Merlin plugin for Ocaml with VIM : autocompile the file when saving

Question

I recently installed Ocaml and its Merlin plugin for a university course. I am using Vim as a text editor. I have heard that it is possible to configure Merlin to compile automatically the .ml file when saving, but I can not find anything about that with a web research, and the professor is using emacs so he can not give me any information about how to activate this feature.

Answer 1

This is plain vanilla vim style, not relating to merlin. May be you can read merlin document for merlin specific configuration. Set the following in your ~/.vimrc

Use a key like F5 to achieve it

autocmd filetype ocaml nnoremap <F5> :!ocamlopt % -o %:r && ./%:r <CR>

This will compile and run executable when you hit F5.

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If you prefer makeprg option, keep the following autocommand in your vimrc

au filetype ocaml set makeprg=ocamlopt\ -o\ %<\ %
set aw

and then :make when you open your ml file. I would prefer this approach