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From: Ergus <spacibba@aol.com>
To: emacs-devel@gnu.org
Subject: Issue with hide-ifdef and cc-mode
Date: Sun, 30 May 2021 09:08:22 +0200	[thread overview]
Message-ID: <20210530070822.h57mmtpp2n7dvpbf@Ergus> (raw)
In-Reply-To: 20210530070822.h57mmtpp2n7dvpbf.ref@Ergus

Hi:

I sent this message to the emacs-help mailing list some days ago and I
didn't receive any reply. So I'm resubmitting this here:

I am trying to use hide-ifdef to shadow code like:

#if 0
<code>
#endif

But I found that either

#if 0

or 

#if 1

produces the same result disabling the code inside.

Some slightly more complex examples like:

#define var 1
#ifdef var

doesn't work either (of course).

And when I try hif-evaluate-macro it says things like: 

false <= ‘#if 1’

or 

1 is not defined... Unless the documentation says this function is
capable to understand some more complex constructions like ||, && and
arithmetic 

I only want to disable some code with #if 0 and enable it with #if
1... so my use case is probably the simplest one.

Do we have anything smarter in emacs to shows #if 0 codes? Or is there
any extra customization I am missing or is there any issue in the
package itself? any idea?

Also when I remove the #if macros from around the code the shadow face
sometimes persist.

I would expect such a functionality to be implemented with fontlock or
so, but form an old thread in this mailing list I see that such a thing
is not recommended. But this package is not very documented in the
manual either so I am not sure If I am missing something.

Right now I have only these options:

```
(setq-default hide-ifdef-shadow t
	      hide-ifdef-initially t)
```

Any help than? Should I submit a bug?

Thanks in advance,
Ergus




       reply	other threads:[~2021-05-30  7:08 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20210530070822.h57mmtpp2n7dvpbf.ref@Ergus>
2021-05-30  7:08 ` Ergus [this message]
2021-05-30 11:01   ` Issue with hide-ifdef and cc-mode Daniel Martín
2021-05-30 18:14     ` Ergus
2021-05-30 18:53       ` Eli Zaretskii
2021-05-30 19:27         ` Ergus
2021-05-31 11:56           ` Eli Zaretskii
2021-05-30 19:42       ` Stefan Monnier
2021-05-30 20:26         ` Ergus
     [not found] <20210527030630.ys6pbkbtqui66iuz.ref@Ergus>
2021-05-27  3:06 ` Ergus

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