TW-1627: 'mon' is replaced with date in project field

- Thanks to James Cline.

AUTHORS

@@ -264,3 +264,4 @@ suggestions:
   Florian Petry
   Lars Beckers
   Dustin J. Mitchell
+  James Cline

ChangeLog

@@ -71,6 +71,7 @@
 - TW-1622 Duration UDA can't take an algebraic expression (thanks to Jeremy John
           Reeder).
 - TW-1626 Wrong wait date (thanks to Andrea Rizzi).
+- TW-1627 'mon' is replaced with date in project field (thanks to James Cline).
 - TW-1632 Japanese translation for Taskwarrior(150713) (thanks to ribbon).
 - TW-1634 due.not:<date> excludes only tasks scheduled at mitnight (thanks to
           Tomas Babej).

src/Task.cpp

@@ -2135,39 +2135,21 @@ void Task::modify (modType type, bool text_required /* = false */)
             ++modCount;
           }
 
-          // String type columns may eval, or may not make sense to eval, and
+          // String type columns are not eval'd.
-          // the best way to determine this is to try.
           else if (column->type () == "string")
           {
-            std::string evaluated = value;
+            if (column->validate (value))
-            try
-            {
-              Eval e;
-              e.addSource (domSource);
-              e.addSource (namedDates);
-              contextTask = *this;
-
-              Variant v;
-              e.evaluateInfixExpression (value, v);
-              v.cast (Variant::type_string);
-              evaluated = v.get_string ();
-            }
-
-            catch (...) { /* NOP */ }
-
-            // Final default action
-            if (column->validate (evaluated))
             {
               if (column->can_modify ())
               {
-                std::string col_value = column->modify (evaluated);
+                std::string col_value = column->modify (value);
-                context.debug (label + name + " <-- '" + col_value + "' <-- '" + evaluated + "' <-- '" + value + "'");
+                context.debug (label + name + " <-- '" + col_value + "' <-- '" + value + "'");
                 (*this).set (name, col_value);
               }
               else
               {
-                context.debug (label + name + " <-- '" + evaluated + "' <-- '" + value + "'");
+                context.debug (label + name + " <-- '" + value + "'");
-                (*this).set (name, evaluated);
+                (*this).set (name, value);
               }
 
               ++modCount;