button config file can be specified

buttond.py

@@ -46,6 +46,8 @@ def main():
     logging.basicConfig(level=log_levels.get(args.verbosity, logging.DEBUG))
     ## output header
     print(f"Version: {__version__}\t{__copyright__}")
+    ## load config files
+    load_config(args.buttons)
     ## run the event loop
     try:
         pause()
@@ -58,6 +60,8 @@ def get_command_arguments():
     parser = argparse.ArgumentParser(
         description='Exec Hog4 comment macros on RasPi GPIO activity.',
         epilog=__copyright__)
+    parser.add_argument('-b', '--buttons', default="buttons.cfg",
+                        help="button configuration file")
     parser.add_argument('-q', '--quiet', action='store_true',
                         help="sets the default log level to 0, otherwise 3.")
     parser.add_argument("-v", dest="verbosity",
@@ -70,6 +74,33 @@ def get_command_arguments():
     return parser.parse_args()
 
 
+def load_config(file):
+    """Load a configuration file."""
+    config = configparser.ConfigParser(allow_no_value=True)
+    log.debug("Loading config from %s", file)
+    config.read(file)
+    # set up each buttons
+    for button in config.get('button', 'names').split(','):
+        try:
+            # move to config section
+            cfg = config[button]
+            # read from settings
+            pin = cfg.get('pin', None)
+            closed = cfg.get('close', None)
+            opened = cfg.get('open', None)
+            # set up button on pin
+            log.debug('init %s on GPIO %s', button, pin)
+            _buttons[button] = Button(pin)
+            # connect button callbacks to anonymous functions
+            log.info('connecting %s "closed" to macro %s', button, closed)
+            _buttons[button].when_pressed = lambda macro=closed: activate(macro)
+            log.info('connecting %s "opened" to macro %s', button, opened)
+            _buttons[button].when_released = lambda macro=opened: activate(macro)
+        except (KeyError, GPIODeviceError) as error:
+            log.error('Error configuring button %s: %s', button, error)
+            continue
+
+
 def activate(macro):
     """Sanitize user configured macros."""
     if macro is None:
@@ -85,39 +116,6 @@ def activate(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
-        log.debug('init %s on GPIO %s', b, pin)
-        _buttons[b] = Button(pin)
-        # connect button callbacks to anonymous functions
-        log.info('connecting %s "closed" to macro %s', b, closed)
-        _buttons[b].when_pressed = lambda macro=closed: _activate(macro)
-        log.info('connecting %s "opened" to macro %s', b, opened)
-        _buttons[b].when_released = lambda macro=opened: _activate(macro)
-
-    except (KeyError, GPIODeviceError) as e:
-        log.error('Error configuring button %s: %s', b, e)
-        continue
-
-
-# clear temp variables off the stack
-try:
-    del pin, closed, opened
-    del c, config
-except NameError as e:
-    log.error('failed to release memory: %s', e)
-
 
 # when run directly, sleep until button signal or KeyboardInterrupt
 if __name__ == '__main__':