[zsh function] manage tmux sessions

tmux-sessionizer.sh

function tm() (

	[ -z "$1" ] && echo 'Please give me the name of the session' && exit 1

	# If there is no tmux server running create the session
	[[ -z "$TMUX" && ! $(tmux ls 2> /dev/null) ]] && tmux new -s $1 && exit 0

	# There is at least a tmux server running
	# If you're not inside tmux either attach to the session or create it:
	[ -z "$TMUX" ] && tmux new -A -s $1 && exit 0
	
	# You're already inside tmux => [ -n "$TMUX" ] should be true
	# If session doesn't exist create it and then switch to it
	if ! tmux has -t $1 > /dev/null 2>&1; then 
		tmux new -d -s $1
	fi
	tmux switchc -t $1
)