#!/bin/bash

# omarchy:summary=Returns true when a fingerprint reader is present
# omarchy:hidden=true

# Detect straight from sysfs so this works before fprintd/usbutils are
# installed (the fingerprint setup pulls those in). USB vendor IDs listed here
# ship fingerprint readers; multi-purpose vendors (e.g. Elan/STMicro, which
# also make USB touchscreens) are left out to avoid nagging laptops with no
# reader — those still match on the product string below when present.
fingerprint_vendors=" 27c6 138a 06cb 08ff 1c7a 147e "

# libfprint drives every reader it supports from userspace over libusb, so a
# real reader sits there with no kernel driver bound to any of its interfaces.
# The other things these vendors build — Synaptics webcam bridges (usbio-bridge
# on the Dell XPS 14), touchpads and touchscreens (usbhid), cameras (uvcvideo)
# — all bind one. Only the vendor-ID guess needs this; a device that names
# itself a fingerprint reader is trusted outright.
has_kernel_driver() {
  local intf
  for intf in "$1"/*:*; do
    [[ -e $intf/driver ]] && return 0
  done
  return 1
}

for dev in /sys/bus/usb/devices/*; do
  # The device's own product descriptor usually names it, e.g. "Goodix
  # Fingerprint USB Device" — driver-independent and vendor-agnostic.
  if [[ -r $dev/product ]]; then
    product=$(<"$dev/product")
    product=${product,,}
    [[ $product == *fingerprint* || $product == *biometric* ]] && exit 0
  fi

  if [[ -r $dev/idVendor ]]; then
    vendor=$(<"$dev/idVendor")
    [[ $fingerprint_vendors == *" $vendor "* ]] &&
      ! has_kernel_driver "$dev" && exit 0
  fi
done

exit 1