Adding the 'append' builtin function because Bourbon needs it. Currently…

Adding the 'append' builtin function because Bourbon needs it. Currently implemented in terms of 'join'; will need to rewrite.

context.cpp

@@ -114,6 +114,8 @@ namespace Sass {
     register_function(nth_descriptor, nth);
     register_function(join_2_descriptor, join_2);
     register_function(join_3_descriptor, join_3);
+    register_function(append_2_descriptor, join_2);
+    register_function(append_3_descriptor, join_3);
     // Introspection Functions
     register_function(type_of_descriptor, type_of);
     register_function(unit_descriptor, unit);

functions.cpp

@@ -479,7 +479,7 @@ namespace Sass {
         else if (sep == "space") rtype = Node::space_list;
         else if (sep == "auto")  rtype = l1.type();
         else {
-          throw_eval_error("third argument to join must be 'space', 'comma', or 'auto'", l2.path(), l2.line());
+          throw_eval_error("third argument to append/join must be 'space', 'comma', or 'auto'", l2.path(), l2.line());
         }
       }
       else if (l1.type() != Node::nil) rtype = l1.type();
@@ -502,6 +502,15 @@ namespace Sass {
     Node join_3(const vector<Token>& parameters, map<Token, Node>& bindings, Node_Factory& new_Node) {
       return join_impl(parameters, bindings, true, new_Node);
     }
+
+    // Node append_impl(const vector<Token>& parameters, map<Token, Node>& bindings, bool has_sep, Node_Factory& new_Node) {
+    // }
+
+    Function_Descriptor append_2_descriptor =
+    { "append", "$list", "$val", 0 };
+
+    Function_Descriptor append_3_descriptor =
+    { "append", "$list", "$val", "$separator", 0 };
     
     // Introspection Functions /////////////////////////////////////////////
     

functions.hpp

@@ -145,6 +145,9 @@ namespace Sass {
     
     extern Function_Descriptor join_3_descriptor;    
     Node join_3(const vector<Token>& parameters, map<Token, Node>& bindings, Node_Factory& new_Node);
+
+    extern Function_Descriptor append_2_descriptor;
+    extern Function_Descriptor append_3_descriptor;
     
     // Introspection Functions /////////////////////////////////////////////