Vim integration with tmux

tim

#!/bin/bash

filename="$1"
basename="$(basename $1)"
curpath="$(pwd)"
cd "$(dirname $filename)"
pid="$(vim -r 2>&1 | fgrep "$basename.sw" -A 5 | grep 'still running' | sed 's/[^0-9]//g')"
cd "$curpath"

if [ -n "$pid" ]; then
    tty="$(ps -p $pid -o tty h)"
    window="$(tmux list-panes -s -F '#{window_id} #{pane_tty}' | grep "$tty" | cut -d ' ' -f1)"
    tmux select-window -t "$window"
else
    old_window_name="$(tmux list-panes -F '#{window_name}')"
    tmux rename-window "_$basename"
    vim "$filename"
    tmux rename-window "$old_window_name"
fi