Trying to get vimpager (to replace less) working with nerdTREE

Question

I'm trying to get switch over to vim as my primary editor and I've installed the nerdTree plugin, but now when I try and use vimpager to replace less I get

Error detected while processing VimEnter Auto commands for "*":
E492: Not an editor command: NERDTree  

I've narrowed it down to this line in my .vimrc, but I don't know much about configuring vim, I got this .vimrc off the internet.

autocmd VimEnter * NERDTree 

My best guess is that vimpager is trying to disable plugin, but the .vimrc is trying to load it, so they're getting an error.

Any advise on resolving this?

Answer 1

The correct fix is to move

autocmd VimEnter * NERDTree

out of your ~/.vimrc and into ~/.vim/after/plugin/NERD_tree.vim.

That way, the autocmd only gets run if NERD_tree has also been loaded.

And to be more correct, you should probably make it

if exists("loaded_nerd_tree")
    echo 'loaded_nerd_tree' . loaded_nerd_tree
endif

that way if the plugin is uninstalled, your after script won't still try to use the plugin.