Add the ability to execute struct field functions

namespace.go

@@ -10,7 +10,7 @@ type Namespace struct {
 	tags  map[string]Tag
 
 	// WhitespaceMutations enables postprocessing to remove whitespace where it isn't needed
-	// to make the resulting document look better. Postprocessing is only done oncewhen the
+	// to make the resulting document look better. Postprocessing is only done once when the
 	// template is parsed, so it will not affect performance. (default: true)
 	WhitespaceMutations bool
 	escapeHTML          *bool

salix.go

@@ -438,11 +438,18 @@ func (t *Template) execMethodCall(mc ast.MethodCall, local map[string]any) (any,
 	for rval.Kind() == reflect.Pointer {
 		rval = rval.Elem()
 	}
+	// First, check for a method with the given name
 	mtd := rval.MethodByName(mc.Name.Value)
-	if !mtd.IsValid() {
-		return nil, ast.PosError(mc, "no such method: %s", mc.Name.Value)
+	if mtd.IsValid() {
+		return t.execFunc(mtd, mc, mc.Params, local)
 	}
-	return t.execFunc(mtd, mc, mc.Params, local)
+	// If the method doesn't exist, also check for a field storing a function.
+	field := rval.FieldByName(mc.Name.Value)
+	if field.IsValid() && field.Kind() == reflect.Func {
+		return t.execFunc(field, mc, mc.Params, local)
+	}
+	// If neither of those exist, return an error
+	return nil, ast.PosError(mc, "no such method: %s", mc.Name.Value)
 }
 
 // execFunc executes a function call