Create and switch sessions in tmux quickly

tm.sh

#!/bin/sh
tm() {
  if [ -z $1 ]; then
    tmux switch-client -l
  else
    if [ -z "$TMUX" ]; then
      tmux new-session -As $1
    else
      if ! tmux has-session -t $1 2>/dev/null; then
        TMUX= tmux new-session -ds $1
      fi
      tmux switch-client -t $1
    fi
  fi
}

tm $1

tm_tab_complete.bash

# tmux session tab complete function
_tmux_complete_session() {
  local IFS=$'\n'
  local cur=${COMP_WORDS[COMP_CWORD]}
  COMPREPLY=( ${COMPREPLY[@]:-} $(compgen -W "$(tmux -q list-sessions | cut -f 1 -d ':')" -- "${cur}") )
}
complete -F _tmux_complete_session tm

tmux.conf

# Toggle between the last two sessions
bind m switch-client -l
bind M command-prompt -p 'switch session:' "run \"tm '%%'\""