feat: one-time tasks

resources/ts/lib/cron.ts

@@ -1,6 +1,8 @@
 import { CronType } from "@/enums";
 import { CronExpressionParser } from "cron-parser";
 
+const ONE_TIME_VALUE = "@one-time";
+
 export function parseCron(cron: string | null): {
     type: CronType;
     value: number;
@@ -11,6 +13,11 @@ export function parseCron(cron: string | null): {
             type: CronType.MANUAL,
             value: 0,
         };
+    } else if (cron === ONE_TIME_VALUE) {
+        return {
+            type: CronType.ONE_TIME,
+            value: 0,
+        };
     } else if ((value = /^0 (\d+) \* \* \*$/i.exec(cron)) !== null) {
         return {
             type: CronType.EVERY_DAY,
@@ -45,6 +52,8 @@ export function getCron(
     fallback: string,
 ): string | null {
     switch (type) {
+        case CronType.ONE_TIME:
+            return ONE_TIME_VALUE;
         case CronType.EVERY_DAY:
             return `0 ${value.toFixed(0)} * * *`;
         case CronType.EVERY_WEEK:
@@ -62,6 +71,10 @@ export function getCron(
     return null;
 }
 
+export function isOneTime(cron: string | null): boolean {
+    return cron === ONE_TIME_VALUE;
+}
+
 export function validCron(cron: string): boolean {
     try {
         CronExpressionParser.parse(cron);