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136 lines
4.6 KiB
Python
136 lines
4.6 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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"""Create some singleton objects that are needed for the app to work."""
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import stat
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import re
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import json
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import subprocess
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import evdev
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from keymapper.logger import logger
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from keymapper.mapping import Mapping, DISABLE_NAME, DISABLE_CODE
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from keymapper.paths import get_config_path, touch, USER
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# xkb uses keycodes that are 8 higher than those from evdev
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XKB_KEYCODE_OFFSET = 8
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XMODMAP_FILENAME = 'xmodmap.json'
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class SystemMapping:
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"""Stores information about all available keycodes."""
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def __init__(self):
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"""Construct the system_mapping."""
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self._mapping = {}
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self.populate()
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def list_names(self):
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"""Return an array of all possible names in the mapping."""
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return self._mapping.keys()
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def populate(self):
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"""Get a mapping of all available names to their keycodes."""
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logger.debug('Gathering available keycodes')
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self.clear()
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xmodmap_dict = {}
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try:
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xmodmap = subprocess.check_output(
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['xmodmap', '-pke'],
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stderr=subprocess.STDOUT
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).decode()
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xmodmap = xmodmap.lower()
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mappings = re.findall(r'(\d+) = (.+)\n', xmodmap + '\n')
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for keycode, names in mappings:
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# there might be multiple, like:
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# keycode 64 = Alt_L Meta_L Alt_L Meta_L
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# keycode 204 = NoSymbol Alt_L NoSymbol Alt_L
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# Alt_L should map to code 64. Writing code 204 only works
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# if a modifier is applied at the same time. So take the first
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# one.
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name = names.split()[0]
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xmodmap_dict[name] = int(keycode) - XKB_KEYCODE_OFFSET
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for keycode, names in mappings:
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# but since KP may be mapped like KP_Home KP_7 KP_Home KP_7,
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# make another pass and add all of them if they don't already
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# exist. don't overwrite any keycodes.
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for name in names.split():
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if xmodmap_dict.get(name) is None:
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xmodmap_dict[name] = int(keycode) - XKB_KEYCODE_OFFSET
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except (subprocess.CalledProcessError, FileNotFoundError):
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# might be within a tty
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pass
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if USER != 'root':
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# write this stuff into the key-mapper config directory, because
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# the systemd service won't know the user sessions xmodmap
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path = get_config_path(XMODMAP_FILENAME)
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touch(path)
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with open(path, 'w') as file:
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logger.debug('Writing "%s"', path)
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json.dump(xmodmap_dict, file, indent=4)
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self._mapping.update(xmodmap_dict)
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for name, ecode in evdev.ecodes.ecodes.items():
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if name.startswith('KEY') or name.startswith('BTN'):
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self._set(name, ecode)
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self._set(DISABLE_NAME, DISABLE_CODE)
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def update(self, mapping):
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"""Update this with new keys.
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Parameters
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----------
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mapping : dict
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maps from name to code. Make sure your keys are lowercase.
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"""
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self._mapping.update(mapping)
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def _set(self, name, code):
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"""Map name to code."""
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self._mapping[str(name).lower()] = code
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def get(self, name):
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"""Return the code mapped to the key."""
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return self._mapping.get(str(name).lower())
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def clear(self):
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"""Remove all mapped keys. Only needed for tests."""
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keys = list(self._mapping.keys())
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for key in keys:
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del self._mapping[key]
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# one mapping object for the GUI application
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custom_mapping = Mapping()
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# this mapping represents the xmodmap output, which stays constant
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system_mapping = SystemMapping()
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# permissions for files created in /usr
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_PERMISSIONS = stat.S_IREAD | stat.S_IWRITE | stat.S_IRGRP | stat.S_IROTH
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