Open multiple tmux sessions connected to the same set of windows

tmux-named

#!/bin/bash

# We need tmux. Obvs.
if [[ -z `which tmux` ]]; then echo "You need tmux first!"; exit 1; fi

# Named variables are much more flexible
name="$1"

# Make sure we got a session name to create or join
[[ -n "$name" ]] || { echo "Usage: tmux-named [SESSION_NAME]"; exit; }

# Make sure we can run homebrewed tmux
if [[ $PATH != */usr/local/bin* ]]; then export PATH=$PATH:/usr/local/bin; fi

# Make sure there is a 'name' session
tmux has -t "$name" 2> /dev/null || tmux new -d -s "$name"

# Calculate the number of the next session
session_number=$(tmux ls -F "#S" | grep "^$name" | wc -l | sed "s/^[ ]*//")
session_name="${name} $session_number"

echo $session_name

# If this session already exists, a lower number must be missing
while tmux has -t "$session_name" 2> /dev/null; do
  let session_number--
  session_name="${name} $session_number"
done

echo $session_name

# Create the new session
tmux new-session -d -t "$name" -s "$session_name"

# Tell this session to die when the window containing it is closed
die="set-option -q -t $session_name destroy-unattached on"

if [ -z $TMUX ]; then
  # Join the new and configured session
  tmux $die \; attach-session -t "$session_name"
else
  # Switch this tmux client to the new session
  tmux $die \; switch-client -t "$session_name"
fi