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RE: [found the culprit] (was: [emacs -q versus empty .emacs file])
From: |
Drew Adams |
Subject: |
RE: [found the culprit] (was: [emacs -q versus empty .emacs file]) |
Date: |
Wed, 14 Nov 2018 08:17:39 -0800 (PST) |
> It seems I misunderstood your original report: you wanted Z on a .tgz
> file to only uncompress it? That indeed has been changed in Emacs 26,
> for consistency with a .tar.gz file. I don't think it's a good idea
> to have the previous subtle difference back.
>
> I do think that Z on a compressed Tar archive, be it a .tar.gz or .tgz
> file, should not by default unpack the archive. We could have a
> special prefix arg to request that, and by default we should just
> uncompress the file. But that's a different issue.
`Z' should be its own inverse. And there definitely
needs to be a way to compress a tar file and get it
back again from the compressed file. Unpacking is
something else. If `Z' compresses then if used again it
should only uncompress, returning what you started with.
It's fine to have another key that unpacks a tar, or
even another key that both uncompresses and unpacks.
Is it hard to hit two keys to uncompress + unpack?
I'm a bit surprised to see that this change was made,
after decades of the pre-26 behavior. Was something
big gained by it?
BTW, I don't see this change called out in NEWS for
Emacs 26. Is it there and I just missed it?
Personally, I'd prefer that a choice to both uncompress
and unpack _not_ be made via a "special prefix arg" for
`Z'. If you can use a prefix arg with `Z' then you can
hit two keys to get the uncompress + unpack behavior.
My main reason for preferring that the prefix arg not
be co-opted for this is that in my Dired+ code I have
long co-opted it ( ;-) ) to use the following special
prefix args (and the same are used for _lots_ of Dired
commands):
Compress or uncompress marked (or next prefix argument) files.
A prefix argument ARG specifies files to use instead of marked.
An integer means use the next ARG files (previous -ARG, if < 0).
`C-u': Use the current file (whether or not any are marked).
`C-u C-u': Use all files in Dired, except directories.
`C-u C-u C-u': Use all files and directories, except `.' and `..'.
`C-u C-u C-u C-u': Use all files and all directories.
What's added are the multiple `C-u' prefixes.
Vanilla Dired could benefit from the same behavior, for
dired-do-* commands generally. To provide this behavior
I redefined macro `dired-map-over-marks' slightly:
If ARG is a cons with element 16, 64, or 256, corresponding to
'C-u C-u', 'C-u C-u C-u', or 'C-u C-u C-u C-u', then use all files
in the Dired buffer, where:
16 includes NO directories (including '.' and '..')
64 includes directories EXCEPT '.' and '..'
256 includes ALL directories (including '.' and '..')
If ARG is otherwise non-nil, use the current file.
- tgz extension and dired-do-compress, Uwe Brauer, 2018/11/13
- Re: tgz extension and dired-do-compress, Eli Zaretskii, 2018/11/13
- Re: tgz extension and dired-do-compress, Uwe Brauer, 2018/11/13
- [emacs -q versus empty .emacs file] (was: tgz extension and dired-do-compress), Uwe Brauer, 2018/11/14
- Re: [found the culprit] (was: [emacs -q versus empty .emacs file]), Eli Zaretskii, 2018/11/14
- Re: [found the culprit], Uwe Brauer, 2018/11/14
- Re: [found the culprit], Eli Zaretskii, 2018/11/14
- RE: [found the culprit] (was: [emacs -q versus empty .emacs file]),
Drew Adams <=
- Re: [found the culprit] (was: [emacs -q versus empty .emacs file]), Eli Zaretskii, 2018/11/14
- Re: [found the culprit], Stefan Monnier, 2018/11/14
- RE: [found the culprit], Drew Adams, 2018/11/14
- Re: [found the culprit], Stefan Monnier, 2018/11/14
- RE: [found the culprit], Drew Adams, 2018/11/14
- RE: [found the culprit] (was: [emacs -q versus empty .emacs file]), Drew Adams, 2018/11/14
- Re: [found the culprit], Davis Herring, 2018/11/14
- RE: [found the culprit], Drew Adams, 2018/11/14
- Re: [found the culprit], Mike Kupfer, 2018/11/14
- Re: [found the culprit], Richard Stallman, 2018/11/15