Named tmux sessions

cl

#!/usr/bin/env bash

if ! command -v tmux &>/dev/null; then
    echo "tmux is not installed." >&2
    exit 1
fi

new_session() {
    read -rp "Session name (blank for auto): " name
    if [ -n "$TMUX" ]; then
        if [ -z "$name" ]; then
            tmux new-session -d
            tmux switch-client -l
        else
            tmux new-session -d -s "$name" && tmux switch-client -t "$name"
        fi
    else
        if [ -z "$name" ]; then
            tmux new-session
        else
            tmux new-session -s "$name"
        fi
    fi
}

attach_session() {
    local target="$1"
    if [ -n "$TMUX" ]; then
        tmux switch-client -t "$target"
    else
        tmux attach-session -t "$target"
    fi
}

sessions=$(tmux list-sessions 2>/dev/null)

if [ -z "$sessions" ]; then
    echo "No existing tmux sessions."
    echo ""
    new_session
    exit 0
fi

echo "Existing tmux sessions:"
echo ""

declare -a names
i=1
while IFS= read -r line; do
    printf "  %d) %s\n" "$i" "$line"
    names[$i]="${line%%:*}"
    ((i++))
done <<< "$sessions"

echo ""
echo "  n) New session"
echo "  q) Quit"
echo ""
read -rp "Choice: " choice

case "$choice" in
    q|Q) exit 0 ;;
    n|N) new_session ;;
    *)
        if [[ "$choice" =~ ^[0-9]+$ ]] && [ "$choice" -ge 1 ] && [ "$choice" -lt "$i" ]; then
            attach_session "${names[$choice]}"
        else
            echo "Invalid choice." >&2
            exit 1
        fi
        ;;
esac