Script to get the CWD of the current active window, with support for shells running tmux. This can be used to launch new terminals in the same cwd as the current one.

getCurrentWindowCWD.sh

#!/bin/bash
# i3 thread: https://faq.i3wm.org/question/150/how-to-launch-a-terminal-from-here/?answer=152#post-id-152
# Inspired by https://gist.github.com/viking/5851049 but with support for tmux

CWD=''

# Get window ID
ID=$(xdpyinfo | grep focus | cut -f4 -d " ")

# Get PID of process whose window this is
PID=$(xprop -id $ID | grep -m 1 PID | cut -d " " -f 3)

# Get last child process (shell, vim, etc)
if [ -n "$PID" ]; then
	TREE=$(pstree -lpA $PID | tail -n 1)
	PROCESS=$(echo $TREE | awk -F'---' '{print $NF}')
	PID=$(echo $TREE | awk -F'---' '{print $NF}' | sed -re 's/[^0-9]//g')
	# If we're in a tmux session then we need to do some gymnastics to get the
	# cwd since the tmux session is not a direct child of the terminal
	if [[ $PROCESS == tmux* ]];
	then
		# To get the pid of the actual process we:
		# - find the pts of the tmux process found above
		PTS=$(ps -ef | grep $PID | grep -v grep | awk '{print $6}');
		# - find the tmux session that's attached to the pts
		TMUX_SESSION=$(tmux lsc -t /dev/${PTS} -F "#{client_session}")
		# - find the pane_pid of the session
		PID=$(tmux list-panes -st $TMUX_SESSION	-F '#{pane_pid}')
	fi

	# If we find the working directory, run the command in that directory
	if [ -e "/proc/$PID/cwd" ]; then
		CWD=$(readlink /proc/$PID/cwd)
	fi
fi
echo $CWD