umpv: Update to work with new mpv version

Moved umpv script to updated version available here:
eeb711f5f3/TOOLS/umpv

Switches deprecated `--input-file` argument for `--input-ipc-server`,
making use of socket instead of FIFO file ---
though it should work the same in practice.

mpv/.local/bin/umpv

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 This script emulates "unique application" functionality on Linux. When starting
@@ -19,10 +19,6 @@ will typically just fill ~/.xsession-errors with garbage.
 mpv will terminate if there are no more files to play, and running the umpv
 script after that will start a new mpv instance.
 
-Note that you can control the mpv instance by writing to the command fifo:
-
-    echo "cycle fullscreen" > ~/.umpv_fifo
-
 Note: you can supply custom mpv path and options with the MPV environment
       variable. The environment variable will be split on whitespace, and the
       first item is used as path to mpv binary and the rest is passed as options
@@ -32,6 +28,7 @@ Note: you can supply custom mpv path and options with the MPV environment
 
 import sys
 import os
+import socket
 import errno
 import subprocess
 import fcntl
@@ -57,47 +54,42 @@ def make_abs(filename):
     return filename
 files = [make_abs(f) for f in files]
 
-FIFO = os.path.join(os.getenv("HOME"), ".umpv_fifo")
+SOCK = os.path.join(os.getenv("HOME"), ".umpv_socket")
 
-fifo_fd = -1
+sock = None
 try:
-    fifo_fd = os.open(FIFO, os.O_NONBLOCK | os.O_WRONLY)
+    sock = socket.socket(socket.AF_UNIX)
-except OSError as e:
+    sock.connect(SOCK)
-    if e.errno == errno.ENXIO:
+except socket.error as e:
-        pass  # pipe has no writer
+    if e.errno == errno.ECONNREFUSED:
+        sock = None
+        pass  # abandoned socket
     elif e.errno == errno.ENOENT:
+        sock = None
         pass # doesn't exist
     else:
         raise e
 
-if fifo_fd >= 0:
+if sock:
     # Unhandled race condition: what if mpv is terminating right now?
-    fcntl.fcntl(fifo_fd, fcntl.F_SETFL, 0) # set blocking mode
-    fifo = os.fdopen(fifo_fd, "w")
     for f in files:
         # escape: \ \n "
         f = f.replace("\\", "\\\\").replace("\"", "\\\"").replace("\n", "\\n")
         f = "\"" + f + "\""
-        fifo.write("raw loadfile " + f + " append\n")
+        sock.send(("raw loadfile " + f + " append\n").encode("utf-8"))
 else:
-    # Recreate pipe if it doesn't already exist.
+    # Let mpv recreate socket if it doesn't already exist.
-    # Also makes sure it's safe, and no other user can create a bogus pipe
-    # that breaks security.
-    try:
-        os.unlink(FIFO)
-    except OSError as e:
-        pass
-    os.mkfifo(FIFO, 0o600)
 
     opts = (os.getenv("MPV") or "mpv").split()
     opts.extend(["--no-terminal",
-                 "--on-all-workspaces",
+                 "--force-window",
+                 "--input-ipc-server=" + SOCK,
                  # position on lower left screen corner
                  # contains funky fix for slight resizings depending on video
                  # move it 10px more left than it wants; 5px more up
                  "--geometry=15%+-10-+5",
+                 "--on-all-workspaces",
                  "--force-window=immediate",
-                 "--input-file=" + FIFO,
                  "--"])
     opts.extend(files)