"title" frame param: Want "string %f %b" with string different for some frames

"title" frame param: Want "string %f %b" with string different for some frames

[Allan Gottlieb]

If I want the frame to have a unique title I use

(modify-frame-parameters nil '((title . "sam")))

Which works fine, making the title "sam".

Since I like the title to contain %b %f (buffer and file names), I
have in my .emacs

  (setq frame-title-format '("Emacs: %b <%f>")))

which also works fine.

I would like a combination of the two and am having trouble.

Say I want the current frame to have "sam" in the title together with
the current file and buffer names, I would like to say something like

 (setq current-frame-title-format '("sam: %b <%f>")))

and have all other frames still use  '("Emacs: %b <%f>")))

Any help would be appreciated.

thanks,
allan

Re: "title" frame param: Want "string %f %b" with string different for some frames

[Nikolaj Schumacher]

Allan Gottlieb <gottlieb@nyu.edu> wrote:

> Say I want the current frame to have "sam" in the title together with
> the current file and buffer names, I would like to say something like
>
>  (setq current-frame-title-format '("sam: %b <%f>")))
>
> and have all other frames still use  '("Emacs: %b <%f>")))

Well, you can do:

(set (make-variable-buffer-local 'frame-title-format) '("sam: %b <%f>"))

That's not exactly what you want, but maybe it'll get you a little
closer.

There's also `make-variable-frame-local', but I couldn't quite get it to
work.


regards,
Nikolaj Schumacher

Re: "title" frame param: Want "string %f %b" with string different for some frames

[Allan Gottlieb]

At Thu, 28 Aug 2008 19:23:03 +0200 Nikolaj Schumacher <me@nschum.de> wrote:

> Allan Gottlieb <gottlieb@nyu.edu> wrote:
>
>> Say I want the current frame to have "sam" in the title together with
>> the current file and buffer names, I would like to say something like
>>
>>  (setq current-frame-title-format '("sam: %b <%f>")))
>>
>> and have all other frames still use  '("Emacs: %b <%f>")))
>
> Well, you can do:
>
> (set (make-variable-buffer-local 'frame-title-format) '("sam: %b <%f>"))
>
> That's not exactly what you want, but maybe it'll get you a little
> closer.
>
> There's also `make-variable-frame-local', but I couldn't quite get it to
> work.

buffer-local isn't really good enough.  I do want to use the frame for
several files/buffers.

make-variable-frame-local is listed as obsolete in emacs 22.2 and
beyond, which are the ones I use (22.2 and 23.0.60).  The interesting
output of (describe-function 'make-variable-frame-local) is

    make-variable-frame-local is an interactive built-in function in `C source code'.
    (make-variable-frame-local VARIABLE)

    This function is obsolete since 22.2;
    use a frame-parameter instead.

    Enable VARIABLE to have frame-local bindings.
    This does not create any frame-local bindings for VARIABLE,
    it just makes them possible.

    A frame-local binding is actually a frame parameter value.
    If a frame F has a value for the frame parameter named VARIABLE,
    that also acts as a frame-local binding for VARIABLE in F--
    provided this function has been called to enable VARIABLE
    to have frame-local bindings at all.

    The only way to create a frame-local binding for VARIABLE in a frame
    is to set the VARIABLE frame parameter of that frame.  See
    `modify-frame-parameters' for how to set frame parameters.

    Buffer-local bindings take precedence over frame-local bindings.

I have been able to set the frame parameter "title", but that doesn't
give the ability to use %b %f.  My attempts at using
make-variable-frame-local and/or modify-frame-parameters have not
yet yielded the equivalent of my desired

 current-frame-title-format

as described above.

Thanks for your comments.
allan

Re: "title" frame param: Want "string %f %b" with string different for some frames

[Nikolaj Schumacher]

Allan Gottlieb <gottlieb@nyu.edu> wrote:

> At Thu, 28 Aug 2008 19:23:03 +0200 Nikolaj Schumacher <me@nschum.de> wrote:
>
>> (set (make-variable-buffer-local 'frame-title-format) '("sam: %b <%f>"))

I made a mistake there.  It should of course by `make-local-variable'.

> buffer-local isn't really good enough.  I do want to use the frame for
> several files/buffers.

Yes, I thought as much.  It might work if these buffers are dedicated or
never displayed in two frames at once, but still requires hackery.

> make-variable-frame-local is listed as obsolete in emacs 22.2 and
> beyond, which are the ones I use (22.2 and 23.0.60).

I found a lengthy discussion in emacs-devel, which started with a bug
and apparently concluded with the realization that nobody needs
frame-local variables.  Sorry.  I think there is no other way to achieve
what you want.

> I have been able to set the frame parameter "title", but that doesn't
> give the ability to use %b %f.  My attempts at using
> make-variable-frame-local and/or modify-frame-parameters have not
> yet yielded the equivalent of my desired

I had no success with `make-variable-frame-local', either, though it should
theoretically work.

`modify-frame-parameters' won't work, because there is no
frame-parameter for this.  I find the documentation a little fuzzy on this.


regards,
Nikolaj Schumacher

Re: "title" frame param: Want "string %f %b" with string different for some frames

[Allan Gottlieb]

At Thu, 28 Aug 2008 23:00:14 +0200 Nikolaj Schumacher <me@nschum.de> wrote:

> Allan Gottlieb <gottlieb@nyu.edu> wrote:
>
>> I have been able to set the frame parameter "title", but that doesn't
>> give the ability to use %b %f.  My attempts at using
>> make-variable-frame-local and/or modify-frame-parameters have not
>> yet yielded the equivalent of my desired
>
> I had no success with `make-variable-frame-local', either, though it should
> theoretically work.
>
> `modify-frame-parameters' won't work, because there is no
> frame-parameter for this.  I find the documentation a little fuzzy on this.

Indeed the entry for make-variable-frame-local is hard for me to
parse.  I sometimes think that this function turns a variable into a
frame parameter.

    This does not create any frame-local bindings for VARIABLE,
    it just makes them possible.

    A frame-local binding is actually a frame parameter value.
    If a frame F has a value for the frame parameter named VARIABLE,
    that also acts as a frame-local binding for VARIABLE in F--
    provided this function has been called to enable VARIABLE
    to have frame-local bindings at all.

    The only way to create a frame-local binding for VARIABLE in a frame
    is to set the VARIABLE frame parameter of that frame.  See
    `modify-frame-parameters' for how to set frame parameters.

But as you say, none of this seems to work.
allan