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`auto-compression-mode' is dangerous (and not needed) in Emacs 21, and o
`auto-compression-mode' is dangerous (and not needed) in Emacs 21, and ought to be disabled.
07 Jan 2002 19:40:34 -0800
In GNU Emacs 21.1.1 (i386-debian-linux-gnu, X toolkit, Xaw3d scroll bars)
of 2001-12-06 on raven, modified by Debian
configured using `configure i386-debian-linux-gnu --prefix=/usr
--sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib
--infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes --with-x=yes
value of $LC_ALL: nil
value of $LC_COLLATE: nil
value of $LC_CTYPE:
value of $LC_MESSAGES: nil
value of $LC_MONETARY: nil
value of $LC_NUMERIC: nil
value of $LC_TIME: nil
value of $LANG: nil
I had `(auto-compression-mode 1)' in my .emacs, probably as a leftover
from Emacs20 or perhaps even Emacs19, and until Emacs21, it caused no
trouble. But with Emacs21, it interferes with saving compressed files.
To see what I mean, do the following steps:
* Create a small compressed text file like this:
echo hey you | gzip > /tmp/hey.gz
* Try to visit it with auto-compression-mode turned on:
emacs21 --eval='(auto-compression-mode 1)' -q /tmp/hey.gz
So far, so good: the file's contents appear on screen.
* Now edit the file by appending some text to it:
M-> What up?
* Try to save:
Note that Emacs asks you if you'd like to `Write hey.gz using
gzip'. Since that sounds reasonable, answer yes by typing `y'.
Now Emacs asks you to select a coding system. I have no idea what
this means, but accepting the default (utf-8) seems like the
reasonable thing to do, so hit RET. Note that Emacs asks the same
question again. This is puzzling. Hit RET again. Now Emacs seems
happy -- it prints `Wrote /tmp/hey.gz' in the echo area.
However, examine the file /tmp/hey.gz, and you'll see that it
doesn't contain what I'd expect it to: you can uncompress it with
`uncompress /tmp/hey.gz', but the resulting file isn't the words
`hey you What up?', but rather a bunch of apparently random
characters, which the `file' program describes as merely `data'.
This is scary.
Now it's possible that some combination of answers to Emacs' various
questions (`Write using gzip', `coding system') might make things work
out, but there are eight such combinations, and I didn't bother trying
them all. Instead, I simply removed `(auto-compression-mode 1)' from
my .emacs, and Emacs21 reads and writes compressed files just fine on
Since auto-compression-mode seems not to be required with Emacs21, and
in fact seems to at least cause confusing behavior, I suggest it be
disabled under Emacs 21.
PGP Fingerprint: 3E7B A3F3 96CA 8958 ACC5 C8BD 6337 0041 C01C 5276
- `auto-compression-mode' is dangerous (and not needed) in Emacs 21, and ought to be disabled.,
Eric Hanchrow <=