structure changes

tools/variables/variables.go

@@ -0,0 +1,37 @@
+package variables
+
+import (
+	"errors"
+	"log"
+	"reflect"
+)
+
+// Defined checks if variable is defined in a struct
+func Defined(data interface{}, field string) bool {
+	t := reflect.Indirect(reflect.ValueOf(data)).Type()
+
+	if t.Kind() != reflect.Struct {
+		log.Print("Non-struct type not allowed.")
+		return false
+	}
+
+	_, b := t.FieldByName(field)
+	return b
+}
+
+// Dict allows to send more than one variable into a template
+func Dict(values ...interface{}) (map[string]interface{}, error) {
+	if len(values)%2 != 0 {
+		return nil, errors.New("invalid dict call")
+	}
+	dict := make(map[string]interface{}, len(values)/2)
+	for i := 0; i < len(values); i += 2 {
+		key, ok := values[i].(string)
+		if !ok {
+			return nil, errors.New("dict keys must be strings")
+		}
+		dict[key] = values[i+1]
+	}
+
+	return dict, nil
+}