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#!/usr/bin/env sh
# A script to run a command in a tmux session of choice.
# The first argument is the session name. If empty the user uses dmenu to choose.
# If the session is already attached, the window is activated.
# Else a new terminal is opened attaching the session.
# The default terminal is st.
TERMINAL="${TERMINAL:-st}"
# If the first argument is empty use dmenu to obtain a session name.
if [ -n "$1" ]; then chosen="$1"
else chosen="$(tmux ls -F '#{session_name}' | dmenu -p "Choose which tmux session to use")"
fi
# If no session was chosen then exit, else remove session_name from arg list.
if [ -z "$chosen" ]; then exit; fi
shift
# If the session doesn't exist yet, create it running the provided program.
if ! tmux has-session -t "$chosen" 2> /dev/null
then exec $TERMINAL -T "tmux: $chosen" zshrc tmux new -s "$chosen" -- "$@"
fi
# As the session exists, create a new window to run the program.
tmux neww -t "$chosen": -- "$@"
# Obtain the pid of the client running the target session. If it exists activate the window.
# Else attach the session to a new terminal.
client_pid="$(tmux lsc -F '#{session_name}:#{client_pid}' | session="$chosen" awk -F : '{ if ($1 == ENVIRON["session"]) print $2 }')"
if [ -n "$client_pid" ]
then xdotool windowactivate "$(xdotool search --pid "$(ps -o ppid= "$client_pid")")"
else exec $TERMINAL -T "tmux: $chosen" zshrc tmux attach -t "$chosen"
fi
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