highlight.lua

-- Highlight the active buffer/view.
events.connect(events.INITIALIZED, function()
  local line_number_back =
    buffer.style_back[_SCINTILLA.constants.STYLE_LINENUMBER]
  local current_line_back = buffer.caret_line_back

  local function active()
    local buffer = buffer
    buffer.style_back[_SCINTILLA.constants.STYLE_LINENUMBER] = current_line_back
  end

  local function inactive()
    local buffer = buffer
    buffer.style_back[_SCINTILLA.constants.STYLE_LINENUMBER] = line_number_back
  end

  events.connect(events.VIEW_BEFORE_SWITCH, function() inactive() end)
  events.connect(events.VIEW_AFTER_SWITCH, function() active() end)
  events.connect(events.BUFFER_AFTER_SWITCH, function() active() end)
  events.connect(events.BUFFER_NEW, function() active() end)
  events.connect(events.FILE_OPENED, function() active() end)
  events.connect(events.RESET_AFTER, function() active() end)
end)