Group based gnus-summary-line-format ?

Group based gnus-summary-line-format ?

[jari.aalto]

    I'm trying to figure out where should I redefine the default
    gnus-summary-line-format for selected groups: nntp, mailing
    listp, private mail and my work mail have different needs
    for gnus-summary-line-format.

    If I change it inside gnus-summary-generate-hook, that won't
    work. What's next place to look for?

(defun my-gnus-summary-generate-hook  ()
   ....
    (when (string-match "nntp" group)
      (make-local-variable 'gnus-summary-line-format)
      (setq gnus-summary-line-format ...)
      )
 

    Further, I tried to figure out how to byte compile this custom
    spec beforehand, so that instead of saying 

        (setq gnus-summary-line-format ...)

    I would like to replace the definition with pre-byte-compiled one.
    The gnus-spec.el::gnus-compile is pretty hairy to read, how 
    does it actually work? (pictures would be nice)

    jari

Re: Group based gnus-summary-line-format ?

[Kai Grossjohann]

>>>>> On 15 Mar 1998,   said:

  Jari>     I would like to replace the definition with
  Jari>     pre-byte-compiled one.  The gnus-spec.el::gnus-compile is
  Jari>     pretty hairy to read, how does it actually work? (pictures
  Jari>     would be nice)

Isn't it sufficient to set the variable, then call gnus-compile?

kai
-- 
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Re: Group based gnus-summary-line-format ?

[jari.aalto]

| 98-03-15 Kai Grossjohann <grossjohann@charly.cs.uni-dortmund.de> list.ding
| >>>>> On 15 Mar 1998,   said:
| 
|   Jari>     I would like to replace the definition with
|   Jari>     pre-byte-compiled one.  The gnus-spec.el::gnus-compile is
|   Jari>     pretty hairy to read, how does it actually work? (pictures
|   Jari>     would be nice)
| 
| Isn't it sufficient to set the variable, then call gnus-compile?

I mean that if I have 5 different summary line formats for 5
different "type of" Groups: nntp, private mail, mailing list, server
logs ....

For all Gnus uses gnus-summaryline-format and that's
what it byte compiles too. But if I shift in the custom format to the
gnus-summary-line-format, I have to byte compile, and when
I shift in format2, I have to byte compile it again...

So I wanted to pre-byte-compile these 5 different formats, so that
I could do:

    (setq gnus-summary-line-format fmt1)
    (setq ...byte-compiled-definition fm1-byte-compiled)

Instead of

    (setq gnus-summary-line-format fmt1)
    (gnus-update-format-specifications 'force)    

which would mean constant byte compiling whenever I would 
change Groups.... 

jari

Re: Group based gnus-summary-line-format ?

[Hrvoje Niksic]

Stainless Steel Rat <ratinox@peorth.gweep.net> writes:

> | Isn't it sufficient to set the variable, then call gnus-compile?
> 
> ja> I mean that if I have 5 different summary line formats for 5
> ja> different "type of" Groups: nntp, private mail, mailing list, server
> ja> logs ....
> 
> I have nearly as many.  I have gnus-select-group-hook set an
> appropriate gnus-summary-line-format based on the newsgroup name,
> then at the end it calls gnus-compile.  It does not take that long.

Yet, this sounds wrong for general consumption.  One should be able to 
use Gnus without having the byte-compiler loaded at all.

-- 
Hrvoje Niksic <hniksic@srce.hr> | Student at FER Zagreb, Croatia
--------------------------------+--------------------------------
4.  Thou shalt not warlorde a sig if it bee the sig of Kibo, nor if
    it bee the sig of the Inner Circle.

Re: Group based gnus-summary-line-format ?

[Hrvoje Niksic]

Stainless Steel Rat <ratinox@peorth.gweep.net> writes:

> >>>>> "Hrvoje" == Hrvoje Niksic <hniksic@srce.hr> writes:
> 
> Hrvoje> Yet, this sounds wrong for general consumption.  One should be able
> Hrvoje> to use Gnus without having the byte-compiler loaded at all.
> 
> Oh, you can use Gnus and variable values for
> gnus-summary-line-format without having the byte-compiler loaded.
> Gnus will be dramatically slower for it, but it certainly can be
> done.

Unless I am missing something obvious, why is the byte-compiler needed 
at all?  It is not hard to imagine code that would keep an alist of
the byte-compiled formats and look up the appropriate element.  The
whole alist could be saved to `.newsrc.eld'.

-- 
Hrvoje Niksic <hniksic@srce.hr> | Student at FER Zagreb, Croatia
--------------------------------+--------------------------------
* Q: What is an experienced Emacs user?
* A: A person who wishes that the terminal had pedals.

Re: Group based gnus-summary-line-format ?

[Hrvoje Niksic]

Stainless Steel Rat <ratinox@peorth.gweep.net> writes:

> >>>>> "Hrvoje" == Hrvoje Niksic <hniksic@srce.hr> writes:
> 
> Hrvoje> Unless I am missing something obvious, why is the byte-compiler
> Hrvoje> needed at all?  It is not hard to imagine code that would keep an
> Hrvoje> alist of the byte-compiled formats and look up the appropriate
> Hrvoje> element.  The whole alist could be saved to `.newsrc.eld'.
> 
> Because it is hypothetically possible to have a different value for
> gnus-summary-line-format for every group.

In that hypothetical case you will end up having a large cache.  What
is your point?

> And unless I am missing something obvious, why is it "bad" to invoke
> the byte-compiler

I've never said it was bad to invoke the byte-compiler, but I did
imply that the code should be designed so that its invocation is not
mandatory.

-- 
Hrvoje Niksic <hniksic@srce.hr> | Student at FER Zagreb, Croatia
--------------------------------+--------------------------------
"Psychos _do not_ explode when sunlight hits them."

Re: Group based gnus-summary-line-format ?

[Hrvoje Niksic]

Stainless Steel Rat <ratinox@peorth.gweep.net> writes:

> >>>>> "Hrvoje" == Hrvoje Niksic <hniksic@srce.hr> writes:
> 
> Hrvoje> In that hypothetical case you will end up having a large cache.
> Hrvoje> What is your point?
> 
> That the cache is utterly and completely unnecessary.  It wastes
> both disk and memory when a simpler solution already exists.

Using that argument, you could also claim that saving bytecompiled
specs to `.newsrc.eld' at all is "utterly and completely unnecessary", 
too.

The whole point of caching the compiled specs is not having to invoke
the byte-compiler each time you have to deal with them.  Why this
cache would suddenly become unnecessary when you deal with more than
one specification is beyond me.

> Hrvoje> I've never said it was bad to invoke the byte-compiler, but
> Hrvoje> I did imply that the code should be designed so that its
> Hrvoje> invocation is not mandatory.
> 
> The invocation is *NOT* mandatory now.  Neither is changing the
> value of gnus-summary-line-format.

Uh, great.

-- 
Hrvoje Niksic <hniksic@srce.hr> | Student at FER Zagreb, Croatia
--------------------------------+--------------------------------
Which is worse: ignorance or apathy?  Who knows?  Who cares?

Re: Group based gnus-summary-line-format ?

[jari.aalto]

| 98-03-15 Stainless Steel Rat <ratinox@peorth.gweep.net> list.ding
| >>>>> "ja" == <jari.aalto@poboxes.com> writes:
| 
| | Isn't it sufficient to set the variable, then call gnus-compile?
| 
| ja> I mean that if I have 5 different summary line formats for 5
| ja> different "type of" Groups: nntp, private mail, mailing list, server
| ja> logs ....
| 
| I have nearly as many.  I have gnus-select-group-hook set an appropriate
| gnus-summary-line-format based on the newsgroup name, then at the end it
| calls gnus-compile.  It does not take that long.

Thanks  ratinox, I think I got it working. I compile the sspec like this
now:

      ;;  I'm only interested in compiling this spec
      (let* ((gnus-format-specs (list (assq 'summary gnus-format-specs))))
        (gnus-compile))


But I'm curious, what does gnus-update-format-specifications do?

jari

Re: Group based gnus-summary-line-format ?

[Raja R Harinath]

Stainless Steel Rat <ratinox@peorth.gweep.net> writes:
> >>>>> "ja" == <jari.aalto@poboxes.com> writes:
> | Isn't it sufficient to set the variable, then call gnus-compile?
> 
> ja> I mean that if I have 5 different summary line formats for 5
> ja> different "type of" Groups: nntp, private mail, mailing list, server
> ja> logs ....
> 
> I have nearly as many.  I have gnus-select-group-hook set an appropriate
> gnus-summary-line-format based on the newsgroup name, then at the end it
> calls gnus-compile.  It does not take that long.

Here's the recommended way to set `gnus-summary-line-format', taken from
gnus-gl.el.  Adapt it to your requirements:

      ;; Change how summary lines look
      (make-local-variable 'gnus-summary-line-format)
      (make-local-variable 'gnus-summary-line-format-spec)
      (setq gnus-summary-line-format gnus-summary-grouplens-line-format)
      (setq gnus-summary-line-format-spec nil)
      (gnus-update-format-specifications nil 'summary)
      (gnus-update-summary-mark-positions)

replacing `gnus-summary-grouplens-line-format' with your prefered
format. 

- Hari
-- 
Raja R Harinath ------------------------------ harinath@cs.umn.edu
"When all else fails, read the instructions."      -- Cahn's Axiom
"Our policy is, when in doubt, do the right thing."   -- Roy L Ash

Re: Group based gnus-summary-line-format ?

[Lars Magne Ingebrigtsen]

<jari.aalto@poboxes.com> writes:

>     If I change it inside gnus-summary-generate-hook, that won't
>     work. What's next place to look for?

The place to change things for mode X is in `x-mode-hook'.

-- 
(domestic pets only, the antidote for overdose, milk.)
  larsi@gnus.org * Lars Magne Ingebrigtsen