cron-builder-ts
v1.0.5
Published
simple API for building cron expressions
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2,405
Readme
Forked from https://github.com/sourceclear/cron-builder
cron-builder
The software utility cron is a time-based scheduler in Unix-like computer operating systems. A user may use cron to schedule jobs (commands or scripts) to run periodically at fixed times, dates, or intervals. A cron statement is composed of 5 fields separated by white space. The *
character translates to "every", ie: "every minute" or "every day of the week".
cron-builder will manage the state of a cron expression, allowing a user to manipulate it through a simple API. It is decoupled from the DOM and doesn't have an opinion about where it's being called from. cron-builder considers this article its source of truth.
Install
cron-builder is available on npm and bower:
npm i cron-builder-ts --save
After installing, just require the package as you normally would:
import { CronBuilder } from 'cron-builder-ts';
API
To instantiate the cron builder:
// (default expression is set to "* * * * *")
var cronExp = new CronBuilder();
// optionally, pass in a cron expression to override the default:
var myCronExp = new CronBuilder('5 12 * * 1-5')
To return the cron expression at any given time:
cronExp.build();
// '* * * * *'
// add optional flags to customize build result
cronExp.build(options);
API includes basic getters and setters:
cronExp.get('minute');
// '*'
cronExp.set('minute', '5,35');
// '5,35'
cronExp.get('minute');
// '5,35'
cronExp.build();
// '5,35 * * * *'
Or if you'd prefer to add or remove values one at a time, use addValue
and removeValue
. These methods build or take away from what is currently set:
cronExp.addValue('hour', '2');
cronExp.addValue('monthOfTheYear', '4');
cronExp.addValue('monthOfTheYear', '10');
cronExp.build();
// '5,35 2 * 4,10 *'
cronExp.removeValue('minute', '5');
cronExp.build();
// '35 2 * 4,10 *'
If you prefer to work with the expression object directly, use getAll
and setAll
:
var exp = cronExp.getAll();
// {minute: ['35'], hour: ['2'], dayOfTheMonth: ['*'], monthOfTheYear: ['4','10'], ...}
exp.dayOfTheMonth = ['7','14','21','28'];
cronExp.setAll(exp);
cronExp.build();
// '35 2 7,14,21,28 4,10 *'
Build options
outputWeekdayNames and outputMonthNames
Default: false
const myCronExp = new CronBuilder('*/5 9-17/2 * 1-3 1-5')
cronExp.build({ outputWeekdayNames: true, outputMonthNames: true });
// Result: '*/5 *(10-16)/2 * JAN-MAR MON-FRI'
outputHashes
Default: false
const myCronExp = new CronBuilder('*/5 9-17/2 * 1-3 1-5')
cronExp.build({ outputHashes: true });
// Result: 'H/5 H(10-16)/2 H 1-3 1-5'
Notes:
- cron-builder does not currently support using
/
syntax to indicate values that are repeated. Instead of using*/15
, use the verbose form0,15,30,45
. - cron-builder requires using numeric representations of days of the week and months of the year. So instead of using
Feb,Mar,Apr
just use2,3,4
.
Contribute
Easy!
npm install
npm test
Pull requests and issues appreciated!
TODO
- more validation for things like adding values that are already included in a range, better range validations...
- sorting of values for a given measure of time
License
The MIT License (MIT)