fix: Custom implement ternary + default (#177)

* Custom implement ternary + default

Looks like the monkeypatching has some weird golang bug so just directly implement these

* fix lint

pkg/manifests/template/raw.go

@@ -42,15 +42,8 @@ func init() {
 	liquidEngine.RegisterFilter("nindent", nindent)
 	liquidEngine.RegisterFilter("replace", strings.ReplaceAll)
 
-	liquidEngine.RegisterFilter("default", func(a, b interface{}) interface{} {
-		fun := fncs["default"].(func(interface{}, interface{}) interface{})
-		return fun(b, a)
-	})
-
-	liquidEngine.RegisterFilter("ternary", func(a, b, c interface{}) interface{} {
-		fun := fncs["ternary"].(func(interface{}, interface{}, interface{}) interface{})
-		return fun(c, a, b)
-	})
+	liquidEngine.RegisterFilter("default", dfault)
+	liquidEngine.RegisterFilter("ternary", ternary)
 }
 
 type raw struct {

pkg/manifests/template/utils.go

@@ -1,6 +1,7 @@
 package template
 
 import (
+	"reflect"
 	"strings"
 
 	console "github.com/pluralsh/console-client-go"
@@ -31,3 +32,46 @@ func indent(v string, spaces int) string {
 func nindent(v string, spaces int) string {
 	return "\n" + indent(v, spaces)
 }
+
+func ternary(v bool, vt interface{}, vf interface{}) interface{} {
+	if v {
+		return vt
+	}
+
+	return vf
+}
+
+func dfault(v1, v2 interface{}) interface{} {
+	if empty(v1) {
+		return v2
+	}
+
+	return v1
+}
+
+func empty(given interface{}) bool {
+	g := reflect.ValueOf(given)
+	if !g.IsValid() {
+		return true
+	}
+
+	// Basically adapted from text/template.isTrue
+	switch g.Kind() {
+	default:
+		return g.IsNil()
+	case reflect.Array, reflect.Slice, reflect.Map, reflect.String:
+		return g.Len() == 0
+	case reflect.Bool:
+		return !g.Bool()
+	case reflect.Complex64, reflect.Complex128:
+		return g.Complex() == 0
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return g.Int() == 0
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+		return g.Uint() == 0
+	case reflect.Float32, reflect.Float64:
+		return g.Float() == 0
+	case reflect.Struct:
+		return false
+	}
+}