Transparent lock screen

lock-transparent.sh

#!/usr/bin/env bash
# Rico's transparent X lock script
# Requires 'scrot' and 'xbacklight' and 'i3lock'

_xbacklight () {
  if which xbacklight &>/dev/null; then
    xbacklight $*
  fi
}

# Config
BACKLIGHT_LEVEL=2

temp_image=$(mktemp --suffix='.jpg')
light_level=$(xbacklight -get)

if which scrot &>/dev/null; then
  # Take a screenshot
  scrot "$temp_image"

  # Dim the screen
  _xbacklight -set $BACKLIGHT_LEVEL

  # Open i3lock with the screenshot image
  i3lock \
    --nofork \
    --ignore-empty-password \
    --show-failed-attempts \
    -i "$temp_image"

  # After unlocking, remove the image
  rm "$temp_image"
else
  # If scrot is not installed, use a flat color
  _xbacklight -set $BACKLIGHT_LEVEL
  i3lock -c 112233
fi

# Restore old light color
_xbacklight -set $light_level