Add parsing of ENV variable values to Boolean type

Fixes #178

Author: mjgiarlo

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### New features
+
+* Add parsing of ENV variable values to Boolean type
+
 ...
 
 ## 1.5.0
@@ -86,6 +90,3 @@
 
 * Expose Settings in application.rb, so you don't have to duplicate configuration for each environment file ([#59](https://github.com/railsjedi/config/issues/59))
 * Adding support for Rails 4.1.0.rc ([#70](https://github.com/railsjedi/config/issues/70))
-
-
-

README.md

@@ -344,13 +344,14 @@ You can customize how environment variables are processed:
 * `env_converter` (default: `:downcase`)  - how to process variables names:
   * `nil` - no change
   * `:downcase` - convert to lower case
-* `env_parse_values` (default: `true`) - try to parse values to a correct type (`Integer`, `Float`, `String`)
+* `env_parse_values` (default: `true`) - try to parse values to a correct type (`Boolean`, `Integer`, `Float`, `String`)
 
 For instance, given the following environment:
 
 ```bash
 SETTINGS__SECTION__SERVER_SIZE=1
 SETTINGS__SECTION__SERVER=google.com
+SETTINGS__SECTION__SSL_ENABLED=false
 ```
 
 And the following configuration:
@@ -370,6 +371,7 @@ The following settings will be available:
 ```ruby
 Settings.section.server_size # => 1
 Settings.section.server # => 'google.com'
+Settings.section.ssl_enabled # => false
 ```
 
 ## Contributing

lib/config/options.rb

@@ -188,7 +188,14 @@ def __convert(h) #:nodoc:
 
     # Try to convert string to a correct type
     def __value(v)
-      Integer(v) rescue Float(v) rescue v
+      case v
+      when 'false'
+        false
+      when 'true'
+        true
+      else
+        Integer(v) rescue Float(v) rescue v
+      end
     end
   end
 end

spec/config_env_spec.rb

@@ -48,6 +48,20 @@
     end
 
     context 'and parsing ENV variable names is enabled' do
+      it 'should recognize "false" and expose as Boolean' do
+        ENV['Settings.new_var'] = 'false'
+
+        expect(config.new_var).to eq(false)
+        expect(config.new_var.is_a? FalseClass).to eq(true)
+      end
+
+      it 'should recognize "true" and expose as Boolean' do
+        ENV['Settings.new_var'] = 'true'
+
+        expect(config.new_var).to eq(true)
+        expect(config.new_var.is_a? TrueClass).to eq(true)
+      end
+
       it 'should recognize numbers and expose them as integers' do
         ENV['Settings.new_var'] = '123'