Moved mpv sockets to the user runtime folder defined in `XDG_RUNTIME_DIR` with a fallback to `/tmp`, also added a lua script to properly handle env variables in the mpv config for the `input-ipc-server` property

i3/.config/i3/scripts/webcam-toggle.sh

@@ -2,7 +2,7 @@
 
 pkill -f /dev/video || \
     mpv --title="mpv-floating-window" \
-        --input-ipc-server="$HOME/.cache/mpvsocket-webcam" \
+        --no-config \
         --no-osc \
         --no-input-default-bindings \
         --input-conf=/dev/null \

mpv/.config/mpv/mpv.conf

@@ -15,7 +15,8 @@ hwdec=vaapi
 [default]
 
 # In order to communicate to the Polybar's mpv module
-input-ipc-server=~/.cache/mpvsocket
+#input-ipc-server=${XDG_RUNTIME_DIR:-/tmp/$(id -u)-runtime}/mpv/main.sock
+script-opts=input-ipc-server="${XDG_RUNTIME_DIR:-/tmp/$(id -u)-runtime}/mpv/main.sock"
 
 save-position-on-quit
 

mpv/.config/mpv/scripts/set_input-ipc-server.lua

@@ -0,0 +1,40 @@
+
+--[[--
+  @script input-ipc-server-plus
+  @author Meliurwen
+  @license GPLv3
+  This script makes possible the use of environment variables for the
+  `input-ipc-server` property in the config file.
+
+  The script triggers if and only if no `input-ipc-server` is set and the
+  homonymous `input-ipc-server` option in `script-opts` is set in its place.
+
+  A typical use case is to set the path with the env variable XDG_RUNTIME_DIR
+  and a respective fallback path like this:
+
+  @usage script-opts=input-ipc-server="${XDG_RUNTIME_DIR:-/tmp/$(id -u)-runtime}/mpv/main.sock"
+
+  It's worth to note that it's possible to include subshells in order to compute
+  part (or the whole) path. A typical use case, like in the just showed example
+  is to stick to POSIX standards, using `$(id -u)` instead of `$USER`.
+]]
+
+local function isempty(s)
+  return s == nil or s == ""
+end
+
+local function os_cmd_return(command)
+  local handle = io.popen(command)
+  local result = handle:read("*a")
+  handle:close()
+  return string.format(result:match("^%s*(.+)"))
+end
+
+local ipc_opt_par = mp.get_property("input-ipc-server")
+local ipc_opt_raw = mp.get_opt("input-ipc-server")
+if isempty(ipc_opt_par) and not isempty(ipc_opt_raw) then
+  local ipc_opt_fullpath = os_cmd_return('printf "%s" ' .. ipc_opt_raw)
+  local ipc_opt_dirpath = os_cmd_return("dirname " .. ipc_opt_fullpath)
+  os.execute("mkdir -p " .. ipc_opt_dirpath)
+  mp.set_property("input-ipc-server", ipc_opt_fullpath)
+end

polybar/.config/polybar/config

@@ -264,7 +264,7 @@ interval = 1
 format =  <label>
 label = %output%
 
-click-left = printf "%s\n" "cycle pause" | socat - ~/.cache/mpvsocket
+click-left = printf "%s\n" "cycle pause" | socat - $XDG_RUNTIME_DIR/mpv/main.sock
 
 
 [module/bluetooth]

polybar/.config/polybar/scripts/mpv.sh

@@ -3,9 +3,9 @@
 # Note: In order to use this script you have to tell to mpv to enable a socket.
 #       Two ways are possible to achieve this:
 #       1) Use the argument --input-ipc-server when you launch it. For example:
-#          `mpv --input-ipc-server=~/.cache/mpvsocket Your.Video.File.mkv`
+#          `mpv --input-ipc-server=mpvsocket Your.Video.File.mkv`
 #       2) Add the line below when in the `mpv.conf` file:
-#          `input-ipc-server=~/.cache/mpvsocket`
+#          `input-ipc-server=mpvsocket`
 
 time_to_human(){
     if [ "$API_OUTPUT" -gt 3600 ]; then
@@ -19,7 +19,7 @@ time_to_human(){
     fi
 }
 
-MPV_SOCKET_PATH="$HOME/.cache/mpvsocket"
+MPV_SOCKET_PATH="${XDG_RUNTIME_DIR:-/tmp/$(id -u)-runtime}/mpv/main.sock"
 
 OUTPUT=""