nvim-tree.lua/lua/nvim-tree/explorer/common.lua

local M = {}

local function get_dir_git_status(parent_ignored, status, absolute_path)
  if parent_ignored then
    return "!!"
  end

  local file_status = status.files and status.files[absolute_path]
  if file_status then
    return file_status
  end

  return status.dirs and status.dirs[absolute_path]
end

local function get_git_status(parent_ignored, status, absolute_path)
  return parent_ignored and "!!" or status.files and status.files[absolute_path]
end

function M.has_one_child_folder(node)
  return #node.nodes == 1 and node.nodes[1].nodes and vim.loop.fs_access(node.nodes[1].absolute_path, "R")
end

function M.update_git_status(node, parent_ignored, status)
  -- status of the node's absolute path
  if node.nodes then
    node.git_status = get_dir_git_status(parent_ignored, status, node.absolute_path)
  else
    node.git_status = get_git_status(parent_ignored, status, node.absolute_path)
  end

  -- status of the link target, if the link itself is not dirty
  if node.link_to and not node.git_status then
    if node.nodes then
      node.git_status = get_dir_git_status(parent_ignored, status, node.link_to)
    else
      node.git_status = get_git_status(parent_ignored, status, node.link_to)
    end
  end
end

function M.shows_git_status(node)
  if not node.git_status then
    -- status doesn't exist
    return false
  elseif not node.nodes then
    -- status exist and is a file
    return true
  elseif not node.open then
    -- status exist, is a closed dir
    return M.config.git.show_on_dirs
  else
    -- status exist, is a open dir
    return M.config.git.show_on_dirs and M.config.git.show_on_open_dirs
  end
end

function M.node_destroy(node)
  if not node then
    return
  end

  if node.watcher then
    node.watcher:destroy()
  end
end

function M.setup(opts)
  M.config = {
    git = opts.git,
  }
end

return M