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252 lines
8.8 KiB
Python
252 lines
8.8 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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"""Inject a keycode based on the mapping."""
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import itertools
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import asyncio
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from evdev.ecodes import EV_KEY, EV_ABS
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from keymapper.logger import logger, is_debug
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from keymapper.mapping import DISABLE_CODE
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# maps mouse buttons to macro instances that have been executed. They may
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# still be running or already be done. Just like unreleased, this is a
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# mapping of (type, code). The value is not included in the key, because
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# a key release event with a value of 0 needs to be able to find the
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# running macro. The downside is that a d-pad cannot execute two macros at
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# once, one for each direction. Only sequentially.
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active_macros = {}
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# mapping of future up event (type, code) to (output code, input event)
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# This is needed in order to release the correct event mapped on a
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# D-Pad. Each direction on one D-Pad axis reports the same type and
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# code, but different values. There cannot be both at the same time,
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# as pressing one side of a D-Pad forces the other side to go up.
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# "I have got this release event, what was this for?"
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# It maps to (output_code, input_event) with input_event being the
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# same as the key, but with the value of e.g. -1 or 1. The complete
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# 3-tuple output event is used to track if a combined button press was done.
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# A combination might be desired for D-Pad left, but not D-Pad right.
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# (what_will_be_released, what_caused_the_key_down)
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unreleased = {}
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def is_key_down(event):
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"""Is this event a key press."""
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return event.value != 0
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def is_key_up(event):
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"""Is this event a key release."""
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return event.value == 0
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def write(uinput, key):
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"""Shorthand to write stuff."""
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uinput.write(*key)
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uinput.syn()
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COMBINATION_INCOMPLETE = 1 # not all keys of the combination are pressed
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NOT_COMBINED = 2 # this key is not part of a combination
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def subsets(combination):
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"""Return a list of subsets of the combination.
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If combination is only one element long it returns an empty list,
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because it's not a combination and there is no reason to iterate.
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Parameters
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-----------
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combination : tuple
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tuple of 3-tuples, each being int, int, int (type, code, value)
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"""
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combination = list(combination)
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lengths = list(range(2, len(combination) + 1))
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lengths.reverse()
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return list(itertools.chain.from_iterable(
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itertools.combinations(combination, length)
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for length in lengths
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))
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def log(key, msg, *args):
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"""Function that logs nicely formatted spams."""
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if not is_debug():
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return
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msg = msg % args
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str_key = str(key)
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str_key = str_key.replace(',)', ')')
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spacing = ' ' + '-' * max(0, 30 - len(str_key))
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if len(spacing) == 1:
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spacing = ''
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msg = f'{str_key}{spacing} {msg}'
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logger.spam(msg)
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return msg
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def handle_keycode(key_to_code, macros, event, uinput):
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"""Write mapped keycodes, forward unmapped ones and manage macros.
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As long as the provided event is mapped it will handle it, it won't
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check any type, code or capability anymore. Otherwise it forwards
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it as it is.
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Parameters
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----------
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key_to_code : dict
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mapping of (type, code, value) to linux-keycode
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or multiple of those like ((...), (...), ...) for combinations
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combinations need to be present in every possible valid ordering.
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e.g. shift + alt + a and alt + shift + a
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macros : dict
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mapping of (type, code, value) to _Macro objects.
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Combinations work similar as in key_to_code
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event : evdev.InputEvent
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"""
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if event.type == EV_KEY and event.value == 2:
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# button-hold event. Linux creates them on its own for the
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# injection-fake-device if the release event won't appear,
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# no need to forward or map them.
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return
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# The key used to index the mappings `key_to_code` and `macros`
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key = (event.type, event.code, event.value)
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# the tuple of the actual input event. Used to forward the event if it is
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# not mapped, and to index unreleased and active_macros
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event_tuple = (event.type, event.code, event.value)
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type_code = (event.type, event.code)
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# the triggering key-down has to be the last element in combination, all
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# others can have any arbitrary order. By checking all unreleased keys,
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# a + b + c takes priority over b + c, if both mappings exist.
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# WARNING! the combination-down triggers, but a single key-up releases.
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# Do not check if key in macros and such, if it is an up event. It's
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# going to be False.
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combination = tuple([value[1] for value in unreleased.values()] + [key])
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# find any triggered combination. macros and key_to_code contain
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# every possible equivalent permutation of possible macros. The last
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# key in the combination needs to remain the newest key though.
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for subset in subsets(combination):
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if subset[-1] != key:
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# only combinations that are completed and triggered by the
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# newest input are of interest
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continue
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if subset in macros or subset in key_to_code:
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key = subset
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break
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else:
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# no subset found, just use the key. all indices are tuples of tuples,
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# both for combinations and single keys.
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if event.value == 1 and len(combination) > 1:
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log(combination, 'unknown combination')
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key = (key,)
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active_macro = active_macros.get(type_code)
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"""Releasing keys and macros"""
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if is_key_up(event):
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if active_macro is not None and active_macro.holding:
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# Tell the macro for that keycode that the key is released and
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# let it decide what to do with that information.
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active_macro.release_key()
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log(key, 'releasing macro')
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if type_code in unreleased:
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target_type, target_code = unreleased[type_code][0]
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del unreleased[type_code]
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if target_code == DISABLE_CODE:
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log(key, 'releasing disabled key')
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else:
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log(key, 'releasing %s', target_code)
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write(uinput, (target_type, target_code, 0))
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elif event.type != EV_ABS:
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# ABS events might be spammed like crazy every time the position
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# slightly changes
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log(key, 'unexpected key up')
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# everything that can be released is released now
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return
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"""Filtering duplicate key downs"""
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if is_key_down(event):
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# it would start a macro usually
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if key in macros and active_macro is not None and active_macro.running:
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# for key-down events and running macros, don't do anything.
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# This avoids spawning a second macro while the first one is not
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# finished, especially since gamepad-triggers report a ton of
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# events with a positive value.
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log(key, 'macro already running')
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return
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# it would write a key usually
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if key in key_to_code and type_code in unreleased:
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# duplicate key-down. skip this event. Avoid writing millions of
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# key-down events when a continuous value is reported, for example
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# for gamepad triggers
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log(key, 'duplicate key down')
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return
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"""starting new macros or injecting new keys"""
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if is_key_down(event):
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if key in macros:
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macro = macros[key]
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active_macros[type_code] = macro
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macro.press_key()
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log(key, 'maps to macro %s', macro.code)
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asyncio.ensure_future(macro.run())
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return
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if key in key_to_code:
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target_code = key_to_code[key]
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unreleased[type_code] = ((EV_KEY, target_code), event_tuple)
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if target_code == DISABLE_CODE:
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log(key, 'disabled')
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return
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log(key, 'maps to %s', target_code)
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write(uinput, (EV_KEY, target_code, 1))
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return
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log(key, 'forwarding')
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unreleased[type_code] = ((event_tuple[:2]), event_tuple)
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write(uinput, event_tuple)
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return
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logger.error(key, '%s unhandled. %s %s', unreleased, active_macros)
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