diary: create year folder if missing

lua/diary.lua

@@ -1,10 +1,12 @@
 local diary_open = function(opts)
   local date = opts.args ~= '' and opts.args or os.date('%Y-%m-%d')
   local year, month = date:match('(%d%d%d%d)-(%d%d)')
-  local file = string.format('~/.diary/asciidoc/%s/diary-%s-%s.adoc', year, year, month)
+  local folder = string.format('~/.diary/asciidoc/%s', year)
+  vim.fn.mkdir(folder, "p")
+  local file = string.format('%s/diary-%s-%s.adoc', folder, year, month)
   print("file is:", file)
   vim.cmd('e ' .. file)
-  vim.cmd('normal! G')
+  vim.cmd('normal! G') -- go to end of file
 
   -- NOTE.2025-06-08 [1] and [2] should be replaced with snippet name, but I
   -- don't know how -- neither do grok nor chatgpt ...