Add Mod operation

internal/glance/widget-custom-api.go

@@ -414,6 +414,14 @@ func customAPIDoMathOp[T int | float64](a, b T, op string) T {
 			return 0
 		}
 		return a / b
+	case "mod":
+		ai, bi := any(a), any(b)
+		aint, aok := ai.(int)
+		bint, bok := bi.(int)
+		if aok && bok && bint != 0 {
+			return T(aint % bint)
+		}
+		return 0
 	}
 	return 0
 }
@@ -479,6 +487,9 @@ var customAPITemplateFuncs = func() template.FuncMap {
 		"div": func(a, b any) any {
 			return doMathOpWithAny(a, b, "div")
 		},
+		"mod": func(a, b int) any {
+			return doMathOpWithAny(a, b, "mod")
+		},
 		"now": func() time.Time {
 			return time.Now()
 		},