Make TrimSpace available for use in the template (#3281)

* Make TrimSpace available for use in the template

Signed-off-by: Ghazanfar <ghazanfar.isc@gmail.com>

docs/notifications.md

@@ -89,6 +89,7 @@ templating.
 | title | string |[strings.Title](http://golang.org/pkg/strings/#Title), capitalises first character of each word. |
 | toUpper | string | [strings.ToUpper](http://golang.org/pkg/strings/#ToUpper), converts all characters to upper case. |
 | toLower | string | [strings.ToLower](http://golang.org/pkg/strings/#ToLower), converts all characters to lower case. |
+| trimSpace | string | [strings.TrimSpace](https://pkg.go.dev/strings#TrimSpace), removes leading and trailing white spaces. |
 | match | pattern, string | [Regexp.MatchString](https://golang.org/pkg/regexp/#MatchString). Match a string using Regexp. |
 | reReplaceAll | pattern, replacement, text | [Regexp.ReplaceAllString](http://golang.org/pkg/regexp/#Regexp.ReplaceAllString) Regexp substitution, unanchored. |
 | join | sep string, s []string | [strings.Join](http://golang.org/pkg/strings/#Join), concatenates the elements of s to create a single string. The separator string sep is placed between elements in the resulting string. (note: argument order inverted for easier pipelining in templates.) |

template/template.go

@@ -168,9 +168,11 @@ func (t *Template) ExecuteHTMLString(html string, data interface{}) (string, err
 type FuncMap map[string]interface{}
 
 var DefaultFuncs = FuncMap{
-	"toUpper": strings.ToUpper,
-	"toLower": strings.ToLower,
-	"title":   cases.Title(language.AmericanEnglish).String,
+	"toUpper":   strings.ToUpper,
+	"toLower":   strings.ToLower,
+	"trimSpace": strings.TrimSpace,
+
+	"title": cases.Title(language.AmericanEnglish).String,
 	// join is equal to strings.Join but inverts the argument order
 	// for easier pipelining in templates.
 	"join": func(sep string, s []string) string {

template/template_test.go

@@ -328,6 +328,11 @@ func TestTemplateExpansion(t *testing.T) {
 			in:    `{{ "abc" | title }}`,
 			exp:   "Abc",
 		},
+		{
+			title: "Template using TrimSpace",
+			in:    `{{ " a b c " | trimSpace }}`,
+			exp:   "a b c",
+		},
 		{
 			title: "Template using positive match",
 			in:    `{{ if match "^a" "abc"}}abc{{ end }}`,