From e40134f6e50ef9f81fac84e3c57a04a9b2e70a93 Mon Sep 17 00:00:00 2001
From: Bruno Almeida <bruno.almeida@nokia.com>
Date: Mon, 11 Mar 2024 09:32:49 +0000
Subject: [PATCH] Create omitted function

---
 pkg/engine/funcs.go      | 8 ++++++++
 pkg/engine/funcs_test.go | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/pkg/engine/funcs.go b/pkg/engine/funcs.go
index 431f82f63..234566d74 100644
--- a/pkg/engine/funcs.go
+++ b/pkg/engine/funcs.go
@@ -68,6 +68,8 @@ func funcMap() template.FuncMap {
 		"fromJson":      fromJSON,
 		"fromJsonArray": fromJSONArray,
 
+		"omitted": omitted,
+
 		// Duration helpers
 		"mustToDuration":       mustToDuration,
 		"durationSeconds":      durationSeconds,
@@ -269,6 +271,12 @@ func fromJSONArray(str string) []any {
 	return a
 }
 
+func omitted(a, b interface{}) interface{} {
+	if b == nil {
+		return a
+	}
+	return b
+
 // -----------------------------------------------------------------------------
 // Duration helpers (numeric and time.Duration returns)
 // -----------------------------------------------------------------------------
diff --git a/pkg/engine/funcs_test.go b/pkg/engine/funcs_test.go
index cf6a8d5c9..a17fc7e34 100644
--- a/pkg/engine/funcs_test.go
+++ b/pkg/engine/funcs_test.go
@@ -125,6 +125,14 @@ keyInElement1 = "valueInElement1"`,
 		tpl:    `{{ fromYamlArray . }}`,
 		expect: `[error unmarshaling JSON: while decoding JSON: json: cannot unmarshal object into Go value of type []interface {}]`,
 		vars:   `hello: world`,
+	}, {
+		tpl:    `{{ .hello | omitted 'yes' }}`,
+		expect: `false`,
+		vars:   map[string]bool{"hello": false},
+	}, {
+		tpl:    `{{ .value | omitted 'yes' }}`,
+		expect: `yes`,
+		vars:   map[string]bool{"hello": false},
 	}, {
 		// This should never result in a network lookup. Regression for #7955
 		tpl:    `{{ lookup "v1" "Namespace" "" "unlikelynamespace99999999" }}`,