Question

I have in my .vimrc:

fun! MySys()
    if has('win16') || has('win32') || has('win64')
        return "win"
    endif
endfun

And in my .gvimrc:

if MySys() == "win"
    autocmd GUIEnter * simalt ~ x " start maximized"
endif

For some reason, the autocmd is being called when I open macvim in a mac workstation. It shouldn’t because I’m on a mac and the autocmd is inside a win if.

What problem can this be?

Answer 1

The reason for this is that you’re doing a strange comparison.

The MySys() function will return 1 if you’re on Windows and 0 if you’re not. You’re then comparing 0 to “win”, which (for reasons I don’t really understand) produces a match.

How about changing to this:

fun! MySys()
    if has('win16') || has('win32') || has('win64')
        return "win"
    elseif has('mac') || has('maxunix')
        return "mac"
    elseif has("unix") || has("win32unix")
        " Unix or Cygwin (which acts like Unix)
        return "unix"
    else
        return "other"
    endif
endfun

(Untested)