Add url coercer

Author: chris

README.md

@@ -91,11 +91,12 @@ The following types are supported:
 * `:time` (e.g. '14:00')
 * `:hash` (e.g. 'a=1&b=2' becomes `{'a' => '1', 'b' => '2'}`)
 * `:array` (e.g. 'tag1,tag2' becomes `['tag1', 'tag2']`)
-* `:uri` (e.g. 'http://www.google.com' becomes `URI.parse('http://www.google.com')`
+* `:uri` (e.g. 'www.google.com' becomes `#<URI::Generic www.google.com>`
+* `:uri_with_scheme` (is like :uri, but will raise an exception `if uri.scheme.nil?`)
 
 ### Groups
 
-Groups give you more flexibility to define when variables are needed.  
+Groups give you more flexibility to define when variables are needed.
 It's similar to groups in a Gemfile:
 
 ```ruby
@@ -147,7 +148,7 @@ variable :FORCE_SSL, :boolean, default: 'false'
 variable :PORT, :integer, default: proc {|envied| envied.FORCE_SSL ? 443 : 80 }
 ```
 
-Please remember that ENVied only **reads** from ENV; it doesn't mutate ENV.  
+Please remember that ENVied only **reads** from ENV; it doesn't mutate ENV.
 Don't let setting a default for, say `RAILS_ENV`, give you the impression that `ENV['RAILS_ENV']` is set.
 As a rule of thumb you should only use defaults:
 * for local development

lib/envied/coercer.rb

@@ -26,7 +26,7 @@ def coerce_method_for(type)
 
   def self.supported_types
     @supported_types ||= begin
-      [:hash, :array, :time, :date, :symbol, :boolean, :integer, :string, :uri, :float].sort
+      [:hash, :array, :time, :date, :symbol, :boolean, :integer, :string, :uri, :uri_with_scheme, :float].sort
     end
   end
 

lib/envied/coercer/envied_string.rb

@@ -15,6 +15,11 @@ def to_uri(str)
     ::URI.parse(str)
   end
 
+  def to_uri_with_scheme(str)
+    result = to_uri(str)
+    result.scheme.nil? ? raise_unsupported_coercion(str, __method__) : result
+  end
+
   def to_integer(str)
     Integer(str)
   rescue ArgumentError

spec/coercer_spec.rb

@@ -114,8 +114,34 @@ def coerce_to(type)
     describe 'to uri' do
       let(:coerce){ coerce_to(:uri) }
 
-      it 'converts strings to uris' do
-        expect(coerce['http://www.google.com']).to be_a(URI)
+      it 'converts strings to generic uris' do
+        expect(coerce['3']).to be_a(URI::Generic)
+      end
+
+      it 'converts strings to ftp uris' do
+        expect(coerce['ftp://ftp.example.com']).to be_a(URI::FTP)
+      end
+    end
+
+    describe 'to uri_with_scheme' do
+      let(:coerce){ coerce_to(:uri_with_scheme) }
+
+      it 'converts strings to http uris' do
+        expect(coerce['http://www.google.com'].scheme).to eql 'http'
+      end
+
+      it 'converts strings to https uris' do
+        expect(coerce['https://github.com'].scheme).to eql 'https'
+      end
+
+      it 'converts strings to redis uris' do
+        expect(coerce['redis://example.com:6379'].scheme).to eql 'redis'
+      end
+
+      it 'fails for non urls' do
+        expect {
+          coerce['3']
+        }.to raise_error(Coercible::UnsupportedCoercion)
       end
     end
   end