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278 lines
8.5 KiB
Python
278 lines
8.5 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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"""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 evdev.ecodes import EV_KEY, BTN_LEFT
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from keymapper.logger import logger
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from keymapper.paths import touch
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from keymapper.config import ConfigBase, config
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from keymapper.key import Key
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DISABLE_NAME = 'disable'
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DISABLE_CODE = -1
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def split_key(key):
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"""Take a key like "1,2,3" and return a 3-tuple of ints."""
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key = key.strip()
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if ',' not in key:
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logger.error('Found invalid key: "%s"', key)
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return None
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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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elif key.count(',') == 2:
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ev_type, code, value = key.split(',')
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else:
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logger.error('Found more than two commas in the key: "%s"', key)
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return None
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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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return None
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return 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 = {} # a mapping of Key objects to strings
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self.changed = False
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# are there actually any keys set in the mapping file?
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self.num_saved_keys = 0
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super().__init__(fallback=config)
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def __iter__(self):
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"""Iterate over Key objects and their symbol."""
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return iter(self._mapping.items())
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def __len__(self):
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return len(self._mapping)
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def set(self, *args):
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"""Set a config value. See `ConfigBase.set`."""
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self.changed = True
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return super().set(*args)
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def remove(self, *args):
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"""Remove a config value. See `ConfigBase.remove`."""
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self.changed = True
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return super().remove(*args)
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def change(self, new_key, symbol, 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 : Key
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symbol : string
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A single symbol known to xkb or linux.
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Examples: KEY_KP1, Shift_L, a, B, BTN_LEFT.
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previous_key : Key or None
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the previous 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, 10, 1) here.
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"""
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if not isinstance(new_key, Key):
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raise TypeError(f'Expected {new_key} to be a Key object')
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if symbol is None:
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raise ValueError('Expected `symbol` not to be None')
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symbol = symbol.strip()
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logger.debug('%s will map to "%s"', new_key, symbol)
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self.clear(new_key) # this also clears all equivalent keys
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self._mapping[new_key] = symbol
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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 : Key
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"""
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if not isinstance(key, Key):
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raise TypeError('Expected key to be a Key object')
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for permutation in key.get_permutations():
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if permutation in self._mapping:
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logger.debug('%s will be cleared', permutation)
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del self._mapping[permutation]
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self.changed = True
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# there should be only one variation of the permutations
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# in the mapping actually
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def empty(self):
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"""Remove all mappings and custom configs without saving."""
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self._mapping = {}
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self.changed = True
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self.clear_config()
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def load(self, path):
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"""Load a dumped JSON from home to overwrite the mappings.
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Parameters
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path : string
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Path of the preset file
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"""
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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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raise FileNotFoundError(
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f'Tried to load non-existing preset "{path}"'
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)
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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(
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'Expected mapping to be a dict, but was %s. '
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'Invalid preset config at "%s"',
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preset_dict.get('mapping'), path
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)
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return
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for key, symbol in preset_dict['mapping'].items():
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try:
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key = Key(*[
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split_key(chunk) for chunk in key.split('+')
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if chunk.strip() != ''
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])
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except ValueError as error:
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logger.error(str(error))
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continue
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if None in key:
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continue
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logger.spam('%s maps to %s', key, symbol)
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self._mapping[key] = symbol
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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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self.num_saved_keys = len(self)
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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, path):
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"""Dump as JSON into home."""
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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 '
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'key: %s',
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self._config.get('mapping')
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)
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preset_dict = self._config.copy() # shallow copy
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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([
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','.join([
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str(value)
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for value in sub_key
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])
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for sub_key in key
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])
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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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self.num_saved_keys = len(self)
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def get_symbol(self, key):
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"""Read the symbol that is mapped to this keycode.
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Parameters
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----------
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key : Key
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"""
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if not isinstance(key, Key):
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raise TypeError('Expected key to be a Key object')
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for permutation in key.get_permutations():
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existing = self._mapping.get(permutation)
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if existing is not None:
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return existing
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return None
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def dangerously_mapped_btn_left(self):
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"""Return True if this mapping disables BTN_Left."""
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if self.get_symbol(Key(EV_KEY, BTN_LEFT, 1)) is not None:
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values = [value.lower() for value in self._mapping.values()]
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return 'btn_left' not in values
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return False
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