add classic, migrating nodes classes

lua/nvim-tree/classic.lua

@@ -0,0 +1,77 @@
+--
+-- classic
+--
+-- Copyright (c) 2014, rxi
+--
+-- This module is free software; you can redistribute it and/or modify it under
+-- the terms of the MIT license. See LICENSE for details.
+--
+
+
+local Object = {}
+Object.__index = Object
+
+
+function Object:new()
+end
+
+
+function Object:extend()
+  local cls = {}
+  for k, v in pairs(self) do
+    if k:find("__") == 1 then
+      cls[k] = v
+    end
+  end
+  cls.__index = cls
+  cls.super = self
+  setmetatable(cls, self)
+  return cls
+end
+
+
+function Object:implement(...)
+  for _, cls in pairs({...}) do
+    for k, v in pairs(cls) do
+      if self[k] == nil and type(v) == "function" then
+        self[k] = v
+      end
+    end
+  end
+end
+
+
+function Object:is(T)
+  local mt = getmetatable(self)
+  while mt do
+    if mt == T then
+      return true
+    end
+    mt = getmetatable(mt)
+  end
+  return false
+end
+
+
+---Return object if it is an instance of class, otherwise nil
+---@generic T
+---@param cls T
+---@return T|nil
+function Object:as(cls)
+  return self:is(cls) and self or nil
+end
+
+
+function Object:__tostring()
+  return "Object"
+end
+
+
+function Object:__call(...)
+  local obj = setmetatable({}, self)
+  obj:new(...)
+  return obj
+end
+
+
+return Object

lua/nvim-tree/core.lua

@@ -1,4 +1,5 @@
 local events = require("nvim-tree.events")
+local notify = require("nvim-tree.notify")
 local view = require("nvim-tree.view")
 local log = require("nvim-tree.log")
 
@@ -15,7 +16,21 @@ function M.init(foldername)
   if TreeExplorer then
     TreeExplorer:destroy()
   end
-  TreeExplorer = require("nvim-tree.explorer"):create(foldername)
+
+  local err, path
+
+  if foldername then
+    path, err = vim.loop.fs_realpath(foldername)
+  else
+    path, err = vim.loop.cwd()
+  end
+  if path then
+    TreeExplorer = require("nvim-tree.explorer")(path)
+  else
+    notify.error(err)
+    TreeExplorer = nil
+  end
+
   if not first_init_done then
     events._dispatch_ready()
     first_init_done = true

lua/nvim-tree/explorer/init.lua

@@ -3,7 +3,6 @@ local buffers = require("nvim-tree.buffers")
 local core = require("nvim-tree.core")
 local git = require("nvim-tree.git")
 local log = require("nvim-tree.log")
-local notify = require("nvim-tree.notify")
 local utils = require("nvim-tree.utils")
 local view = require("nvim-tree.view")
 local node_factory = require("nvim-tree.node.factory")
@@ -36,51 +35,28 @@ local config
 ---@field sorters Sorter
 ---@field marks Marks
 ---@field clipboard Clipboard
-local Explorer = RootNode:new()
+local Explorer = RootNode:extend()
 
----Static factory method
----@param path string?
----@return Explorer?
-function Explorer:create(path)
-  local err
+---@param path string
+function Explorer:new(path)
+  Explorer.super.new(self, self, path, "..", nil)
 
-  if path then
-    path, err = vim.loop.fs_realpath(path)
-  else
-    path, err = vim.loop.cwd()
-  end
-  if not path then
-    notify.error(err)
-    return nil
-  end
+  self.uid_explorer = vim.loop.hrtime()
+  self.augroup_id = vim.api.nvim_create_augroup("NvimTree_Explorer_" .. self.uid_explorer, {})
 
-  ---@type Explorer
-  local explorer_placeholder = nil
+  self.open = true
+  self.opts = config
 
-  local o = RootNode:create(explorer_placeholder, path, "..", nil)
+  self.sorters = Sorters:create(config)
+  self.renderer = Renderer:new(config, self)
+  self.filters = Filters:new(config, self)
+  self.live_filter = LiveFilter:new(config, self)
+  self.marks = Marks:new(config, self)
+  self.clipboard = Clipboard:new(config, self)
 
-  o = self:new(o)
+  self:create_autocmds()
 
-  o.explorer = o
-
-  o.uid_explorer = vim.loop.hrtime()
-  o.augroup_id = vim.api.nvim_create_augroup("NvimTree_Explorer_" .. o.uid_explorer, {})
-
-  o.open = true
-  o.opts = config
-
-  o.sorters = Sorters:create(config)
-  o.renderer = Renderer:new(config, o)
-  o.filters = Filters:new(config, o)
-  o.live_filter = LiveFilter:new(config, o)
-  o.marks = Marks:new(config, o)
-  o.clipboard = Clipboard:new(config, o)
-
-  o:create_autocmds()
-
-  o:_load(o)
-
-  return o
+  self:_load(self)
 end
 
 function Explorer:destroy()

lua/nvim-tree/node/directory-link.lua

@@ -3,12 +3,9 @@ local utils = require("nvim-tree.utils")
 
 local DirectoryNode = require("nvim-tree.node.directory")
 
----@class (exact) DirectoryLinkNode: DirectoryNode
----@field link_to string absolute path
----@field private fs_stat_target uv.fs_stat.result
-local DirectoryLinkNode = DirectoryNode:new()
+---@class (exact) DirectoryLinkNode: DirectoryNode, LinkNode
+local DirectoryLinkNode = DirectoryNode:extend()
 
----Static factory method
 ---@param explorer Explorer
 ---@param parent DirectoryNode
 ---@param absolute_path string
@@ -16,21 +13,16 @@ local DirectoryLinkNode = DirectoryNode:new()
 ---@param name string
 ---@param fs_stat uv.fs_stat.result?
 ---@param fs_stat_target uv.fs_stat.result
----@return DirectoryLinkNode? nil on vim.loop.fs_realpath failure
-function DirectoryLinkNode:create(explorer, parent, absolute_path, link_to, name, fs_stat, fs_stat_target)
+function DirectoryLinkNode:new(explorer, parent, absolute_path, link_to, name, fs_stat, fs_stat_target)
   -- create DirectoryNode with the target path for the watcher
-  local o = DirectoryNode:create(explorer, parent, link_to, name, fs_stat)
-
-  o = self:new(o)
+  DirectoryLinkNode.super.new(self, explorer, parent, link_to, name, fs_stat)
 
   -- reset absolute path to the link itself
-  o.absolute_path = absolute_path
+  self.absolute_path = absolute_path
 
-  o.type = "link"
-  o.link_to = link_to
-  o.fs_stat_target = fs_stat_target
-
-  return o
+  self.type = "link"
+  self.link_to = link_to
+  self.fs_stat_target = fs_stat_target
 end
 
 function DirectoryLinkNode:destroy()

lua/nvim-tree/node/directory.lua

@@ -10,45 +10,38 @@ local Node = require("nvim-tree.node")
 ---@field open boolean
 ---@field hidden_stats table? -- Each field of this table is a key for source and value for count
 ---@field private watcher Watcher?
-local DirectoryNode = Node:new()
+local DirectoryNode = Node:extend()
 
----Static factory method
 ---@param explorer Explorer
 ---@param parent DirectoryNode?
 ---@param absolute_path string
 ---@param name string
 ---@param fs_stat uv.fs_stat.result|nil
----@return DirectoryNode
-function DirectoryNode:create(explorer, parent, absolute_path, name, fs_stat)
+function DirectoryNode:new(explorer, parent, absolute_path, name, fs_stat)
+  DirectoryNode.super.new(self)
+
   local handle = vim.loop.fs_scandir(absolute_path)
   local has_children = handle and vim.loop.fs_scandir_next(handle) ~= nil or false
 
-  ---@type DirectoryNode
-  local o = {
-    type = "directory",
-    explorer = explorer,
-    absolute_path = absolute_path,
-    executable = false,
-    fs_stat = fs_stat,
-    git_status = nil,
-    hidden = false,
-    name = name,
-    parent = parent,
-    watcher = nil,
-    diag_status = nil,
-    is_dot = false,
+  self.type = "directory"
+  self.explorer = explorer
+  self.absolute_path = absolute_path
+  self.executable = false
+  self.fs_stat = fs_stat
+  self.git_status = nil
+  self.hidden = false
+  self.name = name
+  self.parent = parent
+  self.watcher = nil
+  self.diag_status = nil
 
-    has_children = has_children,
-    group_next = nil,
-    nodes = {},
-    open = false,
-    hidden_stats = nil,
-  }
-  o = self:new(o)
+  self.has_children = has_children
+  self.group_next = nil
+  self.nodes = {}
+  self.open = false
+  self.hidden_stats = nil
 
-  o.watcher = require("nvim-tree.explorer.watch").create_watcher(o)
-
-  return o
+  self.watcher = require("nvim-tree.explorer.watch").create_watcher(self)
 end
 
 function DirectoryNode:destroy()

lua/nvim-tree/node/factory.lua

@@ -21,11 +21,11 @@ function M.create_node(explorer, parent, absolute_path, stat, name)
   if stat.type == "directory" then
     -- directory must be readable and enumerable
     if vim.loop.fs_access(absolute_path, "R") and Watcher.is_fs_event_capable(absolute_path) then
-      return DirectoryNode:create(explorer, parent, absolute_path, name, stat)
+      return DirectoryNode(explorer, parent, absolute_path, name, stat)
     end
   elseif stat.type == "file" then
     -- any file
-    return FileNode:create(explorer, parent, absolute_path, name, stat)
+    return FileNode(explorer, parent, absolute_path, name, stat)
   elseif stat.type == "link" then
     -- link target path and stat must resolve
     local link_to = vim.loop.fs_realpath(absolute_path)
@@ -36,9 +36,9 @@ function M.create_node(explorer, parent, absolute_path, stat, name)
 
     -- choose directory or file
     if link_to_stat.type == "directory" then
-      return DirectoryLinkNode:create(explorer, parent, absolute_path, link_to, name, stat, link_to_stat)
+      return DirectoryLinkNode(explorer, parent, absolute_path, link_to, name, stat, link_to_stat)
     else
-      return FileLinkNode:create(explorer, parent, absolute_path, link_to, name, stat, link_to_stat)
+      return FileLinkNode(explorer, parent, absolute_path, link_to, name, stat, link_to_stat)
     end
   end
 

lua/nvim-tree/node/file-link.lua

@@ -3,12 +3,9 @@ local utils = require("nvim-tree.utils")
 
 local FileNode = require("nvim-tree.node.file")
 
----@class (exact) FileLinkNode: FileNode
----@field link_to string absolute path
----@field private fs_stat_target uv.fs_stat.result
-local FileLinkNode = FileNode:new()
+---@class (exact) FileLinkNode: FileNode, LinkNode
+local FileLinkNode = FileNode:extend()
 
----Static factory method
 ---@param explorer Explorer
 ---@param parent DirectoryNode
 ---@param absolute_path string
@@ -16,17 +13,12 @@ local FileLinkNode = FileNode:new()
 ---@param name string
 ---@param fs_stat uv.fs_stat.result?
 ---@param fs_stat_target uv.fs_stat.result
----@return FileLinkNode? nil on vim.loop.fs_realpath failure
-function FileLinkNode:create(explorer, parent, absolute_path, link_to, name, fs_stat, fs_stat_target)
-  local o = FileNode:create(explorer, parent, absolute_path, name, fs_stat)
+function FileLinkNode:new(explorer, parent, absolute_path, link_to, name, fs_stat, fs_stat_target)
+  FileLinkNode.super.new(self, explorer, parent, absolute_path, name, fs_stat)
 
-  o = self:new(o)
-
-  o.type = "link"
-  o.link_to = link_to
-  o.fs_stat_target = fs_stat_target
-
-  return o
+  self.type = "link"
+  self.link_to = link_to
+  self.fs_stat_target = fs_stat_target
 end
 
 function FileLinkNode:destroy()

lua/nvim-tree/node/file.lua

@@ -15,35 +15,28 @@ local PICTURE_MAP = {
 
 ---@class (exact) FileNode: Node
 ---@field extension string
-local FileNode = Node:new()
+local FileNode = Node:extend()
 
----Static factory method
 ---@param explorer Explorer
 ---@param parent DirectoryNode
 ---@param absolute_path string
 ---@param name string
 ---@param fs_stat uv.fs_stat.result?
----@return FileNode
-function FileNode:create(explorer, parent, absolute_path, name, fs_stat)
-  ---@type FileNode
-  local o = {
-    type = "file",
-    explorer = explorer,
-    absolute_path = absolute_path,
-    executable = utils.is_executable(absolute_path),
-    fs_stat = fs_stat,
-    git_status = nil,
-    hidden = false,
-    name = name,
-    parent = parent,
-    diag_status = nil,
-    is_dot = false,
+function FileNode:new(explorer, parent, absolute_path, name, fs_stat)
+  FileNode.super.new(self)
 
-    extension = string.match(name, ".?[^.]+%.(.*)") or "",
-  }
-  o = self:new(o)
+  self.type = "file"
+  self.explorer = explorer
+  self.absolute_path = absolute_path
+  self.executable = utils.is_executable(absolute_path)
+  self.fs_stat = fs_stat
+  self.git_status = nil
+  self.hidden = false
+  self.name = name
+  self.parent = parent
+  self.diag_status = nil
 
-  return o
+  self.extension = string.match(name, ".?[^.]+%.(.*)") or ""
 end
 
 function FileNode:destroy()

lua/nvim-tree/node/init.lua

@@ -1,8 +1,7 @@
-local Class = require("nvim-tree.class")
+local Object = require("nvim-tree.classic")
 
 ---Abstract Node class.
----Uses the abstract factory pattern to instantiate child instances.
----@class (exact) Node: Class
+---@class (exact) Node: Object
 ---@field type NODE_TYPE
 ---@field explorer Explorer
 ---@field absolute_path string
@@ -14,7 +13,11 @@ local Class = require("nvim-tree.class")
 ---@field parent DirectoryNode?
 ---@field diag_status DiagStatus?
 ---@field private is_dot boolean cached is_dotfile
-local Node = Class:new()
+local Node = Object:extend()
+
+function Node:new()
+  self.is_dot = false
+end
 
 function Node:destroy()
 end

lua/nvim-tree/node/link.lua

@@ -0,0 +1,8 @@
+local Object = require("nvim-tree.classic")
+
+---@class (exact) LinkNode: Object
+---@field link_to string
+---@field protected fs_stat_target uv.fs_stat.result
+local LinkNode = Object:extend()
+
+return LinkNode

lua/nvim-tree/node/root.lua

@@ -1,20 +1,14 @@
 local DirectoryNode = require("nvim-tree.node.directory")
 
 ---@class (exact) RootNode: DirectoryNode
-local RootNode = DirectoryNode:new()
+local RootNode = DirectoryNode:extend()
 
----Static factory method
 ---@param explorer Explorer
 ---@param absolute_path string
 ---@param name string
 ---@param fs_stat uv.fs_stat.result|nil
----@return RootNode
-function RootNode:create(explorer, absolute_path, name, fs_stat)
-  local o = DirectoryNode:create(explorer, nil, absolute_path, name, fs_stat)
-
-  o = self:new(o)
-
-  return o
+function RootNode:new(explorer, absolute_path, name, fs_stat)
+  RootNode.super.new(self, explorer, nil, absolute_path, name, fs_stat)
 end
 
 ---Root is never a dotfile