refactor: use lua api for user commands and autocommands (#1206)

BREAKING: plugin now requires nvim-0.7

lua/nvim-tree/actions/file-popup.lua

@@ -72,11 +72,10 @@ function M.toggle_file_info(node)
 
   setup_window(node)
 
-  vim.cmd [[
-    augroup NvimTreeRemoveFilePopup
-      au CursorMoved * lua require'nvim-tree.actions.file-popup'.close_popup()
-    augroup END
-  ]]
+  a.nvim_create_autocmd("CursorMoved", {
+    group = a.nvim_create_augroup("NvimTreeRemoveFilePopup", {}),
+    callback = M.close_popup,
+  })
 end
 
 return M

lua/nvim-tree/actions/open-file.lua

@@ -257,13 +257,15 @@ function M.fn(mode, filename)
   if mode == "preview" then
     if not buf_loaded then
       vim.bo.bufhidden = "delete"
-      vim.cmd [[
-      augroup RemoveBufHidden
-          autocmd!
-          autocmd TextChanged <buffer> setlocal bufhidden= | autocmd! RemoveBufHidden
-          autocmd TextChangedI <buffer> setlocal bufhidden= | autocmd! RemoveBufHidden
-      augroup end
-    ]]
+
+      api.nvim_create_autocmd({ "TextChanged", "TextChangedI" }, {
+        group = api.nvim_create_augroup("RemoveBufHidden", {}),
+        buffer = api.nvim_get_current_buf(),
+        callback = function()
+          vim.bo.bufhidden = ""
+        end,
+        once = true,
+      })
     end
     view.focus()
     return