ContactPi/buttond.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""buttond.py: Watch a Rasberry Pi GPIO button. Exec Hog4 comment macros."""

__author__ = "Kevin Matz"
__copyright__ = "Copyright 2019, Company 235, LLC"
__credits__ = ["Kevin Matz"]

__license__ = "MIT"
__version__ = "1.0"
__maintainer__ = "Kevin Matz"
__email__ = "kevin@company235.com"

__status__ = "Prototype"

import configparser
from signal import pause
from baconscript import comment
from gpiozero import Button, GPIODeviceError

# use mock pins when not working on Pi hardware
# from gpiozero.pins.mock import MockFactory
# from gpiozero import Device
# Device.pin_factory = MockFactory()


# callback intermidiary to sanitize user input
def _activate(macro):
    if macro is None:
        return
    macro = macro.strip('\"').upper()
    if macro == "":
        return
    # pass macro to baconscript
    print("doing macro ", macro)
    comment(macro)


# empty button directory
_buttons = {}

# open config file
config = configparser.ConfigParser(allow_no_value=True)
config.read('buttons.cfg')
# set up each buttons
for b in config.get('button', 'names').split(','):
    try:
        # move to config section
        c = config[b]
        # read from settings
        pin = c.get('pin', None)
        closed = c.get('close', None)
        opened = c.get('open', None)
        # set up button on pin
        print('init', b, 'on GPIO', pin)
        _buttons[b] = Button(pin)
        # connect button callbacks to anonymous functions
        print('connecting', b, '"closed" to macro', closed)
        _buttons[b].when_pressed = lambda macro=closed: _activate(macro)
        print('connecting', b, '"opened" to macro', opened)
        _buttons[b].when_released = lambda macro=opened: _activate(macro)

    except (KeyError, GPIODeviceError) as e:
        print('Error configuring button', b, e)
        continue


# clear temp variables off the stack
try:
    del pin, closed, opened
    del c, config
except NameError as e:
    print('failed to release memory', e)


# when run directly, sleep until button signal or KeyboardInterrupt
if __name__ == '__main__':
    try:
        pause()
    except KeyboardInterrupt:
        print()
else:
    # indicate prefered method of sleeping when laoded as a module
    print('call signal.pause() instead of time.sleep()')