Add API for Variables (#29520)

close #27801

---------

Co-authored-by: silverwind <me@silverwind.io>

modules/util/util.go

@@ -221,3 +221,12 @@ func IfZero[T comparable](v, def T) T {
 	}
 	return v
 }
+
+func ReserveLineBreakForTextarea(input string) string {
+	// Since the content is from a form which is a textarea, the line endings are \r\n.
+	// It's a standard behavior of HTML.
+	// But we want to store them as \n like what GitHub does.
+	// And users are unlikely to really need to keep the \r.
+	// Other than this, we should respect the original content, even leading or trailing spaces.
+	return strings.ReplaceAll(input, "\r\n", "\n")
+}