lock

#! /bin/bash

LOGO=`dirname $0`/arch-logo.png
IMG=/tmp/screen_locked.png
PARTS=/tmp/lock_parts_
PART1=${PARTS}0.jpg
PART2=${PARTS}1.jpg

# colors of the circle
NORMAL_COLOR="#005fd7"
SUCCESS_COLOR="#00ff5f"
FAILURE_COLOR="#d70000"

if [ "$1" = "--help" ] || [ "$1" = "-h" ] || [ "$1" = "help" ]; then
  cat << EOF
$ lock
Lock screen

Using an i3lock fork: https://github.com/Lixxia/i3lock
EOF
  exit
fi

hash scrot magick i3lock || exit 127

# take a screenshot
scrot -o $IMG

add_logo_user() {
  # add small arch logo to screen center
  # magick $1 $LOGO -gravity center -geometry +0-10 -composite $1

  # add user@hostname above the logo
  magick $1 -font Comic-Code-Ligatures-Bold-Nerd-Font-Complete -fill grey -pointsize 22 -gravity center -draw "text 0,-150 '$USER@$(cat /etc/hostname)'" $1
  ## list of fonts: identify -list font
}

process_image() {
  # blur logo, to give it a glow
  add_logo_user $1

  # blur screenshot
  magick $1 -blur 0x6 $1
  ## see for customizing blur: https://www.imagemagick.org/Usage/blur/#blur_args

  # clear logo over the blur
  add_logo_user $1
}

if [ "$(xrandr --listmonitors | head -n1 | awk '{ print $2 }')" -ge 2 ]; then # 2 monitors
  magick $IMG -crop 2x1@ $PARTS%d.jpg

  process_image $PART1
  process_image $PART2

  magick $PARTS*.jpg +append $IMG
else
  process_image $IMG
fi

wait_fingerprint() {
  while pidof i3lock >/dev/null; do
    if (timeout 5 fprintd-verify | grep -q verify-match); then
      pkill i3lock
    fi
  done
}

# copied from the conversation here: https://github.com/i3/i3lock/issues/210#issuecomment-1047552957
if [[ -e /dev/fd/${XSS_SLEEP_LOCK_FD:--1} ]]; then
  kill_i3lock() {
    pkill -xu $EUID "$@" i3lock
  }

  trap kill_i3lock TERM INT

  # we have to make sure the locker does not inherit a copy of the lock fd
  i3lock -i $IMG --ignore-empty-password --24 -o "$SUCCESS_COLOR" -w "$FAILURE_COLOR" -l "$NORMAL_COLOR" {XSS_SLEEP_LOCK_FD}<&-

  # now close our fd (only remaining copy) to indicate we're ready to sleep
  exec {XSS_SLEEP_LOCK_FD}<&-

  wait_fingerprint
else
  trap 'kill %%' TERM INT
  i3lock -ni $IMG --ignore-empty-password --24 -o "$SUCCESS_COLOR" -w "$FAILURE_COLOR" -l "$NORMAL_COLOR" &
  wait_fingerprint
fi