mirror of
https://github.com/sezanzeb/input-remapper
synced 2024-11-04 12:00:16 +00:00
229 lines
7.6 KiB
Python
229 lines
7.6 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) 2020 sezanzeb <proxima@hip70890b.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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"""Contains and manages mappings."""
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import os
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import json
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import copy
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from keymapper.logger import logger
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from keymapper.paths import get_config_path, touch
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from keymapper.config import ConfigBase, config
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def verify_key(key):
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"""Check if the key describes a tuple of (type, code, value) ints."""
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if len(key) != 3:
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raise ValueError(f'Expected keys to be a 3-tuple, but got {key}')
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if sum([not isinstance(value, int) for value in key]) != 0:
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raise ValueError(f'Can only use numbers in the tuples, but got {key}')
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class Mapping(ConfigBase):
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"""Contains and manages mappings and config of a single preset."""
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def __init__(self):
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self._mapping = {}
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self.changed = False
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super().__init__(fallback=config)
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def __iter__(self):
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"""Iterate over tuples of unique keycodes and their character."""
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return iter(sorted(self._mapping.items()))
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def __len__(self):
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return len(self._mapping)
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def change(self, new_key, character, previous_key=None):
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"""Replace the mapping of a keycode with a different one.
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Parameters
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----------
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new_key : int, int, int
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the new key. (type, code, value). key as in hashmap-key
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0: type, one of evdev.events, taken from the original source
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event. Everything will be mapped to EV_KEY.
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1: The source keycode, what the mouse would report without any
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modification.
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2. The value. 1 (down), 2 (up) or any
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other value that the device reports. Gamepads use a continuous
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space of values for joysticks and triggers.
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character : string
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A single character known to xkb or linux.
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Examples: KP_1, Shift_L, a, B, BTN_LEFT.
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previous_key : int, int, int
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the previous key, same format as new_key
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If not set, will not remove any previous mapping. If you recently
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used (1, 10, 1) for new_key and want to overwrite that with
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(1, 11, 1), provide (1, 5, 1) here.
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"""
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if character is None:
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raise ValueError('Expected `character` not to be None')
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verify_key(new_key)
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if previous_key:
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verify_key(previous_key)
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logger.debug(
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'%s will map to %s, replacing %s',
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new_key, character, previous_key
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)
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self._mapping[new_key] = character
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if previous_key is not None:
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code_changed = new_key != previous_key
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if code_changed:
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# clear previous mapping of that code, because the line
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# representing that one will now represent a different one
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self.clear(previous_key)
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self.changed = True
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def clear(self, key):
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"""Remove a keycode from the mapping.
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Parameters
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----------
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key : int, int, int
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keycode : int
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ev_type : int
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one of evdev.events. codes may be the same for various
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event types.
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value : int
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event value. Usually you want 1 (down)
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"""
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verify_key(key)
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if self._mapping.get(key) is not None:
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logger.debug('%s will be cleared', key)
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del self._mapping[key]
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self.changed = True
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return
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logger.error('Unknown key %s', key)
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def empty(self):
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"""Remove all mappings."""
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self._mapping = {}
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self.changed = True
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def load(self, device, preset):
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"""Load a dumped JSON from home to overwrite the mappings."""
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path = get_config_path(device, preset)
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logger.info('Loading preset from "%s"', path)
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if not os.path.exists(path):
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logger.error('Tried to load non-existing preset "%s"', path)
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return
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self.clear_config()
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with open(path, 'r') as file:
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preset_dict = json.load(file)
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if not isinstance(preset_dict.get('mapping'), dict):
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logger.error('Invalid preset config at "%s"', path)
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return
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for key, character in preset_dict['mapping'].items():
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if ',' not in key:
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logger.error('Found invalid key: "%s"', key)
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continue
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if key.count(',') == 1:
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# support for legacy mapping objects that didn't include
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# the value in the key
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ev_type, code = key.split(',')
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value = 1
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if key.count(',') == 2:
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ev_type, code, value = key.split(',')
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try:
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key = (int(ev_type), int(code), int(value))
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except ValueError:
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logger.error('Found non-int in: "%s"', key)
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continue
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logger.spam('%s maps to %s', key, character)
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self._mapping[key] = character
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# add any metadata of the mapping
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for key in preset_dict:
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if key == 'mapping':
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continue
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self._config[key] = preset_dict[key]
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self.changed = False
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def clone(self):
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"""Create a copy of the mapping."""
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mapping = Mapping()
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mapping._mapping = copy.deepcopy(self._mapping)
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mapping.changed = self.changed
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return mapping
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def save(self, device, preset):
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"""Dump as JSON into home."""
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path = get_config_path(device, preset)
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logger.info('Saving preset to %s', path)
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touch(path)
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with open(path, 'w') as file:
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if self._config.get('mapping') is not None:
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logger.error(
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'"mapping" is reserved and cannot be used as config key'
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)
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preset_dict = self._config
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# make sure to keep the option to add metadata if ever needed,
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# so put the mapping into a special key
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json_ready_mapping = {}
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# tuple keys are not possible in json, encode them as string
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for key, value in self._mapping.items():
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new_key = ','.join([str(value) for value in key])
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json_ready_mapping[new_key] = value
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preset_dict['mapping'] = json_ready_mapping
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json.dump(preset_dict, file, indent=4)
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file.write('\n')
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self.changed = False
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def get_character(self, key):
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"""Read the character that is mapped to this keycode.
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Parameters
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----------
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key : int, int, int
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keycode : int
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ev_type : int
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one of evdev.events. codes may be the same for various
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event types.
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value : int
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event value. Usually you want 1 (down)
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"""
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return self._mapping.get(key)
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