#!/bin/ksh

# set the video device via argument (if you put something stupid her, so be it...)
[ ! -z $1 ] && doas ln -sf /dev/video$1 /dev/video

# we need it a few times, and caching is faster
DUMP=$(dmesg)

# save the current active video device
_cur=$(ls -l /dev/video | sed  's/.*\(.$\)/\1/')

# starting from dev 4, you need to cd /dev && sh MAKEDEV videoX
for i in 0 1 2 3 4 5 6
do
    # find video attach and detach lines
    _input="$(echo "$DUMP" | grep -E "^video$i\ at.*|^video$i detached" | tail -n 1)"

    # if the last match is a detached line, stop here
    echo "$_input" | grep -q "detached" && continue

    # take the number from videoX, then grep for what's attached to find
    # the last description for this device (usb devices may change order
    # during runtime)

    _type=$(echo "$_input" | cut -d" " -f3)
    _number=$(echo "$_input" | cut -d" " -f1 | sed 's/[a-z]//g')
    _desc=$(echo "$DUMP" | grep -E "^$_type at.*" | tail -1 | cut -d'"' -f2)

    # Once we walked to the first non-existing device, we stop.
    [ -z $_number ] && exit 0

    # Show the device list and mark the current one
    if [ $_cur -eq $_number ]
    then
        echo "> $_number: $_desc"
    else
        echo "  $_number: $_desc"
    fi
done