(i3) add script to spawn alacritty in cwd

i3/alacritty.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+# Spawn a new instance of Alacritty using the CWD of the currently focused
+# Alacritty process.
+#
+# This is useful in environment like i3 where terminals are opened using a
+# key-combination while another terminal is already focused.
+#
+# If the script is run with a non-Alacritty window in focus or a non-compliant
+# version of Alacritty, an instance will be spawned in the user's $HOME.
+
+ACTIVE_WINDOW=$(xdotool getactivewindow)
+ACTIVE_WM_CLASS=$(xprop -id $ACTIVE_WINDOW | grep WM_CLASS)
+if [[ $ACTIVE_WM_CLASS == *"Alacritty"* ]]
+then
+    # Get PID. If _NET_WM_PID isn't set, bail.
+    PID=$(xprop -id $ACTIVE_WINDOW | grep _NET_WM_PID | grep -oP "\d+")
+    if [[ "$PID" == "" ]]
+    then
+        alacritty
+    fi
+    # Get first child of terminal
+    CHILD_PID=$(pgrep -P $PID)
+    if [[ "$PID" == "" ]]
+    then
+        alacritty
+    fi
+    # Get current directory of child. The first child should be the shell.
+    pushd "/proc/${CHILD_PID}/cwd"
+    SHELL_CWD=$(pwd -P)
+    popd
+    # Start alacritty with the working directory
+    alacritty --working-directory $SHELL_CWD
+else
+    alacritty
+fi

i3/config

@@ -67,7 +67,7 @@ tiling_drag modifier titlebar
 bindsym $mod+B exec $default_browser
 
 # start a terminal
-bindsym $mod+T exec alacritty
+bindsym $mod+T exec --no-startup-id ~/.config/i3/alacritty.sh
 
 # start discord on workspace 3
 #bindsym $mod+C exec discord