Helpers for `tmux` to make creating and re-attaching to sessions more sensible.

tmux.sh

# Usage examples:
#    Create a session and immediately attach to it:
#        tm mysess
#    Detach using the tmux prefix + D, as usual.
#    List sessions:
#        tl
#    Re-attach to mysess with the exact same line:
#        tm mysess
#    Kill a session without attaching:
#        tk mysess

# tmux wrapper to re-attach to a tmux session by name
#     If the session does not exist, it will be created.
#     If the session exists, the terminal will be re-attached.
#     If no session name is provided, the latest attached session is then re-attached.
function tm() {
    # if already in a tmux session, do nothing
    if [ -n "$TMUX" ]; then
        echo "Already in tmux session $TMUX"
        return
    fi
    # if no argument is provided, try to re-attach to the last session
    if [ -z "$1" ]; then
        # try to grab the name of the most recently created session
        TMUX_LAST_SESSION=$(tmux ls -F "#{session_created} #{session_name}: #{session_windows} windows (created #{t:session_created}){?session_grouped, (group ,}#{session_group}#{?session_grouped,),}#{?session_attached, (attached),}" 2>/dev/null | sort -Vr | sed 's/\S*\s//' | head -n 1 | awk '{print $1}')
        if [ -n "$TMUX_LAST_SESSION" ] && [[ $TMUX_LAST_SESSION != *"no server"* ]]; then
            echo "Re-attaching to last session: $TMUX_LAST_SESSION"
            tmux attach -t "$TMUX_LAST_SESSION"
            return
        fi
        echo "No tmux sessions found. Use: 'tm <SESSION_NAME>' to create a new one."
        return
    # if there is an argument, try to attach to it or create a session with that name
    else
        echo "Attaching to session $1..."
        tmux attach -t "$1" 2>/dev/null || (echo "Did not find session '$1', creating one..." && tmux new -s "$1")
        return
    fi
}

# prettier tmux ls
alias tl='tmux ls -F "?#{session_name}?#{session_windows} window(s)?cr. #{t:session_created} #{?session_grouped, ?group ,}#{session_group}#{?session_grouped,,} #{?session_attached, ?attached,}" | column -s ? -t -o " | "'

# kill a named session
alias tk='tmux kill-session -t'