#!/usr/bin/env bash
# Variables
#DRY=echo
DRY=
CLEAN=0

usage () {
    echo "Usage: $(basename $0) [-n] name"
    echo
    echo "-n - perform dry run, do nothing"
}

if [ $# -lt 1 ] ; then
    usage
    exit 1
fi

while [ $# -gt 0 ] ; do
    # Store how many options we have now
    OPTCOUNT=$#
    OPT=$1

    # Consume options if we recognise them
    if [ "$OPT" == "-n" ] ; then
        DRY=echo
        shift
    fi
    if [ "$OPT" == "-h" ] ; then
        usage
        exit 0
    fi
    if [ "$OPT" == "-l" ] ; then
        tmux ls
        exit $?
    fi

    # Bit of a hack, but it works.
    if [ $# == $OPTCOUNT ] ; then
        break
    fi
done

if [ "$TMUX" != "" ] ; then
    echo "You're already in a tmux session; detach first."
    exit 1
fi

TARGET=$1
shift
if [ "$TARGET" == "" ] ; then
    echo "You didn't specify a target."
    usage
    exit 1
fi

echo Looking for $TARGET

MATCHCOUNT=$(tmux ls | grep "$TARGET" | wc -l)
if [ $MATCHCOUNT -eq 0 ] ; then
  # Use the name as what they passed.
  SESSION_NAME="$TARGET"
  COMMAND="new -s $SESSION_NAME"
elif [ $MATCHCOUNT -gt 1 ] ; then
  found_multiple=1
  OLD_TARGET=$TARGET
  TARGET="^$OLD_TARGET:"
  MATCHCOUNT=$(tmux ls | grep "$TARGET" | wc -l)
  if [ $MATCHCOUNT -ne 1 ] ; then
    echo "Confused by session naming; $OLD_TARGET matches too many sessions."
    $DRY tmux ls | grep $OLD_TARGET
    exit 1
  fi
fi

if [ $MATCHCOUNT -eq 1 ] ; then
  MATCH=$(tmux ls | grep "$TARGET")
  # Pull out the existing session name.
  SESSION_NAME=$(echo "$MATCH" | sed -e 's/:.*$//')
  COMMAND="at -t $SESSION_NAME"
fi

if [ "$COMMAND" != "" ] ; then
    $DRY tmux $COMMAND
fi