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192 lines
6.9 KiB
Python
192 lines
6.9 KiB
Python
#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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# input-remapper - GUI for device specific keyboard mappings
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# Copyright (C) 2022 sezanzeb <proxima@sezanzeb.de>
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#
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# This file is part of input-remapper.
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#
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# input-remapper 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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# input-remapper 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 input-remapper. If not, see <https://www.gnu.org/licenses/>.
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"""Make the systems/environments mapping of keys and codes accessible."""
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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 inputremapper.logger import logger
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from inputremapper.configs.paths import get_config_path, touch
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from inputremapper.utils import is_service
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DISABLE_NAME = "disable"
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DISABLE_CODE = -1
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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 = None
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self._xmodmap = None
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self._case_insensitive_mapping = None
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def __getattribute__(self, wanted):
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"""To lazy load system_mapping info only when needed.
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For example, this helps to keep logs of input-remapper-control clear when it
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doesnt need it the information.
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"""
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lazy_loaded_attributes = ["_mapping", "_xmodmap", "_case_insensitive_mapping"]
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for lazy_loaded_attribute in lazy_loaded_attributes:
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if wanted != lazy_loaded_attribute:
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continue
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if object.__getattribute__(self, lazy_loaded_attribute) is None:
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object.__setattr__(self, lazy_loaded_attribute, {})
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object.__getattribute__(self, "populate")()
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return object.__getattribute__(self, wanted)
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def list_names(self, codes=None):
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"""Return a list of all possible names in the mapping, optionally filtered by codes.
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Parameters
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----------
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codes: list of event codes
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"""
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if not codes:
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return self._mapping.keys()
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return [name for name, code in self._mapping.items() if code in codes]
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def correct_case(self, symbol):
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"""Return the correct casing for a symbol."""
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if symbol in self._mapping:
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return symbol
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# only if not e.g. both "a" and "A" are in the mapping
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return self._case_insensitive_mapping.get(symbol.lower(), symbol)
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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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if not is_service():
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# xmodmap is only available from within the login session.
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# The service that runs via systemd can't use this.
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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"], stderr=subprocess.STDOUT
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).decode()
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xmodmap = xmodmap
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self._xmodmap = re.findall(r"(\d+) = (.+)\n", xmodmap + "\n")
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xmodmap_dict = self._find_legit_mappings()
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if len(xmodmap_dict) == 0:
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logger.info("`xmodmap -pke` did not yield any symbol")
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except FileNotFoundError:
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logger.info(
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"Optional `xmodmap` command not found. This is not critical."
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)
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except subprocess.CalledProcessError as e:
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logger.error('Call to `xmodmap -pke` failed with "%s"', e)
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# Clients usually take care of that, don't let the service do funny things.
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# Write this stuff into the input-remapper 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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for name, code in xmodmap_dict.items():
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self._set(name, code)
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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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len_before = len(self._mapping)
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for name, code in mapping.items():
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self._set(name, code)
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logger.debug(
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"Updated keycodes with %d new ones", len(self._mapping) - len_before
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)
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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)] = code
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self._case_insensitive_mapping[str(name).lower()] = name
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def get(self, name) -> int:
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"""Return the code mapped to the key."""
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# the correct casing should be shown when asking the system_mapping
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# for stuff. indexing case insensitive to support old presets.
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if name not in self._mapping:
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# only if not e.g. both "a" and "A" are in the mapping
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name = self._case_insensitive_mapping.get(str(name).lower())
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return self._mapping.get(name)
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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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def get_name(self, code):
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"""Get the first matching name for the code."""
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for entry in self._xmodmap:
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if int(entry[0]) - XKB_KEYCODE_OFFSET == code:
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return entry[1].split()[0]
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return None
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def _find_legit_mappings(self):
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"""From the parsed xmodmap list find usable symbols and their codes."""
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xmodmap_dict = {}
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for keycode, names in self._xmodmap:
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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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return xmodmap_dict
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# this mapping represents the xmodmap output, which stays constant
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system_mapping = SystemMapping()
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