feat(#2948): add UserDecorator, proof of concept

lua/nvim-tree.lua

@@ -276,6 +276,7 @@ local DEFAULT_OPTS = { -- BEGIN_DEFAULT_OPTS
     },
   },
   renderer = {
+    user_decorators = {},
     add_trailing = false,
     group_empty = false,
     full_name = false,

lua/nvim-tree/renderer/builder.lua

@@ -13,12 +13,14 @@ local DecoratorGit = require("nvim-tree.renderer.decorator.git")
 local DecoratorModified = require("nvim-tree.renderer.decorator.modified")
 local DecoratorHidden = require("nvim-tree.renderer.decorator.hidden")
 local DecoratorOpened = require("nvim-tree.renderer.decorator.opened")
+local UserDecoratorExample = require("nvim-tree.renderer.decorator.example")
 
 local pad = require("nvim-tree.renderer.components.padding")
 
----@class (exact) HighlightedString
----@field str string
----@field hl string[]
+----TODO move all these classes to API meta
+----@class (exact) HighlightedString
+----@field str string
+----@field hl string[]
 
 ---@class (exact) AddHighlightArgs
 ---@field group string[]
@@ -62,16 +64,20 @@ function Builder:new(args)
   self.virtual_lines   = {}
   self.decorators      = {
     -- priority order
-    DecoratorCut({ explorer = args.explorer }),
-    DecoratorCopied({ explorer = args.explorer }),
-    DecoratorDiagnostics({ explorer = args.explorer }),
-    DecoratorBookmarks({ explorer = args.explorer }),
-    DecoratorModified({ explorer = args.explorer }),
-    DecoratorHidden({ explorer = args.explorer }),
-    DecoratorOpened({ explorer = args.explorer }),
-    DecoratorGit({ explorer = args.explorer })
+    DecoratorCut(self.explorer),
+    DecoratorCopied(self.explorer),
+    DecoratorDiagnostics(self.explorer),
+    DecoratorBookmarks(self.explorer),
+    DecoratorModified(self.explorer),
+    DecoratorHidden(self.explorer),
+    DecoratorOpened(self.explorer),
+    DecoratorGit(self.explorer),
   }
   self.hidden_display  = Builder:setup_hidden_display_function(self.explorer.opts)
+
+  for _, user_decorator in ipairs(args.explorer.opts.renderer.user_decorators) do
+    table.insert(self.decorators, user_decorator.class())
+  end
 end
 
 ---Insert ranged highlight groups into self.highlights

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

@@ -1,20 +1,22 @@
 local Decorator = require("nvim-tree.renderer.decorator")
 
 ---@class (exact) DecoratorBookmarks: Decorator
----@field icon HighlightedString?
+---@field private explorer Explorer
+---@field private icon HighlightedString?
 local DecoratorBookmarks = Decorator:extend()
 
 ---@class DecoratorBookmarks
----@overload fun(explorer: DecoratorArgs): DecoratorBookmarks
+---@overload fun(explorer: Explorer): DecoratorBookmarks
 
 ---@protected
----@param args DecoratorArgs
-function DecoratorBookmarks:new(args)
-  Decorator.new(self, {
-    explorer       = args.explorer,
+---@param explorer Explorer
+function DecoratorBookmarks:new(explorer)
+  self.explorer = explorer
+
+  DecoratorBookmarks.super.new(self, {
     enabled        = true,
-    hl_pos         = args.explorer.opts.renderer.highlight_bookmarks or "none",
-    icon_placement = args.explorer.opts.renderer.icons.bookmarks_placement or "none",
+    hl_pos         = self.explorer.opts.renderer.highlight_bookmarks or "none",
+    icon_placement = self.explorer.opts.renderer.icons.bookmarks_placement or "none",
   })
 
   if self.explorer.opts.renderer.icons.show.bookmarks then

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

@@ -1,18 +1,20 @@
 local Decorator = require("nvim-tree.renderer.decorator")
 
 ---@class (exact) DecoratorCopied: Decorator
+---@field private explorer Explorer
 local DecoratorCopied = Decorator:extend()
 
 ---@class DecoratorCopied
----@overload fun(explorer: DecoratorArgs): DecoratorCopied
+---@overload fun(explorer: Explorer): DecoratorCopied
 
 ---@protected
----@param args DecoratorArgs
-function DecoratorCopied:new(args)
-  Decorator.new(self, {
-    explorer       = args.explorer,
+---@param explorer Explorer
+function DecoratorCopied:new(explorer)
+  self.explorer = explorer
+
+  DecoratorCopied.super.new(self, {
     enabled        = true,
-    hl_pos         = args.explorer.opts.renderer.highlight_clipboard or "none",
+    hl_pos         = self.explorer.opts.renderer.highlight_clipboard or "none",
     icon_placement = "none",
   })
 end

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

@@ -1,18 +1,20 @@
 local Decorator = require("nvim-tree.renderer.decorator")
 
 ---@class (exact) DecoratorCut: Decorator
+---@field private explorer Explorer
 local DecoratorCut = Decorator:extend()
 
 ---@class DecoratorCut
----@overload fun(explorer: DecoratorArgs): DecoratorCut
+---@overload fun(explorer: Explorer): DecoratorCut
 
 ---@protected
----@param args DecoratorArgs
-function DecoratorCut:new(args)
-  Decorator.new(self, {
-    explorer       = args.explorer,
+---@param explorer Explorer
+function DecoratorCut:new(explorer)
+  self.explorer = explorer
+
+  DecoratorCut.super.new(self, {
     enabled        = true,
-    hl_pos         = args.explorer.opts.renderer.highlight_clipboard or "none",
+    hl_pos         = self.explorer.opts.renderer.highlight_clipboard or "none",
     icon_placement = "none",
   })
 end

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

@@ -31,20 +31,22 @@ local ICON_KEYS = {
 }
 
 ---@class (exact) DecoratorDiagnostics: Decorator
----@field icons HighlightedString[]?
+---@field private explorer Explorer
+---@field private icons HighlightedString[]?
 local DecoratorDiagnostics = Decorator:extend()
 
 ---@class DecoratorDiagnostics
----@overload fun(explorer: DecoratorArgs): DecoratorDiagnostics
+---@overload fun(explorer: Explorer): DecoratorDiagnostics
 
 ---@protected
----@param args DecoratorArgs
-function DecoratorDiagnostics:new(args)
-  Decorator.new(self, {
-    explorer       = args.explorer,
+---@param explorer Explorer
+function DecoratorDiagnostics:new(explorer)
+  self.explorer = explorer
+
+  DecoratorDiagnostics.super.new(self, {
     enabled        = true,
-    hl_pos         = args.explorer.opts.renderer.highlight_diagnostics or "none",
-    icon_placement = args.explorer.opts.renderer.icons.diagnostics_placement or "none",
+    hl_pos         = self.explorer.opts.renderer.highlight_diagnostics or "none",
+    icon_placement = self.explorer.opts.renderer.icons.diagnostics_placement or "none",
   })
 
   if not self.enabled then

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

@@ -13,23 +13,25 @@ local DirectoryNode = require("nvim-tree.node.directory")
 ---@alias GitGlyphsByStatus table<GitStatusStrings, string> from opts
 
 ---@class (exact) DecoratorGit: Decorator
----@field file_hl_by_xy table<GitXY, string>?
----@field folder_hl_by_xy table<GitXY, string>?
----@field icons_by_status GitIconsByStatus?
----@field icons_by_xy GitIconsByXY?
+---@field private explorer Explorer
+---@field private file_hl_by_xy table<GitXY, string>?
+---@field private folder_hl_by_xy table<GitXY, string>?
+---@field private icons_by_status GitIconsByStatus?
+---@field private icons_by_xy GitIconsByXY?
 local DecoratorGit = Decorator:extend()
 
 ---@class DecoratorGit
----@overload fun(explorer: DecoratorArgs): DecoratorGit
+---@overload fun(explorer: Explorer): DecoratorGit
 
 ---@protected
----@param args DecoratorArgs
-function DecoratorGit:new(args)
-  Decorator.new(self, {
-    explorer       = args.explorer,
-    enabled        = args.explorer.opts.git.enable,
-    hl_pos         = args.explorer.opts.renderer.highlight_git or "none",
-    icon_placement = args.explorer.opts.renderer.icons.git_placement or "none",
+---@param explorer Explorer
+function DecoratorGit:new(explorer)
+  self.explorer = explorer
+
+  DecoratorGit.super.new(self, {
+    enabled        = self.explorer.opts.git.enable,
+    hl_pos         = self.explorer.opts.renderer.highlight_git or "none",
+    icon_placement = self.explorer.opts.renderer.icons.git_placement or "none",
   })
 
   if not self.enabled then

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

@@ -2,20 +2,22 @@ local Decorator = require("nvim-tree.renderer.decorator")
 local DirectoryNode = require("nvim-tree.node.directory")
 
 ---@class (exact) DecoratorHidden: Decorator
----@field icon HighlightedString?
+---@field private explorer Explorer
+---@field private icon HighlightedString?
 local DecoratorHidden = Decorator:extend()
 
 ---@class DecoratorHidden
----@overload fun(explorer: DecoratorArgs): DecoratorHidden
+---@overload fun(explorer: Explorer): DecoratorHidden
 
 ---@protected
----@param args DecoratorArgs
-function DecoratorHidden:new(args)
-  Decorator.new(self, {
-    explorer       = args.explorer,
+---@param explorer Explorer
+function DecoratorHidden:new(explorer)
+  self.explorer = explorer
+
+  DecoratorHidden.super.new(self, {
     enabled        = true,
-    hl_pos         = args.explorer.opts.renderer.highlight_hidden or "none",
-    icon_placement = args.explorer.opts.renderer.icons.hidden_placement or "none",
+    hl_pos         = self.explorer.opts.renderer.highlight_hidden or "none",
+    icon_placement = self.explorer.opts.renderer.icons.hidden_placement or "none",
   })
 
   if self.explorer.opts.renderer.icons.show.hidden then

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

@@ -4,26 +4,20 @@ local Class = require("nvim-tree.classic")
 ---@alias DecoratorIconPlacement "none" | "before" | "after" | "signcolumn" | "right_align"
 
 ---Abstract Decorator
----Uses the factory pattern to instantiate child instances.
 ---@class (exact) Decorator: Class
----@field protected explorer Explorer
 ---@field protected enabled boolean
 ---@field protected range DecoratorRange
 ---@field protected icon_placement DecoratorIconPlacement
 local Decorator = Class:extend()
 
 ---@class (exact) DecoratorArgs
----@field explorer Explorer
-
----@class (exact) AbstractDecoratorArgs: DecoratorArgs
 ---@field enabled boolean
 ---@field hl_pos DecoratorRange
 ---@field icon_placement DecoratorIconPlacement
 
 ---@protected
----@param args AbstractDecoratorArgs
+---@param args DecoratorArgs
 function Decorator:new(args)
-  self.explorer       = args.explorer
   self.enabled        = args.enabled
   self.range          = args.hl_pos
   self.icon_placement = args.icon_placement

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

@@ -4,20 +4,22 @@ local Decorator = require("nvim-tree.renderer.decorator")
 local DirectoryNode = require("nvim-tree.node.directory")
 
 ---@class (exact) DecoratorModified: Decorator
----@field icon HighlightedString?
+---@field private explorer Explorer
+---@field private icon HighlightedString?
 local DecoratorModified = Decorator:extend()
 
 ---@class DecoratorModified
----@overload fun(explorer: DecoratorArgs): DecoratorModified
+---@overload fun(explorer: Explorer): DecoratorModified
 
 ---@protected
----@param args DecoratorArgs
-function DecoratorModified:new(args)
-  Decorator.new(self, {
-    explorer       = args.explorer,
+---@param explorer Explorer
+function DecoratorModified:new(explorer)
+  self.explorer = explorer
+
+  DecoratorModified.super.new(self, {
     enabled        = true,
-    hl_pos         = args.explorer.opts.renderer.highlight_modified or "none",
-    icon_placement = args.explorer.opts.renderer.icons.modified_placement or "none",
+    hl_pos         = self.explorer.opts.renderer.highlight_modified or "none",
+    icon_placement = self.explorer.opts.renderer.icons.modified_placement or "none",
   })
 
   if not self.enabled then

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

@@ -3,19 +3,21 @@ local buffers = require("nvim-tree.buffers")
 local Decorator = require("nvim-tree.renderer.decorator")
 
 ---@class (exact) DecoratorOpened: Decorator
----@field icon HighlightedString|nil
+---@field private explorer Explorer
+---@field private icon HighlightedString|nil
 local DecoratorOpened = Decorator:extend()
 
 ---@class DecoratorOpened
----@overload fun(explorer: DecoratorArgs): DecoratorOpened
+---@overload fun(explorer: Explorer): DecoratorOpened
 
 ---@protected
----@param args DecoratorArgs
-function DecoratorOpened:new(args)
-  Decorator.new(self, {
-    explorer       = args.explorer,
+---@param explorer Explorer
+function DecoratorOpened:new(explorer)
+  self.explorer = explorer
+
+  DecoratorOpened.super.new(self, {
     enabled        = true,
-    hl_pos         = args.explorer.opts.renderer.highlight_opened_files or "none",
+    hl_pos         = self.explorer.opts.renderer.highlight_opened_files or "none",
     icon_placement = "none",
   })
 end

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

@@ -0,0 +1,16 @@
+local Decorator = require("nvim-tree.renderer.decorator")
+
+---Marker parent for user decorators
+---@class (exact) UserDecorator: Decorator
+local UserDecorator = Decorator:extend()
+
+---@class UserDecorator
+---@overload fun(args: DecoratorArgs): UserDecorator
+
+---@protected
+---@param args DecoratorArgs
+function UserDecorator:new(args)
+  UserDecorator.super.new(self, args)
+end
+
+return UserDecorator