@CervEd It works for me. For example, I put the cursor on "./", do mf, then mx, type ls then Enter and it shows the listing for that directory.

@weakish Just to avoid confusing newer users it should be noted that you're referring to Lua configuration. The answer works as is for Neovim when using traditional vimrc.

@RobM LOL. Yay, after 1 year I don't have zero upvotes on this answer... ;) (And I just noticed I had a typo, too! The doc excerpt had one autocommand but the example used another.)

@D.BenKnoble I never noticed this comment before. That was nice of you. I'm actually still working on musecnav...I totally rewrote it, in fact, cuz it was a spaghetti mess. Just need to find the time to upload to GH. Sigh...it always comes down to finding the time....

You don't need a function. In just about any programming language you can assign the result of an expression directly to a variable, e.g. foo = bar or baz. A boolean expression like this will assign either 'true' or 'false' (or '1' or '0' in some langauges). Since you want to assign 'false' if your expression evaluates to 'true', you can 'not' the whole thing: foo = not (bar or baz) (Alternatively, you could invert the boolean logic by inverting the three operators: both > to <= and or to and.)

Quick and dirty solution... follow :1,$!yapf with if v:shell_error | undo | endif :)