Package: emacs;
Reported by: Dave Abrahams <dave <at> boostpro.com>
Date: Tue, 4 Sep 2012 19:06:01 UTC
Severity: normal
Found in version 24.1
Done: Chong Yidong <cyd <at> gnu.org>
Bug is archived. No further changes may be made.
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bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Tue, 04 Sep 2012 19:06:02 GMT) Full text and rfc822 format available.Dave Abrahams <dave <at> boostpro.com>:bug-gnu-emacs <at> gnu.org.
(Tue, 04 Sep 2012 19:06:02 GMT) Full text and rfc822 format available.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: 24.1; parse-colon-path turns empty paths into nil Date: Tue, 04 Sep 2012 11:58:53 -0700
Please describe exactly what actions triggered the bug, and the precise symptoms of the bug. If you can, give a recipe starting from `emacs -Q': (parse-colon-path ":") yields (nil nil) but there's nothing in the docstring to indicate that empty path entries will get turned into nil. Either the docstring needs to be updated, or parse-colon-path should return (delq nil cd-list). In GNU Emacs 24.1.1 (x86_64-apple-darwin11.4.0, Carbon Version 1.6.0 AppKit 1138.47) of 2012-06-27 on pluto.luannocracy.com Windowing system distributor `Apple Inc.', version 10.7.4 Configured using: `configure '--prefix=/opt/local' '--without-x' '--without-dbus' '--without-gconf' '--without-libotf' '--without-m17n-flt' '--without-gpm' '--infodir' '/opt/local/share/info/emacs24-macport' '--with-mac' '--enable-mac-app=/opt/local/var/macports/build/_Users_dave_Public_MacPorts_Portfiles_editors_emacs24-macport/emacs24-macport/work/destroot/Applications/MacPorts' 'CC=/usr/bin/clang' 'CFLAGS=-pipe -O2 -arch x86_64' 'LDFLAGS=-L/opt/local/lib -Wl,-no_pie -arch x86_64' 'CPPFLAGS=-I/opt/local/include'' 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: Emacs-Lisp Minor modes in effect: recentf-mode: t highlight-changes-visible-mode: t diff-auto-refine-mode: t shell-dirtrack-mode: t pretty-control-l-mode: t Info-breadcrumbs-in-mode-line-mode: t workgroups-mode: t eproject-mode: t me-minor-mode: t which-function-mode: t show-paren-mode: t server-mode: t ido-everywhere: t global-ede-mode: t ede-minor-mode: t global-auto-revert-mode: t display-time-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-composition-mode: t auto-encryption-mode: t auto-compression-mode: t line-number-mode: t transient-mark-mode: t Recent input: C-a C-p C-p C-p C-k C-k 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-a <return> C-y C-p <tab> C-n C-k C-n C-e C-n C-p <return> ; ; SPC R e p l a c e SPC t h e SPC v e r i s o n <backspace> <backspace> <backspace> <backspace> s i o n SPC i n SPC o s x - p l i s t SPC w i t h SPC o n e SPC t h a t SPC r e s p e c t s SPC p a t h <M-backspace> t h e SPC o r d e r i n g SPC o f SPC P A T H C-, # <S-backspace> $ M-q C-n C-p C-p C-. SPC o f SPC o s x - p l i s t - u p M-/ M-q C-SPC C-. C-. C-. <backspace> C-a C-. C-. C-. C-SPC C-, i m p l e m e n t a t i o n M-q C-n C-e SPC p r i m a r i l y , SPC a n d SPC e d n <backspace> <backspace> <backspace> a p p e n d s SPC m i s s i n g SPC e l e m e n t s SPC f r o m SPC t h e SPC e x i s t i n g SPC e x e c - p a t h M-q C-n C-n C-n C-p C-n C-, C-, C-, C-s C-w C-. C-, C-b ( d e l q SPC n i l SPC ( p a r s e M-/ SPC C-e ) M-x r e p <tab> o <tab> r t - e m <tab> <return> Recent messages: Mark set Error during redisplay: (wrong-type-argument arrayp nil) [89 times] Auto-saving...done Error during redisplay: (wrong-type-argument arrayp nil) [39 times] Mark saved where search started Error during redisplay: (wrong-type-argument arrayp nil) [15 times] Making completion list... Error during redisplay: (wrong-type-argument arrayp nil) [2 times] Making completion list... 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/Users/dave/.emacs.d/el-get/org-mode/.dir-locals hides /opt/local/share/emacs/24.1/lisp/gnus/.dir-locals /Users/dave/.emacs.d/el-get/dwamacs/site-lisp/ert hides /opt/local/share/emacs/24.1/lisp/emacs-lisp/ert /Users/dave/.emacs.d/el-get/dwamacs/site-lisp/ert-x hides /opt/local/share/emacs/24.1/lisp/emacs-lisp/ert-x /Users/dave/.emacs.d/el-get/nognus/lisp/time-date hides /opt/local/share/emacs/24.1/lisp/calendar/time-date /Users/dave/.emacs.d/el-get/nognus/lisp/parse-time hides /opt/local/share/emacs/24.1/lisp/calendar/parse-time /Users/dave/.emacs.d/el-get/semi/site-lisp/semi/pgg hides /opt/local/share/emacs/24.1/lisp/obsolete/pgg /Users/dave/.emacs.d/el-get/semi/site-lisp/semi/pgg-pgp5 hides /opt/local/share/emacs/24.1/lisp/obsolete/pgg-pgp5 /Users/dave/.emacs.d/el-get/semi/site-lisp/semi/pgg-pgp hides /opt/local/share/emacs/24.1/lisp/obsolete/pgg-pgp /Users/dave/.emacs.d/el-get/semi/site-lisp/semi/pgg-parse hides /opt/local/share/emacs/24.1/lisp/obsolete/pgg-parse /Users/dave/.emacs.d/el-get/semi/site-lisp/semi/pgg-gpg hides /opt/local/share/emacs/24.1/lisp/obsolete/pgg-gpg /Users/dave/.emacs.d/el-get/semi/site-lisp/semi/pgg-def hides /opt/local/share/emacs/24.1/lisp/obsolete/pgg-def Features: (shadow emacsbug sh-script executable code-settings debug dired-aux dabbrev magit-bisect magit-key-mode magit log-edit pcvs-util shr-color color nnfolder newcomment recentf tree-widget hl-line find-dired grep+ grep-ed hilit-chg grep compile+ compile compile- multi-isearch diff-mode vc-git dot-org-el org-checklist ob-python ob-R ox-redmine ox-org org-x ox-plugin org-devonthink org-habit org-agenda org-info org-id ob-sh shell org ob-emacs-lisp ob-tangle ob-ref ob-lob ob-table org-footnote org-src ob-comint ob-keys ob ob-eval org-pcomplete pcomplete comint org-list org-faces org-compat org-entities org-macs noutline outline cal-menu calendar cal-loaddefs ede/dired unsafep gnus-dired shr browse-url mule-util url-http url-auth url-gw sort smiley ansi-color flow-fill qp mm-archive gnus-async gnus-bcklg gnus-salt gnus-dup gnus-ml gnus-topic nndraft nnmh utf-7 epa-file epa epg gnutls network-stream nnimap parse-time tls utf7 netrc gnus-agent gnus-srvr gnus-score score-mode nnvirtual nntp gnus-cache dot-gnus-el mail-settings gnus-cite w3m-load spam spam-stat gnus-uu yenc gnus-msg gnus-gravatar mail-extr gravatar url-cache gnus-registry registry gnus-art mm-uu mml2015 epg-config mm-view mml-smime smime dig gnus-sum nnoo gnus-group gnus-undo nnmail mail-source gnus-start gnus-spec gnus-win gnus-int gnus-range pgg pgg-parse mel path-util mime-def mcharset mcs-20 mcs-e20 pces pces-e20 pces-20 pcustom pccl pccl-20 ccl broken poe pgg-def luna calist alist pym static apel-ver product starttls gnus-harvest message idna format-spec rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader mailalias sendmail rfc2047 rfc2045 ietf-drums gnus gnus-ems gnus-compat url url-proxy url-privacy url-expand url-methods url-history url-cookie url-util url-parse auth-source password-cache url-vars mailcap nnheader gnus-util mail-utils mm-util mail-prsvr company-autoloads weblogger-autoloads xml-rpc-autoloads maxframe per-window-point page-ext disp-table pp-c-l ws-trim ffap session-settings session info+ fit-frame strings misc-fns thingatpt+ system-type-darwin-theme osx-plist xml dot-passwd-el .loaddefs xcscope workgroups shime php-mode add-log etags cc-langs org-install gnus-load mo-git-blame eproject-extras ibuf-macs ibuf-ext ibuffer iswitchb eproject ring esh-var esh-io esh-cmd esh-ext esh-proc esh-arg eldoc esh-groups eshell esh-module esh-mode esh-util edg modal cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs yasnippet dropdown-list derived edmacro kmacro initsplit warnings advice advice-preload cus-edit find-func diminish cmake-mode thingatpt el-get el-get-autoloads el-get-list-packages el-get-notify help-mode view el-get-dependencies el-get-build el-get-status pp el-get-recipes el-get-byte-compile el-get-methods el-get-fossil el-get-svn el-get-pacman el-get-github-zip el-get-github-tar el-get-http-zip el-get-http-tar el-get-hg el-get-git-svn el-get-fink el-get-emacswiki el-get-http el-get-emacsmirror el-get-github el-get-git el-get-elpa package tabulated-list el-get-darcs el-get-cvs el-get-bzr el-get-brew el-get-builtin el-get-apt-get el-get-custom el-get-core autoload help-fns cl dired-x dired regexp-opt easy-mmode jka-compr info ede/linux ede/emacs ede/cpp-root which-func imenu paren server ido ede/speedbar ede/files ede ede/base ede/auto ede/source eieio-base eieio-speedbar speedbar sb-image ezimage dframe easymenu assoc eieio-custom wid-edit eieio byte-opt bytecomp byte-compile cconv macroexp cedet autorevert time delsel cus-start cus-load elhome time-date 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 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 files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote mac multi-tty make-network-process emacs) -- Dave Abrahams BoostPro Computing Software Development Training http://www.boostpro.com Clang/LLVM/EDG Compilers C++ Boost
bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Sun, 16 Sep 2012 16:00:02 GMT) Full text and rfc822 format available.Message #8 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Chong Yidong <cyd <at> gnu.org> To: Dave Abrahams <dave <at> boostpro.com> Cc: 12351 <at> debbugs.gnu.org Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Sun, 16 Sep 2012 23:57:48 +0800
Dave Abrahams <dave <at> boostpro.com> writes: > (parse-colon-path ":") yields (nil nil) but there's nothing in the > docstring to indicate that empty path entries will get turned into nil. > Either the docstring needs to be updated, or parse-colon-path should > return (delq nil cd-list). Fixed in trunk, thanks.
Chong Yidong <cyd <at> gnu.org>
to control <at> debbugs.gnu.org.
(Sun, 16 Sep 2012 16:00:02 GMT) Full text and rfc822 format available.Debbugs Internal Request <help-debbugs <at> gnu.org>
to internal_control <at> debbugs.gnu.org.
(Mon, 15 Oct 2012 11:24:03 GMT) Full text and rfc822 format available.Glenn Morris <rgm <at> gnu.org>
to control <at> debbugs.gnu.org.
(Sun, 30 Dec 2012 18:49:02 GMT) Full text and rfc822 format available.bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Sun, 30 Dec 2012 18:54:01 GMT) Full text and rfc822 format available.Message #17 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Glenn Morris <rgm <at> gnu.org> To: Dave Abrahams <dave <at> boostpro.com> Cc: 12351 <at> debbugs.gnu.org Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Sun, 30 Dec 2012 13:52:11 -0500
Dave Abrahams wrote: > (parse-colon-path ":") yields (nil nil) but there's nothing in the > docstring to indicate that empty path entries will get turned into nil. > Either the docstring needs to be updated, or parse-colon-path should > return (delq nil cd-list). Making a change equivalent to the latter has caused http://debbugs.gnu.org/13296 Obviously we need the nils to remain, so I will put them back and just mention that empty elements return nil. It's not worth handling the minor aesthetic annoyance of (nil nil) specially.
bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Sun, 30 Dec 2012 19:55:02 GMT) Full text and rfc822 format available.Message #20 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Dave Abrahams <dave <at> boostpro.com> To: Glenn Morris <rgm <at> gnu.org> Cc: 12351 <at> debbugs.gnu.org Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Sun, 30 Dec 2012 14:53:44 -0500
on Sun Dec 30 2012, Glenn Morris <rgm-AT-gnu.org> wrote: > Dave Abrahams wrote: > >> (parse-colon-path ":") yields (nil nil) but there's nothing in the >> docstring to indicate that empty path entries will get turned into nil. >> Either the docstring needs to be updated, or parse-colon-path should >> return (delq nil cd-list). > > Making a change equivalent to the latter has caused > > http://debbugs.gnu.org/13296 > > Obviously we need the nils to remain, so I will put them back and just > mention that empty elements return nil. It's not worth handling the > minor aesthetic annoyance of (nil nil) specially. FWIW, I disagree. IMO you should at least consider fixing eshell and any other things that break because of this change. This discontinuity in behavior is not merely aesthetic; it makes parse-colon-path difficult to use correctly and leads to hard-to-find bugs in any code that fails to account for the possible nils. -- Dave Abrahams BoostPro Computing Software Development Training http://www.boostpro.com Clang/LLVM/EDG Compilers C++ Boost
bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Sun, 30 Dec 2012 20:24:01 GMT) Full text and rfc822 format available.Message #23 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: Dave Abrahams <dave <at> boostpro.com> Cc: rgm <at> gnu.org, 12351 <at> debbugs.gnu.org Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Sun, 30 Dec 2012 22:22:09 +0200
> From: Dave Abrahams <dave <at> boostpro.com> > Date: Sun, 30 Dec 2012 14:53:44 -0500 > Cc: 12351 <at> debbugs.gnu.org > > > Obviously we need the nils to remain, so I will put them back and just > > mention that empty elements return nil. It's not worth handling the > > minor aesthetic annoyance of (nil nil) specially. > > FWIW, I disagree. IMO you should at least consider fixing eshell and any > other things that break because of this change. This discontinuity in > behavior is not merely aesthetic; it makes parse-colon-path difficult to > use correctly and leads to hard-to-find bugs in any code that fails to > account for the possible nils. This whole discussion is rather futile, unless the opinions are also backed up by real-life use cases. Can you tell why the previous behavior made parse-colon-path difficult to use, and in what situations?
bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Sun, 30 Dec 2012 20:39:01 GMT) Full text and rfc822 format available.Message #26 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Dave Abrahams <dave <at> boostpro.com> To: Eli Zaretskii <eliz <at> gnu.org> Cc: rgm <at> gnu.org, 12351 <at> debbugs.gnu.org Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Sun, 30 Dec 2012 15:37:16 -0500
on Sun Dec 30 2012, Eli Zaretskii <eliz-AT-gnu.org> wrote:
>> From: Dave Abrahams <dave <at> boostpro.com>
>> Date: Sun, 30 Dec 2012 14:53:44 -0500
>> Cc: 12351 <at> debbugs.gnu.org
>>
>> > Obviously we need the nils to remain, so I will put them back and just
>> > mention that empty elements return nil. It's not worth handling the
>> > minor aesthetic annoyance of (nil nil) specially.
>>
>> FWIW, I disagree. IMO you should at least consider fixing eshell and any
>> other things that break because of this change. This discontinuity in
>> behavior is not merely aesthetic; it makes parse-colon-path difficult to
>> use correctly and leads to hard-to-find bugs in any code that fails to
>> account for the possible nils.
>
> This whole discussion is rather futile, unless the opinions are also
> backed up by real-life use cases. Can you tell why the previous
> behavior made parse-colon-path difficult to use, and in what
> situations?
Instead of recording that complex situation when I encountered the bug I
helpfully (!) recorded a reduced reproducible example that stripped away
the use case, which I didn't remember... but I even went the extra mile
to reconstruct it. For example, look at
http://edward.oconnor.cx/elisp/osx-plist.el
The following function is buggy because of the original bug:
--8<---------------cut here---------------start------------->8---
(defun osx-plist-update-exec-path ()
"Update `exec-path' from the PATH environment variable."
(let ((path (getenv "PATH")))
(mapc (lambda (dir)
(add-to-list 'exec-path dir))
(parse-colon-path path)))
exec-path)
--8<---------------cut here---------------end--------------->8---
I had to replace it in my local installation as follows:
--8<---------------cut here---------------start------------->8---
(defun osx-plist-update-exec-path ()
"Update `exec-path' from the PATH environment variable."
(let ((path (delq nil (parse-colon-path (getenv "PATH")))))
(setq exec-path
(dolist (dir exec-path path)
(add-to-list 'path (file-name-as-directory dir) :append)))))
--8<---------------cut here---------------end--------------->8---
If you go looking for instances of parse-colon-path I'm sure you'll find
hundreds of other places where the use was tailored to the documented
behavior of parse-colon-path rather than the specific oddball behavior
that was actually implemented. I found at least one in my own code just
now.
IMO, though, you should actually be able to understand this one without
any examples. Any discontinuity in behavior means the client needs to
write special-case code to handle that special-case behavior. For one
or two clients it may be that the special-case behavior matches just
what they need, but in general that's highly unlikely. Combine this
with the fact that the uniform behavior has been documented for years,
and that the inputs that trigger the non-uniformity are rare, and you
can be pretty confident that more code has been written to the uniform
specification.
--
Dave Abrahams
BoostPro Computing Software Development Training
http://www.boostpro.com Clang/LLVM/EDG Compilers C++ Boost
bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Sun, 30 Dec 2012 22:10:02 GMT) Full text and rfc822 format available.Message #29 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Andreas Schwab <schwab <at> linux-m68k.org> To: Dave Abrahams <dave <at> boostpro.com> Cc: 12351 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org> Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Sun, 30 Dec 2012 23:08:08 +0100
Dave Abrahams <dave <at> boostpro.com> writes: > The following function is buggy because of the original bug: > > (defun osx-plist-update-exec-path () > "Update `exec-path' from the PATH environment variable." > (let ((path (getenv "PATH"))) > (mapc (lambda (dir) > (add-to-list 'exec-path dir)) > (parse-colon-path path))) > exec-path) In which way is this buggy, apart from the fact that it reverses the path (which has nothing to do with the behaviour of parse-colon-path)? 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."
bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Mon, 31 Dec 2012 01:45:02 GMT) Full text and rfc822 format available.Message #32 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Wolfgang Jenkner <wjenkner <at> inode.at> To: Dave Abrahams <dave <at> boostpro.com> Cc: 12351 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org> Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Mon, 31 Dec 2012 02:40:21 +0100
On Sun, Dec 30 2012, Dave Abrahams wrote:
> The following function is buggy because of the original bug:
>
> (defun osx-plist-update-exec-path ()
> "Update `exec-path' from the PATH environment variable."
> (let ((path (getenv "PATH")))
> (mapc (lambda (dir)
> (add-to-list 'exec-path dir))
> (parse-colon-path path)))
> exec-path)
>
> I had to replace it in my local installation as follows:
>
> (defun osx-plist-update-exec-path ()
> "Update `exec-path' from the PATH environment variable."
> (let ((path (delq nil (parse-colon-path (getenv "PATH")))))
> (setq exec-path
> (dolist (dir exec-path path)
> (add-to-list 'path (file-name-as-directory dir) :append)))))
But the first function exhibited a bug only with an empty component in
the path. So I'd guess that nil ought to be replaced by "." instead of
being deleted from the list. If the second function gives the correct
result that means that exec-path already contained "." before the call.
And in any case, wouldn't the trivial patch (relative to trunk) below do
the right thing here?
Confused,
Wolfgang
=== modified file 'lisp/files.el'
--- lisp/files.el 2012-12-17 15:51:49 +0000
+++ lisp/files.el 2012-12-31 01:00:47 +0000
@@ -664,7 +664,7 @@
(when (stringp search-path)
(mapcar (lambda (f)
(substitute-in-file-name (file-name-as-directory f)))
- (split-string search-path path-separator t))))
+ (split-string search-path path-separator))))
(defun cd-absolute (dir)
"Change current directory to given absolute file name DIR."
bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Mon, 31 Dec 2012 03:11:02 GMT) Full text and rfc822 format available.Message #35 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Dave Abrahams <dave <at> boostpro.com> To: Andreas Schwab <schwab <at> linux-m68k.org> Cc: 12351 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org> Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Sun, 30 Dec 2012 22:08:57 -0500
on Sun Dec 30 2012, Andreas Schwab <schwab-AT-linux-m68k.org> wrote: > Dave Abrahams <dave <at> boostpro.com> writes: > >> The following function is buggy because of the original bug: >> >> (defun osx-plist-update-exec-path () >> "Update `exec-path' from the PATH environment variable." >> (let ((path (getenv "PATH"))) >> (mapc (lambda (dir) >> (add-to-list 'exec-path dir)) >> (parse-colon-path path))) >> exec-path) > > In which way is this buggy, apart from the fact that it reverses the > path (which has nothing to do with the behaviour of parse-colon-path)? It puts nils in exec-path when PATH contains empty elements. -- Dave Abrahams BoostPro Computing Software Development Training http://www.boostpro.com Clang/LLVM/EDG Compilers C++ Boost
bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Mon, 31 Dec 2012 03:13:02 GMT) Full text and rfc822 format available.Message #38 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Dave Abrahams <dave <at> boostpro.com> To: Wolfgang Jenkner <wjenkner <at> inode.at> Cc: 12351 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org> Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Sun, 30 Dec 2012 22:11:19 -0500
on Sun Dec 30 2012, Wolfgang Jenkner <wjenkner-AT-inode.at> wrote: > On Sun, Dec 30 2012, Dave Abrahams wrote: > >> The following function is buggy because of the original bug: >> >> (defun osx-plist-update-exec-path () >> "Update `exec-path' from the PATH environment variable." >> (let ((path (getenv "PATH"))) >> (mapc (lambda (dir) >> (add-to-list 'exec-path dir)) >> (parse-colon-path path))) >> exec-path) >> >> I had to replace it in my local installation as follows: >> >> (defun osx-plist-update-exec-path () >> "Update `exec-path' from the PATH environment variable." >> (let ((path (delq nil (parse-colon-path (getenv "PATH"))))) >> (setq exec-path >> (dolist (dir exec-path path) >> (add-to-list 'path (file-name-as-directory dir) :append))))) > > But the first function exhibited a bug only with an empty component in > the path. So I'd guess that nil ought to be replaced by "." instead of > being deleted from the list. No, that would be wrong. Every OS I know of treats empty elements in "colon paths" (semicolon paths on Windows) differently from elements that are "." > If the second function gives the correct result that means that > exec-path already contained "." before the call. > > And in any case, wouldn't the trivial patch (relative to trunk) below do > the right thing here? > > Confused, > > Wolfgang > > === modified file 'lisp/files.el' > --- lisp/files.el 2012-12-17 15:51:49 +0000 > +++ lisp/files.el 2012-12-31 01:00:47 +0000 > @@ -664,7 +664,7 @@ > (when (stringp search-path) > (mapcar (lambda (f) > (substitute-in-file-name (file-name-as-directory f))) > - (split-string search-path path-separator t)))) > + (split-string search-path path-separator)))) > > (defun cd-absolute (dir) > "Change current directory to given absolute file name DIR." It depends whether you think the "right thing" is the old behavior or the documented behavior or something else. -- Dave Abrahams BoostPro Computing Software Development Training http://www.boostpro.com Clang/LLVM/EDG Compilers C++ Boost
bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Mon, 31 Dec 2012 06:58:02 GMT) Full text and rfc822 format available.Message #41 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Glenn Morris <rgm <at> gnu.org> To: Dave Abrahams <dave <at> boostpro.com> Cc: 12351 <at> debbugs.gnu.org, Wolfgang Jenkner <wjenkner <at> inode.at> Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Mon, 31 Dec 2012 01:56:17 -0500
Dave Abrahams wrote: > Every OS I know of treats empty elements in "colon paths" (semicolon > paths on Windows) differently from elements that are "." So why do you want to just unconditionally delete them from the result of parse-colon-path? What should they be represented by, if not nil? load-path, exec-path both are documented to accept nil for default-directory. cd-path works the same way.
bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Mon, 31 Dec 2012 07:09:01 GMT) Full text and rfc822 format available.Message #44 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Glenn Morris <rgm <at> gnu.org> To: Dave Abrahams <dave <at> boostpro.com> Cc: 12351 <at> debbugs.gnu.org, Wolfgang Jenkner <wjenkner <at> inode.at> Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Mon, 31 Dec 2012 02:07:15 -0500
PS parse-colon-path is explicitly documented to return nils:
-- Function: parse-colon-path path
This function takes a search path string such as the value of the
`PATH' environment variable, and splits it at the separators,
returning a list of directory names. `nil' in this list means the
current directory. Although the function's name says "colon", it
actually uses the value of `path-separator'.
(parse-colon-path ":/foo:/bar")
=> (nil "/foo/" "/bar/")
The only use of parse-colon-path in "core" Emacs is in setting cd-path,
which needs the nil, as we have seen.
bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Mon, 31 Dec 2012 07:16:02 GMT) Full text and rfc822 format available.Message #47 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Glenn Morris <rgm <at> gnu.org> To: Dave Abrahams <dave <at> boostpro.com> Cc: 12351 <at> debbugs.gnu.org, Andreas Schwab <schwab <at> linux-m68k.org> Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Mon, 31 Dec 2012 02:14:18 -0500
Dave Abrahams wrote: > It puts nils in exec-path when PATH contains empty elements. man bash: A zero-length (null) directory name in the value of PATH indicates the current directory. C-h v exec-path nil [means] (try default directory). So this all seems totally consistent to me.
bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Mon, 31 Dec 2012 10:10:01 GMT) Full text and rfc822 format available.Message #50 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Andreas Schwab <schwab <at> linux-m68k.org> To: Dave Abrahams <dave <at> boostpro.com> Cc: 12351 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org> Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Mon, 31 Dec 2012 11:07:48 +0100
Dave Abrahams <dave <at> boostpro.com> writes: > It puts nils in exec-path when PATH contains empty elements. Which is exactly what you want. 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."
bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Mon, 31 Dec 2012 13:00:02 GMT) Full text and rfc822 format available.Message #53 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Dave Abrahams <dave <at> boostpro.com> To: Glenn Morris <rgm <at> gnu.org> Cc: 12351 <at> debbugs.gnu.org, Wolfgang Jenkner <wjenkner <at> inode.at> Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Mon, 31 Dec 2012 07:58:27 -0500
on Mon Dec 31 2012, Glenn Morris <rgm-AT-gnu.org> wrote: > PS parse-colon-path is explicitly documented to return nils: > > -- Function: parse-colon-path path > This function takes a search path string such as the value of the > `PATH' environment variable, and splits it at the separators, > returning a list of directory names. `nil' in this list means the > current directory. Although the function's name says "colon", it > actually uses the value of `path-separator'. > > (parse-colon-path ":/foo:/bar") > => (nil "/foo/" "/bar/") > > The only use of parse-colon-path in "core" Emacs is in setting cd-path, > which needs the nil, as we have seen. OK, the docstring doesn't match the manual. -- Dave Abrahams BoostPro Computing Software Development Training http://www.boostpro.com Clang/LLVM/EDG Compilers C++ Boost
bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Mon, 31 Dec 2012 13:01:02 GMT) Full text and rfc822 format available.Message #56 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Dave Abrahams <dave <at> boostpro.com> To: Glenn Morris <rgm <at> gnu.org> Cc: 12351 <at> debbugs.gnu.org, Andreas Schwab <schwab <at> linux-m68k.org> Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Mon, 31 Dec 2012 07:59:11 -0500
on Mon Dec 31 2012, Glenn Morris <rgm-AT-gnu.org> wrote: > Dave Abrahams wrote: > >> It puts nils in exec-path when PATH contains empty elements. > > man bash: > > A zero-length (null) directory name in the value of PATH indicates the > current directory. > > C-h v exec-path > > nil [means] (try default directory). > > So this all seems totally consistent to me. I stand corrected. Please fix the docstring, but otherwise I have no argument to make here. -- Dave Abrahams BoostPro Computing Software Development Training http://www.boostpro.com Clang/LLVM/EDG Compilers C++ Boost
bug-gnu-emacs <at> gnu.org:bug#12351; Package emacs.
(Mon, 31 Dec 2012 16:12:01 GMT) Full text and rfc822 format available.Message #59 received at 12351 <at> debbugs.gnu.org (full text, mbox):
From: Wolfgang Jenkner <wjenkner <at> inode.at> To: Dave Abrahams <dave <at> boostpro.com> Cc: 12351 <at> debbugs.gnu.org Subject: Re: bug#12351: 24.1; parse-colon-path turns empty paths into nil Date: Mon, 31 Dec 2012 17:10:42 +0100
On Mon, Dec 31 2012, Dave Abrahams wrote: > No, that would be wrong. Every OS I know of treats empty elements in > "colon paths" (semicolon paths on Windows) differently from elements > that are "." But not in the PATH environment variable, I'd think in the light of http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html#tag_08_03 Wolfgang
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