> Hello to everyone.
>
> I want to write small function for my 'statusline' option, so it shows
> whether Caps Lock button was pressed or not. I work on laptop and
> "analog" led indicator is right under my wrist so I don't see it at all.
> Do you have any assumptions how this can be done?
>
> Thanks in advance!
>
> Best regards,
> Golubev Mikhail
Short answer: It can't.
Long answer: Vim cannot tell the current Caps Lock / Shift Lock / Scroll
Lock state, it doesn't know when a key was released but only that it was
pressed, and it doesn't know the Shift / Scroll / Alt state except
sometimes (and not always in a way that vimscript can read) when some
"ordinary" key gets pressed. And to make everything even more complex,
there are some keys or key combinations that Vim never sees because they
are snatched away before it can get them (e.g. on KDE Ctrl-F7 means
"switch to virtual desktop #7", on Linux Ctrl-Alt-F5 means "switch to
virtual text console #5 aka /dev/tty5); and in console mode it is also
dependent on the underlying terminal for what, if anything, if will see
for any particular key or key combination: for instance it is a well
known (and intentional) fact that Shift makes no difference in
conjunction with Ctrl-A to Ctrl-Z.
Best regards,
Tony.
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