How do I map keys for specific file types in Vim?

Question

I want my Enter key to follow links in help files because my keyboard doesn't have a ] key. Therefore I've put:

nnoremap <Enter> <C-]>

In ftplugin/help.vim. This works, but this key map is now "global" and messes up the use of the key in other places, for example the q: command window.

So how do I restrict a key-bind to a single buffer, or perhaps even a single file type?

Answer 1

map the command using autocmd:

autocmd FileType c,cpp,php nnoremap <buffer> <Enter> <C-]>

maps only for filetypes: c,cpp and php