Re: ANN: terminfo-20140607.src.gz

[Thomas Dickey]

On Tue, Jun 17, 2014 at 12:24:04PM +0100, Nicholas Marriott wrote:
> Hi
> 
> On Mon, Jun 16, 2014 at 06:18:37PM -0400, Thomas Dickey wrote:
> > On Mon, Jun 16, 2014 at 05:15:32PM +0100, Nicholas Marriott wrote:
> > > Hi
> > > 
> > > When tmux gets SGR 3 inside it will use sitm outside if the terminal has
> > > it, otherwise it'll use smso. I don't remember why, possibly to make
> > > rxvt users happier.
> > > 
> > > It's the same for SGR 7 - rev if it exists, otherwise smso.
> > > 
> > > But I'm not clear what problem you're seeing, if you want to show me the
> > > new terminfo entry and tell me how to reproduce the problem (preferably
> > > off-list), I'll have a look. Perhaps we should go back to doing the same
> > > as screen here since we are using its terminfo entry.
> > 
> > That's not necessarily a Good Thing.
> > 
> > You might consider making a special case on initialization to detect if it's
> > got TERM=screen{whatever} and/or smso containing SGR 3.
> 
> I'm not really sure what you mean here, it is relatively easy for tmux
> to automatically fix up the terminfo entry outside if needed but I think
> tmux-in-screen is rare enough for it not be much of a worry.

yes - but some users do set TERM=screen, just to make life interesting
 
> > 
> > screen equates SGR 3 to standout, has done this for more than twenty years,
> > and doesn't support italics (unless someone's going to modify screen).
> > 
> > On the other hand, ncurses can support italics - not a lot of feedback on 
> > that though.
> > 
> > An application that sends SGR 3 (hardcoded ECMA-48 italics for instance) 
> > will get standout.
> > Likewise, an application using screen's terminal description will send SGR 
> > 3 for standout.
> > So you can only do this reliably for applications using the terminal 
> > description.
> 
> Yes, there is no way for tmux to tell what an application using
> TERM=screen really wants when it sends SGR 3.
> 
> It seems better to me for tmux to use sitm when it gets SGR 3, if it's
> available. It's simple to configure tmux to ignore sitm if the user
> prefers.

agreed
 
> If we alway sent smso by default then it's both a) not really what SGR 3
> is meant to do and b) slightly harder to configure.
> 
> But I'm not sure what the problem is - I took a look at
> terminfo-20140614.src and it looks like both TERM=screen and
> TERM=screen.xterm-new still have smso=\E[3m and no sitm. So what's up?
> Christian?

screen would get confused otherwise - see my longish comment here:

        http://invisible-island.net/ncurses/terminfo.src.html#toc-_Screen

(look for "design error")

-- 
Thomas E. Dickey <address@hidden>
http://invisible-island.net
ftp://invisible-island.net

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