Add Feature class and memory repository

README.md

@@ -18,7 +18,48 @@ Or install it yourself as:
 
 ## Usage
 
-TODO: Write usage instructions here
+### Repositories
+
+First, you need to configure where to store everything by setting a repository.
+
+Available repositories are :
+- `Flop::Repository::Memory`
+
+To set the repository, create a new object and affect it to `Flop.repo`.
+```ruby
+Flop.repo = Flop::Repository::Memory.new
+```
+
+### Features
+
+To access a feature, you can call the Flop[] method or create a new `Flop::Feature` object.
+```ruby
+Flop[:example_feature] # is the same as
+Flop::Feature.new(:example_feature)
+```
+
+Available methods on `Flop::Feature` are :
+- `feature.active?` returns true if the feature is active
+- `feature.inactive?` returns true if the feature is inactive
+- `feature.set(boolean)` sets the state of the feature to the passed value
+- `feature.activate` activates the feature
+- `feature.deactivate` deactivates the feature
+- `feature.toggle` toggles the state of the feature
+- `feature.with { }` executes the block if the feature is active
+- `feature.without { }` executes the block if the feature is inactive
+
+## Examples
+
+```ruby
+Flop.repo = Flop::Repository::Memory.new
+
+Flop[:feature].active? # => false
+Flop[:feature].toggle # => true
+
+Flop[:feature].with do
+  # code
+end
+```
 
 ## Contributing
 

lib/flop.rb

@@ -1,5 +1,14 @@
-require "flop/version"
+require 'flop/version'
+
+require 'flop/feature'
+require 'flop/repository/memory'
 
 module Flop
-  # Your code goes here...
+  class << self
+    attr_accessor :repo
+
+    def [](feature)
+      Flop::Feature.new(feature)
+    end
+  end
 end

lib/flop/feature.rb

@@ -0,0 +1,42 @@
+module Flop
+  class Feature
+    attr_accessor :name, :repo
+
+    def initialize(name, repo = Flop.repo)
+      self.name = name.to_sym
+      self.repo = repo
+    end
+
+    def active?
+      repo.get(name)
+    end
+
+    def inactive?
+      !active?
+    end
+
+    def set(value)
+      repo.set(name, value)
+    end
+
+    def activate
+      set true
+    end
+
+    def deactivate
+      set false
+    end
+
+    def toggle
+      set !active?
+    end
+
+    def with(&block)
+      yield block if active?
+    end
+
+    def without(&block)
+      yield block if inactive?
+    end
+  end
+end

lib/flop/repository/memory.rb

@@ -0,0 +1,19 @@
+module Flop
+  module Repository
+    class Memory
+      attr_accessor :features
+
+      def initialize
+        self.features = Hash.new(false)
+      end
+
+      def get(name)
+        features[name]
+      end
+
+      def set(name, value)
+        features[name] = value
+      end
+    end
+  end
+end