"""Displays the number of pending tasks in TaskWarrior.

Requires the following library:
    * taskw

Parameters:
    * taskwarrior.taskrc : path to the taskrc file (defaults to ~/.taskrc)
"""

from taskw import TaskWarrior

import core.module
import core.widget
import core.decorators

class Module(core.module.Module):
    def __init__(self, config):
        super().__init__(config, core.widget.Widget(self.output))

        self.__pending_tasks = '0'

    def update(self):
        """Return a string with the number of pending tasks from TaskWarrior."""
        try:
            taskrc = self.parameter('taskrc', '~/.taskrc')
            w = TaskWarrior(config_filename=taskrc)
            pending_tasks = w.filter_tasks({'status': 'pending'})
            self.__pending_tasks = str(len(pending_tasks))
        except:
            self.__pending_tasks = 'n/a'

    def output(self, _):
        """Format the task counter to output in bumblebee."""
        return '{}'.format(self.__pending_tasks)

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