Override filetypes that already exist in filetype.vim

[edwintorok]

Some OCaml filetypes already exist in NeoVim's filetype.vim/filetype.lua.
setf only sets the filetype if it is not already set.
Because filetype.vim already set the filetype for .mli/.mll/*.mly and
is loaded before this ftdetect plugin we have to override it using set ft.

This is 'solution A' from https://neovim.io/doc/user/filetype.html#new-filetype

The other filetypes are either new, or match what is already declared in
filetype.vim so no need for overrides there.

See also my comment at ocaml#61 (comment)

[edwintorok]

I've only tested this on NeoVim. Based on my reading of http://vimdoc.sourceforge.net/htmldoc/filetype.html#new-filetype it should work on Vim too (scenario A is common between Vim and NeoVim).

[undu]

vim-ocaml regularly pushed to the vim and neovim repositories and serves as the default upstream. This means that the intention in these ftdectedt files is to be overriden by configurations, and this is why setf is being used, this follows the rest of filetypes in https://github.com/ocaml/vim-ocaml/tree/master/ftdetect

If something is overriding these they should be changed, let's see how open to this are the neovim people :)

[edwintorok]

There is a different way to solve this now that NeoVim has switched to using filetype.lua only.
See ocaml#61 (comment)