feat(#2316): add NvimTreeFolderArrowClosed NvimTreeFolderArrowOpen (#2408)

doc/nvim-tree-lua.txt

@@ -2142,6 +2142,8 @@ Icon: >
     NvimTreeOpenedFolderIcon    NvimTreeFolderIcon
     NvimTreeClosedFolderIcon    NvimTreeFolderIcon
     NvimTreeBookmark
+    NvimTreeFolderArrowClosed   NvimTreeIndentMarker
+    NvimTreeFolderArrowOpen     NvimTreeIndentMarker
 <
 Indent: >
     NvimTreeIndentMarker

lua/nvim-tree/renderer/builder.lua

@@ -290,14 +290,15 @@ function Builder:_get_highlight_override(node, unloaded_bufnr)
   return icon_hl, name_hl
 end
 
----@param padding HighlightedString
+---@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
 ---@return HighlightedString[]
-function Builder:_format_line(padding, icon, name, git_icons, diagnostics_icon, modified_icon)
+function Builder:_format_line(indent_markers, arrows, icon, name, git_icons, diagnostics_icon, modified_icon)
   local added_len = 0
   local function add_to_end(t1, t2)
     for _, v in ipairs(t2) do
@@ -315,7 +316,7 @@ function Builder:_format_line(padding, icon, name, git_icons, diagnostics_icon,
     end
   end
 
-  local line = { padding }
+  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)
@@ -344,7 +345,8 @@ end
 
 function Builder:_build_line(node, idx, num_children, unloaded_bufnr)
   -- various components
-  local padding = pad.get_padding(self.depth, idx, num_children, node, self.markers)
+  local indent_markers = pad.get_indent_markers(self.depth, idx, num_children, node, self.markers)
+  local arrows = pad.get_arrows(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)
@@ -370,7 +372,7 @@ function Builder:_build_line(node, idx, num_children, unloaded_bufnr)
     name.hl = name_hl
   end
 
-  local line = self:_format_line(padding, icon, name, git_icons, diagnostics_icon, modified_icon)
+  local line = self:_format_line(indent_markers, arrows, icon, name, git_icons, diagnostics_icon, modified_icon)
   self:_insert_line(self:_unwrap_highlighted_strings(line))
 
   self.index = self.index + 1

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

@@ -58,24 +58,14 @@ local function get_padding_indent_markers(depth, idx, nodes_number, markers, wit
   return padding
 end
 
-local function get_padding_arrows(node, indent)
-  if node.nodes then
-    return M.config.icons.glyphs.folder[node.open and "arrow_open" or "arrow_closed"] .. " "
-  elseif indent then
-    return "  "
-  else
-    return ""
-  end
-end
-
 ---@param depth integer
 ---@param idx integer
 ---@param nodes_number integer
 ---@param node table
 ---@param markers table
----@return HighlightedString
-function M.get_padding(depth, idx, nodes_number, node, markers)
-  local padding = ""
+---@return HighlightedString[]
+function M.get_indent_markers(depth, idx, nodes_number, node, markers)
+  local str = ""
 
   local show_arrows = M.config.icons.show.folder_arrow
   local show_markers = M.config.indent_markers.enable
@@ -83,16 +73,38 @@ function M.get_padding(depth, idx, nodes_number, node, markers)
   local indent_width = M.config.indent_width
 
   if show_markers then
-    padding = padding .. get_padding_indent_markers(depth, idx, nodes_number, markers, show_arrows, inline_arrows, node)
+    str = str .. get_padding_indent_markers(depth, idx, nodes_number, markers, show_arrows, inline_arrows, node)
   else
-    padding = padding .. string.rep(" ", depth * indent_width)
+    str = str .. string.rep(" ", depth * indent_width)
   end
 
-  if show_arrows then
-    padding = padding .. get_padding_arrows(node, not show_markers)
+  return { str = str, hl = "NvimTreeIndentMarker" }
+end
+
+---@param node table
+---@return HighlightedString[]|nil
+function M.get_arrows(node)
+  if not M.config.icons.show.folder_arrow then
+    return
   end
 
-  return { str = padding, hl = "NvimTreeIndentMarker" }
+  local str
+  local hl = "NvimTreeFolderArrowClosed"
+
+  if node.nodes then
+    if node.open then
+      str = M.config.icons.glyphs.folder["arrow_open"] .. " "
+      hl = "NvimTreeFolderArrowOpen"
+    else
+      str = M.config.icons.glyphs.folder["arrow_closed"] .. " "
+    end
+  elseif M.config.indent_markers.enable then
+    str = ""
+  else
+    str = "  "
+  end
+
+  return { str = str, hl = hl }
 end
 
 function M.setup(opts)