99 lines
3.0 KiB
Python
Executable File
99 lines
3.0 KiB
Python
Executable File
#!/usr/bin/python3
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from argparse import ArgumentParser
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from http.server import BaseHTTPRequestHandler, HTTPServer
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from os.path import dirname, join
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from subprocess import run, Popen, DEVNULL
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from threading import Thread, Event
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from time import time
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import json
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def main(matrix_delay_secs):
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workspaces = get_workspaces()
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visible = [ws for ws in workspaces if ws['visible']]
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with SubprocessServer(('', 0), len(visible)) as server:
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port = server.server_address[1]
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for ws in visible:
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overlay_matrix_on_workspace(ws['name'], port, matrix_delay_secs)
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run(['i3lock', '-n'], check=True)
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for pid_path in server.received_posts:
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assert pid_path.startswith('/'), pid_path
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try:
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pid = int(pid_path[1:])
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except ValueError:
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continue
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run(['kill', str(pid)])
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def get_workspaces():
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cp = run(
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['i3-msg', '-t', 'get_workspaces'],
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capture_output=True, check=True, text=True
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)
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return json.loads(cp.stdout)
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def overlay_matrix_on_workspace(ws_name, port, delay):
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run([
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'i3-msg',
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f'workspace {ws_name}; '
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# There may already be a full-screen app on that workspace.
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# This would prevent us from showing the Matrix full-screen.
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# So disable fullscreen first.
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f'fullscreen disable; '
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# --color-text=black to hide the cursor when there is a delay.
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f'exec "xfce4-terminal --hide-scrollbar --hide-menubar --fullscreen --color-text=black '
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# Send child PID to server so the parent can kill it, then show Matrix:
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f'-x bash -c \'curl -X POST localhost:{port}/$$ && sleep {delay} && cmatrix -b\'"'
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], check=True, stdout=DEVNULL)
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class SubprocessServer(HTTPServer):
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"""
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Process up to num_requests POST requests in up to timeout_secs seconds and
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store their paths in self.received_posts.
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"""
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def __init__(self, server_address, num_requests, timeout_secs=5):
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super().__init__(server_address, SubprocessHandler)
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self.received_posts = []
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self._num_requests = num_requests
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self._timeout_secs = timeout_secs
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self._thread = Thread(target=self._run_in_thread)
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self._started = Event()
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self._timeout_encountered = False
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def __enter__(self):
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result = super().__enter__()
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self._thread.start()
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self._started.wait()
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return result
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def __exit__(self, *args, **kwargs):
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self._thread.join()
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def _run_in_thread(self):
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self._started.set()
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end = time() + self._timeout_secs
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for _ in range(self._num_requests):
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time_remaining = end - time()
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if time_remaining < 0:
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break
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self.timeout = time_remaining
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self.handle_request()
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if self._timeout_encountered:
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break
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def handle_timeout(self):
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self._timeout_encountered = True
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class SubprocessHandler(BaseHTTPRequestHandler):
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def do_POST(self):
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self.server.received_posts.append(self.path)
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self.send_response(200)
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self.end_headers()
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def log_message(self, format, *args):
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return
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if __name__ == '__main__':
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parser = ArgumentParser(description='Alternative to i3lock that displays the Matrix')
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parser.add_argument(
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'delay', type=int, nargs='?', default=0,
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help='Seconds between blanking out the screen and starting the Matrix'
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)
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args = parser.parse_args()
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main(args.delay)
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