the repository, create a new object and affect it to `Flop.repo`.
 ```ruby
@@ -49,6 +50,15 @@ Flop::Repository::Redis.new(Redis.new, [:flop, :namespace])
 Flop::Repository::Redis.new(Redis.new, -> { ENV['NAMESPACE'] })
 ```
 
+### YAML
+
+The `Yaml` repository requires a yaml file as its first parameter.
+This repository is read-only so methods like `activate`, `toggle`, ... can not be used.
+
+```ruby
+Flop::Repository::Yaml.new('my_file.yml')
+```
+
 ## Features
 
 To access a feature, you can call the Flop[] method or create a new `Flop::Feature` object.

lib/flop.rb

@@ -5,6 +5,7 @@ require 'flop/feature'
 require 'flop/repository'
 require 'flop/repository/memory'
 require 'flop/repository/redis'
+require 'flop/repository/yaml'
 
 module Flop
   class << self

lib/flop/repository/yaml.rb

@@ -0,0 +1,20 @@
+require 'yaml'
+
+module Flop
+  class Repository
+    class Yaml < Flop::Repository
+      attr_reader :yaml, :namespace
+
+      def initialize(yaml_file, namespace = 'flop')
+        @yaml = YAML.load_file(yaml_file)
+        @namespace = namespace
+      end
+
+      def get(name)
+        name = name.to_s
+        yaml[namespace].key?(name) ? yaml[namespace][name] : false
+      end
+    end
+  end
+end
+

test/fixtures/features.yml

@@ -0,0 +1,6 @@
+---
+flop:
+  blog: true
+  wiki: false
+custom_namespace:
+  chat: true

test/flop/repository/yaml_test.rb

@@ -0,0 +1,22 @@
+require 'test_helper'
+
+class Flop::Repository::YamlTest < Minitest::Test
+  def setup
+    @repo = Flop::Repository::Yaml.new('test/fixtures/features.yml')
+  end
+
+  def test_set_raises_exception
+    assert_raises(Flop::Repository::SetNotImplemented) do
+      @repo.set(:test, true)
+    end
+  end
+
+  def test_default_value_is_false
+    refute @repo.get(:unknown_key), 'default value is not false'
+  end
+
+  def test_get_value_with_default_namespace
+    assert_equal true, @repo.get(:blog)
+    assert_equal false, @repo.get(:wiki)
+  end
+end