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124 lines
3.7 KiB
124 lines
3.7 KiB
#-----------------------------------------------------------------------------
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# Copyright (C) 2019 Alberto Sottile
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#
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# Distributed under the terms of the 3-clause BSD License.
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#-----------------------------------------------------------------------------
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import ctypes
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import ctypes.util
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import subprocess
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import sys
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import os
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from pathlib import Path
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from typing import Callable
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try:
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from Foundation import NSObject, NSKeyValueObservingOptionNew, NSKeyValueChangeNewKey, NSUserDefaults
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from PyObjCTools import AppHelper
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_can_listen = True
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except ModuleNotFoundError:
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_can_listen = False
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try:
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# macOS Big Sur+ use "a built-in dynamic linker cache of all system-provided libraries"
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appkit = ctypes.cdll.LoadLibrary('AppKit.framework/AppKit')
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objc = ctypes.cdll.LoadLibrary('libobjc.dylib')
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except OSError:
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# revert to full path for older OS versions and hardened programs
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appkit = ctypes.cdll.LoadLibrary(ctypes.util.find_library('AppKit'))
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objc = ctypes.cdll.LoadLibrary(ctypes.util.find_library('objc'))
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void_p = ctypes.c_void_p
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ull = ctypes.c_uint64
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objc.objc_getClass.restype = void_p
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objc.sel_registerName.restype = void_p
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# See https://docs.python.org/3/library/ctypes.html#function-prototypes for arguments description
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MSGPROTOTYPE = ctypes.CFUNCTYPE(void_p, void_p, void_p, void_p)
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msg = MSGPROTOTYPE(('objc_msgSend', objc), ((1 ,'', None), (1, '', None), (1, '', None)))
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def _utf8(s):
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if not isinstance(s, bytes):
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s = s.encode('utf8')
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return s
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def n(name):
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return objc.sel_registerName(_utf8(name))
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def C(classname):
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return objc.objc_getClass(_utf8(classname))
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def theme():
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NSAutoreleasePool = objc.objc_getClass('NSAutoreleasePool')
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pool = msg(NSAutoreleasePool, n('alloc'))
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pool = msg(pool, n('init'))
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NSUserDefaults = C('NSUserDefaults')
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stdUserDef = msg(NSUserDefaults, n('standardUserDefaults'))
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NSString = C('NSString')
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key = msg(NSString, n("stringWithUTF8String:"), _utf8('AppleInterfaceStyle'))
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appearanceNS = msg(stdUserDef, n('stringForKey:'), void_p(key))
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appearanceC = msg(appearanceNS, n('UTF8String'))
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if appearanceC is not None:
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out = ctypes.string_at(appearanceC)
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else:
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out = None
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msg(pool, n('release'))
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if out is not None:
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return out.decode('utf-8')
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else:
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return 'Light'
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def isDark():
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return theme() == 'Dark'
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def isLight():
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return theme() == 'Light'
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def _listen_child():
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"""
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Run by a child process, install an observer and print theme on change
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"""
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import signal
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signal.signal(signal.SIGINT, signal.SIG_IGN)
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OBSERVED_KEY = "AppleInterfaceStyle"
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class Observer(NSObject):
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def observeValueForKeyPath_ofObject_change_context_(
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self, path, object, changeDescription, context
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):
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result = changeDescription[NSKeyValueChangeNewKey]
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try:
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print(f"{'Light' if result is None else result}", flush=True)
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except IOError:
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os._exit(1)
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observer = Observer.new() # Keep a reference alive after installing
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defaults = NSUserDefaults.standardUserDefaults()
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defaults.addObserver_forKeyPath_options_context_(
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observer, OBSERVED_KEY, NSKeyValueObservingOptionNew, 0
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)
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AppHelper.runConsoleEventLoop()
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def listener(callback: Callable[[str], None]) -> None:
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if not _can_listen:
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raise NotImplementedError()
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with subprocess.Popen(
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(sys.executable, "-c", "import _mac_detect as m; m._listen_child()"),
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stdout=subprocess.PIPE,
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universal_newlines=True,
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cwd=Path(__file__).parent,
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) as p:
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for line in p.stdout:
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callback(line.strip())
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