ERB support in configuration files

lib/danthes.rb

@@ -35,7 +35,7 @@ def startup
 
     # Loads the configuration from a given YAML file
     def load_config(filename)
-      yaml = ::YAML.load_file(filename)[env]
+      yaml = ::YAML.load(ERB.new(File.read(filename)).result)[env]
       raise ArgumentError, "The #{environment} environment does not exist in #{filename}" if yaml.nil?
       (yaml.keys - ACCEPTED_KEYS).each {|k| yaml.delete(k)}
       yaml.each {|k, v| config[k.to_sym] = v}

spec/danthes_spec.rb

@@ -30,6 +30,13 @@
     config[:adapter].should eq('thin')
   end
 
+  it "loads configuration file with erb via load_config" do
+    ENV['DANTHES_SERVER'] = "http://example.com"
+    Danthes.env = 'production'
+    Danthes.load_config("spec/fixtures/danthes_with_erb.yml")
+    config[:server].should eq("http://example.com")
+  end
+
   context "when redis config exists" do
     before do
       Danthes.env = 'test'

spec/fixtures/danthes_with_erb.yml

@@ -0,0 +1,10 @@
+development:
+  adapter: thin
+  server: http://dev.local:9292/faye
+  secret_token: DEVELOPMENT_SECRET_TOKEN
+  signature_expiration: 600
+production:
+  adapter: thin
+  server: <%= ENV['DANTHES_SERVER'] %>
+  secret_token: PRODUCTION_SECRET_TOKEN
+  signature_expiration: 600