How to have all threads folded when first displaying header buffer?

[Richard H Stanton]

I'd like to fold all my threads automatically when i enter the header buffer. I've tried 

(add-hook 'mu4e-headers-mode-hook
          (lambda ()
            (mu4e-thread-fold-all)))

but it doesn't do what i want, even though manually running mu4e-thread-fold-all works fine.

What am I missing?

Thanks!

[Joost Kremers]

A mode hook is run when a mode is activated (and when it is deactivated, BTW),
which in the case of `mu4e-headers-mode` is (most likely) happens before the
buffer is actually filled. So you're calling `mu4e-thread-fold-all` before there
are any headers in the buffer. (I say "most likely", because I'm not actually familiar
with the relevant code, but it would make the most sense.)

I don't know if there's a way to do what you want. Ideally, there would be a
user option to control this, but I don't think there is.

Note, BTW that if you have a `lambda` with only one function, you can just use
the function itself:

(add-hook 'mu4e-headers-mode-hook #'mu4e-thread-fold-all)




--
Joost Kremers
Life has its moments

[Tassilo Horn]

Joost Kremers <joostk...@fastmail.fm> writes:

> I don't know if there's a way to do what you want. Ideally, there
> would be a user option to control this, but I don't think there is.

I think

(setq-default mu4e-thread--fold-status t)

should do the trick (don't ask me why that is a "private" variable).

Bye,
Tassilo

[Richard H Stanton]

Thanks for the suggestion, but this doesn't seem to do what I'm looking for, I'm afraid.

[Joost Kremers]

Well, a quick look at the code suggests that `mu4e-thread--fold-status` is used
to keep track of the current fold status: its value is changed when you fold or
unfold all threads. That wouldn't be appropriate for a user option.

Just noticed: (info "(mu4e) Folding threads") says this:

```
If you want to automatically fold all threads after a query, you can
use a hook:
(add-hook 'mu4e-thread-mode-hook #'mu4e-thread-fold-apply-all)
```

@Richard, Perhaps that does what you're looking for?

[Tassilo Horn]

"'Richard H Stanton' via mu-discuss" <mu-di...@googlegroups.com> writes:

Hi Richard,

> Thanks for the suggestion, but this doesn't seem to do what I'm
> looking for, I'm afraid.
>>

>> I think
>>
>> (setq-default mu4e-thread--fold-status t)
>>
>> should do the trick (don't ask me why that is a "private" variable).

Hm, I can assure you I've had

(setopt mu4e-thread--fold-status t)

in my config (which assumes Emacs 29.1 or never) which made threads
folded by default (with mu 1.12.x). I didn't like that behavior so
removed that line again but again, it worked for me two weeks ago.

There are also other variables wrt. folding, e.g., I had set

(setopt mu4e-thread-fold-single-children t)

so that threads with just one child were folded, too, which is a bit
senseless given that you only replace the real child with a folding line
so no space is saved.

Bye,
Tassilo

[Richard H Stanton]

Aha! It works if I use mu4e-thread-fold-all.

Thanks!

[Richard H Stanton]

That was supposed to be in reply to Joost's message above. In other words, this works for me:

(add-hook 'mu4e-thread-mode-hook #'mu4e-thread-fold-all)

[Richard H Stanton]

Odd. It definitely didn't work for me! Maybe it interacts with some of my other settings, but since this problem is now solved, I'm not sure we'll ever know...

Best,

Richard

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