#!/bin/bash

# set vars
tags="$1" # all, busy
case $2 in
  +|next) dir="+";;
  -|prev) dir="-";;
esac
lobound=1; # first tag
hibound=9; # last tag

tagstat=$(herbstclient tag_status)

function checkbusy() {
  case "$tagstat" in
    *':'$next*) busy=1;;
    *)          busy=2;;
  esac
}
function checkbound() {
  if [ $next -gt $hibound ]; then
    next=$lobound;
  fi
  if [ $next -lt $lobound ]; then
    next=$hibound;
  fi
}

# get current tag
for t in {1..9}; do
  case "$tagstat" in
    *"#$t"*) curtag=$t;;
  esac
done

case $tags in
  "busy")
    # only switch to busy tags
    if [[ "$tagstat" == *':'* ]]; then
      busy=2
      next=$curtag
      while [ $busy != 1 ]; do
        next=$(($next $dir 1))
        checkbound
        checkbusy
      done
      herbstclient use $next
    else
      exit
    fi
  ;;
  "all")
    # switch between all tags
    next=$(($curtag $dir 1))
    checkbound
    herbstclient use $next
  ;;
  *)
    exit 1
  ;;
esac