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# Attach to existing tmux session rather than create a new one if possible
tmux() {
# If given any arguments, just use them as they are
if [ "$#" -gt 0 ] ; then
:
# If a session exists, just attach to it
elif command tmux has-session 2>/dev/null ; then
set -- attach-session -d
# Create a new session with an appropriate name
else
set -- new-session -s "${TMUX_SESSION:-default}"
fi
# Execute with concluded arguments
command tmux "$@"
}
# If we have a SHLVL set from one of the shells that does that (bash, ksh93,
# zsh), then set a SHLVL-derived value that takes tmux into account if we
# haven't already. This can be used to show the current SHLVL in the prompt for
# more advanced shells.
if [ -n "$SHLVL" ] && [ -n "$TMUX" ] && [ -z "$TMUX_SHLVL" ] ; then
TMUX_SHLVL=$((SHLVL - 1))
export TMUX_SHLVL
fi
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