Re: Aw: Re: Numeric codes of non-standard function keys

[Thomas Dickey]

On Mon, Apr 22, 2024 at 03:52:11PM +0200, Anton Vidovic wrote:
> Hello,
> 
> > > to 568 (kUP7)? Are those used as bitmasks for the modifiers
> > > Ctrl, Shift and Alt?
> 
> > ncurses doesn't do anything with modifiers.  Unlike PDCurses which
> > deals with systems that provide that information, curses is more
> > general.  Not everything is xterm or something that copies from xterm.
> >
> > The key definitions for modified keys are named according to a convention.
> > Those names are described in user_caps(5).
> 
> I have noticed that for xterm and xterm-like emulators, the extended 
> capabilities in terminfo descriptions include modifiers but only up to the 
> value "7", which corresponds to Alt+Control, as described here:
> 
> https://invisible-island.net/ncurses/man/user_caps.5.html
> https://invisible-island.net/xterm/terminfo.html
> https://www.invisible-island.net/xterm/xterm-function-keys.html
> 
> Is there a reason why the combination of all three modifiers,
> Shift+Alt+Control has not been included in the terminfo description, which
> leads to ncurses not automatically generating the corresponding key code,
> even though the terminal does send the correct sequence, for example ^[[1;8C
> for Ctrl-Alt-Shift-Right, which would be kRIT8?

Before I added a new terminfo format, the effective limit is 4096 bytes.

That determined the number of extended keys which could be defined,
and determined the size of the building-block which I used in a few places.

I could revisit this and construct a longer list for use in the entries
which are stored in the newer terminfo entry - though I'd have to
keep in mind whether the users of the terminfo database (such as NetBSD)
could handle the resulting larger entry.
 
> How would a ncurses application check for the availability of that key if the
> terminfo does not advertize it?
> 
> Kind regards,
> Anton
> 

-- 
Thomas E. Dickey <dickey@invisible-island.net>
https://invisible-island.net

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