Feat/icon highlighting for opened files and directories (#258)

doc/nvim-tree-lua.txt

@@ -95,6 +95,11 @@ to render the icons. The `icons` key can only work if `nvim-web-devicons`
 is installed and in your |runtimepath|
 (https://github.com/kyazdani42/nvim-web-devicons)
 
+|g:nvim_tree_highlight_opened_files|			        *g:nvim_tree_highlight_opened_files*
+
+Can be `0` or `1`. When `1`, will highlight icons for opened files and directories
+Default is 0
+
 |g:nvim_tree_icons|                                *g:nvim_tree_icons*
 
 You can set icons for:
@@ -361,7 +366,9 @@ NvimTreeFolderName
 NvimTreeRootFolder
 NvimTreeFolderIcon
 NvimTreeEmptyFolderName
+NvimTreeOpenedFolderName
 NvimTreeExecFile
+NvimTreeOpenedFile
 NvimTreeSpecialFile
 NvimTreeImageFile
 NvimTreeMarkdownFile

lua/nvim-tree/colors.lua

@@ -39,6 +39,7 @@ local function get_hl_groups()
     ExecFile = { gui = 'bold', fg = colors.green },
     SpecialFile = { gui = 'bold,underline', fg = colors.yellow },
     ImageFile = { gui = 'bold', fg = colors.purple },
+    OpenedFile = { gui = 'bold', fg = colors.green },
 
     GitDirty = { fg = colors.dark_red },
     GitDeleted = { fg = colors.dark_red },
@@ -53,6 +54,7 @@ local function get_links()
   return {
     FolderName = 'Directory',
     EmptyFolderName = 'Directory',
+    OpenedFolderName = 'Directory',
     Normal = 'Normal',
     EndOfBuffer = 'EndOfBuffer',
     CursorLine = 'CursorLine',

lua/nvim-tree/lib.lua

@@ -274,6 +274,8 @@ function M.open_file(mode, filename)
   if vim.g.nvim_tree_quit_on_open == 1 and mode ~= 'preview' then
     M.close()
   end
+
+  renderer.draw(M.Tree, true)
 end
 
 function M.change_dir(foldername)

lua/nvim-tree/renderer.lua

@@ -261,6 +261,7 @@ local function update_draw_data(tree, depth, markers)
         next = next.group_next
       end
       if not has_children then folder_hl = "NvimTreeEmptyFolderName" end
+      if node.open then folder_hl = "NvimTreeOpenedFolderName" end
       set_folder_hl(index, offset, #icon, #name+#git_icon, folder_hl)
       if git_hl then
         set_folder_hl(index, offset, #icon, #name+#git_icon, git_hl)
@@ -298,6 +299,12 @@ local function update_draw_data(tree, depth, markers)
         table.insert(hl, {'NvimTreeImageFile', index, offset+#icon+#git_icons, -1 })
       end
 
+      if vim.g.nvim_tree_highlight_opened_files then
+        if vim.fn.bufloaded(node.absolute_path) > 0 then
+          table.insert(hl, {'NvimTreeOpenedFile', index, offset, offset+#icon })
+        end
+      end
+
       if git_hl then
         table.insert(hl, {git_hl, index, offset+#icon+#git_icons, -1 })
       end