Add namespaces and include tag, improve whitespace handling

vars.go

@@ -0,0 +1,31 @@
+package salix
+
+import (
+	"reflect"
+	"strings"
+)
+
+var globalVars = map[string]reflect.Value{
+	"len":        reflect.ValueOf(tmplLen),
+	"toUpper":    reflect.ValueOf(strings.ToUpper),
+	"toLower":    reflect.ValueOf(strings.ToLower),
+	"hasPrefix":  reflect.ValueOf(strings.HasPrefix),
+	"trimPrefix": reflect.ValueOf(strings.TrimPrefix),
+	"hasSuffix":  reflect.ValueOf(strings.HasSuffix),
+	"trimSuffix": reflect.ValueOf(strings.TrimSuffix),
+	"trimSpace":  reflect.ValueOf(strings.TrimSpace),
+	"equalFold":  reflect.ValueOf(strings.EqualFold),
+	"count":      reflect.ValueOf(strings.Count),
+	"split":      reflect.ValueOf(strings.Split),
+	"join":       reflect.ValueOf(strings.Join),
+}
+
+func tmplLen(v any) int {
+	val := reflect.ValueOf(v)
+	switch val.Kind() {
+	case reflect.Array, reflect.Slice, reflect.String, reflect.Map:
+		return val.Len()
+	default:
+		return -1
+	}
+}