Express crontabs as human friendly phrases

Last update: Dec 30, 2022

Related tags

Web Applications cronlingo

Overview

CRON Lingo

CronLingo turns human readable strings about time and turns them into valid crontabs.

Examples:

echo CronLingo::fromExpression('Every day at midnight');
// "0 0 * * *"

echo CronLingo::fromExpression('Every 15 minutes at midnight on the weekend');
// "*/15 0 * * 0,6"

echo CronLingo::fromExpression('Every other minute in August at noon on a weekday');
// "*/2 12 * 8 1,2,3,4,5"

echo CronLingo::fromExpression('The 1st day in April at midnight');
// "0 0 1 4 *"

echo CronLingo::fromExpression('Every day on the weekday at 2:25pm');
// "25 14 * * 1,2,3,4,5"

Syntax

CronLingo identifies the parts of a string with specific time-related keywords such as "on, to, at" and uses this to deduce the time meaning and convert it into part of a cron tab. It's not particular about the order of these statements. Here's a brief list of things that it will pick up and parse into a crontab:

Periods (daily, weekly, monthly)
Exact times (9:30 PM, 8a, 3p)
Meridiems (AM/PM/A/P)
Intervals (1st, second, other, ninth, etc)
Specific fields (second, minute, hour, day, month)
Day of week (sunday, monday, etc)
12 o'clocks (noon, midnight)
Lists (e.g., 5 to 12 minutes)
Month names (january, february, etc)
Weekend / weekday

What's a cron tab?

A cron tab is an expression that defines a recurring period of time.

It looks something like this:

*    *    *    *    *
-    -    -    -    -
|    |    |    |    |
|    |    |    |    +----- day of week (0 - 7) (Sunday=0 or 7)
|    |    |    +---------- month (1 - 12)
|    |    +--------------- day of month (1 - 31)
|    +-------------------- hour (0 - 23)
+------------------------- min (0 - 59)

From Wikipedia:

The software utility Cron is a time-based job scheduler in Unix-like computer operating systems. People who set up and maintain software environments use cron to schedule jobs (commands or shell scripts) to run periodically at fixed times, dates, or intervals. It typically automates system maintenance or administration—though its general-purpose nature makes it useful for things like connecting to the Internet and downloading email at regular intervals.

Comments

README does not match implementation

The README shows CronLingo::fromExpression("string") as the parser method, looks like the actual code has a CronLingo::cron("string") method.

I'll submit a couple of patches, can't quite tell which method name you prefer. fromExpression seems pretty reasonable though, conveys the true intention of the method. cron is a little vague. Could also be parse or whatever.

PS - I like it! :)

opened by codenamegary 2
Scrutinizer Auto-Fixes

@ajbdev requested this pull request.

It consists of patches automatically generated for this project on Scrutinizer: https://scrutinizer-ci.com/g/ajbdev/cronlingo/

opened by scrutinizer-auto-fixer 0
Scrutinizer Auto-Fixes

@ajbdev requested this pull request.

It consists of patches automatically generated for this project on Scrutinizer: https://scrutinizer-ci.com/g/ajbdev/cronlingo/

opened by scrutinizer-auto-fixer 0
Scrutinizer Auto-Fixes

@ajbdev requested this pull request.

It consists of patches automatically generated for this project on Scrutinizer: https://scrutinizer-ci.com/g/ajbdev/cronlingo/

opened by scrutinizer-auto-fixer 0

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Express crontabs as human friendly phrases

Related tags

Overview

CRON Lingo

Syntax

What's a cron tab?

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Comments

README does not match implementation

Scrutinizer Auto-Fixes

Scrutinizer Auto-Fixes

Scrutinizer Auto-Fixes

Releases(v0.1.1)

v0.1.1(Dec 11, 2015)

v0.1.0(Dec 11, 2015)

Owner

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