adamchainz / cron-descriptor

A Python library that converts cron expressions into human readable strings.

Cron Descriptor

Master: All:

A Python library that converts cron expressions into human readable strings. Ported to Python from https://github.com/bradyholt/cron-expression-descriptor.

Author: Adam Schubert (https://www.salamek.cz)
Original Author & Credit: Brady Holt (http://www.geekytidbits.com)
License: MIT

Features

• Supports all cron expression special characters including * / , - ? L W, #
• Supports 5, 6 (w/ seconds or year), or 7 (w/ seconds and year) part cron expressions
• Provides casing options (Sentence, Title, Lower, etc.)
• Localization with support for 14 languages
• Supports Python 2.7 - 3.5

Installation

Using PIP

pip install cron-descriptor

Usage example

# Simple
from cron_descriptor import get_description, ExpressionDescriptor

print(get_description("* 2 3 * *"))

#OR

print(str(ExpressionDescriptor("* 2 3 * *")))

# Advanced
# Consult Options.py/CasingTypeEnum.py/DescriptionTypeEnum.py for more info
from cron_descriptor import Options, CasingTypeEnum, DescriptionTypeEnum, ExpressionDescriptor

descripter = ExpressionDescriptor("*/10 * * * *", throw_exception_on_parse_error = True, casing_type = CasingTypeEnum.Sentence, use_24hour_time_format = True)
# GetDescription uses DescriptionTypeEnum.FULL by default:
print(descripter.get_description())
print("{}".format(descripter))

#or passing Options class as second argument:

options = Options()
options.throw_exception_on_parse_error = True
options.casing_type = CasingTypeEnum.Sentence
options.use_24hour_time_format = True
descripter = ExpressionDescriptor("*/10 * * * *", options)
print(descripter.get_description(DescriptionTypeEnum.FULL))

Languages Available

Language	locale_code	contributor
English	en	Brady Holt
Brazilian	pt_PT	Renato Lima
Chinese Simplified	zh_CN	Star Peng
Spanish	es_ES	Ivan Santos
Norwegian	nb_NO	Siarhei Khalipski
Turkish	tr_TR	Mustafa SADEDİL
Dutch	nl_NL	TotalMace
Russian	ru_RU	LbISS
French	fr_FR	Arnaud TAMAILLON
German	de_DE	Michael Schuler
Ukrainian	uk_UA	Taras
Italian	it_IT	rinaldihno
Czech	cs_CZ	Adam Schubert
Swedish	sv_SE	Åke Engelbrektson

Original Source

• .NET - https://github.com/bradyholt/cron-expression-descriptor

Ports

• Java - https://github.com/RedHogs/cron-parser
• Ruby - https://github.com/alpinweis/cronex

Running Unit Tests

python setup.py test

Translating

cron-descriptor is using Gettext for translations.

To create new translation or edit existing one, i suggest using Poedit.

You can copy/rename and translate any file from locale directory:

cp ./cron_descriptor/locale/de_DE.po ./cron_descriptor/locale/YOUR_LOCALE_CODE.po
poedit ./cron_descriptor/locale/YOUR_LOCALE_CODE.po

or you can generate new untranslated *.po file from sources by running in cron_descriptor directory:

cd cron_descriptor
xgettext *.py -o locale/YOUR_LOCALE_CODE.po

Generating *.mo file from *.po file. In root directory run command:

msgfmt -o cron_descriptor/locale/YOUR_LOCALE_CODE.mo cron_descriptor/locale/YOUR_LOCALE_CODE.po

Developing

All suggescions and PR's are welcomed

Just clone this repository and register pre-commit hook by running:

ln -s ../../pre-commit.sh .git/hooks/pre-commit

Then install dev requirements:

pip install pep8
pip install flake8
pip install pep8-naming