Re: [PATCH] Implement functions for measuring fonts and max chars per line

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sat, 17 Jan 2015 23:08:58 -0500
> From: "Perry E. Metzger" <perry@piermont.com>
> Cc: malsburg@posteo.de, emacs-devel@gnu.org
> 
> On Sun, 18 Jan 2015 05:42:49 +0200 Eli Zaretskii <eliz@gnu.org> wrote:
> > > > > This all brings to mind: is there a good way now to determine
> > > > > what the maximum number of lines in a frame would be in a
> > > > > given font on the user's display?
> > > > 
> > > > You mean window, not frame, right?
> > > 
> > > No, frame.
> > 
> > It's meaningless to ask this question about frames, since frames
> > don't display text, at least not in GUI sessions.
> 
> There is a variables named default-frame-alist where I can do
> things like setting 'height to an integer like "55" which
> seems to indicate a frame where 55 lines of text may be viewed.

That's just a (not so accurate) way of measuring frame's dimensions in
canonical character units, that's all.

> Perhaps my terminology is screwed up because of "default-frame-alist"
> and the like, but my goal is to calculate what "55" should be rather
> than setting it through trial and error. Regardless, my .emacs
> currently includes
> 
> (if window-system
>     (add-to-list 'default-frame-alist
> 		 (cons 'height 60)))
> 
> and I'd like to compute which "height" is full height for my display
> (again, rather than simply figuring a number out by trial and error).

So your actual goal is to maximize the frame's height.

> > > I'd like to be able to set my default frame height to "full
> > > height" for the display (filling the display from top to bottom)
> > > -- right now I do guesswork to do this, and my .emacs breaks when
> > > I switch to a new display.
> >
> > Then you need to maximize the frame vertically.
> 
> I'm unclear on how to do that programatically either.

Didn't you see what Michael wrote:

> From: Michael Heerdegen <michael_heerdegen@web.de>
> Date: Sun, 18 Jan 2015 02:01:46 +0100
> 
> "Perry E. Metzger" <perry@piermont.com> writes:
> 
> > > ‘-fh’
> > > ‘--fullheight’
> > >      Specify that the height should be the height of the screen.
> 
> > Yes. What I want to do is do it programatically in elisp, not on the
> 
> How about (set-frame-parameter nil 'fullscreen 'fullheight)?

Isn't that exactly what you want?