GNU bug report logs - #8084
24.0.50; grep still relies on font-lock somewhat

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Lars Magne Ingebrigtsen <lmi <at> gnus.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.0.50; Grep output not usable in Ubuntu
Date: Sat, 19 Feb 2011 17:44:54 -0800

In a default install of Ubuntu Maverick, M-x grep doesn't seem to work
very well.  The problem seems to be related to Ubuntu grep having
colourising switched on by default.

Adding --color=never to the options fixes the problem, but we probably
don't want to do that?  Adding GREP_COLORS=never to the environment
is supposed to help, but doesn't seem to do anything to me.

This is the output I get from

M-x grep -nH -e hello *.el

-*- mode: grep; default-directory: "~/pgnus/lisp/" -*-
Grep started at Sat Feb 19 17:40:48

grep -nH -e hello *.el
auth-source.el:262:;; (let ((auth-source-debug 'debug)) (auth-source-do-debug "[01;31mhello[m"))
auth-source.el:263:;; (let ((auth-source-debug t)) (auth-source-do-debug "[01;31mhello[m"))
auth-source.el:264:;; (let ((auth-source-debug nil)) (auth-source-do-debug "[01;31mhello[m"))
gnus.el:4080:  ;; "[01;31mhello[m", and the select method is ("[01;31mhello[m" (my-var "something"))
gnus.el:4082:  ;; called "[01;31mhello[m+alt.alt".



In GNU Emacs 24.0.50.6 (x86_64-unknown-linux-gnu, GTK+ Version 2.22.0)
 of 2011-02-14 on lenovo
Windowing system distributor `The X.Org Foundation', version 11.0.10900000
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Summary

Minor modes in effect:
  diff-auto-refine-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t

Recent input:
C-x C-s C-x 4 a D o c u m e n t SPC a <backspace> l 
a y o u t SPC n a m e s . C-x C-s H-d H-c C-c C-c <help-echo> 
b <help-echo> <switch-frame> g <up> <up> <up> <up> 
<up> <up> <up> <return> d d q <return> <return> n n 
q SPC SPC <backspace> A T q M-x g r e p <return> h 
e l l o SPC * . e l <return> <switch-frame> <help-echo> 
M-x M-p <return> C-a C-y = n e v e r SPC C-e SPC * 
<backspace> <backspace> * . h e l l o <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
h e l l o p SPC <backspace> <backspace> SPC * e . <backspace> 
<backspace> . e l <return> C-x C-f <M-backspace> l 
i s <tab> <return> M-x M-p <return> M-p <return> <help-echo> 
M-: M-p C-g M-x M-p <return> M-p C-a <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> S <return> M-x M-p <return> M-p M-p <return> 
x M-p <return> M-x M-p <return> M-p M-p <return> M-x 
M-p <return> M-p <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <right> <M-backspace> a l w a 
y s <return> M-: M-p C-g M-x M-p <return> M-p <help-echo> 
<down-mouse-1> <mouse-movement> <mouse-movement> <drag-mouse-1> 
M-x M-p C-a <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <M-backspace> 
<M-backspace> <M-backspace> <return> H-o H-o M-x M-p 
<return> M-p <return> C-x o <down> <down> <down> <down> 
<up> C-SPC <up> <up> <up> C-SPC <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> M-w H-o g SPC <backspace> M-x r e p o 
<tab> r <tab> <return>

Recent messages:
Grep finished (matches found)
Quit
Grep finished (matches found) [2 times]
(No deletions requested)
Grep finished (matches found) [2 times]
Quit
read-extended-command: Command attempted to use minibuffer while in minibuffer
Grep finished (matches found) [2 times]
Mark set [2 times]
Making completion list...

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/home/larsi/pgnus/lisp/mail-source hides /home/larsi/src/emacs/trunk/lisp/gnus/mail-source
/home/larsi/pgnus/lisp/nndiary hides /home/larsi/src/emacs/trunk/lisp/gnus/nndiary
/home/larsi/pgnus/lisp/gnus-delay hides /home/larsi/src/emacs/trunk/lisp/gnus/gnus-delay
/home/larsi/pgnus/lisp/gnus-score hides /home/larsi/src/emacs/trunk/lisp/gnus/gnus-score
/home/larsi/pgnus/lisp/nnspool hides /home/larsi/src/emacs/trunk/lisp/gnus/nnspool
/home/larsi/pgnus/lisp/gnus-agent hides /home/larsi/src/emacs/trunk/lisp/gnus/gnus-agent
/home/larsi/pgnus/lisp/gnus-logic hides /home/larsi/src/emacs/trunk/lisp/gnus/gnus-logic
/home/larsi/pgnus/lisp/mail-parse hides /home/larsi/src/emacs/trunk/lisp/gnus/mail-parse
/home/larsi/pgnus/lisp/nnrss hides /home/larsi/src/emacs/trunk/lisp/gnus/nnrss
/home/larsi/pgnus/lisp/rfc2045 hides /home/larsi/src/emacs/trunk/lisp/gnus/rfc2045
/home/larsi/pgnus/lisp/time-date hides /home/larsi/src/emacs/trunk/lisp/calendar/time-date
/home/larsi/pgnus/lisp/parse-time hides /home/larsi/src/emacs/trunk/lisp/calendar/parse-time
/home/larsi/pgnus/lisp/pgg-gpg hides /home/larsi/src/emacs/trunk/lisp/obsolete/pgg-gpg
/home/larsi/pgnus/lisp/pgg-pgp5 hides /home/larsi/src/emacs/trunk/lisp/obsolete/pgg-pgp5
/home/larsi/pgnus/lisp/pgg-def hides /home/larsi/src/emacs/trunk/lisp/obsolete/pgg-def
/home/larsi/pgnus/lisp/pgg-pgp hides /home/larsi/src/emacs/trunk/lisp/obsolete/pgg-pgp
/home/larsi/pgnus/lisp/pgg hides /home/larsi/src/emacs/trunk/lisp/obsolete/pgg
/home/larsi/pgnus/lisp/pgg-parse hides /home/larsi/src/emacs/trunk/lisp/obsolete/pgg-parse

Features:
(shadow emacsbug grep compile comint nroff-mode arc-mode archive-mode
tramp-cache tramp tramp-compat advice advice-preload tramp-loaddefs
url-handlers thingatpt epa-file epa derived epg texinfo info log-view
timezone pp flow-fill vc-annotate gnus-bcklg shr-color color nndir nnml
nnspool url-http url-auth url-gw shr gnus-html browse-url xml url-cache
mm-url url url-proxy url-privacy url-expand url-methods url-history
url-cookie url-util url-parse url-vars mule-util utf-7 diff-mode debug
log-edit easy-mmode pcvs-util vc-bzr vc-sccs vc-svn vc-cvs vc-rcs vc-dir
ewoc vc vc-dispatcher etags ring help-fns apropos cl-specs edebug
canlock sha1 hex-util dired-aux help-mode view vc-git sort smiley
ansi-color gnus-async gnus-draft newcomment gnus-cite ecomplete qp
gnus-ml disp-table gnus-fun gnus-mdrtn multi-isearch gnus-topic nndoc
nnmbox nndraft nnfolder nnimap parse-time utf7 nnmh auth-source eieio
byte-opt bytecomp byte-compile assoc netrc gnutls spam-report spam
spam-stat gnus-uu yenc gnus-agent gnus-srvr gnus-score score-mode
nnvirtual gnus-msg gnus-art mm-uu mml2015 epg-config mm-view mml-smime
smime password-cache dig mailcap nntp proto-stream starttls tls
gnus-cache nnir gnus-sum macroexp nnoo gnus-group gnus-undo nnmail
mail-source format-spec gnus-start gnus-spec gnus-int gnus-range message
sendmail rfc822 mml easymenu mml-sec mm-decode mm-bodies mm-encode
mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mailabbrev gmm-utils
mailheader gnus-win gnus-load gnus gnus-ems nnheader gnus-util time-date
mail-utils mm-util mail-prsvr wid-edit ido flyspell ispell dired
regexp-opt add-log mail-extr jka-compr cl tooltip ediff-hook vc-hooks
lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image fringe
lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
loaddefs button minibuffer faces cus-face files text-properties overlay
md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process dynamic-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

-- 
(domestic pets only, the antidote for overdose, milk.)
  larsi <at> gnus.org * Lars Magne Ingebrigtsen

Message #8 received at 8084 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Lars Magne Ingebrigtsen <lmi <at> gnus.org>
Cc: 8084 <at> debbugs.gnu.org
Subject: Re: bug#8084: 24.0.50; Grep output not usable in Ubuntu
Date: Mon, 21 Feb 2011 04:00:56 -0500

Lars Magne Ingebrigtsen wrote:

> In a default install of Ubuntu Maverick, M-x grep doesn't seem to work
> very well.  The problem seems to be related to Ubuntu grep having
> colourising switched on by default.

How did they switch on colours by default? I would have guessed it's
just a shell alias, which shouldn't affect Emacs.

In any case, it's kind of odd that this would cause a problem, since
Emacs itself turns on grep colours by default - see
grep-highlight-matches and grep-process-setup.

Message #11 received at 8084 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 8084 <at> debbugs.gnu.org
Subject: Re: bug#8084: 24.0.50; Grep output not usable in Ubuntu
Date: Mon, 21 Feb 2011 01:19:25 -0800

Glenn Morris <rgm <at> gnu.org> writes:

>> In a default install of Ubuntu Maverick, M-x grep doesn't seem to work
>> very well.  The problem seems to be related to Ubuntu grep having
>> colourising switched on by default.
>
> How did they switch on colours by default? I would have guessed it's
> just a shell alias, which shouldn't affect Emacs.

D'oh!  It is:

larsi <at> lenovo:~$ type grep
grep is aliased to `grep --color=auto'

That explains why doing stuff like

GREP_COLORS=never grep ...

doesn't work for me...  How silly.

But does Emacs bypass the shell alias settings?

> In any case, it's kind of odd that this would cause a problem, since
> Emacs itself turns on grep colours by default - see
> grep-highlight-matches and grep-process-setup.

The former is 'auto for me.  But still I'm getting...

gnus.el:4080:  ;; "[01;31mhello[m", and the select method is ("[01;31mhello[m" (my-var "something"))

Oh, d'oh again!

I have

(global-font-lock-mode -1)

and that makes the escape codes not work.

So this is all user error, I think.  Or should M-x grep work if you have
font locking switched off?  It's not only that the output of M-x grep is
unreadable, but `next-error' doesn't work the first time, either.  (The
second and subsequent times it does work.)

-- 
(domestic pets only, the antidote for overdose, milk.)
  larsi <at> gnus.org * Lars Magne Ingebrigtsen

Message #14 received at 8084 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 8084 <at> debbugs.gnu.org
Subject: Re: bug#8084: 24.0.50; Grep output not usable in Ubuntu
Date: Mon, 21 Feb 2011 16:44:02 -0500

Lars Ingebrigtsen wrote:

> But does Emacs bypass the shell alias settings?

It just calls the executable, without going through the shell.

> (global-font-lock-mode -1)

Probably grep-process-setup should also test font-lock status before
enabling color.

I did notice that the help-echo and mouse-face properties will also be
lost without font-lock though.

Message #17 received at 8084 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Glenn Morris <rgm <at> gnu.org>, 8084 <at> debbugs.gnu.org
Subject: Re: bug#8084: 24.0.50; Grep output not usable in Ubuntu
Date: Mon, 21 Feb 2011 16:44:19 -0500

> So this is all user error, I think.

No.

> Or should M-x grep work if you have font locking switched off?

Yes.

> It's not only that the output of M-x grep is unreadable, but
> `next-error' doesn't work the first time, either.

grep.el's treatment of color-escape-sequences should be moved to
a process-filter.  I do not have time to work on this, right now, so
if someone else could take care of it, that would be great.

> (The second and subsequent times it does work.)

No idea why that would happen.


        Stefan

Message #22 received at 8084 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: Lars Ingebrigtsen <larsi <at> gnus.org>, 8084 <at> debbugs.gnu.org
Subject: Re: bug#8084: 24.0.50; Grep output not usable in Ubuntu
Date: Mon, 21 Feb 2011 23:46:20 +0100

Glenn Morris <rgm <at> gnu.org> writes:

> Lars Ingebrigtsen wrote:
>
>> But does Emacs bypass the shell alias settings?
>
> It just calls the executable, without going through the shell.

That's not true, you wouldn't get the filename expansion without the
shell.  The real reason is that non-interactive shells don't expand
aliases.

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Message #25 received at 8084 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> jurta.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: Lars Ingebrigtsen <larsi <at> gnus.org>, 8084 <at> debbugs.gnu.org
Subject: Re: bug#8084: 24.0.50; grep still relies on font-lock somewhat
Date: Wed, 10 Aug 2011 22:03:19 +0300

>> (global-font-lock-mode -1)
>
> Probably grep-process-setup should also test font-lock status before
> enabling color.

Do I understand correctly that after revno:104159 (2011-05-08) that
fixes bug#7952 by handling escape sequences in the process filter
rather than in font-lock, now the line `(null font-lock-mode)' should be
removed from `grep-process-setup' and this bug#8084 should be closed?

Message #30 received at 8084-done <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> jurta.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: Lars Ingebrigtsen <larsi <at> gnus.org>, 8084-done <at> debbugs.gnu.org
Subject: Re: bug#8084: 24.0.50; grep still relies on font-lock somewhat
Date: Mon, 05 Sep 2011 12:49:43 +0300

> Do I understand correctly that after revno:104159 (2011-05-08) that
> fixes bug#7952 by handling escape sequences in the process filter
> rather than in font-lock, now the line `(null font-lock-mode)' should be
> removed from `grep-process-setup'

I now think that `grep-process-setup' should still check for
`(null font-lock-mode)' to not output color escapes
that can't be highlighted with `font-lock-face' by `grep-filter'.
There is no harm to output color escapes because `grep-filter'
still removes them, but this is useless because text properties
`font-lock-face' can't be displayed when `font-lock-mode' is nil.

> and this bug#8084 should be closed?

I fixed comments and closed this bug.

Message #33 received at 8084 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: 8084 <at> debbugs.gnu.org
Cc: juri <at> jurta.org
Subject: Re: bug#8084: 24.0.50; grep still relies on font-lock somewhat
Date: Tue, 06 Sep 2011 14:42:53 -0400

> I now think that `grep-process-setup' should still check for
> `(null font-lock-mode)' to not output color escapes
> that can't be highlighted with `font-lock-face' by `grep-filter'.
> There is no harm to output color escapes because `grep-filter'
> still removes them, but this is useless because text properties
> `font-lock-face' can't be displayed when `font-lock-mode' is nil.

The (null font-lock-mode) test is an optimization.  It may provide more
reliable and slightly faster behavior for those people who don't want
the highlighting.

It does come with one downside, which is that enabling font-lock-mode
after the fact will not result in the matches being highlighted.
I'm not too worried about this downside, so either way is fine by me.


        Stefan

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