Example for BaseTask and ClosestDateParameter example

closest_example.py

#!/usr/bin/env python
# coding: utf-8

"""
1) SimpleTask will "know" its output `path`.
2) ClosestDateParameter helps to map multiple dates to a single date,
   e.g. I want to be able to call the task every day, but the output
   from the most recent Monday will be enough.
"""

from gluish.parameter import ClosestDateParameter
from gluish.task import BaseTask
import datetime, luigi


class SimpleTask(BaseTask):
    date = ClosestDateParameter(default=datetime.date.today())

    def closest(self):
        # for simplicity, only map this task to the *closest* Monday
        return self.date - datetime.timedelta(days=self.date.weekday())

    def run(self):
        with self.output().open('w') as output:
            output.write("It's just another manic Monday!")
    
    def output(self):
        return luigi.LocalTarget(path=self.path(ext='txt'))


if __name__ == '__main__':
    #    January 2014
    # Su Mo Tu We Th Fr Sa
    #           1  2  3  4
    #  5  6  7  8  9 10 11
    # 12 13 14 15 16 17 18
    # 19 20 21 22 23 24 25
    # 26 27 28 29 30 31

    task = SimpleTask(date=datetime.date(2014, 1, 1))
    print(task.output().path) # /tmp/default/SimpleTask/date-2013-12-30.txt

    task = SimpleTask(date=datetime.date(2014, 1, 5))
    print(task.output().path) # /tmp/default/SimpleTask/date-2013-12-30.txt

    task = SimpleTask(date=datetime.date(2014, 1, 6))
    print(task.output().path) # /tmp/default/SimpleTask/date-2014-01-06.txt

    task = SimpleTask(date=datetime.date(2014, 1, 7))
    print(task.output().path) # /tmp/default/SimpleTask/date-2014-01-06.txt