GNU bug report logs - #9226
23.3; [rgrep]; (matches found) ?

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

From: Dave Abrahams <dave <at> boostpro.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 23.3; [rgrep]; (matches found) ?
Date: Tue, 02 Aug 2011 21:40:31 -0400

Here's the output of an *unsuccessful* `M-x rgrep'

--8<---------------cut here---------------start------------->8---
-*- mode: grep; default-directory: "/Users/dave/.emacs.d/el-get/dwamacs/" -*-
Grep started at Tue Aug  2 21:35:56

find . \( -path \*/SCCS -o -path \*/RCS -o -path \*/CVS -o -path \*/MCVS -o -path \*/.svn -o -path \*/.git -o -path \*/.hg -o -path \*/.bzr -o -path \*/_MTN -o -path \*/_darcs -o -path \*/\{arch\} \) -prune -o \( -name .\#\* -o -name \*.o -o -name \*\~ -o -name \*.bin -o -name \*.lbin -o -name \*.so -o -name \*.a -o -name \*.ln -o -name \*.blg -o -name \*.bbl -o -name \*.elc -o -name \*.lof -o -name \*.glo -o -name \*.idx -o -name \*.lot -o -name \*.fmt -o -name \*.tfm -o -name \*.class -o -name \*.fas -o -name \*.lib -o -name \*.mem -o -name \*.x86f -o -name \*.sparcf -o -name \*.fasl -o -name \*.ufsl -o -name \*.fsl -o -name \*.dxl -o -name \*.pfsl -o -name \*.dfsl -o -name \*.p64fsl -o -name \*.d64fsl -o -name \*.dx64fsl -o -name \*.lo -o -name \*.la -o -name \*.gmo -o -name \*.mo -o -name \*.toc -o -name \*.aux -o -name \*.cp -o -name \*.fn -o -name \*.ky -o -name \*.pg -o -name \*.tp -o -name \*.vr -o -name \*.cps -o -name \*.fns -o -name \*.kys -o -name \*.pgs -o -name \*.tps -o -name \*.vrs -o -name \*.pyc -o -name \*.pyo \) -prune -o  -type f \( -iname \*.py \) -exec grep -i -nH -e elscreen {} /dev/null \;

Grep finished (matches found) at Tue Aug  2 21:35:56
--8<---------------cut here---------------end--------------->8---

Why does emacs tell me "matches found" when none actually were?


In GNU Emacs 23.3.1 (x86_64-apple-darwin10.8.0, Carbon Version 1.6.0 AppKit 1038.36)
 of 2011-08-01 on vulcan
Windowing system distributor `Apple Inc.', version 10.6.8
configured using `configure  '--enable-mac-app=/Applications/Misc' '--prefix=/usr/local/stow/emacs-23.3' '--with-mac' 'CFLAGS=-O3' 'CPPFLAGS=-I/opt/local/include' 'LDFLAGS=-L/opt/local/lib''

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: nil
  value of $XMODIFIERS: nil
  locale-coding-system: iso-latin-1-unix
  default enable-multibyte-characters: t

Major mode: Grep

Minor modes in effect:
  diff-auto-refine-mode: t
  shell-dirtrack-mode: t
  me-minor-mode: t
  show-paren-mode: t
  server-mode: t
  ido-everywhere: t
  global-auto-revert-mode: t
  delete-selection-mode: t
  tooltip-mode: t
  mac-mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Recent input:
g C-a - <tab> C-e C-a r e p <tab> - <tab> <return> 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-s T o C-n C-a C-n C-. C-. C-. C-. C-. 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-, C-, C-, 
C-n C-. C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-p 
C-, C-p C-p C-p M-x r e p <tab> o r <tab> - <tab> i 
n <tab> f o C-g C-n C-n C-n C-e C-b C-x C-e C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n SPC C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-e C-n 
C-n C-n C-n C-n C-n C-n C-p C-, C-, C-, C-, C-, <return> 
C-n C-p C-p C-n C-x C-k C-x C-b M-x b u g - g n u <tab> 
- e m a c s C-g M-x r e p o r t - e m <tab> <retur
n>

Recent messages:
Auto-saving...done
Mark set
Grep finished (matches found)
Mark activated
Making completion list...
uncompressing emacsbug.el.gz...done
Mark saved where search started
Making completion list...
Quit
nil
Quit

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Features:
(shadow emacsbug crm grep python-21 python texinfo nroff-mode make-mode
face-remap two-column iso-transl pp alist pym static apel-ver product
elscreen boxquote rect cus-edit conf-mode ange-ftp url-ftp url-file
url-dired pcomplete compile magit diff-mode log-edit pcvs-util add-log
magit-bisect magit-key-mode whitespace tar-mode jka-compr dabbrev
multi-isearch git-modeline git-emacs gnus-dired mule-util gnus-html
browse-url xml mm-url gnus-fun sendmail newcomment tramp-imap tramp-gw
tramp-fish tramp-smb tramp-cache tramp-ftp tramp-cmds tramp shell comint
tramp-compat trampver debug flow-fill url-http url-auth url-gw
gnus-picon smiley ansi-color gnus-async gnus-bcklg qp gnus-ml nnfolder
w3m-load gnus-topic nndraft nnmh utf-7 epa-file epa derived epg rot13
auth-source proto-stream starttls nnimap parse-time tls utf7 netrc
gnus-agent gnus-srvr gnus-score score-mode nnvirtual nntp gnus-cache
gnus-cite gnus-registry registry eieio-base eieio spam spam-stat gnus-uu
yenc gnus-msg gnus-gravatar mail-extr gnus-art mm-uu mml2015 epg-config
mm-view mml-smime smime password-cache dig gravatar url-cache url
url-proxy url-privacy url-expand url-methods url-history url-cookie
url-util url-parse url-vars mailcap nnir gnus-sum macroexp nnoo
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ediff-util ediff-mult ediff-init ediff edmacro kmacro assoc org-install
thingatpt noutline outline info color-theme wid-edit byte-code-cache
byte-opt warnings initsplit advice advice-preload find-func el-get
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dired regexp-opt easy-mmode paren server ido autorevert delsel cus-start
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case-table epa-hook jka-cmpr-hook help simple abbrev loaddefs button
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-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com

Message #8 received at 9226 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Dave Abrahams <dave <at> boostpro.com>
Cc: 9226 <at> debbugs.gnu.org
Subject: Re: bug#9226: 23.3; [rgrep]; (matches found) ?
Date: Wed, 10 Aug 2011 03:16:00 -0400

Dave Abrahams wrote:

> Why does emacs tell me "matches found" when none actually were?

Because it uses the exit status of the "grep" command to decide whether
matches were found. For standalone grep, an exit status of 0 means
matches were found; but for "find -exec grep", an exit status of 0 just
means "all files were processed successfully". There isn't any way to
determine whether the grep in a "find -exec grep" succeeded based on
exit status alone, therefore this Emacs feature as implemented cannot
work for rgrep. With "find | xargs grep" it will do slightly better, but
still report "exited abnormally" for the case of a grep that ran fine,
but did not find any matches.

Message #11 received at 9226 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Glenn Morris <rgm <at> gnu.org>
Cc: Dave Abrahams <dave <at> boostpro.com>, 9226 <at> debbugs.gnu.org
Subject: Re: bug#9226: 23.3; [rgrep]; (matches found) ?
Date: Wed, 10 Aug 2011 09:35:55 -0400

>> Why does emacs tell me "matches found" when none actually were?
> Because it uses the exit status of the "grep" command to decide whether
> matches were found. For standalone grep, an exit status of 0 means
> matches were found; but for "find -exec grep", an exit status of 0 just
> means "all files were processed successfully". There isn't any way to
> determine whether the grep in a "find -exec grep" succeeded based on
> exit status alone, therefore this Emacs feature as implemented cannot
> work for rgrep. With "find | xargs grep" it will do slightly better, but
> still report "exited abnormally" for the case of a grep that ran fine,
> but did not find any matches.

I suggest we remove this "matches found" thingy.  It was meant to be
a feature, but in the case where it works (i.e. for `grep') the rest of
the output already gives the information anyway.
We can replace it with the exit status code instead: it's more cryptic
but at least it never lies.


        Stefan

Message #14 received at 9226 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> jurta.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Dave Abrahams <dave <at> boostpro.com>, Glenn Morris <rgm <at> gnu.org>,
	9226 <at> debbugs.gnu.org
Subject: Re: bug#9226: 23.3; [rgrep]; (matches found) ?
Date: Wed, 10 Aug 2011 18:10:27 +0300

> I suggest we remove this "matches found" thingy.  It was meant to be
> a feature, but in the case where it works (i.e. for `grep') the rest of
> the output already gives the information anyway.
>
> We can replace it with the exit status code instead: it's more cryptic
> but at least it never lies.

It would be too bad to lose this useful feature that helps
to quickly see the status in the last line of the output
and in the mode line.

What we definitely know now is that:

GREP EXIT STATUS
       The exit status is 0 if selected lines are found,
       and 1 if not found.  If an error occurred the exit status is 2.
       (Note: POSIX error handling code should check for '2' or greater.)

FIND EXIT STATUS
       find exits with status 0 if all files are processed successfully,
       greater than 0 if errors occur.  This is deliberately a very
       broad description, but if the return value is non-zero, you
       should not rely on the correctness of the results of find.

XARGS EXIT STATUS
       0 if it succeeds
       123 if any invocation of the command exited with status 1-125
       124 if the command exited with status 255
       125 if the command is killed by a signal
       126 if the command cannot be run
       127 if the command is not found
       1 if some other error occurred.

and currently process the following cases in grep.el:

  0 finished (matches found)
  1 finished with no matches found
  * exited abnormally with code %d

So to never lie to the users and determine reliably
the status we could use the following logic:

  If status is 0 and the output is not empty:
    Grep finished (matches found)

  Otherwise:
    Grep exited with status %d

These changes completely remove the case of status 1 that displayed
"finished with no matches found", and also remove the word "abnormally"
from the message of remaining cases, because we can't reliably determine
the case of "no matches found" by checking status 123 of a command line
that contains "xargs".

Message #17 received at 9226 <at> debbugs.gnu.org (full text, mbox):

From: Dave Abrahams <dave <at> boostpro.com>
To: Juri Linkov <juri <at> jurta.org>
Cc: Glenn Morris <rgm <at> gnu.org>, 9226 <at> debbugs.gnu.org,
	Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#9226: 23.3; [rgrep]; (matches found) ?
Date: Wed, 17 Aug 2011 10:52:44 -0400

on Wed Aug 10 2011, Juri Linkov <juri-AT-jurta.org> wrote:

> So to never lie to the users and determine reliably
> the status we could use the following logic:
>
>   If status is 0 and the output is not empty:
>     Grep finished (matches found)
>
>   Otherwise:
>     Grep exited with status %d
>
> These changes completely remove the case of status 1 that displayed
> "finished with no matches found", and also remove the word "abnormally"
> from the message of remaining cases, because we can't reliably determine
> the case of "no matches found" by checking status 123 of a command line
> that contains "xargs".

Sounds like an improvement to me.

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com

Message #20 received at 9226 <at> debbugs.gnu.org (full text, mbox):

From: Lennart Borgman <lennart.borgman <at> gmail.com>
To: Dave Abrahams <dave <at> boostpro.com>
Cc: Juri Linkov <juri <at> jurta.org>, 9226 <at> debbugs.gnu.org
Subject: Re: bug#9226: 23.3; [rgrep]; (matches found) ?
Date: Wed, 17 Aug 2011 17:02:17 +0200

On Wed, Aug 17, 2011 at 16:52, Dave Abrahams <dave <at> boostpro.com> wrote:
>
> on Wed Aug 10 2011, Juri Linkov <juri-AT-jurta.org> wrote:
>
>> So to never lie to the users and determine reliably
>> the status we could use the following logic:
>>
>>   If status is 0 and the output is not empty:
>>     Grep finished (matches found)
>>
>>   Otherwise:
>>     Grep exited with status %d
>>
>> These changes completely remove the case of status 1 that displayed
>> "finished with no matches found", and also remove the word "abnormally"
>> from the message of remaining cases, because we can't reliably determine
>> the case of "no matches found" by checking status 123 of a command line
>> that contains "xargs".
>
> Sounds like an improvement to me.

Is it the status of the grep program that is shown, or? Maybe this
should be clarified?

Message #23 received at 9226 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> jurta.org>
To: Dave Abrahams <dave <at> boostpro.com>
Cc: Glenn Morris <rgm <at> gnu.org>, 9226 <at> debbugs.gnu.org,
	Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#9226: 23.3; [rgrep]; (matches found) ?
Date: Wed, 17 Aug 2011 19:50:00 +0300

> Sounds like an improvement to me.

This patch below fixes the case you reported and also the case of
"find | xargs grep" because it checks the value of buffer-modified
set in `compilation-start', whereas empty output doesn't change it.
It still relies on unreliable heuristics, but I carefully tested it with
all known test cases and it displays correct messages in all of them.
Running grep on the dir with a file containing "test", I get the following
results (command and exit status message):

grep -inH -e "test" *
Grep finished (matches found)

grep -inH -e "testx" *
Grep finished with no matches found

grepx -inH -e "test" *
Grep exited abnormally with code 127

find . -exec grep -i test {} \;
Grep finished (matches found)

find . -exec grep -i testx {} \;
Grep finished with no matches found

find . -name testx -exec grep -i testx {} \;
Grep finished with no matches found

find . -print0 | xargs -0 -e grep -i -nH -e test
Grep finished (matches found)

find . -print0 | xargs -0 -e grep -i -nH -e testx
Grep finished with no matches found

=== modified file 'lisp/progmodes/grep.el'
--- lisp/progmodes/grep.el	2011-08-10 20:31:17 +0000
+++ lisp/progmodes/grep.el	2011-08-17 16:47:24 +0000
@@ -463,9 +463,9 @@ (defun grep-process-setup ()
   (set (make-local-variable 'compilation-exit-message-function)
        (lambda (status code msg)
 	 (if (eq status 'exit)
-	     (cond ((zerop code)
+	     (cond ((and (zerop code) (buffer-modified-p))
 		    '("finished (matches found)\n" . "matched"))
-		   ((= code 1)
+		   ((or (= code 1) (not (buffer-modified-p)))
 		    '("finished with no matches found\n" . "no match"))
 		   (t
 		    (cons msg code)))

Message #28 received at 9226-done <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> jurta.org>
To: Dave Abrahams <dave <at> boostpro.com>
Cc: 9226-done <at> debbugs.gnu.org
Subject: Re: bug#9226: 23.3; [rgrep]; (matches found) ?
Date: Mon, 22 Aug 2011 12:54:27 +0300

Fixed.

Message #31 received at 9226 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> jurta.org>
To: 9226 <at> debbugs.gnu.org
Subject: Re: bug#9226: 23.3; [rgrep]; (matches found) ?
Date: Sat, 17 Sep 2011 21:24:16 +0300

> grep -inH -e "test" *
> Grep finished (matches found)
>
> grep -inH -e "testx" *
> Grep finished with no matches found
>
> grepx -inH -e "test" *
> Grep exited abnormally with code 127
>
> find . -exec grep -i test {} \;
> Grep finished (matches found)
>
> find . -exec grep -i testx {} \;
> Grep finished with no matches found
>
> find . -name testx -exec grep -i testx {} \;
> Grep finished with no matches found
>
> find . -print0 | xargs -0 -e grep -i -nH -e test
> Grep finished (matches found)
>
> find . -print0 | xargs -0 -e grep -i -nH -e testx
> Grep finished with no matches found
>
> === modified file 'lisp/progmodes/grep.el'
> --- lisp/progmodes/grep.el	2011-08-10 20:31:17 +0000
> +++ lisp/progmodes/grep.el	2011-08-17 16:47:24 +0000
> @@ -463,9 +463,9 @@ (defun grep-process-setup ()
>    (set (make-local-variable 'compilation-exit-message-function)
>         (lambda (status code msg)
>  	 (if (eq status 'exit)
> -	     (cond ((zerop code)
> +	     (cond ((and (zerop code) (buffer-modified-p))
>  		    '("finished (matches found)\n" . "matched"))
> -		   ((= code 1)
> +		   ((or (= code 1) (not (buffer-modified-p)))

Another use-case:

find . -exec zgrep -inH test {} \;
./file1:1:Test #1
Grep finished (matches found)

find . -exec zgrep -inH test {} +
./file1:1:Test #1
Grep finished with no matches found

The latter's message is wrong because zgrep returns 1
when matches are found successfully.

The following patch provides more reliable message
"Grep exited abnormally with code 1" and still works
correctly for other cases:

--- lisp/progmodes/grep.el	2011-09-08 21:04:30 +0000
+++ lisp/progmodes/grep.el	2011-09-17 18:20:31 +0000
@@ -478,7 +478,7 @@ (defun grep-process-setup ()
 	     ;; so the buffer is still unmodified if there is no output.
 	     (cond ((and (zerop code) (buffer-modified-p))
 		    '("finished (matches found)\n" . "matched"))
-		   ((or (= code 1) (not (buffer-modified-p)))
+		   ((not (buffer-modified-p))
 		    '("finished with no matches found\n" . "no match"))
 		   (t
 		    (cons msg code)))

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