How to check non-c files in vim using syntastic and ycm without saving them?

Question

I am using vim with the plugins YouCompleteMe and syntastic for autocompletion and syntax checking .

If I am editing C or C++ files, syntax errors are marked after two seconds of in inactivity. When editing MATLAB files, syntax checks (using mlint) are done only after I save the file.

I know that the interval of two seconds is regulated via updatetime, which means checks of C files are performed after the swap file updates.

How can I get the same behaviour for source files of other programming languages (especially for MATLAB)?

Answer 1

The background checking of C-family languages is a product of YCM's syntastic intergration (see :h youcompleteme-syntastic-integration and :h g:ycm_register_as_syntastic_checker). I don't see an easy way to set YCM to do that with other file types or to set syntastic to auto-update.

You might be able to dig around in YCM's code to see how they do it, then either extend that to work with MATLAB files or write a small plugin.