feat(cache): automatically reset topmods when a user changes a file for a path on the rtp

lua/lazy/core/cache.lua

@@ -369,9 +369,19 @@ function M.enable()
       break
     end
   end
-  -- TODO: add an autocmd on BufWritePost that checks if its in a /lua folder
-  -- if thats the case, then reset the plugin path.
-  -- This will make sure we can properly load new top-level lua modules
+
+  -- this will reset the top-mods in case someone adds a new
+  -- top-level lua module to a path already on the rtp
+  vim.api.nvim_create_autocmd("BufWritePost", {
+    group = vim.api.nvim_create_augroup("cache_topmods_reset", { clear = true }),
+    callback = function(event)
+      local bufname = event.match ---@type string
+      local idx = bufname:find("/lua/", 1, true)
+      if idx then
+        M.reset(bufname:sub(1, idx - 1))
+      end
+    end,
+  })
 end
 
 --- Disables the cache:
@@ -391,6 +401,7 @@ function M.disable()
     end
   end
   table.insert(package.loaders, 2, vim._load_package)
+  vim.api.nvim_del_augroup_by_name("cache_topmods_reset")
 end
 
 --- Return the top-level `/lua/*` modules for this path