#!/bin/bash

get_new_display()
{
    for ((n=1; n<99; ++n))
    do
        if [ ! -e /tmp/.X$n-lock ]
        then
            NEW_DISPLAY=:$n
            return
        fi
    done
    false
}

get_new_display || exit

if [ $# = 0 ]
then
    set -- firestart
fi

# TITLE=$* # lol, startx doesn't support arguments with spaces
TITLE=$1
TITLE= # blank title documents the screen grab keys in the title

if [ "$1" != firestart ]
then
    USE_XINIT=y
fi

if [ "$USE_XINIT" ]
then
    set -x
    case "$1" in
        /*) ;;
        *) f1=$(which "$1") || exit
           shift
           set -- "$f1" "$@"
           ;;
    esac
    xinit "$@" -- $(which Xephyr) "$NEW_DISPLAY" -resizeable -p 0 -terminate ${TITLE:+ -title "$TITLE"}
else
    set -x
    dpi=$(xrdb -query | sed -n -e 's/^Xft.dpi:[ \t]*//p')
    startx -- "$(which Xephyr)" "$NEW_DISPLAY" \
      -resizeable \
      -p 0 \
      -terminate \
      ${TITLE:+ -title "$TITLE"} \
      ${dpi:+ -dpi "$dpi"} \
      &
    if [ $# -gt 0 ]
    then
        DISPLAY=$NEW_DISPLAY "$@" &
    fi
    wait
fi