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#!/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, the script will exit with code 1. This makes it possible
# to use the script like
#
# spawn-alacritty-cwd || alacritty
#
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
exit 1
fi
# Get first child of terminal
CHILD_PID=$(pgrep -P $PID)
if [[ "$PID" == "" ]]
then
exit 1
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
exit 1
fi
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