Creates new (or attaches to existing) tmux sessions using an '.icon' file. This script can be called from inside or outside of tmux

tmux-named-sessions.sh

#!/bin/bash
#
# SPDX-License-Identifier: MIT
# Copyright © 2021 Apolo Pena
#
# tmux-named-sessions.sh
# Description:
# Creates new tmux sessions using an '.icon' file
# The .icon file is an text file next to this script with an emoji in it
# This script can be called from inside or outside of tmux
# If a session does not exist a new one will be created
# If a session already exists then that session will be attached
#

icon_root=$(dirname "$(realpath "$0")")

setSession() {
  default_icon="🖥️"
  icon="$icon_root/.icon-$1"
  if [[ -f $icon ]]; then
      icon=$(cat "$icon")
  else
      echo -e "Could not find an .icon file in $icon, using the default icon $default_icon️️️"
      icon="$default_icon"
  fi
  session="session $icon"
}

setSession "$1"

if [[ -z $TMUX ]]; then
    if tmux has-session -t "$session" 2>/dev/null; then
      echo "Attaching to $session"
      tmux attach-session -d -t "$session"
    else
      echo "Creating new $session"
      tmux new-session -s "$session"
    fi
else
  # We're inside Tmux, create a new session if it does not exist
  sesh="$(tmux ls | grep "$session")"
  if [[ -z $sesh ]]; then
      tmux new -s "$session" -d
  fi
  # Switch to the session if we are not already in it
  if [[ $(tmux display-message -p "#S") != "$session" ]]; then
    tmux switch-client -t "$session"
  fi
fi