def setup_tmux_hooks():
"""Registers tmux hooks which are
required to notice a change in the visibility
of the pane this program runs in.
Also it's required to notice new tmux clients
displaying our pane.
Returns:
function which unregisters the registered hooks
"""
events = (
'client-session-changed',
'session-window-changed',
'pane-mode-changed',
'client-detached'
)
lock_directory_path = pathlib.PosixPath(tempfile.gettempdir()) / 'ueberzug'
lock_file_path = lock_directory_path / tmux_util.get_session_id()
own_pid = str(os.getpid())
command_template = 'ueberzug query_windows '
try:
lock_directory_path.mkdir()
except FileExistsError:
pass
def update_hooks(pid_file, pids):
pids = ' '.join(pids)
command = command_template + pids
pid_file.seek(0)
pid_file.truncate()
pid_file.write(pids)
pid_file.flush()
for event in events:
if pids:
tmux_util.register_hook(event, command)
else:
tmux_util.unregister_hook(event)
def remove_hooks():
"""Removes the hooks registered by the outer function."""
with files.lock(lock_file_path) as lock_file:
pids = set(lock_file.read().split())
pids.discard(own_pid)
update_hooks(lock_file, pids)
with files.lock(lock_file_path) as lock_file:
pids = set(lock_file.read().split())
pids.add(own_pid)
update_hooks(lock_file, pids)
return remove_hooks
def remove_hooks():
"""Removes the hooks registered by the outer function."""
with files.lock(lock_file_path) as lock_file:
pids = set(lock_file.read().split())
pids.discard(own_pid)
update_hooks(lock_file, pids)