98 lines
3.3 KiB
Text
98 lines
3.3 KiB
Text
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#!/usr/bin/env python
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"""
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This script emulates "unique application" functionality on Linux. When starting
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playback with this script, it will try to reuse an already running instance of
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mpv (but only if that was started with umpv). Other mpv instances (not started
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by umpv) are ignored, and the script doesn't know about them.
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This only takes filenames as arguments. Custom options can't be used; the script
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interprets them as filenames. If mpv is already running, the files passed to
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umpv are appended to mpv's internal playlist. If a file does not exist or is
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otherwise not playable, mpv will skip the playlist entry when attempting to
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play it (from the GUI perspective, it's silently ignored).
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If mpv isn't running yet, this script will start mpv and let it control the
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current terminal. It will not write output to stdout/stderr, because this
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will typically just fill ~/.xsession-errors with garbage.
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mpv will terminate if there are no more files to play, and running the umpv
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script after that will start a new mpv instance.
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Note that you can control the mpv instance by writing to the command fifo:
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echo "cycle fullscreen" > ~/.umpv_fifo
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Note: you can supply custom mpv path and options with the MPV environment
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variable. The environment variable will be split on whitespace, and the
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first item is used as path to mpv binary and the rest is passed as options
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_if_ the script starts mpv. If mpv is not started by the script (i.e. mpv
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is already running), this will be ignored.
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"""
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import sys
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import os
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import errno
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import subprocess
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import fcntl
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import stat
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import string
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files = sys.argv[1:]
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# this is the same method mpv uses to decide this
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def is_url(filename):
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parts = filename.split("://", 1)
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if len(parts) < 2:
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return False
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# protocol prefix has no special characters => it's an URL
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allowed_symbols = string.ascii_letters + string.digits + '_'
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prefix = parts[0]
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return all(map(lambda c: c in allowed_symbols, prefix))
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# make them absolute; also makes them safe against interpretation as options
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def make_abs(filename):
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if not is_url(filename):
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return os.path.abspath(filename)
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return filename
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files = [make_abs(f) for f in files]
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FIFO = os.path.join(os.getenv("HOME"), ".umpv_fifo")
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fifo_fd = -1
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try:
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fifo_fd = os.open(FIFO, os.O_NONBLOCK | os.O_WRONLY)
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except OSError as e:
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if e.errno == errno.ENXIO:
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pass # pipe has no writer
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elif e.errno == errno.ENOENT:
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pass # doesn't exist
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else:
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raise e
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if fifo_fd >= 0:
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# Unhandled race condition: what if mpv is terminating right now?
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fcntl.fcntl(fifo_fd, fcntl.F_SETFL, 0) # set blocking mode
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fifo = os.fdopen(fifo_fd, "w")
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for f in files:
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# escape: \ \n "
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f = f.replace("\\", "\\\\").replace("\"", "\\\"").replace("\n", "\\n")
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f = "\"" + f + "\""
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fifo.write("raw loadfile " + f + " append\n")
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else:
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# Recreate pipe if it doesn't already exist.
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# Also makes sure it's safe, and no other user can create a bogus pipe
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# that breaks security.
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try:
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os.unlink(FIFO)
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except OSError as e:
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pass
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os.mkfifo(FIFO, 0o600)
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opts = (os.getenv("MPV") or "mpv").split()
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opts.extend(["--no-terminal", "--force-window", "--input-file=" + FIFO,
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"--"])
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opts.extend(files)
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subprocess.check_call(opts)
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