Improve icon fetching by file extension (#423)

lua/nvim-tree/populate.lua

@@ -46,7 +46,7 @@ local function file_new(cwd, name)
     name = name,
     absolute_path = absolute_path,
     executable = is_exec,
-    extension = vim.fn.fnamemodify(name, ':e') or "",
+    extension = string.match(name, ".?[^.]+%.(.*)") or "",
     match_name = path_to_matching_str(name),
     match_path = path_to_matching_str(absolute_path),
   }

lua/nvim-tree/renderer.lua

@@ -58,11 +58,14 @@ if icon_state.show_file_icon then
   get_file_icon = function(fname, extension, line, depth)
     local icon, hl_group = web_devicons.get_icon(fname, extension)
 
-    if icon then
+    if icon and hl_group ~= "DevIconDefault" then
       if hl_group then
         table.insert(hl, { hl_group, line, depth, depth + #icon + 1 })
       end
       return icon.." "
+    elseif string.match(extension, "%.(.*)") then
+      -- If there are more extensions to the file, try to grab the icon for them recursively
+      return get_file_icon(fname, string.match(extension, "%.(.*)"), line, depth)
     else
       return #icon_state.icons.default > 0 and icon_state.icons.default.." " or ""
     end