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731 lines
22 KiB
Python
731 lines
22 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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"""Executes more complex patterns of keystrokes.
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To keep it short on the UI, basic functions are one letter long.
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The outermost macro (in the examples below the one created by 'r',
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'r' and 'w') will be started, which triggers a chain reaction to execute
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all of the configured stuff.
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Examples
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--------
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r(3, k(a).w(10)): a <10ms> a <10ms> a
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r(2, k(a).k(-)).k(b): a - a - b
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w(1000).m(Shift_L, r(2, k(a))).w(10).k(b): <1s> A A <10ms> b
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"""
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import asyncio
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import re
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import traceback
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import copy
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import multiprocessing
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import atexit
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import select
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from evdev.ecodes import ecodes, EV_KEY, EV_REL, REL_X, REL_Y, REL_WHEEL, \
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REL_HWHEEL
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from keymapper.logger import logger
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from keymapper.state import system_mapping
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class SharedDict:
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"""Share a dictionary across processes."""
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# because unittests terminate all child processes in cleanup I can't use
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# multiprocessing.Manager
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def __init__(self):
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"""Create a shared dictionary."""
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super().__init__()
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self.pipe = multiprocessing.Pipe()
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self.process = None
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atexit.register(self._stop)
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self._start()
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# To avoid blocking forever if something goes wrong. The maximum
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# observed time communication takes was 0.001 for me on a slow pc
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self._timeout = 0.02
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def _start(self):
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"""Ensure the process to manage the dictionary is running."""
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if self.process is not None and self.process.is_alive():
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return
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# if the manager has already been running in the past but stopped
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# for some reason, the dictionary contents are lost
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self.process = multiprocessing.Process(target=self.manage)
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self.process.start()
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def manage(self):
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"""Manage the dictionary, handle read and write requests."""
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shared_dict = dict()
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while True:
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message = self.pipe[0].recv()
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logger.spam('SharedDict got %s', message)
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if message[0] == 'stop':
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return
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if message[0] == 'set':
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shared_dict[message[1]] = message[2]
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if message[0] == 'get':
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self.pipe[0].send(shared_dict.get(message[1]))
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if message[0] == 'ping':
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self.pipe[0].send('pong')
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def _stop(self):
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"""Stop the managing process."""
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self.pipe[1].send(('stop',))
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def get(self, key):
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"""Get a value from the dictionary."""
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return self.__getitem__(key)
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def is_alive(self, timeout=None):
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"""Check if the manager process is running."""
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self.pipe[1].send(('ping',))
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select.select([self.pipe[1]], [], [], timeout or self._timeout)
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if self.pipe[1].poll():
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return self.pipe[1].recv() == 'pong'
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return False
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def __setitem__(self, key, value):
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self.pipe[1].send(('set', key, value))
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def __getitem__(self, key):
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self.pipe[1].send(('get', key))
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select.select([self.pipe[1]], [], [], self._timeout)
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if self.pipe[1].poll():
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return self.pipe[1].recv()
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logger.error('select.select timed out')
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return None
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def __del__(self):
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self._stop()
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macro_variables = SharedDict()
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def is_this_a_macro(output):
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"""Figure out if this is a macro."""
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if not isinstance(output, str):
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return False
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if '+' in output.strip():
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# for example "a + b"
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return True
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return '(' in output and ')' in output and len(output) >= 4
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class _Macro:
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"""Supports chaining and preparing actions.
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Calling functions like keycode on _Macro doesn't inject any events yet,
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it means that once .run is used it will be executed along with all other
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queued tasks.
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Those functions need to construct an asyncio coroutine and append it to
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self.tasks. This makes parameter checking during compile time possible.
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Coroutines receive a handler as argument, which is a function that can be
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used to inject input events into the system.
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"""
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def __init__(self, code, mapping):
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"""Create a macro instance that can be populated with tasks.
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Parameters
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----------
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code : string or None
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The original parsed code, for logging purposes.
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mapping : Mapping
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The preset object, needed for some config stuff
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"""
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self.code = code
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self.mapping = mapping
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# List of coroutines that will be called sequentially.
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# This is the compiled code
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self.tasks = []
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# is a lock so that h() can be realized
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self._holding_lock = asyncio.Lock()
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self.running = False
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# all required capabilities, without those of child macros
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self.capabilities = {
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EV_KEY: set(),
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EV_REL: set(),
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}
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self.child_macros = []
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self.keystroke_sleep_ms = None
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def is_holding(self):
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"""Check if the macro is waiting for a key to be released."""
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return self._holding_lock.locked()
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def get_capabilities(self):
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"""Resolve all capabilities of the macro and those of its children."""
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capabilities = copy.deepcopy(self.capabilities)
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for macro in self.child_macros:
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macro_capabilities = macro.get_capabilities()
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for ev_type in macro_capabilities:
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if ev_type not in capabilities:
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capabilities[ev_type] = set()
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capabilities[ev_type].update(macro_capabilities[ev_type])
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return capabilities
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async def run(self, handler):
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"""Run the macro.
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Parameters
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----------
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handler : function
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Will receive int type, code and value for an event to write
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"""
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if self.running:
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logger.error('Tried to run already running macro "%s"', self.code)
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return
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self.keystroke_sleep_ms = self.mapping.get('macros.keystroke_sleep_ms')
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self.running = True
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for task in self.tasks:
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# one could call tasks the compiled macros. it's lambda functions
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# that receive the handler as an argument, so that they know
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# where to send the event to.
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coroutine = task(handler)
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if asyncio.iscoroutine(coroutine):
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await coroutine
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# done
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self.running = False
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def press_key(self):
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"""The user pressed the key down."""
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if self.is_holding():
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logger.error('Already holding')
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return
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asyncio.ensure_future(self._holding_lock.acquire())
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for macro in self.child_macros:
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macro.press_key()
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def release_key(self):
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"""The user released the key."""
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if self._holding_lock is not None:
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self._holding_lock.release()
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for macro in self.child_macros:
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macro.release_key()
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def hold(self, macro=None):
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"""Loops the execution until key release."""
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async def hold_block(_):
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# wait until the key is released. Only then it will be
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# able to acquire the lock. Release it right after so that
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# it can be acquired by press_key again.
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try:
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await self._holding_lock.acquire()
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self._holding_lock.release()
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except RuntimeError as error:
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# The specific bug in question has been fixed already,
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# but lets keep this check here for the future. Not
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# catching errors here causes the macro to never be
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# released
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logger.error('Failed h(): %s', error)
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if macro is None:
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# no parameters: block until released
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self.tasks.append(hold_block)
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return
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if not isinstance(macro, _Macro):
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# if macro is a key name, hold down the key while the actual
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# keyboard key is held down
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symbol = str(macro)
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code = system_mapping.get(symbol)
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if code is None:
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raise KeyError(f'Unknown key "{symbol}"')
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self.capabilities[EV_KEY].add(code)
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self.tasks.append(lambda handler: handler(EV_KEY, code, 1))
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self.tasks.append(hold_block)
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self.tasks.append(lambda handler: handler(EV_KEY, code, 0))
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return
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if isinstance(macro, _Macro):
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# repeat the macro forever while the key is held down
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async def task(handler):
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while self.is_holding():
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# run the child macro completely to avoid
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# not-releasing any key
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await macro.run(handler)
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self.tasks.append(task)
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self.child_macros.append(macro)
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def modify(self, modifier, macro):
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"""Do stuff while a modifier is activated.
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Parameters
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----------
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modifier : str
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macro : _Macro
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"""
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if not isinstance(macro, _Macro):
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raise ValueError(
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'Expected the second param for m (modify) to be '
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f'a macro (like k(a)), but got {macro}'
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)
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modifier = str(modifier)
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code = system_mapping.get(modifier)
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if code is None:
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raise KeyError(f'Unknown modifier "{modifier}"')
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self.capabilities[EV_KEY].add(code)
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self.child_macros.append(macro)
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self.tasks.append(lambda handler: handler(EV_KEY, code, 1))
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self.tasks.append(self._keycode_pause)
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self.tasks.append(macro.run)
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self.tasks.append(self._keycode_pause)
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self.tasks.append(lambda handler: handler(EV_KEY, code, 0))
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self.tasks.append(self._keycode_pause)
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def repeat(self, repeats, macro):
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"""Repeat actions.
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Parameters
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----------
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repeats : int or _Macro
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macro : _Macro
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"""
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if not isinstance(macro, _Macro):
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raise ValueError(
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'Expected the second param for r (repeat) to be '
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f'a macro (like k(a)), but got "{macro}"'
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)
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try:
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repeats = int(repeats)
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except ValueError as error:
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raise ValueError(
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'Expected the first param for r (repeat) to be '
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f'a number, but got "{repeats}"'
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) from error
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async def repeat(handler):
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for _ in range(repeats):
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await macro.run(handler)
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self.tasks.append(repeat)
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self.child_macros.append(macro)
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async def _keycode_pause(self, _=None):
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"""To add a pause between keystrokes."""
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await asyncio.sleep(self.keystroke_sleep_ms / 1000)
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def keycode(self, symbol):
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"""Write the symbol."""
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symbol = str(symbol)
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code = system_mapping.get(symbol)
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if code is None:
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raise KeyError(f'Unknown key "{symbol}"')
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self.capabilities[EV_KEY].add(code)
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async def keycode(handler):
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handler(EV_KEY, code, 1)
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await self._keycode_pause()
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handler(EV_KEY, code, 0)
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await self._keycode_pause()
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self.tasks.append(keycode)
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def event(self, ev_type, code, value):
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"""Write any event.
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Parameters
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----------
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ev_type: str or int
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examples: 2, 'EV_KEY'
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code : int or int
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examples: 52, 'KEY_A'
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value : int
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"""
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if isinstance(ev_type, str):
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ev_type = ecodes[ev_type.upper()]
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if isinstance(code, str):
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code = ecodes[code.upper()]
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if ev_type not in self.capabilities:
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self.capabilities[ev_type] = set()
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if ev_type == EV_REL:
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# add all capabilities that are required for the display server
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# to recognize the device as mouse
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self.capabilities[EV_REL].add(REL_X)
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self.capabilities[EV_REL].add(REL_Y)
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self.capabilities[EV_REL].add(REL_WHEEL)
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self.capabilities[ev_type].add(code)
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self.tasks.append(lambda handler: handler(ev_type, code, value))
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self.tasks.append(self._keycode_pause)
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def mouse(self, direction, speed):
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"""Shortcut for h(e(...))."""
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code, value = {
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'up': (REL_Y, -1),
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'down': (REL_Y, 1),
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'left': (REL_X, -1),
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'right': (REL_X, 1),
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}[direction.lower()]
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value *= speed
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child_macro = _Macro(None, self.mapping)
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child_macro.event(EV_REL, code, value)
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self.hold(child_macro)
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def wheel(self, direction, speed):
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"""Shortcut for h(e(...))."""
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code, value = {
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'up': (REL_WHEEL, 1),
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'down': (REL_WHEEL, -1),
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'left': (REL_HWHEEL, 1),
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'right': (REL_HWHEEL, -1),
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}[direction.lower()]
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child_macro = _Macro(None, self.mapping)
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child_macro.event(EV_REL, code, value)
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child_macro.wait(100 / speed)
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self.hold(child_macro)
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def wait(self, sleeptime):
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"""Wait time in milliseconds."""
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try:
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sleeptime = int(sleeptime)
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except ValueError as error:
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raise ValueError(
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'Expected the param for w (wait) to be '
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f'a number, but got "{sleeptime}"'
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) from error
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sleeptime /= 1000
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async def sleep(_):
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await asyncio.sleep(sleeptime)
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self.tasks.append(sleep)
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def set(self, variable, value):
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"""Set a variable to a certain value."""
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async def set(_):
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logger.debug('"%s" set to "%s"', variable, value)
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macro_variables[variable] = value
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self.tasks.append(set)
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def ifeq(self, variable, value, then, otherwise=None):
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"""Perform an equality check.
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Parameters
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----------
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variable : string
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value : string | number
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then : any
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otherwise : any
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"""
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if not isinstance(then, _Macro):
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raise ValueError(
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'Expected the third param for ifeq to be '
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f'a macro (like k(a)), but got "{then}"'
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)
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if otherwise and not isinstance(otherwise, _Macro):
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raise ValueError(
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'Expected the fourth param for ifeq to be '
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f'a macro (like k(a)), but got "{otherwise}"'
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)
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async def ifeq(handler):
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set_value = macro_variables.get(variable)
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logger.debug('"%s" is "%s"', variable, set_value)
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if set_value == value:
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await then.run(handler)
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elif otherwise is not None:
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await otherwise.run(handler)
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self.child_macros.append(then)
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if isinstance(otherwise, _Macro):
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self.child_macros.append(otherwise)
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self.tasks.append(ifeq)
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def _extract_params(inner):
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"""Extract parameters from the inner contents of a call.
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Parameters
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----------
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inner : string
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for example 'r, r(2, k(a))' should result in ['r', 'r(2, k(a)']
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"""
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inner = inner.strip()
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brackets = 0
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params = []
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start = 0
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for position, char in enumerate(inner):
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if char == '(':
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brackets += 1
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if char == ')':
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brackets -= 1
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if char == ',' and brackets == 0:
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# , potentially starts another parameter, but only if
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# the current brackets are all closed.
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params.append(inner[start:position].strip())
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# skip the comma
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start = position + 1
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# one last parameter
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params.append(inner[start:].strip())
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return params
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def _count_brackets(macro):
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"""Find where the first opening bracket closes."""
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openings = macro.count('(')
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closings = macro.count(')')
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if openings != closings:
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raise Exception(
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f'You entered {openings} opening and {closings} '
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'closing brackets'
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)
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brackets = 0
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position = 0
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for char in macro:
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position += 1
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if char == '(':
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brackets += 1
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continue
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if char == ')':
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brackets -= 1
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if brackets == 0:
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# the closing bracket of the call
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break
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return position
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|
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def _parse_recurse(macro, mapping, macro_instance=None, depth=0):
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"""Handle a subset of the macro, e.g. one parameter or function call.
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|
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Parameters
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----------
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macro : string
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Just like parse
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mapping : Mapping
|
|
The preset configuration
|
|
macro_instance : _Macro or None
|
|
A macro instance to add tasks to
|
|
depth : int
|
|
"""
|
|
# not using eval for security reasons
|
|
assert isinstance(macro, str)
|
|
assert isinstance(depth, int)
|
|
|
|
if macro == '':
|
|
return None
|
|
|
|
if macro_instance is None:
|
|
macro_instance = _Macro(macro, mapping)
|
|
else:
|
|
assert isinstance(macro_instance, _Macro)
|
|
|
|
macro = macro.strip()
|
|
space = ' ' * depth
|
|
|
|
# is it another macro?
|
|
call_match = re.match(r'^(\w+)\(', macro)
|
|
call = call_match[1] if call_match else None
|
|
if call is not None:
|
|
# available functions in the macro and the minimum and maximum number
|
|
# of their parameters
|
|
functions = {
|
|
'm': (macro_instance.modify, 2, 2),
|
|
'r': (macro_instance.repeat, 2, 2),
|
|
'k': (macro_instance.keycode, 1, 1),
|
|
'e': (macro_instance.event, 3, 3),
|
|
'w': (macro_instance.wait, 1, 1),
|
|
'h': (macro_instance.hold, 0, 1),
|
|
'mouse': (macro_instance.mouse, 2, 2),
|
|
'wheel': (macro_instance.wheel, 2, 2),
|
|
'ifeq': (macro_instance.ifeq, 3, 4),
|
|
'set': (macro_instance.set, 2, 2),
|
|
}
|
|
|
|
function = functions.get(call)
|
|
if function is None:
|
|
raise Exception(f'Unknown function {call}')
|
|
|
|
# get all the stuff inbetween
|
|
position = _count_brackets(macro)
|
|
|
|
inner = macro[macro.index('(') + 1:position - 1]
|
|
|
|
# split "3, k(a).w(10)" into parameters
|
|
string_params = _extract_params(inner)
|
|
logger.spam('%scalls %s with %s', space, call, string_params)
|
|
# evaluate the params
|
|
params = [
|
|
_parse_recurse(param.strip(), mapping, None, depth + 1)
|
|
for param in string_params
|
|
]
|
|
|
|
logger.spam('%sadd call to %s with %s', space, call, params)
|
|
|
|
if len(params) < function[1] or len(params) > function[2]:
|
|
if function[1] != function[2]:
|
|
msg = (
|
|
f'{call} takes between {function[1]} and {function[2]}, '
|
|
f'not {len(params)} parameters'
|
|
)
|
|
else:
|
|
msg = (
|
|
f'{call} takes {function[1]}, '
|
|
f'not {len(params)} parameters'
|
|
)
|
|
|
|
raise ValueError(msg)
|
|
|
|
function[0](*params)
|
|
|
|
# is after this another call? Chain it to the macro_instance
|
|
if len(macro) > position and macro[position] == '.':
|
|
chain = macro[position + 1:]
|
|
logger.spam('%sfollowed by %s', space, chain)
|
|
_parse_recurse(chain, mapping, macro_instance, depth)
|
|
|
|
return macro_instance
|
|
|
|
# probably a parameter for an outer function
|
|
try:
|
|
# if possible, parse as int
|
|
macro = int(macro)
|
|
except ValueError:
|
|
# use as string instead
|
|
pass
|
|
|
|
logger.spam('%s%s %s', space, type(macro), macro)
|
|
return macro
|
|
|
|
|
|
def handle_plus_syntax(macro):
|
|
"""transform a + b + c to m(a, m(b, m(c, h())))"""
|
|
if '+' not in macro:
|
|
return macro
|
|
|
|
if '(' in macro or ')' in macro:
|
|
logger.error('Mixing "+" and macros is unsupported: "%s"', macro)
|
|
return macro
|
|
|
|
chunks = [chunk.strip() for chunk in macro.split('+')]
|
|
output = ''
|
|
depth = 0
|
|
for chunk in chunks:
|
|
if chunk == '':
|
|
# invalid syntax
|
|
logger.error('Invalid syntax for "%s"', macro)
|
|
return macro
|
|
|
|
depth += 1
|
|
output += f'm({chunk},'
|
|
|
|
output += 'h()'
|
|
output += depth * ')'
|
|
|
|
logger.debug('Transformed "%s" to "%s"', macro, output)
|
|
return output
|
|
|
|
|
|
def parse(macro, mapping, return_errors=False):
|
|
"""parse and generate a _Macro that can be run as often as you want.
|
|
|
|
If it could not be parsed, possibly due to syntax errors, will log the
|
|
error and return None.
|
|
|
|
Parameters
|
|
----------
|
|
macro : string
|
|
"r(3, k(a).w(10))"
|
|
"r(2, k(a).k(-)).k(b)"
|
|
"w(1000).m(Shift_L, r(2, k(a))).w(10, 20).k(b)"
|
|
mapping : Mapping
|
|
The preset object, needed for some config stuff
|
|
return_errors : bool
|
|
If True, returns errors as a string or None if parsing worked.
|
|
If False, returns the parsed macro.
|
|
"""
|
|
macro = handle_plus_syntax(macro)
|
|
|
|
# whitespaces, tabs, newlines and such don't serve a purpose. make
|
|
# the log output clearer and the parsing easier.
|
|
macro = re.sub(r'\s', '', macro)
|
|
|
|
if '"' in macro or "'" in macro:
|
|
logger.info('Quotation marks in macros are not needed')
|
|
macro = macro.replace('"', '').replace("'", '')
|
|
|
|
if return_errors:
|
|
logger.spam('checking the syntax of %s', macro)
|
|
else:
|
|
logger.spam('preparing macro %s for later execution', macro)
|
|
|
|
try:
|
|
macro_object = _parse_recurse(macro, mapping)
|
|
return macro_object if not return_errors else None
|
|
except Exception as error:
|
|
logger.error('Failed to parse macro "%s": %s', macro, error.__repr__())
|
|
# print the traceback in case this is a bug of key-mapper
|
|
logger.debug(''.join(traceback.format_tb(error.__traceback__)).strip())
|
|
return str(error) if return_errors else None
|