Using external source for diff -- vim-gitgutter

[rouge8]

Posting this for possible inclusion on the wiki:

local function vim_gitgutter_diff_source()
  local added, modified, removed = unpack(vim.fn.GitGutterGetHunkSummary())
  return {
    added = added,
    modified = modified,
    removed = removed,
  }
end

require'lualine'.setup {
  sections = {
    lualine_b = { {'diff', source = vim_gitgutter_diff_source}, },
  }
}

[shadmansaleh]

Looks like a good addition I'll add it to wiki..