feat(#2415): colour and highlight overhaul, see :help nvim-tree-highlight-overhaul (#2455)

* feat(#2415): granular highlight_diagnostics, normalise groups (#2454)

* chore: normalise colours and enable cterm (#2471)

* feat(#2415): granular highlight_git, normalise git groups (#2487)

* docs: update CONTRIBUTING.md (#2485)

* feat(#2415): granular highlight_git, normalise git groups

* feat(#2415): normalise and add modified groups

* feat(#2415): create Decorator class for modified and bookmarks

* feat(#2415): create DecoratorDiagnostics

* feat(#2415): create DecoratorGit

* feat(#2415): create DecoratorGit

* add DecoratorCopied DecoratorCut

* add DecoratorOpened

* remove unloaded_bufnr checks as the view debouncer takes care of it

* Add `renderer.highlight_git` to accepted strings

* fix(#2415): builder refactor (#2538)

* simplify builder signs

* decorators take care of themselves and are priority ordered

* simplify builder hl groups

* refactor builder for icon arrays

* builder use decorators generically

* fix(#2415): harden sign creation (#2539)

* fix(#2415): harden unicode signs

* Decorator tidy

* normalise git sign creation and tidy

* tidy builder

* NvimTreeBookmarkIcon

* tidy HL doc

* tidy HL doc

* tidy HL doc

* tidy builder doc

* standardise on '---@param'

* DiagnosticWarning -> DiagnosticWarn

* annotate decorators

* limit to two highlight groups for line rendering

* style

* apply #2519

* feat(#2415): combined hl groups (#2601)

* feat(#2415): create combined highlight groups

* feat(#2415): create combined highlight groups

* feat(#2415): create combined highlight groups

* ci: allow workflow_dispatch (#2620)

* one and only one hl namespace, required winhl removal

* small tidies

* colors.lua -> appearance.lua

* full-name uses one and only namespace

* don't highlight fast, just apply to namespace, safer win_set_hl

* gut builder (#2622)

collapse Builder

* fix group_empty function check

* feat(#2415): highlight-overhaul release date

---------

Co-authored-by: Akmadan23 <azadahmadi@mailo.com>

lua/nvim-tree/renderer/builder.lua

@@ -1,136 +1,94 @@
-local utils = require "nvim-tree.utils"
+local appearance = require "nvim-tree.appearance"
 local core = require "nvim-tree.core"
+local live_filter = require "nvim-tree.live-filter"
 local notify = require "nvim-tree.notify"
+local utils = require "nvim-tree.utils"
+local view = require "nvim-tree.view"
+local log = require "nvim-tree.log"
+
+local DecoratorBookmarks = require "nvim-tree.renderer.decorator.bookmarks"
+local DecoratorCopied = require "nvim-tree.renderer.decorator.copied"
+local DecoratorCut = require "nvim-tree.renderer.decorator.cut"
+local DecoratorDiagnostics = require "nvim-tree.renderer.decorator.diagnostics"
+local DecoratorGit = require "nvim-tree.renderer.decorator.git"
+local DecoratorModified = require "nvim-tree.renderer.decorator.modified"
+local DecoratorOpened = require "nvim-tree.renderer.decorator.opened"
 
-local git = require "nvim-tree.renderer.components.git"
 local pad = require "nvim-tree.renderer.components.padding"
 local icons = require "nvim-tree.renderer.components.icons"
-local modified = require "nvim-tree.renderer.components.modified"
-local diagnostics = require "nvim-tree.renderer.components.diagnostics"
-local bookmarks = require "nvim-tree.renderer.components.bookmarks"
 
-local HL_POSITION = require("nvim-tree.enum").HL_POSITION
+local M = {
+  opts = {},
+  decorators = {},
+  picture_map = {
+    jpg = true,
+    jpeg = true,
+    png = true,
+    gif = true,
+    webp = true,
+    jxl = true,
+  },
+}
 
+---@class HighlightedString
+---@field str string
+---@field hl string[]
+
+---@class AddHighlightArgs
+---@field group string[]
+---@field line number
+---@field col_start number
+---@field col_end number
+
+---@class Builder
+---@field lines string[] includes icons etc.
+---@field hl_args AddHighlightArgs[] line highlights
+---@field signs string[] line signs
+---@field private root_cwd string absolute path
+---@field private index number
+---@field private depth number
+---@field private combined_groups string[] combined group names
+---@field private markers boolean[] indent markers
 local Builder = {}
-Builder.__index = Builder
 
-local DEFAULT_ROOT_FOLDER_LABEL = ":~:s?$?/..?"
-
-function Builder.new(root_cwd)
-  return setmetatable({
+---@return Builder
+function Builder:new()
+  local o = {
+    root_cwd = core.get_cwd(),
     index = 0,
     depth = 0,
-    highlights = {},
+    hl_args = {},
+    combined_groups = {},
     lines = {},
     markers = {},
     signs = {},
-    root_cwd = root_cwd,
-  }, Builder)
+  }
+  setmetatable(o, self)
+  self.__index = self
+
+  return o
 end
 
-function Builder:configure_root_label(root_folder_label)
-  self.root_folder_label = root_folder_label or DEFAULT_ROOT_FOLDER_LABEL
-  return self
+---Insert ranged highlight groups into self.highlights
+---@private
+---@param groups string[]
+---@param start number
+---@param end_ number|nil
+function Builder:insert_highlight(groups, start, end_)
+  table.insert(self.hl_args, { groups, self.index, start, end_ or -1 })
 end
 
-function Builder:configure_trailing_slash(with_trailing)
-  self.trailing_slash = with_trailing and "/" or ""
-  return self
-end
-
-function Builder:configure_special_files(special_files)
-  self.special_files = special_files
-  return self
-end
-
-function Builder:configure_picture_map(picture_map)
-  self.picture_map = picture_map
-  return self
-end
-
-function Builder:configure_filter(filter, prefix)
-  self.filter_prefix = prefix
-  self.filter = filter
-  return self
-end
-
-function Builder:configure_opened_file_highlighting(highlight_opened_files)
-  self.highlight_opened_files = highlight_opened_files
-  return self
-end
-
-function Builder:configure_modified_highlighting(highlight_modified)
-  self.highlight_modified = highlight_modified
-  return self
-end
-
-function Builder:configure_icon_padding(padding)
-  self.icon_padding = padding or " "
-  return self
-end
-
-function Builder:configure_git_icons_placement(where)
-  if where ~= "after" and where ~= "before" and where ~= "signcolumn" then
-    where = "before" -- default before
-  end
-  self.git_placement = where
-  return self
-end
-
-function Builder:configure_diagnostics_icon_placement(where)
-  if where ~= "after" and where ~= "before" and where ~= "signcolumn" then
-    where = "before" -- default before
-  end
-  self.diagnostics_placement = where
-  return self
-end
-
-function Builder:configure_bookmark_icon_placement(where)
-  if where ~= "after" and where ~= "before" and where ~= "signcolumn" then
-    where = "before" -- default before
-  end
-  self.bookmarks_placement = where
-  return self
-end
-
-function Builder:configure_modified_placement(where)
-  if where ~= "after" and where ~= "before" and where ~= "signcolumn" then
-    where = "after" -- default after
-  end
-  self.modified_placement = where
-  return self
-end
-
-function Builder:configure_symlink_destination(show)
-  self.symlink_destination = show
-  return self
-end
-
-function Builder:configure_group_name_modifier(group_name_modifier)
-  if type(group_name_modifier) == "function" then
-    self.group_name_modifier = group_name_modifier
-  end
-  return self
-end
-
-function Builder:_insert_highlight(group, start, end_)
-  table.insert(self.highlights, { group, self.index, start, end_ or -1 })
-end
-
-function Builder:_insert_line(line)
-  table.insert(self.lines, line)
-end
-
-function Builder:_get_folder_name(node)
+---@private
+function Builder:get_folder_name(node)
   local name = node.name
   local next = node.group_next
   while next do
-    name = name .. "/" .. next.name
+    name = string.format("%s/%s", name, next.name)
     next = next.group_next
   end
 
-  if node.group_next and self.group_name_modifier then
-    local new_name = self.group_name_modifier(name)
+  if node.group_next and type(M.opts.renderer.group_empty) == "function" then
+    local new_name = M.opts.renderer.group_empty(name)
     if type(new_name) == "string" then
       name = new_name
     else
@@ -138,16 +96,13 @@ function Builder:_get_folder_name(node)
     end
   end
 
-  return name .. self.trailing_slash
+  return string.format("%s%s", name, M.opts.renderer.add_trailing and "/" or "")
 end
 
----@class HighlightedString
----@field str string
----@field hl string[]
-
+---@private
 ---@param highlighted_strings HighlightedString[]
 ---@return string
-function Builder:_unwrap_highlighted_strings(highlighted_strings)
+function Builder:unwrap_highlighted_strings(highlighted_strings)
   if not highlighted_strings then
     return ""
   end
@@ -156,21 +111,22 @@ function Builder:_unwrap_highlighted_strings(highlighted_strings)
   for _, v in ipairs(highlighted_strings) do
     if #v.str > 0 then
       if v.hl and type(v.hl) == "table" then
-        self:_insert_highlight(v.hl, #string, #string + #v.str)
+        self:insert_highlight(v.hl, #string, #string + #v.str)
       end
-      string = string .. v.str
+      string = string.format("%s%s", string, v.str)
     end
   end
   return string
 end
 
+---@private
 ---@param node table
 ---@return HighlightedString icon
 ---@return HighlightedString name
-function Builder:_build_folder(node)
+function Builder:build_folder(node)
   local has_children = #node.nodes ~= 0 or node.has_children
   local icon, icon_hl = icons.get_folder_icon(node, has_children)
-  local foldername = self:_get_folder_name(node)
+  local foldername = self:get_folder_name(node)
 
   if #icon > 0 and icon_hl == nil then
     if node.open then
@@ -181,12 +137,14 @@ function Builder:_build_folder(node)
   end
 
   local foldername_hl = "NvimTreeFolderName"
-  if node.link_to and self.symlink_destination then
+  if node.link_to and M.opts.renderer.symlink_destination then
     local arrow = icons.i.symlink_arrow
-    local link_to = utils.path_relative(node.link_to, core.get_cwd())
-    foldername = foldername .. arrow .. link_to
+    local link_to = utils.path_relative(node.link_to, self.root_cwd)
+    foldername = string.format("%s%s%s", foldername, arrow, link_to)
     foldername_hl = "NvimTreeSymlinkFolderName"
-  elseif vim.tbl_contains(self.special_files, node.absolute_path) or vim.tbl_contains(self.special_files, node.name) then
+  elseif
+    vim.tbl_contains(M.opts.renderer.special_files, node.absolute_path) or vim.tbl_contains(M.opts.renderer.special_files, node.name)
+  then
     foldername_hl = "NvimTreeSpecialFolderName"
   elseif node.open then
     foldername_hl = "NvimTreeOpenedFolderName"
@@ -197,174 +155,56 @@ function Builder:_build_folder(node)
   return { str = icon, hl = { icon_hl } }, { str = foldername, hl = { foldername_hl } }
 end
 
+---@private
 ---@param node table
 ---@return HighlightedString icon
 ---@return HighlightedString name
-function Builder:_build_symlink(node)
+function Builder:build_symlink(node)
   local icon = icons.i.symlink
   local arrow = icons.i.symlink_arrow
   local symlink_formatted = node.name
-  if self.symlink_destination then
-    local link_to = utils.path_relative(node.link_to, core.get_cwd())
-    symlink_formatted = symlink_formatted .. arrow .. link_to
+  if M.opts.renderer.symlink_destination then
+    local link_to = utils.path_relative(node.link_to, self.root_cwd)
+    symlink_formatted = string.format("%s%s%s", symlink_formatted, arrow, link_to)
   end
 
   return { str = icon, hl = { "NvimTreeSymlinkIcon" } }, { str = symlink_formatted, hl = { "NvimTreeSymlink" } }
 end
 
----@param node table
----@return HighlightedString icon
-function Builder:_build_file_icon(node)
-  local icon, hl_group = icons.get_file_icon(node.name, node.extension)
-  return { str = icon, hl = { hl_group } }
-end
-
+---@private
 ---@param node table
 ---@return HighlightedString icon
 ---@return HighlightedString name
-function Builder:_build_file(node)
-  local icon = self:_build_file_icon(node)
-
+function Builder:build_file(node)
   local hl
-  if vim.tbl_contains(self.special_files, node.absolute_path) or vim.tbl_contains(self.special_files, node.name) then
+  if vim.tbl_contains(M.opts.renderer.special_files, node.absolute_path) or vim.tbl_contains(M.opts.renderer.special_files, node.name) then
     hl = "NvimTreeSpecialFile"
   elseif node.executable then
     hl = "NvimTreeExecFile"
-  elseif self.picture_map[node.extension] then
+  elseif M.picture_map[node.extension] then
     hl = "NvimTreeImageFile"
   end
 
-  return icon, { str = node.name, hl = { hl } }
-end
-
----@param node table
----@return HighlightedString[]|nil icon
-function Builder:_get_git_icons(node)
-  local git_icons = git.get_icons(node)
-  if git_icons and #git_icons > 0 and self.git_placement == "signcolumn" then
-    table.insert(self.signs, {
-      sign = git_icons[1].hl[1],
-      lnum = self.index + 1,
-      priority = 1,
-    })
-    git_icons = nil
-  end
-  return git_icons
-end
-
----@param node table
----@return HighlightedString[]|nil icon
-function Builder:_get_diagnostics_icon(node)
-  local diagnostics_icon = diagnostics.get_icon(node)
-  if diagnostics_icon and self.diagnostics_placement == "signcolumn" then
-    table.insert(self.signs, {
-      sign = diagnostics_icon.hl[1],
-      lnum = self.index + 1,
-      priority = 2,
-    })
-    diagnostics_icon = nil
-  end
-  return diagnostics_icon
-end
-
----@param node table
----@return HighlightedString|nil icon
-function Builder:_get_modified_icon(node)
-  local modified_icon = modified.get_icon(node)
-  if modified_icon and self.modified_placement == "signcolumn" then
-    table.insert(self.signs, {
-      sign = modified_icon.hl[1],
-      lnum = self.index + 1,
-      priority = 3,
-    })
-    modified_icon = nil
-  end
-  return modified_icon
-end
-
----@param node table
----@return HighlightedString[]|nil icon
-function Builder:_get_bookmark_icon(node)
-  local bookmark_icon = bookmarks.get_icon(node)
-  if bookmark_icon and self.bookmarks_placement == "signcolumn" then
-    table.insert(self.signs, {
-      sign = bookmark_icon.hl[1],
-      lnum = self.index + 1,
-      priority = 4,
-    })
-    bookmark_icon = nil
-  end
-  return bookmark_icon
-end
-
----@param node table
----@return string|nil icon_hl
----@return string|nil name_hl
-function Builder:_get_highlight_override(node, unloaded_bufnr)
-  local name_hl, icon_hl
-
-  -- git
-  local git_highlight = git.get_highlight(node)
-  if git_highlight then
-    name_hl = git_highlight
-  end
-
-  -- opened file
-  if self.highlight_opened_files and vim.fn.bufloaded(node.absolute_path) > 0 and vim.fn.bufnr(node.absolute_path) ~= unloaded_bufnr then
-    if self.highlight_opened_files == "all" or self.highlight_opened_files == "name" then
-      name_hl = "NvimTreeOpenedFile"
-    end
-    if self.highlight_opened_files == "all" or self.highlight_opened_files == "icon" then
-      icon_hl = "NvimTreeOpenedFileIcon"
-    end
-  end
-
-  -- modified file
-  local modified_highlight = modified.get_highlight(node)
-  if modified_highlight then
-    if self.highlight_modified == "all" or self.highlight_modified == "name" then
-      name_hl = modified_highlight
-    end
-    if self.highlight_modified == "all" or self.highlight_modified == "icon" then
-      icon_hl = modified_highlight
-    end
-  end
-
-  return icon_hl, name_hl
-end
-
----Append optional highlighting to icon or name.
----@param node table
----@param get_hl fun(node: table): HL_POSITION, string
----@param icon_hl string[] icons to append to
----@param name_hl string[] names to append to
-function Builder:_append_highlight(node, get_hl, icon_hl, name_hl)
-  local pos, hl = get_hl(node)
-  if pos ~= HL_POSITION.none and hl then
-    if pos == HL_POSITION.all or pos == HL_POSITION.icon then
-      table.insert(icon_hl, hl)
-    end
-    if pos == HL_POSITION.all or pos == HL_POSITION.name then
-      table.insert(name_hl, hl)
-    end
-  end
+  local icon, hl_group = icons.get_file_icon(node.name, node.extension)
+  return { str = icon, hl = { hl_group } }, { str = node.name, hl = { hl } }
 end
 
+---@private
 ---@param indent_markers HighlightedString[]
 ---@param arrows HighlightedString[]|nil
 ---@param icon HighlightedString
 ---@param name HighlightedString
----@param git_icons HighlightedString[]|nil
----@param diagnostics_icon HighlightedString|nil
----@param modified_icon HighlightedString|nil
----@param bookmark_icon HighlightedString|nil
+---@param node table
 ---@return HighlightedString[]
-function Builder:_format_line(indent_markers, arrows, icon, name, git_icons, diagnostics_icon, modified_icon, bookmark_icon)
+function Builder:format_line(indent_markers, arrows, icon, name, node)
   local added_len = 0
   local function add_to_end(t1, t2)
+    if not t2 then
+      return
+    end
     for _, v in ipairs(t2) do
       if added_len > 0 then
-        table.insert(t1, { str = self.icon_padding })
+        table.insert(t1, { str = M.opts.renderer.icons.padding })
       end
       table.insert(t1, v)
     end
@@ -379,78 +219,132 @@ function Builder:_format_line(indent_markers, arrows, icon, name, git_icons, dia
 
   local line = { indent_markers, arrows }
   add_to_end(line, { icon })
-  if git_icons and self.git_placement == "before" then
-    add_to_end(line, git_icons)
-  end
-  if modified_icon and self.modified_placement == "before" then
-    add_to_end(line, { modified_icon })
-  end
-  if diagnostics_icon and self.diagnostics_placement == "before" then
-    add_to_end(line, { diagnostics_icon })
-  end
-  if bookmark_icon and self.bookmarks_placement == "before" then
-    add_to_end(line, { bookmark_icon })
+
+  for i = #M.decorators, 1, -1 do
+    add_to_end(line, M.decorators[i]:icons_before(node))
   end
 
   add_to_end(line, { name })
 
-  if git_icons and self.git_placement == "after" then
-    add_to_end(line, git_icons)
-  end
-  if modified_icon and self.modified_placement == "after" then
-    add_to_end(line, { modified_icon })
-  end
-  if diagnostics_icon and self.diagnostics_placement == "after" then
-    add_to_end(line, { diagnostics_icon })
-  end
-  if bookmark_icon and self.bookmarks_placement == "after" then
-    add_to_end(line, { bookmark_icon })
+  for i = #M.decorators, 1, -1 do
+    add_to_end(line, M.decorators[i]:icons_after(node))
   end
 
+  log.line("dev", "line = %s", vim.inspect(line))
   return line
 end
 
-function Builder:_build_line(node, idx, num_children, unloaded_bufnr)
-  local copy_paste = require "nvim-tree.actions.fs.copy-paste"
+---@private
+---@param node Node
+function Builder:build_signs(node)
+  -- first in priority order
+  local sign_name
+  for _, d in ipairs(M.decorators) do
+    sign_name = d:sign_name(node)
+    if sign_name then
+      self.signs[self.index] = sign_name
+      break
+    end
+  end
+end
 
+---Combined group name less than the 200 byte limit of highlight group names
+---@private
+---@param groups string[] highlight group names
+---@return string name "NvimTreeCombinedHL" .. sha256
+function Builder:combined_group_name(groups)
+  return string.format("NvimTreeCombinedHL%s", vim.fn.sha256(table.concat(groups)))
+end
+
+---Create a highlight group for groups with later groups overriding previous.
+---@private
+---@param groups string[] highlight group names
+function Builder:create_combined_group(groups)
+  local combined_name = self:combined_group_name(groups)
+
+  -- only create if necessary
+  if not vim.tbl_contains(self.combined_groups, combined_name) then
+    local combined_hl = {}
+
+    -- build the highlight, overriding values
+    for _, group in ipairs(groups) do
+      local hl = vim.api.nvim_get_hl(0, { name = group, link = false })
+      combined_hl = vim.tbl_extend("force", combined_hl, hl)
+    end
+
+    -- highlight directly in the namespace
+    vim.api.nvim_set_hl(appearance.NS_ID, combined_name, combined_hl)
+
+    table.insert(self.combined_groups, combined_name)
+  end
+end
+
+---Calculate highlight group for icon and name. A combined highlight group will be created
+---when there is more than one highlight.
+---A highlight group is always calculated and upserted for the case of highlights changing.
+---@private
+---@param node Node
+---@return string|nil icon_hl_group
+---@return string|nil name_hl_group
+function Builder:add_highlights(node)
+  -- result
+  local icon_hl_group, name_hl_group
+
+  -- calculate all groups
+  local icon_groups = {}
+  local name_groups = {}
+  local d, icon, name
+  for i = #M.decorators, 1, -1 do
+    d = M.decorators[i]
+    icon, name = d:groups_icon_name(node)
+    table.insert(icon_groups, icon)
+    table.insert(name_groups, name)
+  end
+
+  -- one or many icon groups
+  if #icon_groups > 1 then
+    icon_hl_group = self:combined_group_name(icon_groups)
+    self:create_combined_group(icon_groups)
+  else
+    icon_hl_group = icon_groups[1]
+  end
+
+  -- one or many name groups
+  if #name_groups > 1 then
+    name_hl_group = self:combined_group_name(name_groups)
+    self:create_combined_group(name_groups)
+  else
+    name_hl_group = name_groups[1]
+  end
+
+  return icon_hl_group, name_hl_group
+end
+
+---@private
+function Builder:build_line(node, idx, num_children)
   -- various components
   local indent_markers = pad.get_indent_markers(self.depth, idx, num_children, node, self.markers)
   local arrows = pad.get_arrows(node)
 
-  -- adds icons to signcolumn
-  local bookmark_icon = self:_get_bookmark_icon(node)
-  local git_icons = self:_get_git_icons(node)
-  local modified_icon = self:_get_modified_icon(node)
-  local diagnostics_icon = self:_get_diagnostics_icon(node)
-
   -- main components
   local is_folder = node.nodes ~= nil
   local is_symlink = node.link_to ~= nil
   local icon, name
   if is_folder then
-    icon, name = self:_build_folder(node)
+    icon, name = self:build_folder(node)
   elseif is_symlink then
-    icon, name = self:_build_symlink(node)
+    icon, name = self:build_symlink(node)
   else
-    icon, name = self:_build_file(node)
+    icon, name = self:build_file(node)
   end
 
-  -- highlight override
-  local icon_hl_override, name_hl_override = self:_get_highlight_override(node, unloaded_bufnr)
-  if icon_hl_override then
-    icon.hl = { icon_hl_override }
-  end
-  if name_hl_override then
-    name.hl = { name_hl_override }
-  end
+  -- highighting
+  local icon_hl_group, name_hl_group = self:add_highlights(node)
+  table.insert(icon.hl, icon_hl_group)
+  table.insert(name.hl, name_hl_group)
 
-  -- extra highighting
-  self:_append_highlight(node, bookmarks.get_highlight, icon.hl, name.hl)
-  self:_append_highlight(node, diagnostics.get_highlight, icon.hl, name.hl)
-  self:_append_highlight(node, copy_paste.get_highlight, icon.hl, name.hl)
-
-  local line = self:_format_line(indent_markers, arrows, icon, name, git_icons, diagnostics_icon, modified_icon, bookmark_icon)
-  self:_insert_line(self:_unwrap_highlighted_strings(line))
+  local line = self:format_line(indent_markers, arrows, icon, name, node)
+  table.insert(self.lines, self:unwrap_highlighted_strings(line))
 
   self.index = self.index + 1
 
@@ -458,13 +352,14 @@ function Builder:_build_line(node, idx, num_children, unloaded_bufnr)
 
   if node.open then
     self.depth = self.depth + 1
-    self:build(node, unloaded_bufnr)
+    self:build_lines(node)
     self.depth = self.depth - 1
   end
 end
 
-function Builder:_get_nodes_number(nodes)
-  if not self.filter then
+---@private
+function Builder:get_nodes_number(nodes)
+  if not live_filter.filter then
     return #nodes
   end
 
@@ -477,53 +372,77 @@ function Builder:_get_nodes_number(nodes)
   return i
 end
 
-function Builder:build(tree, unloaded_bufnr)
-  local num_children = self:_get_nodes_number(tree.nodes)
+---@private
+function Builder:build_lines(node)
+  if not node then
+    node = core.get_explorer()
+  end
+  local num_children = self:get_nodes_number(node.nodes)
   local idx = 1
-  for _, node in ipairs(tree.nodes) do
-    if not node.hidden then
-      self:_build_line(node, idx, num_children, unloaded_bufnr)
+  for _, n in ipairs(node.nodes) do
+    if not n.hidden then
+      self:build_signs(n)
+      self:build_line(n, idx, num_children)
       idx = idx + 1
     end
   end
-
-  return self
 end
 
-local function format_root_name(root_cwd, root_label)
+---@private
+---@param root_label function|string
+---@return string
+function Builder:format_root_name(root_label)
   if type(root_label) == "function" then
-    local label = root_label(root_cwd)
+    local label = root_label(self.root_cwd)
     if type(label) == "string" then
       return label
     else
-      root_label = DEFAULT_ROOT_FOLDER_LABEL
+      return "???"
     end
   end
-  return utils.path_remove_trailing(vim.fn.fnamemodify(root_cwd, root_label))
+  return utils.path_remove_trailing(vim.fn.fnamemodify(self.root_cwd, root_label))
 end
 
-function Builder:build_header(show_header)
-  if show_header then
-    local root_name = format_root_name(self.root_cwd, self.root_folder_label)
-    self:_insert_line(root_name)
-    self:_insert_highlight({ "NvimTreeRootFolder" }, 0, string.len(root_name))
+---@private
+function Builder:build_header()
+  if view.is_root_folder_visible(core.get_cwd()) then
+    local root_name = self:format_root_name(M.opts.renderer.root_folder_label)
+    table.insert(self.lines, root_name)
+    self:insert_highlight({ "NvimTreeRootFolder" }, 0, string.len(root_name))
     self.index = 1
   end
 
-  if self.filter then
-    local filter_line = self.filter_prefix .. "/" .. self.filter .. "/"
-    self:_insert_line(filter_line)
-    local prefix_length = string.len(self.filter_prefix)
-    self:_insert_highlight({ "NvimTreeLiveFilterPrefix" }, 0, prefix_length)
-    self:_insert_highlight({ "NvimTreeLiveFilterValue" }, prefix_length, string.len(filter_line))
+  if live_filter.filter then
+    local filter_line = string.format("%s/%s/", M.opts.live_filter.prefix, live_filter.filter)
+    table.insert(self.lines, filter_line)
+    local prefix_length = string.len(M.opts.live_filter.prefix)
+    self:insert_highlight({ "NvimTreeLiveFilterPrefix" }, 0, prefix_length)
+    self:insert_highlight({ "NvimTreeLiveFilterValue" }, prefix_length, string.len(filter_line))
     self.index = self.index + 1
   end
+end
 
+---Build all lines with highlights and signs
+---@return Builder
+function Builder:build()
+  self:build_header()
+  self:build_lines()
   return self
 end
 
-function Builder:unwrap()
-  return self.lines, self.highlights, self.signs
+function Builder.setup(opts)
+  M.opts = opts
+
+  -- priority order
+  M.decorators = {
+    DecoratorCut:new(opts),
+    DecoratorCopied:new(opts),
+    DecoratorDiagnostics:new(opts),
+    DecoratorBookmarks:new(opts),
+    DecoratorModified:new(opts),
+    DecoratorOpened:new(opts),
+    DecoratorGit:new(opts),
+  }
 end
 
 return Builder

lua/nvim-tree/renderer/components/bookmarks.lua

@@ -1,51 +0,0 @@
-local marks = require "nvim-tree.marks"
-
-local HL_POSITION = require("nvim-tree.enum").HL_POSITION
-
-local M = {
-  ICON = {},
-  hl_pos = HL_POSITION.none,
-}
-
----Bookmark highlight group and position when highlight_bookmark.
----@param node table
----@return HL_POSITION position none when clipboard empty
----@return string|nil group only when node present in clipboard
-function M.get_highlight(node)
-  if M.hl_pos == HL_POSITION.none then
-    return HL_POSITION.none, nil
-  end
-
-  local mark = marks.get_mark(node)
-  if mark then
-    return M.hl_pos, "NvimTreeBookmarkHL"
-  else
-    return HL_POSITION.none, nil
-  end
-end
-
----bookmark icon if marked
----@param node table
----@return HighlightedString|nil bookmark icon
-function M.get_icon(node)
-  if M.config.renderer.icons.show.bookmarks and marks.get_mark(node) then
-    return M.ICON
-  end
-end
-
-function M.setup(opts)
-  M.config = {
-    renderer = opts.renderer,
-  }
-
-  M.hl_pos = HL_POSITION[opts.renderer.highlight_bookmarks] or HL_POSITION.none
-
-  M.ICON = {
-    str = opts.renderer.icons.glyphs.bookmark,
-    hl = { "NvimTreeBookmark" },
-  }
-
-  vim.fn.sign_define(M.ICON.hl[1], { text = M.ICON.str, texthl = M.ICON.hl[1] })
-end
-
-return M

lua/nvim-tree/renderer/components/diagnostics.lua

@@ -2,18 +2,23 @@ local HL_POSITION = require("nvim-tree.enum").HL_POSITION
 local diagnostics = require "nvim-tree.diagnostics"
 
 local M = {
-  HS_FILE = {},
-  HS_FOLDER = {},
-  ICON = {},
-  hl_pos = HL_POSITION.none,
+  -- highlight strings for the icons
+  HS_ICON = {},
+
+  -- highlight groups for HL
+  HG_FILE = {},
+  HG_FOLDER = {},
+
+  -- position for HL
+  HL_POS = HL_POSITION.none,
 }
 
----Diagnostics text highlight group when highlight_diagnostics.
+---Diagnostics highlight group and position when highlight_diagnostics.
 ---@param node table
 ---@return HL_POSITION position none when no status
 ---@return string|nil group only when status
 function M.get_highlight(node)
-  if not node or M.hl_pos == HL_POSITION.none then
+  if not node or M.HL_POS == HL_POSITION.none then
     return HL_POSITION.none, nil
   end
 
@@ -26,7 +31,7 @@ function M.get_highlight(node)
   end
 
   if group then
-    return M.hl_pos, group
+    return M.HL_POS, group
   else
     return HL_POSITION.none, nil
   end
@@ -49,40 +54,38 @@ function M.setup(opts)
   }
 
   if opts.diagnostics.enable and opts.renderer.highlight_diagnostics then
-    -- TODO add a HL_POSITION
-    -- M.hl_pos = HL_POSITION[opts.renderer.highlight_diagnostics]
-    M.hl_pos = HL_POSITION.name
+    M.HL_POS = HL_POSITION[opts.renderer.highlight_diagnostics]
   end
 
-  M.HS_FILE[vim.diagnostic.severity.ERROR] = "NvimTreeLspDiagnosticsErrorText"
-  M.HS_FILE[vim.diagnostic.severity.WARN] = "NvimTreeLspDiagnosticsWarningText"
-  M.HS_FILE[vim.diagnostic.severity.INFO] = "NvimTreeLspDiagnosticsInfoText"
-  M.HS_FILE[vim.diagnostic.severity.HINT] = "NvimTreeLspDiagnosticsHintText"
+  M.HG_FILE[vim.diagnostic.severity.ERROR] = "NvimTreeDiagnosticErrorFileHL"
+  M.HG_FILE[vim.diagnostic.severity.WARN] = "NvimTreeDiagnosticWarningFileHL"
+  M.HG_FILE[vim.diagnostic.severity.INFO] = "NvimTreeDiagnosticInfoFileHL"
+  M.HG_FILE[vim.diagnostic.severity.HINT] = "NvimTreeDiagnosticHintFileHL"
 
-  M.HS_FOLDER[vim.diagnostic.severity.ERROR] = "NvimTreeLspDiagnosticsErrorFolderText"
-  M.HS_FOLDER[vim.diagnostic.severity.WARN] = "NvimTreeLspDiagnosticsWarningFolderText"
-  M.HS_FOLDER[vim.diagnostic.severity.INFO] = "NvimTreeLspDiagnosticsInfoFolderText"
-  M.HS_FOLDER[vim.diagnostic.severity.HINT] = "NvimTreeLspDiagnosticsHintFolderText"
+  M.HG_FOLDER[vim.diagnostic.severity.ERROR] = "NvimTreeDiagnosticErrorFolderHL"
+  M.HG_FOLDER[vim.diagnostic.severity.WARN] = "NvimTreeDiagnosticWarningFolderHL"
+  M.HG_FOLDER[vim.diagnostic.severity.INFO] = "NvimTreeDiagnosticInfoFolderHL"
+  M.HG_FOLDER[vim.diagnostic.severity.HINT] = "NvimTreeDiagnosticHintFolderHL"
 
-  M.ICON[vim.diagnostic.severity.ERROR] = {
+  M.HS_ICON[vim.diagnostic.severity.ERROR] = {
     str = M.config.diagnostics.icons.error,
-    hl = { "NvimTreeLspDiagnosticsError" },
+    hl = { "NvimTreeDiagnosticErrorIcon" },
   }
 
-  M.ICON[vim.diagnostic.severity.WARN] = {
+  M.HS_ICON[vim.diagnostic.severity.WARN] = {
     str = M.config.diagnostics.icons.warning,
-    hl = { "NvimTreeLspDiagnosticsWarning" },
+    hl = { "NvimTreeDiagnosticWarningIcon" },
   }
-  M.ICON[vim.diagnostic.severity.INFO] = {
+  M.HS_ICON[vim.diagnostic.severity.INFO] = {
     str = M.config.diagnostics.icons.info,
-    hl = { "NvimTreeLspDiagnosticsInformation" },
+    hl = { "NvimTreeDiagnosticInfoIcon" },
   }
-  M.ICON[vim.diagnostic.severity.HINT] = {
+  M.HS_ICON[vim.diagnostic.severity.HINT] = {
     str = M.config.diagnostics.icons.hint,
-    hl = { "NvimTreeLspDiagnosticsHint" },
+    hl = { "NvimTreeDiagnosticHintIcon" },
   }
 
-  for _, i in ipairs(M.ICON) do
+  for _, i in ipairs(M.HS_ICON) do
     vim.fn.sign_define(i.hl[1], { text = i.str, texthl = i.hl[1] })
   end
 end

lua/nvim-tree/renderer/components/full-name.lua

@@ -1,3 +1,5 @@
+local appearance = require "nvim-tree.appearance"
+
 local M = {}
 
 local utils = require "nvim-tree.utils"
@@ -66,13 +68,12 @@ local function show()
     style = "minimal",
   })
 
-  local ns_id = vim.api.nvim_get_namespaces()["NvimTreeHighlights"]
-  local extmarks = vim.api.nvim_buf_get_extmarks(0, ns_id, { line_nr - 1, 0 }, { line_nr - 1, -1 }, { details = 1 })
+  local extmarks = vim.api.nvim_buf_get_extmarks(0, appearance.NS_ID, { line_nr - 1, 0 }, { line_nr - 1, -1 }, { details = 1 })
   vim.api.nvim_win_call(M.popup_win, function()
     vim.api.nvim_buf_set_lines(0, 0, -1, true, { line })
     for _, extmark in ipairs(extmarks) do
       local hl = extmark[4]
-      vim.api.nvim_buf_add_highlight(0, ns_id, hl.hl_group, 0, extmark[3], hl.end_col)
+      vim.api.nvim_buf_add_highlight(0, appearance.NS_ID, hl.hl_group, 0, extmark[3], hl.end_col)
     end
     vim.cmd [[ setlocal nowrap cursorline noswapfile nobuflisted buftype=nofile bufhidden=hide ]]
   end)

lua/nvim-tree/renderer/components/git.lua

@@ -1,191 +0,0 @@
-local notify = require "nvim-tree.notify"
-local explorer_node = require "nvim-tree.explorer.node"
-
-local M = {}
-
-local function build_icons_table(i)
-  local icons = {
-    staged = { str = i.staged, hl = { "NvimTreeGitStaged" }, ord = 1 },
-    unstaged = { str = i.unstaged, hl = { "NvimTreeGitDirty" }, ord = 2 },
-    renamed = { str = i.renamed, hl = { "NvimTreeGitRenamed" }, ord = 3 },
-    deleted = { str = i.deleted, hl = { "NvimTreeGitDeleted" }, ord = 4 },
-    unmerged = { str = i.unmerged, hl = { "NvimTreeGitMerge" }, ord = 5 },
-    untracked = { str = i.untracked, hl = { "NvimTreeGitNew" }, ord = 6 },
-    ignored = { str = i.ignored, hl = { "NvimTreeGitIgnored" }, ord = 7 },
-  }
-  return {
-    ["M "] = { icons.staged },
-    [" M"] = { icons.unstaged },
-    ["C "] = { icons.staged },
-    [" C"] = { icons.unstaged },
-    ["CM"] = { icons.unstaged },
-    [" T"] = { icons.unstaged },
-    ["T "] = { icons.staged },
-    ["TM"] = { icons.staged, icons.unstaged },
-    ["MM"] = { icons.staged, icons.unstaged },
-    ["MD"] = { icons.staged },
-    ["A "] = { icons.staged },
-    ["AD"] = { icons.staged },
-    [" A"] = { icons.untracked },
-    -- not sure about this one
-    ["AA"] = { icons.unmerged, icons.untracked },
-    ["AU"] = { icons.unmerged, icons.untracked },
-    ["AM"] = { icons.staged, icons.unstaged },
-    ["??"] = { icons.untracked },
-    ["R "] = { icons.renamed },
-    [" R"] = { icons.renamed },
-    ["RM"] = { icons.unstaged, icons.renamed },
-    ["UU"] = { icons.unmerged },
-    ["UD"] = { icons.unmerged },
-    ["UA"] = { icons.unmerged },
-    [" D"] = { icons.deleted },
-    ["D "] = { icons.deleted },
-    ["DA"] = { icons.unstaged },
-    ["RD"] = { icons.deleted },
-    ["DD"] = { icons.deleted },
-    ["DU"] = { icons.deleted, icons.unmerged },
-    ["!!"] = { icons.ignored },
-    dirty = { icons.unstaged },
-  }
-end
-
-local function build_hl_table()
-  local file = {
-    ["M "] = "NvimTreeFileStaged",
-    ["C "] = "NvimTreeFileStaged",
-    ["AA"] = "NvimTreeFileStaged",
-    ["AD"] = "NvimTreeFileStaged",
-    ["MD"] = "NvimTreeFileStaged",
-    ["T "] = "NvimTreeFileStaged",
-    ["TT"] = "NvimTreeFileStaged",
-    [" M"] = "NvimTreeFileDirty",
-    ["CM"] = "NvimTreeFileDirty",
-    [" C"] = "NvimTreeFileDirty",
-    [" T"] = "NvimTreeFileDirty",
-    ["MM"] = "NvimTreeFileDirty",
-    ["AM"] = "NvimTreeFileDirty",
-    dirty = "NvimTreeFileDirty",
-    ["A "] = "NvimTreeFileStaged",
-    ["??"] = "NvimTreeFileNew",
-    ["AU"] = "NvimTreeFileMerge",
-    ["UU"] = "NvimTreeFileMerge",
-    ["UD"] = "NvimTreeFileMerge",
-    ["DU"] = "NvimTreeFileMerge",
-    ["UA"] = "NvimTreeFileMerge",
-    [" D"] = "NvimTreeFileDeleted",
-    ["DD"] = "NvimTreeFileDeleted",
-    ["RD"] = "NvimTreeFileDeleted",
-    ["D "] = "NvimTreeFileDeleted",
-    ["R "] = "NvimTreeFileRenamed",
-    ["RM"] = "NvimTreeFileRenamed",
-    [" R"] = "NvimTreeFileRenamed",
-    ["!!"] = "NvimTreeFileIgnored",
-    [" A"] = "none",
-  }
-
-  local folder = {}
-  for k, v in pairs(file) do
-    folder[k] = v:gsub("File", "Folder")
-  end
-
-  return file, folder
-end
-
-local function nil_() end
-
-local function warn_status(git_status)
-  notify.warn(string.format("Unrecognized git state '%s'", git_status))
-end
-
----@param node table
----@return HighlightedString[]|nil
-local function get_icons_(node)
-  local git_status = explorer_node.get_git_status(node)
-  if git_status == nil then
-    return nil
-  end
-
-  local inserted = {}
-  local iconss = {}
-
-  for _, s in pairs(git_status) do
-    local icons = M.git_icons[s]
-    if not icons then
-      if not M.config.highlight_git then
-        warn_status(s)
-      end
-      return nil
-    end
-
-    for _, icon in pairs(icons) do
-      if #icon.str > 0 then
-        if not inserted[icon] then
-          table.insert(iconss, icon)
-          inserted[icon] = true
-        end
-      end
-    end
-  end
-
-  if #iconss == 0 then
-    return nil
-  end
-
-  -- sort icons so it looks slightly better
-  table.sort(iconss, function(a, b)
-    return a.ord < b.ord
-  end)
-
-  return iconss
-end
-
-function M.setup_signs(i)
-  vim.fn.sign_define("NvimTreeGitDirty", { text = i.unstaged, texthl = "NvimTreeGitDirty" })
-  vim.fn.sign_define("NvimTreeGitStaged", { text = i.staged, texthl = "NvimTreeGitStaged" })
-  vim.fn.sign_define("NvimTreeGitMerge", { text = i.unmerged, texthl = "NvimTreeGitMerge" })
-  vim.fn.sign_define("NvimTreeGitRenamed", { text = i.renamed, texthl = "NvimTreeGitRenamed" })
-  vim.fn.sign_define("NvimTreeGitNew", { text = i.untracked, texthl = "NvimTreeGitNew" })
-  vim.fn.sign_define("NvimTreeGitDeleted", { text = i.deleted, texthl = "NvimTreeGitDeleted" })
-  vim.fn.sign_define("NvimTreeGitIgnored", { text = i.ignored, texthl = "NvimTreeGitIgnored" })
-end
-
-local function get_highlight_(node)
-  local git_status = explorer_node.get_git_status(node)
-  if git_status == nil then
-    return
-  end
-
-  if node.nodes then
-    return M.folder_hl[git_status[1]]
-  else
-    return M.file_hl[git_status[1]]
-  end
-end
-
-function M.setup(opts)
-  M.config = opts.renderer
-
-  M.git_icons = build_icons_table(opts.renderer.icons.glyphs.git)
-
-  M.file_hl, M.folder_hl = build_hl_table()
-
-  if opts.renderer.icons.git_placement == "signcolumn" then
-    M.setup_signs(opts.renderer.icons.glyphs.git)
-  end
-
-  if opts.renderer.icons.show.git then
-    M.get_icons = get_icons_
-  else
-    M.get_icons = nil_
-  end
-
-  if opts.renderer.highlight_git then
-    M.get_highlight = get_highlight_
-  else
-    M.get_highlight = nil_
-  end
-
-  M.git_show_on_open_dirs = opts.git.show_on_open_dirs
-end
-
-return M

lua/nvim-tree/renderer/components/modified.lua

@@ -1,41 +0,0 @@
-local modified = require "nvim-tree.modified"
-
-local M = {}
-
-local HIGHLIGHT = "NvimTreeModifiedFile"
-
----return modified icon if node is modified, otherwise return empty string
----@param node table
----@return HighlightedString|nil modified icon
-function M.get_icon(node)
-  if not modified.is_modified(node) or not M.show_icon then
-    return nil
-  end
-
-  return { str = M.icon, hl = { HIGHLIGHT } }
-end
-
-function M.setup_signs()
-  vim.fn.sign_define(HIGHLIGHT, { text = M.icon, texthl = HIGHLIGHT })
-end
-
----@param node table
----@return string|nil
-function M.get_highlight(node)
-  if not modified.is_modified(node) then
-    return nil
-  end
-
-  return HIGHLIGHT
-end
-
-function M.setup(opts)
-  M.icon = opts.renderer.icons.glyphs.modified
-  M.show_icon = opts.renderer.icons.show.modified
-
-  if opts.renderer.icons.modified_placement == "signcolumn" then
-    M.setup_signs()
-  end
-end
-
-return M

lua/nvim-tree/renderer/decorator/bookmarks.lua

@@ -0,0 +1,51 @@
+local marks = require "nvim-tree.marks"
+
+local HL_POSITION = require("nvim-tree.enum").HL_POSITION
+local ICON_PLACEMENT = require("nvim-tree.enum").ICON_PLACEMENT
+
+local Decorator = require "nvim-tree.renderer.decorator"
+
+---@class DecoratorBookmarks: Decorator
+---@field icon HighlightedString
+local DecoratorBookmarks = Decorator:new()
+
+---@param opts table
+---@return DecoratorBookmarks
+function DecoratorBookmarks:new(opts)
+  local o = Decorator.new(self, {
+    enabled = true,
+    hl_pos = HL_POSITION[opts.renderer.highlight_bookmarks] or HL_POSITION.none,
+    icon_placement = ICON_PLACEMENT[opts.renderer.icons.bookmarks_placement] or ICON_PLACEMENT.none,
+  })
+  ---@cast o DecoratorBookmarks
+
+  if opts.renderer.icons.show.bookmarks then
+    o.icon = {
+      str = opts.renderer.icons.glyphs.bookmark,
+      hl = { "NvimTreeBookmarkIcon" },
+    }
+    o:define_sign(o.icon)
+  end
+
+  return o
+end
+
+---Bookmark icon: renderer.icons.show.bookmarks and node is marked
+---@param node Node
+---@return HighlightedString[]|nil icons
+function DecoratorBookmarks:calculate_icons(node)
+  if marks.get_mark(node) then
+    return { self.icon }
+  end
+end
+
+---Bookmark highlight: renderer.highlight_bookmarks and node is marked
+---@param node Node
+---@return string|nil group
+function DecoratorBookmarks:calculate_highlight(node)
+  if self.hl_pos ~= HL_POSITION.none and marks.get_mark(node) then
+    return "NvimTreeBookmarkHL"
+  end
+end
+
+return DecoratorBookmarks

lua/nvim-tree/renderer/decorator/copied.lua

@@ -0,0 +1,38 @@
+local copy_paste
+
+local HL_POSITION = require("nvim-tree.enum").HL_POSITION
+local ICON_PLACEMENT = require("nvim-tree.enum").ICON_PLACEMENT
+
+local Decorator = require "nvim-tree.renderer.decorator"
+
+---@class DecoratorCopied: Decorator
+---@field enabled boolean
+---@field icon HighlightedString|nil
+local DecoratorCopied = Decorator:new()
+
+---@param opts table
+---@return DecoratorCopied
+function DecoratorCopied:new(opts)
+  local o = Decorator.new(self, {
+    enabled = true,
+    hl_pos = HL_POSITION[opts.renderer.highlight_clipboard] or HL_POSITION.none,
+    icon_placement = ICON_PLACEMENT.none,
+  })
+  ---@cast o DecoratorCopied
+
+  -- cyclic
+  copy_paste = copy_paste or require "nvim-tree.actions.fs.copy-paste"
+
+  return o
+end
+
+---Copied highlight: renderer.highlight_clipboard and node is copied
+---@param node Node
+---@return string|nil group
+function DecoratorCopied:calculate_highlight(node)
+  if self.hl_pos ~= HL_POSITION.none and copy_paste.is_copied(node) then
+    return "NvimTreeCopiedHL"
+  end
+end
+
+return DecoratorCopied

lua/nvim-tree/renderer/decorator/cut.lua

@@ -0,0 +1,38 @@
+local copy_paste
+
+local HL_POSITION = require("nvim-tree.enum").HL_POSITION
+local ICON_PLACEMENT = require("nvim-tree.enum").ICON_PLACEMENT
+
+local Decorator = require "nvim-tree.renderer.decorator"
+
+---@class DecoratorCut: Decorator
+---@field enabled boolean
+---@field icon HighlightedString|nil
+local DecoratorCut = Decorator:new()
+
+---@param opts table
+---@return DecoratorCut
+function DecoratorCut:new(opts)
+  local o = Decorator.new(self, {
+    enabled = true,
+    hl_pos = HL_POSITION[opts.renderer.highlight_clipboard] or HL_POSITION.none,
+    icon_placement = ICON_PLACEMENT.none,
+  })
+  ---@cast o DecoratorCut
+
+  -- cyclic
+  copy_paste = copy_paste or require "nvim-tree.actions.fs.copy-paste"
+
+  return o
+end
+
+---Cut highlight: renderer.highlight_clipboard and node is cut
+---@param node Node
+---@return string|nil group
+function DecoratorCut:calculate_highlight(node)
+  if self.hl_pos ~= HL_POSITION.none and copy_paste.is_cut(node) then
+    return "NvimTreeCutHL"
+  end
+end
+
+return DecoratorCut

lua/nvim-tree/renderer/decorator/diagnostics.lua

@@ -0,0 +1,110 @@
+local diagnostics = require "nvim-tree.diagnostics"
+
+local HL_POSITION = require("nvim-tree.enum").HL_POSITION
+local ICON_PLACEMENT = require("nvim-tree.enum").ICON_PLACEMENT
+
+local Decorator = require "nvim-tree.renderer.decorator"
+
+-- highlight groups by severity
+local HG_ICON = {
+  [vim.diagnostic.severity.ERROR] = "NvimTreeDiagnosticErrorIcon",
+  [vim.diagnostic.severity.WARN] = "NvimTreeDiagnosticWarnIcon",
+  [vim.diagnostic.severity.INFO] = "NvimTreeDiagnosticInfoIcon",
+  [vim.diagnostic.severity.HINT] = "NvimTreeDiagnosticHintIcon",
+}
+local HG_FILE = {
+  [vim.diagnostic.severity.ERROR] = "NvimTreeDiagnosticErrorFileHL",
+  [vim.diagnostic.severity.WARN] = "NvimTreeDiagnosticWarnFileHL",
+  [vim.diagnostic.severity.INFO] = "NvimTreeDiagnosticInfoFileHL",
+  [vim.diagnostic.severity.HINT] = "NvimTreeDiagnosticHintFileHL",
+}
+local HG_FOLDER = {
+  [vim.diagnostic.severity.ERROR] = "NvimTreeDiagnosticErrorFolderHL",
+  [vim.diagnostic.severity.WARN] = "NvimTreeDiagnosticWarnFolderHL",
+  [vim.diagnostic.severity.INFO] = "NvimTreeDiagnosticInfoFolderHL",
+  [vim.diagnostic.severity.HINT] = "NvimTreeDiagnosticHintFolderHL",
+}
+-- opts.diagnostics.icons.
+local ICON_KEYS = {
+  ["error"] = vim.diagnostic.severity.ERROR,
+  ["warning"] = vim.diagnostic.severity.WARN,
+  ["info"] = vim.diagnostic.severity.INFO,
+  ["hint"] = vim.diagnostic.severity.HINT,
+}
+
+---@class DecoratorDiagnostics: Decorator
+---@field icons HighlightedString[]
+local DecoratorDiagnostics = Decorator:new()
+
+---@param opts table
+---@return DecoratorDiagnostics
+function DecoratorDiagnostics:new(opts)
+  local o = Decorator.new(self, {
+    enabled = opts.diagnostics.enable,
+    hl_pos = HL_POSITION[opts.renderer.highlight_diagnostics] or HL_POSITION.none,
+    icon_placement = ICON_PLACEMENT[opts.renderer.icons.diagnostics_placement] or ICON_PLACEMENT.none,
+  })
+  ---@cast o DecoratorDiagnostics
+
+  if not o.enabled then
+    return o
+  end
+
+  if opts.renderer.icons.show.diagnostics then
+    o.icons = {}
+    for name, sev in pairs(ICON_KEYS) do
+      o.icons[sev] = {
+        str = opts.diagnostics.icons[name],
+        hl = { HG_ICON[sev] },
+      }
+      o:define_sign(o.icons[sev])
+    end
+  end
+
+  return o
+end
+
+---Diagnostic icon: diagnostics.enable, renderer.icons.show.diagnostics and node has status
+---@param node Node
+---@return HighlightedString[]|nil icons
+function DecoratorDiagnostics:calculate_icons(node)
+  if node and self.enabled and self.icons then
+    local diag_status = diagnostics.get_diag_status(node)
+    local diag_value = diag_status and diag_status.value
+
+    if diag_value then
+      return { self.icons[diag_value] }
+    end
+  end
+end
+
+---Diagnostic highlight: diagnostics.enable, renderer.highlight_diagnostics and node has status
+---@param node Node
+---@return string|nil group
+function DecoratorDiagnostics:calculate_highlight(node)
+  if not node or not self.enabled or self.hl_pos == HL_POSITION.none then
+    return nil
+  end
+
+  local diag_status = diagnostics.get_diag_status(node)
+  local diag_value = diag_status and diag_status.value
+
+  if not diag_value then
+    return nil
+  end
+
+  local group
+  if node.nodes then
+    group = HG_FOLDER[diag_value]
+  else
+    group = HG_FILE[diag_value]
+  end
+
+  if group then
+    return group
+  else
+    return nil
+  end
+end
+
+return DecoratorDiagnostics

lua/nvim-tree/renderer/decorator/git.lua

@@ -0,0 +1,221 @@
+local notify = require "nvim-tree.notify"
+local explorer_node = require "nvim-tree.explorer.node"
+
+local HL_POSITION = require("nvim-tree.enum").HL_POSITION
+local ICON_PLACEMENT = require("nvim-tree.enum").ICON_PLACEMENT
+
+local Decorator = require "nvim-tree.renderer.decorator"
+
+---@class HighlightedStringGit: HighlightedString
+---@field ord number decreasing priority
+
+---@class DecoratorGit: Decorator
+---@field file_hl table<string, string> by porcelain status e.g. "AM"
+---@field folder_hl table<string, string> by porcelain status
+---@field icons_by_status HighlightedStringGit[] by human status
+---@field icons_by_xy table<string, HighlightedStringGit[]> by porcelain status
+local DecoratorGit = Decorator:new()
+
+---@param opts table
+---@return DecoratorGit
+function DecoratorGit:new(opts)
+  local o = Decorator.new(self, {
+    enabled = opts.git.enable,
+    hl_pos = HL_POSITION[opts.renderer.highlight_git] or HL_POSITION.none,
+    icon_placement = ICON_PLACEMENT[opts.renderer.icons.git_placement] or ICON_PLACEMENT.none,
+  })
+  ---@cast o DecoratorGit
+
+  if not o.enabled then
+    return o
+  end
+
+  if o.hl_pos ~= HL_POSITION.none then
+    o:build_hl_table()
+  end
+
+  if opts.renderer.icons.show.git then
+    o:build_icons_by_status(opts.renderer.icons.glyphs.git)
+    o:build_icons_by_xy(o.icons_by_status)
+
+    for _, icon in pairs(o.icons_by_status) do
+      self:define_sign(icon)
+    end
+  end
+
+  return o
+end
+
+---@param glyphs table<string, string> user glyps
+function DecoratorGit:build_icons_by_status(glyphs)
+  self.icons_by_status = {
+    staged = { str = glyphs.staged, hl = { "NvimTreeGitStagedIcon" }, ord = 1 },
+    unstaged = { str = glyphs.unstaged, hl = { "NvimTreeGitDirtyIcon" }, ord = 2 },
+    renamed = { str = glyphs.renamed, hl = { "NvimTreeGitRenamedIcon" }, ord = 3 },
+    deleted = { str = glyphs.deleted, hl = { "NvimTreeGitDeletedIcon" }, ord = 4 },
+    unmerged = { str = glyphs.unmerged, hl = { "NvimTreeGitMergeIcon" }, ord = 5 },
+    untracked = { str = glyphs.untracked, hl = { "NvimTreeGitNewIcon" }, ord = 6 },
+    ignored = { str = glyphs.ignored, hl = { "NvimTreeGitIgnoredIcon" }, ord = 7 },
+  }
+end
+
+---@param icons HighlightedStringGit[]
+function DecoratorGit:build_icons_by_xy(icons)
+  self.icons_by_xy = {
+    ["M "] = { icons.staged },
+    [" M"] = { icons.unstaged },
+    ["C "] = { icons.staged },
+    [" C"] = { icons.unstaged },
+    ["CM"] = { icons.unstaged },
+    [" T"] = { icons.unstaged },
+    ["T "] = { icons.staged },
+    ["TM"] = { icons.staged, icons.unstaged },
+    ["MM"] = { icons.staged, icons.unstaged },
+    ["MD"] = { icons.staged },
+    ["A "] = { icons.staged },
+    ["AD"] = { icons.staged },
+    [" A"] = { icons.untracked },
+    -- not sure about this one
+    ["AA"] = { icons.unmerged, icons.untracked },
+    ["AU"] = { icons.unmerged, icons.untracked },
+    ["AM"] = { icons.staged, icons.unstaged },
+    ["??"] = { icons.untracked },
+    ["R "] = { icons.renamed },
+    [" R"] = { icons.renamed },
+    ["RM"] = { icons.unstaged, icons.renamed },
+    ["UU"] = { icons.unmerged },
+    ["UD"] = { icons.unmerged },
+    ["UA"] = { icons.unmerged },
+    [" D"] = { icons.deleted },
+    ["D "] = { icons.deleted },
+    ["DA"] = { icons.unstaged },
+    ["RD"] = { icons.deleted },
+    ["DD"] = { icons.deleted },
+    ["DU"] = { icons.deleted, icons.unmerged },
+    ["!!"] = { icons.ignored },
+    dirty = { icons.unstaged },
+  }
+end
+
+function DecoratorGit:build_hl_table()
+  self.file_hl = {
+    ["M "] = "NvimTreeGitFileStagedHL",
+    ["C "] = "NvimTreeGitFileStagedHL",
+    ["AA"] = "NvimTreeGitFileStagedHL",
+    ["AD"] = "NvimTreeGitFileStagedHL",
+    ["MD"] = "NvimTreeGitFileStagedHL",
+    ["T "] = "NvimTreeGitFileStagedHL",
+    ["TT"] = "NvimTreeGitFileStagedHL",
+    [" M"] = "NvimTreeGitFileDirtyHL",
+    ["CM"] = "NvimTreeGitFileDirtyHL",
+    [" C"] = "NvimTreeGitFileDirtyHL",
+    [" T"] = "NvimTreeGitFileDirtyHL",
+    ["MM"] = "NvimTreeGitFileDirtyHL",
+    ["AM"] = "NvimTreeGitFileDirtyHL",
+    dirty = "NvimTreeGitFileDirtyHL",
+    ["A "] = "NvimTreeGitFileStagedHL",
+    ["??"] = "NvimTreeGitFileNewHL",
+    ["AU"] = "NvimTreeGitFileMergeHL",
+    ["UU"] = "NvimTreeGitFileMergeHL",
+    ["UD"] = "NvimTreeGitFileMergeHL",
+    ["DU"] = "NvimTreeGitFileMergeHL",
+    ["UA"] = "NvimTreeGitFileMergeHL",
+    [" D"] = "NvimTreeGitFileDeletedHL",
+    ["DD"] = "NvimTreeGitFileDeletedHL",
+    ["RD"] = "NvimTreeGitFileDeletedHL",
+    ["D "] = "NvimTreeGitFileDeletedHL",
+    ["R "] = "NvimTreeGitFileRenamedHL",
+    ["RM"] = "NvimTreeGitFileRenamedHL",
+    [" R"] = "NvimTreeGitFileRenamedHL",
+    ["!!"] = "NvimTreeGitFileIgnoredHL",
+    [" A"] = "none",
+  }
+
+  self.folder_hl = {}
+  for k, v in pairs(self.file_hl) do
+    self.folder_hl[k] = v:gsub("File", "Folder")
+  end
+end
+
+---Git icons: git.enable, renderer.icons.show.git and node has status
+---@param node Node
+---@return HighlightedString[]|nil modified icon
+function DecoratorGit:calculate_icons(node)
+  if not node or not self.enabled or not self.icons_by_xy then
+    return nil
+  end
+
+  local git_status = explorer_node.get_git_status(node)
+  if git_status == nil then
+    return nil
+  end
+
+  local inserted = {}
+  local iconss = {}
+
+  for _, s in pairs(git_status) do
+    local icons = self.icons_by_xy[s]
+    if not icons then
+      if self.hl_pos == HL_POSITION.none then
+        notify.warn(string.format("Unrecognized git state '%s'", git_status))
+      end
+      return nil
+    end
+
+    for _, icon in pairs(icons) do
+      if #icon.str > 0 then
+        if not inserted[icon] then
+          table.insert(iconss, icon)
+          inserted[icon] = true
+        end
+      end
+    end
+  end
+
+  if #iconss == 0 then
+    return nil
+  end
+
+  -- sort icons so it looks slightly better
+  table.sort(iconss, function(a, b)
+    return a.ord < b.ord
+  end)
+
+  return iconss
+end
+
+---Get the first icon as the sign if appropriate
+---@param node Node
+---@return string|nil name
+function DecoratorGit:sign_name(node)
+  if self.icon_placement ~= ICON_PLACEMENT.signcolumn then
+    return
+  end
+
+  local icons = self:calculate_icons(node)
+  if icons and #icons > 0 then
+    return icons[1].hl[1]
+  end
+end
+
+---Git highlight: git.enable, renderer.highlight_git and node has status
+---@param node Node
+---@return string|nil group
+function DecoratorGit:calculate_highlight(node)
+  if not node or not self.enabled or self.hl_pos == HL_POSITION.none then
+    return nil
+  end
+
+  local git_status = explorer_node.get_git_status(node)
+  if not git_status then
+    return nil
+  end
+
+  if node.nodes then
+    return self.folder_hl[git_status[1]]
+  else
+    return self.file_hl[git_status[1]]
+  end
+end
+
+return DecoratorGit

lua/nvim-tree/renderer/decorator/init.lua

@@ -0,0 +1,122 @@
+local HL_POSITION = require("nvim-tree.enum").HL_POSITION
+local ICON_PLACEMENT = require("nvim-tree.enum").ICON_PLACEMENT
+
+---@class Decorator
+---@field protected enabled boolean
+---@field protected hl_pos HL_POSITION
+---@field protected icon_placement ICON_PLACEMENT
+local Decorator = {}
+
+---@param o Decorator|nil
+---@return Decorator
+function Decorator:new(o)
+  o = o or {}
+  setmetatable(o, self)
+  self.__index = self
+
+  return o
+end
+
+---Maybe highlight groups
+---@param node Node
+---@return string|nil icon highlight group
+---@return string|nil name highlight group
+function Decorator:groups_icon_name(node)
+  local icon_hl, name_hl
+
+  if self.enabled and self.hl_pos ~= HL_POSITION.none then
+    local hl = self:calculate_highlight(node)
+
+    if self.hl_pos == HL_POSITION.all or self.hl_pos == HL_POSITION.icon then
+      icon_hl = hl
+    end
+    if self.hl_pos == HL_POSITION.all or self.hl_pos == HL_POSITION.name then
+      name_hl = hl
+    end
+  end
+
+  return icon_hl, name_hl
+end
+
+---Maybe icon sign
+---@param node Node
+---@return string|nil name
+function Decorator:sign_name(node)
+  if not self.enabled or self.icon_placement ~= ICON_PLACEMENT.signcolumn then
+    return
+  end
+
+  local icons = self:calculate_icons(node)
+  if icons and #icons > 0 then
+    return icons[1].hl[1]
+  end
+end
+
+---Icons when ICON_PLACEMENT.before
+---@param node Node
+---@return HighlightedString[]|nil icons
+function Decorator:icons_before(node)
+  if not self.enabled or self.icon_placement ~= ICON_PLACEMENT.before then
+    return
+  end
+
+  return self:calculate_icons(node)
+end
+
+---Icons when ICON_PLACEMENT.after
+---@param node Node
+---@return HighlightedString[]|nil icons
+function Decorator:icons_after(node)
+  if not self.enabled or self.icon_placement ~= ICON_PLACEMENT.after then
+    return
+  end
+
+  return self:calculate_icons(node)
+end
+
+---Maybe icons, optionally implemented
+---@protected
+---@param _ Node
+---@return HighlightedString[]|nil icons
+function Decorator:calculate_icons(_)
+  return nil
+end
+
+---Maybe highlight group, optionally implemented
+---@protected
+---@param _ Node
+---@return string|nil group
+function Decorator:calculate_highlight(_)
+  return nil
+end
+
+---Define a sign
+---@protected
+---@param icon HighlightedString|nil
+function Decorator:define_sign(icon)
+  if icon and #icon.hl > 0 then
+    local name = icon.hl[1]
+
+    if not vim.tbl_isempty(vim.fn.sign_getdefined(name)) then
+      vim.fn.sign_undefine(name)
+    end
+
+    -- don't use sign if not defined
+    if #icon.str < 1 then
+      self.icon_placement = ICON_PLACEMENT.none
+      return
+    end
+
+    -- byte index of the next character, allowing for wide
+    local bi = vim.fn.byteidx(icon.str, 1)
+
+    -- first (wide) character, falls back to empty string
+    local text = string.sub(icon.str, 1, bi)
+    vim.fn.sign_define(name, {
+      text = text,
+      texthl = name,
+    })
+  end
+end
+
+return Decorator

lua/nvim-tree/renderer/decorator/modified.lua

@@ -0,0 +1,61 @@
+local buffers = require "nvim-tree.buffers"
+
+local HL_POSITION = require("nvim-tree.enum").HL_POSITION
+local ICON_PLACEMENT = require("nvim-tree.enum").ICON_PLACEMENT
+
+local Decorator = require "nvim-tree.renderer.decorator"
+
+---@class DecoratorModified: Decorator
+---@field icon HighlightedString|nil
+local DecoratorModified = Decorator:new()
+
+---@param opts table
+---@return DecoratorModified
+function DecoratorModified:new(opts)
+  local o = Decorator.new(self, {
+    enabled = opts.modified.enable,
+    hl_pos = HL_POSITION[opts.renderer.highlight_modified] or HL_POSITION.none,
+    icon_placement = ICON_PLACEMENT[opts.renderer.icons.modified_placement] or ICON_PLACEMENT.none,
+  })
+  ---@cast o DecoratorModified
+
+  if not o.enabled then
+    return o
+  end
+
+  if opts.renderer.icons.show.modified then
+    o.icon = {
+      str = opts.renderer.icons.glyphs.modified,
+      hl = { "NvimTreeModifiedIcon" },
+    }
+    o:define_sign(o.icon)
+  end
+
+  return o
+end
+
+---Modified icon: modified.enable, renderer.icons.show.modified and node is modified
+---@param node Node
+---@return HighlightedString[]|nil icons
+function DecoratorModified:calculate_icons(node)
+  if self.enabled and buffers.is_modified(node) then
+    return { self.icon }
+  end
+end
+
+---Modified highlight: modified.enable, renderer.highlight_modified and node is modified
+---@param node Node
+---@return string|nil group
+function DecoratorModified:calculate_highlight(node)
+  if not self.enabled or self.hl_pos == HL_POSITION.none or not buffers.is_modified(node) then
+    return nil
+  end
+
+  if node.nodes then
+    return "NvimTreeModifiedFolderHL"
+  else
+    return "NvimTreeModifiedFileHL"
+  end
+end
+
+return DecoratorModified

lua/nvim-tree/renderer/decorator/opened.lua

@@ -0,0 +1,35 @@
+local buffers = require "nvim-tree.buffers"
+
+local HL_POSITION = require("nvim-tree.enum").HL_POSITION
+local ICON_PLACEMENT = require("nvim-tree.enum").ICON_PLACEMENT
+
+local Decorator = require "nvim-tree.renderer.decorator"
+
+---@class DecoratorOpened: Decorator
+---@field enabled boolean
+---@field icon HighlightedString|nil
+local DecoratorOpened = Decorator:new()
+
+---@param opts table
+---@return DecoratorOpened
+function DecoratorOpened:new(opts)
+  local o = Decorator.new(self, {
+    enabled = true,
+    hl_pos = HL_POSITION[opts.renderer.highlight_opened_files] or HL_POSITION.none,
+    icon_placement = ICON_PLACEMENT.none,
+  })
+  ---@cast o DecoratorOpened
+
+  return o
+end
+
+---Opened highlight: renderer.highlight_opened_files and node has an open buffer
+---@param node Node
+---@return string|nil group
+function DecoratorOpened:calculate_highlight(node)
+  if self.hl_pos ~= HL_POSITION.none and buffers.is_opened(node) then
+    return "NvimTreeOpenedHL"
+  end
+end
+
+return DecoratorOpened

lua/nvim-tree/renderer/init.lua

@@ -1,34 +1,32 @@
+local appearance = require "nvim-tree.appearance"
 local core = require "nvim-tree.core"
 local log = require "nvim-tree.log"
 local view = require "nvim-tree.view"
 local events = require "nvim-tree.events"
-local modified = require "nvim-tree.renderer.components.modified"
 
 local _padding = require "nvim-tree.renderer.components.padding"
 local icon_component = require "nvim-tree.renderer.components.icons"
 local full_name = require "nvim-tree.renderer.components.full-name"
-local git = require "nvim-tree.renderer.components.git"
-local diagnostics = require "nvim-tree.renderer.components.diagnostics"
 local Builder = require "nvim-tree.renderer.builder"
-local live_filter = require "nvim-tree.live-filter"
-local bookmarks = require "nvim-tree.renderer.components.bookmarks"
 
 local M = {
-  last_highlights = {},
+  last_hl_args = {},
 }
 
 local SIGN_GROUP = "NvimTreeRendererSigns"
 
-local namespace_id = vim.api.nvim_create_namespace "NvimTreeHighlights"
-
-local function _draw(bufnr, lines, hl, signs)
+---@param bufnr number
+---@param lines string[]
+---@param hl_args AddHighlightArgs[]
+---@param signs string[]
+local function _draw(bufnr, lines, hl_args, signs)
   vim.api.nvim_buf_set_option(bufnr, "modifiable", true)
   vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, lines)
-  M.render_hl(bufnr, hl)
+  M.render_hl(bufnr, hl_args)
   vim.api.nvim_buf_set_option(bufnr, "modifiable", false)
   vim.fn.sign_unplace(SIGN_GROUP)
-  for _, sign in pairs(signs) do
-    vim.fn.sign_place(0, SIGN_GROUP, sign.sign, bufnr, { lnum = sign.lnum, priority = sign.priority })
+  for i, sign_name in pairs(signs) do
+    vim.fn.sign_place(0, SIGN_GROUP, sign_name, bufnr, { lnum = i + 1 })
   end
 end
 
@@ -36,26 +34,17 @@ function M.render_hl(bufnr, hl)
   if not bufnr or not vim.api.nvim_buf_is_loaded(bufnr) then
     return
   end
-  vim.api.nvim_buf_clear_namespace(bufnr, namespace_id, 0, -1)
-  for _, data in ipairs(hl or M.last_highlights) do
+  vim.api.nvim_buf_clear_namespace(bufnr, appearance.NS_ID, 0, -1)
+  for _, data in ipairs(hl or M.last_hl_args) do
     if type(data[1]) == "table" then
       for _, group in ipairs(data[1]) do
-        vim.api.nvim_buf_add_highlight(bufnr, namespace_id, group, data[2], data[3], data[4])
+        vim.api.nvim_buf_add_highlight(bufnr, appearance.NS_ID, group, data[2], data[3], data[4])
       end
     end
   end
 end
 
-local picture_map = {
-  jpg = true,
-  jpeg = true,
-  png = true,
-  gif = true,
-  webp = true,
-  jxl = true,
-}
-
-function M.draw(unloaded_bufnr)
+function M.draw()
   local bufnr = view.get_bufnr()
   if not core.get_explorer() or not bufnr or not vim.api.nvim_buf_is_loaded(bufnr) then
     return
@@ -66,30 +55,13 @@ function M.draw(unloaded_bufnr)
   local cursor = vim.api.nvim_win_get_cursor(view.get_winnr())
   icon_component.reset_config()
 
-  local lines, hl, signs = Builder.new(core.get_cwd())
-    :configure_root_label(M.config.root_folder_label)
-    :configure_trailing_slash(M.config.add_trailing)
-    :configure_special_files(M.config.special_files)
-    :configure_picture_map(picture_map)
-    :configure_opened_file_highlighting(M.config.highlight_opened_files)
-    :configure_modified_highlighting(M.config.highlight_modified)
-    :configure_icon_padding(M.config.icons.padding)
-    :configure_git_icons_placement(M.config.icons.git_placement)
-    :configure_diagnostics_icon_placement(M.config.icons.diagnostics_placement)
-    :configure_bookmark_icon_placement(M.config.icons.bookmarks_placement)
-    :configure_modified_placement(M.config.icons.modified_placement)
-    :configure_symlink_destination(M.config.symlink_destination)
-    :configure_filter(live_filter.filter, live_filter.prefix)
-    :configure_group_name_modifier(M.config.group_empty)
-    :build_header(view.is_root_folder_visible(core.get_cwd()))
-    :build(core.get_explorer(), unloaded_bufnr)
-    :unwrap()
+  local builder = Builder:new():build()
 
-  _draw(bufnr, lines, hl, signs)
+  _draw(bufnr, builder.lines, builder.hl_args, builder.signs)
 
-  M.last_highlights = hl
+  M.last_hl_args = builder.hl_args
 
-  if cursor and #lines >= cursor[1] then
+  if cursor and #builder.lines >= cursor[1] then
     vim.api.nvim_win_set_cursor(view.get_winnr(), cursor)
   end
 
@@ -102,15 +74,12 @@ end
 
 function M.setup(opts)
   M.config = opts.renderer
-  M.config.modified = opts.modified
 
   _padding.setup(opts)
   full_name.setup(opts)
-  git.setup(opts)
-  modified.setup(opts)
-  diagnostics.setup(opts)
-  bookmarks.setup(opts)
   icon_component.setup(opts)
+
+  Builder.setup(opts)
 end
 
 return M