bug#24994: 26.0.50; Emacs doesn't allow viewing .cbr files

bug#24994: 26.0.50; Emacs doesn't allow viewing .cbr files

[Lars Ingebrigtsen]

These are really .rar files, so they should be treated the same as those.

I thought this stuff went into auto-mode-alist, but Emacs seems to
recognize .cbz files (they're really zip files), and that isn't
mentioned there, so ... is there a different mechanism here to hook
these files up with archive-mode?


In GNU Emacs 26.0.50.14 (x86_64-unknown-linux-gnu, GTK+ Version 3.14.5)
 of 2016-11-18 built on stories
Repository revision: e8efa66e01933b8ae7ac9abf530a3818551c1343
Windowing system distributor 'The X.Org Foundation', version 11.0.11604000
System Description:	Debian GNU/Linux 8.6 (jessie)

Recent messages:
.emacs: ‘with-decoded-time-value’ is an obsolete macro (as of 25.1). [2 times]
For information about GNU Emacs and the GNU system, type C-h C-a.
File Legion of Super-Heroes, 2010-05-19 (#01) (two covers) (digital) (Glorith-Novus).cbz is large (25.0M), really open? (y or n) y
Parsing archive file...done.
File Legion of Super-Heroes 000 (2012) (digital) (Minutemen-PhD).cbr is large (33.7M), really open? (y or n) y

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  global-whitespace-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t

Load-path shadows:
/home/larsi/src/cddb.el/expect hides /home/larsi/lisp/expect
/home/larsi/src/cddb.el/captitle hides /home/larsi/lisp/captitle
/home/larsi/src/clock.el/clock hides /home/larsi/lisp/clock
~/pgnus/contrib/vcard hides /home/larsi/lisp/vcard
/home/larsi/src/pvr.el/pvr hides /home/larsi/lisp/pvr
~/lisp/zenirc-2.112/src/zenirc-example hides /home/larsi/lisp/zenirc-example
~/pgnus/contrib/compface hides /home/larsi/src/emacs/trunk/lisp/image/compface

Features:
(shadow sort emacsbug sendmail arc-mode archive-mode gnus-delay
gnus-draft gnus-agent gnus-srvr gnus-score score-mode nnvirtual nntp
gnus-cache gnus-msg gnus-art mm-uu mml2015 mm-view mml-smime smime dig
gnus-sum nndraft nnmh gnus-group gnus-undo gnus-start gnus-cloud nnimap
utf7 netrc nnoo parse-time gnus-spec gnus-win nnmail gnus-int gnus-range
mail-source message format-spec rfc822 mml mml-sec epa epg mailabbrev
gmm-utils mailheader gnus nnheader gnus-util rmail rmail-loaddefs
mail-utils whitespace movie mkv shr svg imdb dom pvr debug debbugs-gnu
easy-mmode derived debbugs soap-client mm-decode mm-bodies mm-encode
url-http tls gnutls url-auth mail-parse rfc2231 rfc2047 rfc2045 mm-util
ietf-drums mail-prsvr url-gw nsm puny url url-proxy url-privacy
url-expand url-methods url-history url-cookie url-domsuf url-util
mailcap warnings rng-xsd rng-dt rng-util xsd-regexp xml ido flyspell
ispell benchmark w3m browse-url doc-view subr-x dired dired-loaddefs
image-mode timezone w3m-hist w3m-fb w3m-ems wid-edit w3m-ccl ccl
w3m-favicon w3m-image w3m-proc w3m-util add-log mail-extr jka-compr cl
finder-inf package epg-config url-handlers url-parse auth-source cl-seq
eieio eieio-core cl-macs eieio-loaddefs password-cache url-vars seq
byte-opt gv bytecomp byte-compile cl-extra help-mode easymenu cconv
cl-loaddefs pcase cl-lib time-date mule-util tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list newcomment elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese charscript case-table epa-hook
jka-cmpr-hook help simple abbrev obarray minibuffer cl-preloaded nadvice
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote dbusbind inotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 253839 9640)
 (symbols 48 34575 0)
 (miscs 40 57 262)
 (strings 32 63538 10521)
 (string-bytes 1 1971561)
 (vectors 16 29528)
 (vector-slots 8 629167 3332)
 (floats 8 528 326)
 (intervals 56 692 172)
 (buffers 976 16)
 (heap 1024 46464 1841))

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#24994: 26.0.50; Emacs doesn't allow viewing .cbr files

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Tue, 22 Nov 2016 23:51:20 +0100
> 
> 
> These are really .rar files, so they should be treated the same as those.
> 
> I thought this stuff went into auto-mode-alist, but Emacs seems to
> recognize .cbz files (they're really zip files), and that isn't
> mentioned there, so ... is there a different mechanism here to hook
> these files up with archive-mode?

magic-mode-alist?

bug#24994: 26.0.50; Emacs doesn't allow viewing .cbr files

[Andy Moreton]

On Wed 23 Nov 2016, Eli Zaretskii wrote:

>> From: Lars Ingebrigtsen <larsi@gnus.org>
>> Date: Tue, 22 Nov 2016 23:51:20 +0100
>> 
>> 
>> These are really .rar files, so they should be treated the same as those.
>> 
>> I thought this stuff went into auto-mode-alist, but Emacs seems to
>> recognize .cbz files (they're really zip files), and that isn't
>> mentioned there, so ... is there a different mechanism here to hook
>> these files up with archive-mode?
>
> magic-mode-alist?

More likely to be magic-fallback-mode-alist.

bug#24994: 26.0.50; Emacs doesn't allow viewing .cbr files

[Glenn Morris]

I made the necessary change to auto-mode-alist in fa525b7.
I don't know if it's worth doing anything with the "Rar!" magic string.

bug#24994: 26.0.50; Emacs doesn't allow viewing .cbr files

[Lars Ingebrigtsen]

Glenn Morris <rgm@gnu.org> writes:

> I made the necessary change to auto-mode-alist in fa525b7.

Thanks!  But I thought since .cbz wasn't in auto-mode-alist, and Emacs
still recognised it, then .cbr files should perhaps be...  er...
recognised by the same mechanism that recognised the .cbz files...  or
something...

Yes, I have no idea how auto-mode-alist and the magic modes work.  :-)

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#24994: 26.0.50; Emacs doesn't allow viewing .cbr files

[Glenn Morris]

If you want auto-detection of rar files with arbitrary extensions to
work, add a "Rar!" + archive-mode entry to magic-fallback-mode-alist.
I don't know if it's worth it, because compared to zip files, they are
much less common, plus "Rar!" does not seem as unique an indicator to me
as eg zip's "PK\003\004".

bug#24994: 26.0.50; Emacs doesn't allow viewing .cbr files

[Lars Ingebrigtsen]

Glenn Morris <rgm@gnu.org> writes:

> If you want auto-detection of rar files with arbitrary extensions to
> work, add a "Rar!" + archive-mode entry to magic-fallback-mode-alist.
> I don't know if it's worth it, because compared to zip files, they are
> much less common, plus "Rar!" does not seem as unique an indicator to me
> as eg zip's "PK\003\004".

Ah, I see.  Makes sense.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no