Simulating "Grave Escape" feature of QMK

keymap.rb

class Keyboard
  def grave_escape
    index = @keycodes.index(KEYCODE.index(:KC_ESCAPE).chr)
    if index
      if (@modifier & 0b00010001) > 0    # CTRL
        # Do nothing so that "SHIFT+CTRL+ESCAPE" opens Task Manager
      elsif (@modifier & 0b00100010) > 0 # SHIFT
        @keycodes[index] = KEYCODE.index(:KC_GRAVE).chr
      elsif (@modifier & 0b10001000) > 0 # GUI
        @keycodes[index] = KEYCODE.index(:KC_GRAVE).chr
        @modifier &= 0b01110111
        # However, this is going to send "releasing" of :KC_LGUI(:KC_RGUI)
        # then the Windows menu appears after all.
        # I don't know how QMK handles the problem :thinking_face:
      end
    end
  end

  # ## Replacing methods with const increases runtime performance
  # def grave_escape
  #   index = @keycodes.index(")") # KC_ESCAPE
  #   if index
  #     if (@modifier & 0b00010001) > 0
  #       # do nothing
  #     elsif (@modifier & 0b00100010) > 0
  #       @keycodes[index] = "5" # KC_GRAVE
  #     elsif (@modifier & 0b10001000) > 0
  #       @keycodes[index] = "5" # KC_GRAVE
  #       @modifier &= 0b01110111
  #     end
  #   end
  # end
end

puts "Example for meishi2"
kbd = Keyboard.new
kbd.init_pins(
  [ 6, 7 ],   # row0, row1
  [ 28, 27 ]  # col0, col1
)
kbd.add_layer :default, %i(
  KC_LSFT
  KC_LGUI
  KC_LCTL
  KC_ESCAPE
)
kbd.before_report { kbd.grave_escape }
kbd.start!