Why files in `~/.config/nvim/after/ftplugin/` are not taken into acount?

Question

My neovim doesn't load file type plugins when loading a ruby/eruby file. Here is the corresponding configuration files:

for f in ~/.config/nvim/after/ftplugin/* ; do echo "# $f" ; cat $f; done
# /home/psychoslave/.config/nvim/after/ftplugin/erb.vim
" Turn off vi compatibility
set nocompatible

set smartindent
set noautoindent
set filetype=ruby
filetype indent off
filetype plugin indent on
set shiftwidth=2
set tabstop=2
set expandtab
"set ai "Auto indent
"set si "Smart indent
"set wrap "Wrap line
set backspace=indent,eol,start
set filetype=eruby
# /home/psychoslave/.config/nvim/after/ftplugin/eruby.vim
" Turn off vi compatibility
set nocompatible

set smartindent
set noautoindent
set filetype=ruby
filetype indent off
filetype plugin indent on
set shiftwidth=2
set tabstop=2
set expandtab
"set ai "Auto indent
"set si "Smart indent
"set wrap "Wrap line
set backspace=indent,eol,start
set filetype=eruby
# /home/psychoslave/.config/nvim/after/ftplugin/ruby.vim
" Turn off vi compatibility
set nocompatible

set smartindent
set noautoindent
set filetype=ruby
filetype indent off
filetype plugin indent on
set shiftwidth=2
set tabstop=2
set expandtab
"set ai "Auto indent
"set si "Smart indent
"set wrap "Wrap line
set backspace=indent,eol,start

But when I open a ruby file, it doesn't have tab set to 2 spaces and so on.

I did added filetype plugin indent on in ~/.config/nvim/init.vim.

Once running, trying to launch :so ~/.config/nvim/after/ftplugin/eruby.vim will lead to the following error, repeated multiple times:

line    6:                                                                                                                             
E218: autocommand nesting too deep                                                                                                     
Error detected while processing FileType Auto commands for "*":                                                                        
E218: autocommand nesting too deep 

How can I resolve this problem? Is there a way to list what configuration files a neovim red and in which order?

Answer 1

Just make sure your basic configuration has filetype enabled to begin with: filetype plugin on

If it is, but sill not working as intended, you can set filetypes explicitly:

Something like this should be in your ~/.vimrc or ~/.config/nvim/init.vim depending on whichever editor you are actually using:

augroup MyRubyCode
" Files with extension .rb are processed as Ruby code
    automcd!
    autocmd BufReadPre,FileReadPre *.rb set ft=ruby
augroup END

This will pick up whatever ruby file attributes set in your proper vim path ftplugin: e.g, /usr/share/vim/vim80/ftplugin (this is the actual path for both vim and neovim in a Fedora 27 distribution).

I believe you just want the MyRubyCode above so (probably) remove the custom files from your personal ftplugin folder.

e.g, ~/.config/nvim/after/ftplugin

e.g, ~/.config/nvim/ftplugin

The files you are putting there are doing silly things that don't help your cause. i.e., setting the file as a ruby file after it had been recognized as a ruby file. (filetype recognition happens before ftplugin so it doesn't make sense). That's why you should use your vim config file instead of fiddling with paths you don't fully understand yet.

Notice: if you don't want to fiddle with file extensions, just open the file and type :set ft=ruby in Vim's command line. If you want to make the change permanent, just use some Vim magic (modeline) at the very end of the file.

# vim: set ft=ruby

Enjoy.