[vim] Ensure backup, swap, and undo directories exist so those state files are placed correctly

config/nvim/init.lua

@@ -5,6 +5,7 @@ vim.cmd [[ source ~/.vimrc.common ]]
 
 require 'configuration'
 require 'keys'
+require 'os'
 
 vim.cmd [[ source ~/.vim/plugins.vim ]]
 
@@ -16,9 +17,9 @@ function ensure_metadata_directories_exist()
     }
 
     for _, opt in ipairs(paths) do
-        local first_path = opt[1]
-        if string.find(first_path, "//$") then
-            os.execute("mkdir -p " .. first_path)
+        local firstPath = opt[1]
+        if string.find(firstPath, "//$") then
+            os.execute("mkdir", "-p", firstPath)
         end
     end
 end

vimrc

@@ -3,6 +3,7 @@
 
 source ~/.vimrc.common
 
+if !has('nvim')
     set nocompatible        " use enhanced vim features
 
     let s:localdir=expand("~/.local/vim")
@@ -23,4 +24,4 @@ let &viminfofile=expand(s:localdir . "/viminfo")
     "   :   maximum number of lines of command history to save
     "   s   shada entries over 100 KiB are skipped
     set viminfo=%100,'100,h,<1000,:100,s100
-
+endif