vampeta.sh

#!/usr/bin/env bash

if [[ "$OSTYPE" != "darwin"* ]]; then
  echo "macOS only. Sorry."
  exit 1
fi

function changeWallpaper() {
  osascript -e 'tell app "finder" to get posix path of (get desktop picture as alias)' > /tmp/old_wallpaper_path

  curl -s 'https://conteudo.imguol.com.br/2012/09/25/vampeta-fala-sobre-ensaio-nu-para-a-g-magazine-1348607286095_956x500.jpg' > /tmp/vampeta.jpg
  osascript -e 'tell application "System Events" to tell every desktop to set picture to "/tmp/vampeta.jpg"'
}

function revertWallpaper() {
  readonly local old_wallpaper_path=$(cat /tmp/old_wallpaper_path)
  osascript -e 'tell application "System Events" to tell every desktop to set picture to "'$old_wallpaper_path'"'
}

function paintItBlack() {
  osascript <<END
  tell application "System Preferences"
    reveal anchor 13 of pane id "com.apple.preference.universalaccess"
  end tell

  tell application "System Events"
    tell checkbox "Use grayscale" of group 1 of window "Accessibility" of application process "System Preferences"
      if value is 0 then click it
    end tell
    set value of slider "Cursor size:" of group 1 of window "Accessibility" of application process "System Preferences" to 4.0
    set value of slider "Display contrast:" of group 1 of window "Accessibility" of application process "System Preferences" to 1.0
  end tell
END
}

function colorize() {
  osascript <<END
  tell application "System Preferences"
    reveal anchor 13 of pane id "com.apple.preference.universalaccess"
  end tell

  tell application "System Events"
    tell checkbox "Use grayscale" of group 1 of window "Accessibility" of application process "System Preferences"
      if value is 1 then click it
    end tell
    set value of slider "Cursor size:" of group 1 of window "Accessibility" of application process "System Preferences" to 0.0
    set value of slider "Display contrast:" of group 1 of window "Accessibility" of application process "System Preferences" to 0.0
  end tell
END
}

if [ "${revert}" != "false" ]; then
  revertWallpaper
  colorize
else
  changeWallpaper
  paintItBlack
fi