* bug#17250: 24.3; find-variable gives search-failed error message
@ 2014-04-12 12:38 Johan Claesson
2018-04-17 22:58 ` Lars Ingebrigtsen
0 siblings, 1 reply; 5+ messages in thread
From: Johan Claesson @ 2014-04-12 12:38 UTC (permalink / raw)
To: 17250
Hi,
emacs -Q
(defvar foo nil) C-M-x
M-x find-variable RET foo RET
This gives the following error:
Search failed: "\x1fVfoo
"
Since foo is defined interactively in the *scratch* buffer emacs does
not know what file it belongs to. That is expected. I just think it
should say something like "Don't know where foo is defined" instead of
the above error message.
Same thing on todays bzr trunk (GNU Emacs 24.4.50.1 (i686-pc-linux-gnu,
GTK+ Version 3.8.6) of 2014-04-12 on goblin).
Regards,
/Johan
In GNU Emacs 24.3.6 (i686-pc-linux-gnu, GTK+ Version 3.8.6)
of 2014-04-06 on goblin
Windowing system distributor `The X.Org Foundation', version 11.0.11405000
System Description: Ubuntu 13.10
Configured using:
`configure '--prefix=/home/jcl/usr' '--without-toolkit-scroll-bars'
'-C' '--without-compress-info''
Important settings:
value of $LC_COLLATE: C
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
default enable-multibyte-characters: t
Major mode: Term
Minor modes in effect:
magit-auto-revert-mode: t
diff-auto-refine-mode: t
shell-dirtrack-mode: t
display-time-mode: t
minibuffer-depth-indicate-mode: t
which-function-mode: t
minibuffer-electric-default-mode: t
winner-mode: t
icomplete-mode: t
ido-everywhere: t
electric-layout-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
file-name-shadow-mode: t
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font-lock-mode: t
auto-composition-mode: t
auto-encryption-mode: t
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Recent input:
e m <tab> SPC - Q <return> <up> <return> C-h n q <up>
<return> <switch-frame> q 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 <return> / o <return> <home>
C-s f i n d - v a r <up> <up> <home> C-s s e a r c
h C-s C-s C-s <left> SPC N P q C-h i d m <backspace>
e m a <tab> C-g m e l i <tab> <return> i r e p o <tab>
<backspace> <backspace> <backspace> C-g d , e d m e
n a <tab> <backspace> <backspace> m a <tab> <return>
i r e p o <tab> r t <tab> i n g <tab> <return> <tab>
<return> C-h C-p <next> <home> C-s s e a r c h - f
<up> <M-next> <next> <prior> <home> <tab> <tab> M-x
l i s t y - <backspace> <backspace> - p a c <tab> <return>
C-s d e b b <left> i U x SPC <up> <switch-frame> C-h
i <C-tab> M-x d e b b u g <tab> g n u - e <backspace>
s e <tab> r a <tab> <backspace> <backspace> a r <tab>
<return> s e a r c h - f a i l e d <return> <return>
M-1 C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <return>
SPC n n q C-h m M-x <up> <return> f i n d - v a r i
a b l e <return> <return> q <next> <prior> <up> <up>
<up> <tab> <return> q C-h i l l <next> <next> <next>
<next> <next> <next> <next> <next> <home> <end> <prior>
<home> <end> <prior> <next> <home> C-1 C-1 e m a c
s SPC - Q <S-return> M-x r e p o r t - e m <tab> b
<tab> <return>
Recent messages:
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Type C-x 1 to delete the help window, C-M-v to scroll help.
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mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mailabbrev gmm-utils mailheader gnus gnus-ems nnheader
mail-utils jcl-keys-init diff-mode easy-mmode tagbag tramp tramp-compat
tramp-loaddefs cl-macs gv shell pcomplete format-spec windmove jcl-keys
jcl-global-init wc-mode time paren mic-paren printing ps-print ps-def
lpr uniquify mb-depth whitespace ffap url-parse auth-source eieio
gnus-util mm-util mail-prsvr password-cache url-vars byte-opt warnings
bytecomp byte-compile cconv saveplace jcl-imenu which-func imenu
jcl-copyright jcl-duff clearcase tq reporter cl minibuf-eldef winner
icomplete jcl-sl-init w3m browse-url doc-view jka-compr image-mode
timezone w3m-hist w3m-fb bookmark-w3m w3m-ems wid-edit w3m-ccl ccl
w3m-favicon w3m-image w3m-proc w3m-util jcl-misc jcl-ert ispell
thingatpt find-lisp comint ansi-color dired jcl-misc-lexical jcl-windows
ido ert find-func ewoc debug jcl-compile jcl-site-start jpt-mode
erlang-start jcl-elpa-init num3-mode jcl-compat-init term disp-table
ehelp electric ring sh-script smie executable jcl-times-init advice
help-fns advice-preload jcl-util jcl-times cl-lib server jcl-load-path
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deferred-autoloads dired-details-autoloads eimp-autoloads
el-mock-autoloads emms-autoloads epresent-autoloads erlang-autoloads
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gitconfig-mode-autoloads gitignore-mode-autoloads gnugo-autoloads
gnuplot-autoloads gnuplot-mode-autoloads haskell-mode-autoloads edmacro
kmacro htmlize-autoloads inf-ruby-autoloads ipython-autoloads
key-chord-autoloads keywiz-autoloads lib-requires-autoloads
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git-rebase-mode-autoloads git-commit-mode-autoloads
markdown-mode-autoloads mic-paren-autoloads mo-git-blame-autoloads
muse-autoloads nrepl-autoloads dash-autoloads clojure-mode-autoloads
num3-mode-autoloads org-present-autoloads org-autoloads outorg-autoloads
pkg-info-autoloads epl-autoloads popup-autoloads pysmell-autoloads
python-autoloads s-autoloads slime-autoloads finder-inf tabbar-autoloads
w3m-autoloads info easymenu web-autoloads yaoddmuse-autoloads package
time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
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
minibuffer loaddefs button faces cus-face macroexp files text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process dbusbind
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty emacs)
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#17250: 24.3; find-variable gives search-failed error message
2014-04-12 12:38 bug#17250: 24.3; find-variable gives search-failed error message Johan Claesson
@ 2018-04-17 22:58 ` Lars Ingebrigtsen
2018-04-18 6:23 ` Eli Zaretskii
2018-04-28 2:27 ` Noam Postavsky
0 siblings, 2 replies; 5+ messages in thread
From: Lars Ingebrigtsen @ 2018-04-17 22:58 UTC (permalink / raw)
To: Johan Claesson; +Cc: 17250
Johan Claesson <johanclaesson@bredband.net> writes:
> emacs -Q
> (defvar foo nil) C-M-x
> M-x find-variable RET foo RET
>
> This gives the following error:
>
> Search failed: "\x1fVfoo
> "
>
> Since foo is defined interactively in the *scratch* buffer emacs does
> not know what file it belongs to. That is expected. I just think it
> should say something like "Don't know where foo is defined" instead of
> the above error message.
The following patch fixes the problem.
Simplest test case: (help-C-file-name 'foo 'var)
But there are several places that use this function without checking the
return value. Are they relying on this function to bug out with a
cryptic error, or are they all confident that the file name can be
found?
So I haven't applied it yet. Perhaps somebody else will weigh in...
diff --git a/lisp/help-fns.el b/lisp/help-fns.el
index ec46a479ed..ab3fe3a732 100644
--- a/lisp/help-fns.el
+++ b/lisp/help-fns.el
@@ -169,7 +169,8 @@ describe-function
;;;###autoload
(defun help-C-file-name (subr-or-var kind)
"Return the name of the C file where SUBR-OR-VAR is defined.
-KIND should be `var' for a variable or `subr' for a subroutine."
+KIND should be `var' for a variable or `subr' for a subroutine.
+If we can't find the file name, nil is returned."
(let ((docbuf (get-buffer-create " *DOC*"))
(name (if (eq 'var kind)
(concat "V" (symbol-name subr-or-var))
@@ -181,19 +182,23 @@ help-C-file-name
(expand-file-name internal-doc-file-name doc-directory)))
(let ((file (catch 'loop
(while t
- (let ((pnt (search-forward (concat "\^_" name "\n"))))
- (re-search-backward "\^_S\\(.*\\)")
- (let ((file (match-string 1)))
- (if (member file build-files)
- (throw 'loop file)
- (goto-char pnt))))))))
- (if (string-match "^ns.*\\(\\.o\\|obj\\)\\'" file)
- (setq file (replace-match ".m" t t file 1))
- (if (string-match "\\.\\(o\\|obj\\)\\'" file)
- (setq file (replace-match ".c" t t file))))
- (if (string-match "\\.\\(c\\|m\\)\\'" file)
- (concat "src/" file)
- file)))))
+ (let ((pnt (search-forward (concat "\^_" name "\n") nil t)))
+ (if (not pnt)
+ (throw 'loop nil)
+ (re-search-backward "\^_S\\(.*\\)")
+ (let ((file (match-string 1)))
+ (if (member file build-files)
+ (throw 'loop file)
+ (goto-char pnt)))))))))
+ (if (not file)
+ nil
+ (if (string-match "^ns.*\\(\\.o\\|obj\\)\\'" file)
+ (setq file (replace-match ".m" t t file 1))
+ (if (string-match "\\.\\(o\\|obj\\)\\'" file)
+ (setq file (replace-match ".c" t t file))))
+ (if (string-match "\\.\\(c\\|m\\)\\'" file)
+ (concat "src/" file)
+ file))))))
(defcustom help-downcase-arguments nil
"If non-nil, argument names in *Help* buffers are downcased."
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
^ permalink raw reply related [flat|nested] 5+ messages in thread* bug#17250: 24.3; find-variable gives search-failed error message
2018-04-17 22:58 ` Lars Ingebrigtsen
@ 2018-04-18 6:23 ` Eli Zaretskii
2018-04-28 2:27 ` Noam Postavsky
1 sibling, 0 replies; 5+ messages in thread
From: Eli Zaretskii @ 2018-04-18 6:23 UTC (permalink / raw)
To: Lars Ingebrigtsen; +Cc: 17250
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Wed, 18 Apr 2018 00:58:39 +0200
> Cc: 17250@debbugs.gnu.org
>
> But there are several places that use this function without checking the
> return value. Are they relying on this function to bug out with a
> cryptic error, or are they all confident that the file name can be
> found?
>
> So I haven't applied it yet. Perhaps somebody else will weigh in...
I'm not weighing in ;-)
> (defun help-C-file-name (subr-or-var kind)
> "Return the name of the C file where SUBR-OR-VAR is defined.
> -KIND should be `var' for a variable or `subr' for a subroutine."
> +KIND should be `var' for a variable or `subr' for a subroutine.
> +If we can't find the file name, nil is returned."
^^^^^^^^^^^^^^^
"return nil". We try to avoid passive tense.
^ permalink raw reply [flat|nested] 5+ messages in thread* bug#17250: 24.3; find-variable gives search-failed error message
2018-04-17 22:58 ` Lars Ingebrigtsen
2018-04-18 6:23 ` Eli Zaretskii
@ 2018-04-28 2:27 ` Noam Postavsky
2019-06-26 14:06 ` Lars Ingebrigtsen
1 sibling, 1 reply; 5+ messages in thread
From: Noam Postavsky @ 2018-04-28 2:27 UTC (permalink / raw)
To: Lars Ingebrigtsen; +Cc: 17250
Lars Ingebrigtsen <larsi@gnus.org> writes:
> But there are several places that use this function without checking the
> return value. Are they relying on this function to bug out with a
> cryptic error, or are they all confident that the file name can be
> found?
>
> So I haven't applied it yet. Perhaps somebody else will weigh in...
I think it's okay. Here's my analysis of the call-sites found by M-x
rgrep:
./help-fns.el:163:;; (defun help-C-file-name (subr-or-var kind)
./help-fns.el:170:(defun help-C-file-name (subr-or-var kind)
./help-fns.el:319: (help-C-file-name type 'subr)
./help-fns.el:325: (help-C-file-name object 'var)
These 2 are in the return value position of
`find-lisp-object-file-name', whose docstring says "If no suitable file
is found, return nil".
./emacs-lisp/find-func.el:436: (help-C-file-name def 'subr))
This one is only called if `def' satisfies `subrp', so I think failing
to find it can't happen anyway.
./emacs-lisp/find-func.el:555: (help-C-file-name variable 'var))))
This one is in find-variable-noselect. Before your change, it would
throw (search-failed "\037Vfoo\n"), with your change it throws (error
"Don’t know where ‘foo’ is defined") which seems better.
./progmodes/elisp-mode.el:693: (push (elisp--xref-make-xref nil symbol (help-C-file-name (symbol-function symbol) 'subr)) xrefs))
./progmodes/elisp-mode.el:770: ;; yet; help-C-file-name does that. Second call will
./progmodes/elisp-mode.el:772: (push (elisp--xref-make-xref 'defvar symbol (help-C-file-name symbol 'var)) xrefs))
./ldefs-boot.el:15592:(autoload 'help-C-file-name "help-fns" "\
./help-mode.el:203: (help-C-file-name (indirect-function fun) 'fun)))
./help-mode.el:243: (setq file (help-C-file-name var 'var)))
As far as I can tell, all of these calls only happen if the symbol has
already been found by `find-lisp-object-file-name', so they won't
trigger the failure case.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2019-06-26 14:06 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2014-04-12 12:38 bug#17250: 24.3; find-variable gives search-failed error message Johan Claesson
2018-04-17 22:58 ` Lars Ingebrigtsen
2018-04-18 6:23 ` Eli Zaretskii
2018-04-28 2:27 ` Noam Postavsky
2019-06-26 14:06 ` Lars Ingebrigtsen
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