* bug#12351: 24.1; parse-colon-path turns empty paths into nil
@ 2012-09-04 18:58 Dave Abrahams
2012-09-16 15:57 ` Chong Yidong
2012-12-30 18:52 ` Glenn Morris
0 siblings, 2 replies; 17+ messages in thread
From: Dave Abrahams @ 2012-09-04 18:58 UTC (permalink / raw)
To: 12351
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...
Error during redisplay: (wrong-type-argument arrayp nil) [20 times]
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Features:
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calist alist pym static apel-ver product starttls gnus-harvest message
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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
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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
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-09-04 18:58 bug#12351: 24.1; parse-colon-path turns empty paths into nil Dave Abrahams
@ 2012-09-16 15:57 ` Chong Yidong
2012-12-30 18:52 ` Glenn Morris
1 sibling, 0 replies; 17+ messages in thread
From: Chong Yidong @ 2012-09-16 15:57 UTC (permalink / raw)
To: Dave Abrahams; +Cc: 12351
Dave Abrahams <dave@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.
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-09-04 18:58 bug#12351: 24.1; parse-colon-path turns empty paths into nil Dave Abrahams
2012-09-16 15:57 ` Chong Yidong
@ 2012-12-30 18:52 ` Glenn Morris
2012-12-30 19:53 ` Dave Abrahams
1 sibling, 1 reply; 17+ messages in thread
From: Glenn Morris @ 2012-12-30 18:52 UTC (permalink / raw)
To: Dave Abrahams; +Cc: 12351
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.
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-12-30 18:52 ` Glenn Morris
@ 2012-12-30 19:53 ` Dave Abrahams
2012-12-30 20:22 ` Eli Zaretskii
0 siblings, 1 reply; 17+ messages in thread
From: Dave Abrahams @ 2012-12-30 19:53 UTC (permalink / raw)
To: Glenn Morris; +Cc: 12351
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
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-12-30 19:53 ` Dave Abrahams
@ 2012-12-30 20:22 ` Eli Zaretskii
2012-12-30 20:37 ` Dave Abrahams
0 siblings, 1 reply; 17+ messages in thread
From: Eli Zaretskii @ 2012-12-30 20:22 UTC (permalink / raw)
To: Dave Abrahams; +Cc: 12351
> From: Dave Abrahams <dave@boostpro.com>
> Date: Sun, 30 Dec 2012 14:53:44 -0500
> Cc: 12351@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?
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-12-30 20:22 ` Eli Zaretskii
@ 2012-12-30 20:37 ` Dave Abrahams
2012-12-30 22:08 ` Andreas Schwab
2012-12-31 1:40 ` Wolfgang Jenkner
0 siblings, 2 replies; 17+ messages in thread
From: Dave Abrahams @ 2012-12-30 20:37 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: 12351
on Sun Dec 30 2012, Eli Zaretskii <eliz-AT-gnu.org> wrote:
>> From: Dave Abrahams <dave@boostpro.com>
>> Date: Sun, 30 Dec 2012 14:53:44 -0500
>> Cc: 12351@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
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-12-30 20:37 ` Dave Abrahams
@ 2012-12-30 22:08 ` Andreas Schwab
2012-12-31 3:08 ` Dave Abrahams
2012-12-31 1:40 ` Wolfgang Jenkner
1 sibling, 1 reply; 17+ messages in thread
From: Andreas Schwab @ 2012-12-30 22:08 UTC (permalink / raw)
To: Dave Abrahams; +Cc: 12351
Dave Abrahams <dave@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@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-12-30 20:37 ` Dave Abrahams
2012-12-30 22:08 ` Andreas Schwab
@ 2012-12-31 1:40 ` Wolfgang Jenkner
2012-12-31 3:11 ` Dave Abrahams
1 sibling, 1 reply; 17+ messages in thread
From: Wolfgang Jenkner @ 2012-12-31 1:40 UTC (permalink / raw)
To: Dave Abrahams; +Cc: 12351
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."
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-12-30 22:08 ` Andreas Schwab
@ 2012-12-31 3:08 ` Dave Abrahams
2012-12-31 7:14 ` Glenn Morris
2012-12-31 10:07 ` Andreas Schwab
0 siblings, 2 replies; 17+ messages in thread
From: Dave Abrahams @ 2012-12-31 3:08 UTC (permalink / raw)
To: Andreas Schwab; +Cc: 12351
on Sun Dec 30 2012, Andreas Schwab <schwab-AT-linux-m68k.org> wrote:
> Dave Abrahams <dave@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
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-12-31 1:40 ` Wolfgang Jenkner
@ 2012-12-31 3:11 ` Dave Abrahams
2012-12-31 6:56 ` Glenn Morris
2012-12-31 16:10 ` Wolfgang Jenkner
0 siblings, 2 replies; 17+ messages in thread
From: Dave Abrahams @ 2012-12-31 3:11 UTC (permalink / raw)
To: Wolfgang Jenkner; +Cc: 12351
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
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-12-31 3:11 ` Dave Abrahams
@ 2012-12-31 6:56 ` Glenn Morris
2012-12-31 7:07 ` Glenn Morris
2012-12-31 16:10 ` Wolfgang Jenkner
1 sibling, 1 reply; 17+ messages in thread
From: Glenn Morris @ 2012-12-31 6:56 UTC (permalink / raw)
To: Dave Abrahams; +Cc: 12351, Wolfgang Jenkner
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.
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-12-31 6:56 ` Glenn Morris
@ 2012-12-31 7:07 ` Glenn Morris
2012-12-31 12:58 ` Dave Abrahams
0 siblings, 1 reply; 17+ messages in thread
From: Glenn Morris @ 2012-12-31 7:07 UTC (permalink / raw)
To: Dave Abrahams; +Cc: 12351, Wolfgang Jenkner
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.
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-12-31 3:08 ` Dave Abrahams
@ 2012-12-31 7:14 ` Glenn Morris
2012-12-31 12:59 ` Dave Abrahams
2012-12-31 10:07 ` Andreas Schwab
1 sibling, 1 reply; 17+ messages in thread
From: Glenn Morris @ 2012-12-31 7:14 UTC (permalink / raw)
To: Dave Abrahams; +Cc: 12351, Andreas Schwab
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.
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-12-31 3:08 ` Dave Abrahams
2012-12-31 7:14 ` Glenn Morris
@ 2012-12-31 10:07 ` Andreas Schwab
1 sibling, 0 replies; 17+ messages in thread
From: Andreas Schwab @ 2012-12-31 10:07 UTC (permalink / raw)
To: Dave Abrahams; +Cc: 12351
Dave Abrahams <dave@boostpro.com> writes:
> It puts nils in exec-path when PATH contains empty elements.
Which is exactly what you want.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-12-31 7:07 ` Glenn Morris
@ 2012-12-31 12:58 ` Dave Abrahams
0 siblings, 0 replies; 17+ messages in thread
From: Dave Abrahams @ 2012-12-31 12:58 UTC (permalink / raw)
To: Glenn Morris; +Cc: 12351, Wolfgang Jenkner
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
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-12-31 7:14 ` Glenn Morris
@ 2012-12-31 12:59 ` Dave Abrahams
0 siblings, 0 replies; 17+ messages in thread
From: Dave Abrahams @ 2012-12-31 12:59 UTC (permalink / raw)
To: Glenn Morris; +Cc: 12351, Andreas Schwab
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
^ permalink raw reply [flat|nested] 17+ messages in thread
* bug#12351: 24.1; parse-colon-path turns empty paths into nil
2012-12-31 3:11 ` Dave Abrahams
2012-12-31 6:56 ` Glenn Morris
@ 2012-12-31 16:10 ` Wolfgang Jenkner
1 sibling, 0 replies; 17+ messages in thread
From: Wolfgang Jenkner @ 2012-12-31 16:10 UTC (permalink / raw)
To: Dave Abrahams; +Cc: 12351
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
^ permalink raw reply [flat|nested] 17+ messages in thread
end of thread, other threads:[~2012-12-31 16:10 UTC | newest]
Thread overview: 17+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-09-04 18:58 bug#12351: 24.1; parse-colon-path turns empty paths into nil Dave Abrahams
2012-09-16 15:57 ` Chong Yidong
2012-12-30 18:52 ` Glenn Morris
2012-12-30 19:53 ` Dave Abrahams
2012-12-30 20:22 ` Eli Zaretskii
2012-12-30 20:37 ` Dave Abrahams
2012-12-30 22:08 ` Andreas Schwab
2012-12-31 3:08 ` Dave Abrahams
2012-12-31 7:14 ` Glenn Morris
2012-12-31 12:59 ` Dave Abrahams
2012-12-31 10:07 ` Andreas Schwab
2012-12-31 1:40 ` Wolfgang Jenkner
2012-12-31 3:11 ` Dave Abrahams
2012-12-31 6:56 ` Glenn Morris
2012-12-31 7:07 ` Glenn Morris
2012-12-31 12:58 ` Dave Abrahams
2012-12-31 16:10 ` Wolfgang Jenkner
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