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84 lines
2.3 KiB
Python
84 lines
2.3 KiB
Python
#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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# key-mapper - GUI for device specific keyboard mappings
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# Copyright (C) 2021 sezanzeb <proxima@sezanzeb.de>
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#
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# This file is part of key-mapper.
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#
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# key-mapper is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# key-mapper is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with key-mapper. If not, see <https://www.gnu.org/licenses/>.
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"""Functions to handle numlocks.
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For unknown reasons the numlock status can change when starting injections,
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which is why these functions exist.
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"""
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import re
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import subprocess
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from keymapper.logger import logger
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def is_numlock_on():
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"""Get the current state of the numlock."""
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try:
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xset_q = subprocess.check_output(
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["xset", "q"], stderr=subprocess.STDOUT
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).decode()
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num_lock_status = re.search(r"Num Lock:\s+(.+?)\s", xset_q)
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if num_lock_status is not None:
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return num_lock_status[1] == "on"
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return False
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except (FileNotFoundError, subprocess.CalledProcessError):
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# tty
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return None
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def set_numlock(state):
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"""Set the numlock to a given state of True or False."""
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if state is None:
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return
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value = {True: "on", False: "off"}[state]
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try:
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subprocess.check_output(["numlockx", value])
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except subprocess.CalledProcessError:
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# might be in a tty
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pass
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except FileNotFoundError:
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# doesn't seem to be installed everywhere
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logger.debug("numlockx not found")
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def ensure_numlock(func):
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"""Decorator to reset the numlock to its initial state afterwards."""
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def wrapped(*args, **kwargs):
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# for some reason, grabbing a device can modify the num lock state.
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# remember it and apply back later
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numlock_before = is_numlock_on()
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result = func(*args, **kwargs)
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set_numlock(numlock_before)
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return result
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return wrapped
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