bug#9226: 23.3; [rgrep]; (matches found) ?

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* bug#9226: 23.3; [rgrep]; (matches found) ?
@ 2011-08-03  1:40 Dave Abrahams
  2011-08-10  7:16 ` Glenn Morris
  0 siblings, 1 reply; 9+ messages in thread
From: Dave Abrahams @ 2011-08-03  1:40 UTC (permalink / raw)
  To: 9226

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
gnus-group gnus-undo nnmail mail-source gnus-start gnus-spec gnus-int
gnus-range message format-spec rfc822 mml mml-sec mm-decode mm-bodies
mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mailabbrev
gmm-utils mailheader gnus-win gnus gnus-ems nnheader gnus-util time-date
mail-utils mm-util mail-prsvr maxframe zenburn ffap
system-type-darwin-theme .loaddefs term ehelp electric ring sort
find-dired disp-table enriched dired-x dired-aux gnus-load time-stamp
vc-git vc vc-dispatcher ediff-merg ediff-diff ediff-wind ediff-help
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
help-mode easymenu view autoload help-fns bytecomp byte-compile cl cl-19
dired regexp-opt easy-mmode paren server ido autorevert delsel cus-start
cus-load elhome tooltip ediff-hook vc-hooks lisp-float-type mwheel
mac-win tool-bar dnd fontset image fringe lisp-mode register page
menu-bar rfn-eshadow timer select scroll-bar mldrag 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 mac multi-tty make-network-process emacs)

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






^ permalink raw reply	[flat|nested] 9+ messages in thread

* bug#9226: 23.3; [rgrep]; (matches found) ?
  2011-08-03  1:40 bug#9226: 23.3; [rgrep]; (matches found) ? Dave Abrahams
@ 2011-08-10  7:16 ` Glenn Morris
  2011-08-10 13:35   ` Stefan Monnier
  0 siblings, 1 reply; 9+ messages in thread
From: Glenn Morris @ 2011-08-10  7:16 UTC (permalink / raw)
  To: Dave Abrahams; +Cc: 9226

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.

^ permalink raw reply	[flat|nested] 9+ messages in thread

* bug#9226: 23.3; [rgrep]; (matches found) ?
  2011-08-10  7:16 ` Glenn Morris
@ 2011-08-10 13:35   ` Stefan Monnier
  2011-08-10 15:10     ` Juri Linkov
  0 siblings, 1 reply; 9+ messages in thread
From: Stefan Monnier @ 2011-08-10 13:35 UTC (permalink / raw)
  To: Glenn Morris; +Cc: Dave Abrahams, 9226

>> 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





^ permalink raw reply	[flat|nested] 9+ messages in thread

* bug#9226: 23.3; [rgrep]; (matches found) ?
  2011-08-10 13:35   ` Stefan Monnier
@ 2011-08-10 15:10     ` Juri Linkov
  2011-08-17 14:52       ` Dave Abrahams
  0 siblings, 1 reply; 9+ messages in thread
From: Juri Linkov @ 2011-08-10 15:10 UTC (permalink / raw)
  To: Stefan Monnier; +Cc: Dave Abrahams, 9226

> 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".





^ permalink raw reply	[flat|nested] 9+ messages in thread

* bug#9226: 23.3; [rgrep]; (matches found) ?
  2011-08-10 15:10     ` Juri Linkov
@ 2011-08-17 14:52       ` Dave Abrahams
  2011-08-17 15:02         ` Lennart Borgman
  2011-08-17 16:50         ` Juri Linkov
  0 siblings, 2 replies; 9+ messages in thread
From: Dave Abrahams @ 2011-08-17 14:52 UTC (permalink / raw)
  To: Juri Linkov; +Cc: 9226


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





^ permalink raw reply	[flat|nested] 9+ messages in thread

* bug#9226: 23.3; [rgrep]; (matches found) ?
  2011-08-17 14:52       ` Dave Abrahams
@ 2011-08-17 15:02         ` Lennart Borgman
  2011-08-17 16:50         ` Juri Linkov
  1 sibling, 0 replies; 9+ messages in thread
From: Lennart Borgman @ 2011-08-17 15:02 UTC (permalink / raw)
  To: Dave Abrahams; +Cc: 9226

On Wed, Aug 17, 2011 at 16:52, Dave Abrahams <dave@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?





^ permalink raw reply	[flat|nested] 9+ messages in thread

* bug#9226: 23.3; [rgrep]; (matches found) ?
  2011-08-17 14:52       ` Dave Abrahams
  2011-08-17 15:02         ` Lennart Borgman
@ 2011-08-17 16:50         ` Juri Linkov
  2011-08-22  9:54           ` Juri Linkov
  2011-09-17 18:24           ` Juri Linkov
  1 sibling, 2 replies; 9+ messages in thread
From: Juri Linkov @ 2011-08-17 16:50 UTC (permalink / raw)
  To: Dave Abrahams; +Cc: 9226

> 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)))






^ permalink raw reply	[flat|nested] 9+ messages in thread

* bug#9226: 23.3; [rgrep]; (matches found) ?
  2011-08-17 16:50         ` Juri Linkov
@ 2011-08-22  9:54           ` Juri Linkov
  2011-09-17 18:24           ` Juri Linkov
  1 sibling, 0 replies; 9+ messages in thread
From: Juri Linkov @ 2011-08-22  9:54 UTC (permalink / raw)
  To: Dave Abrahams; +Cc: 9226-done

Fixed.





^ permalink raw reply	[flat|nested] 9+ messages in thread

* bug#9226: 23.3; [rgrep]; (matches found) ?
  2011-08-17 16:50         ` Juri Linkov
  2011-08-22  9:54           ` Juri Linkov
@ 2011-09-17 18:24           ` Juri Linkov
  1 sibling, 0 replies; 9+ messages in thread
From: Juri Linkov @ 2011-09-17 18:24 UTC (permalink / raw)
  To: 9226

> 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)))





^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2011-09-17 18:24 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-08-03  1:40 bug#9226: 23.3; [rgrep]; (matches found) ? Dave Abrahams
2011-08-10  7:16 ` Glenn Morris
2011-08-10 13:35   ` Stefan Monnier
2011-08-10 15:10     ` Juri Linkov
2011-08-17 14:52       ` Dave Abrahams
2011-08-17 15:02         ` Lennart Borgman
2011-08-17 16:50         ` Juri Linkov
2011-08-22  9:54           ` Juri Linkov
2011-09-17 18:24           ` Juri Linkov

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