* bug#13013: 24.3.50; Windows XP bug? get-file-buffer, file-name-as-directory
@ 2012-11-27 17:24 Jambunathan K
2012-11-27 18:01 ` Eli Zaretskii
0 siblings, 1 reply; 6+ messages in thread
From: Jambunathan K @ 2012-11-27 17:24 UTC (permalink / raw)
To: 13013; +Cc: Ista Zahn
This report is a digest of following thread:
http://www.mail-archive.com/emacs-orgmode@gnu.org/msg62455.html.
The problem is because of Emacs mangling file paths like this on Windows
XP.
"c:/DOCUME~1/IZAHN/LOCALS~1/Temp/odt-8052VuJ/"
"c:/Documents and Settings/IZAHN/Local Settings/Temp/odt-8052VuJ/content.xml"
The problem is better explained with ielm session below.
Create a ielm buffer with
M-x ielm RET
and type out the following 4 lisp forms ONE-by-ONE.
(setq org-e-odt-zip-dir (file-name-as-directory (make-temp-file "odt-" t)))
(with-current-buffer (find-file-noselect (concat org-e-odt-zip-dir "content.xml") t) (buffer-file-name))
(with-current-buffer (get-file-buffer (concat org-e-odt-zip-dir "content.xml")) (save-buffer 0))
(get-file-buffer (concat org-e-odt-zip-dir "content.xml"))
Here is what Ista reports:
*** Welcome to IELM *** Type (describe-mode) for help.
ELISP> (setq org-e-odt-zip-dir (file-name-as-directory (make-temp-file
"odt-" t)))
"c:/DOCUME~1/IZAHN/LOCALS~1/Temp/odt-8052VuJ/"
ELISP> (with-current-buffer (find-file-noselect (concat
org-e-odt-zip-dir "content.xml") t) (buffer-file-name))
"c:/Documents and Settings/IZAHN/Local Settings/Temp/odt-8052VuJ/content.xml"
ELISP> (with-current-buffer (get-file-buffer (concat org-e-odt-zip-dir
"content.xml")) (save-buffer 0))
*** Eval error *** Wrong type argument: stringp, nil
ELISP> (get-file-buffer (concat org-e-odt-zip-dir "content.xml"))
nil
ELISP>
I am surprised that `get-file-buffer' is returning nil. Why is there a
mismatch between file names as reported by `file-name-as-directory' and
`buffer-file-name'.
The problem is seen with Ista's machine (CCed here) with the following
setup.
,----
| GNU Emacs 24.2.1 (i386-mingw-nt5.1.2600) of 2012-08-28 on MARVIN
|
| I have cygwin installed, but emacs is the windows version from
| http://ftp.gnu.org/gnu/emacs/windows/
|
| The OS is Windows XP professional with service pack 3.
`----
Apparently the problem is not seen with either here or
,----
| Windows 7
| GNU Emacs 24.2.1 (i386-mingw-nt6.1.7601) of 2012-08-29 on MARVIN
`----
here
,----
| GNU Emacs 24.2.1 (i386-mingw-nt6.1.7601) of 2012-08-29 on MARVIN
| Windows 7
`----
^ permalink raw reply [flat|nested] 6+ messages in thread* bug#13013: 24.3.50; Windows XP bug? get-file-buffer, file-name-as-directory
2012-11-27 17:24 bug#13013: 24.3.50; Windows XP bug? get-file-buffer, file-name-as-directory Jambunathan K
@ 2012-11-27 18:01 ` Eli Zaretskii
2012-11-27 18:38 ` Stefan Monnier
2012-11-27 18:59 ` Eli Zaretskii
0 siblings, 2 replies; 6+ messages in thread
From: Eli Zaretskii @ 2012-11-27 18:01 UTC (permalink / raw)
To: Jambunathan K; +Cc: istazahn, 13013
> From: Jambunathan K <kjambunathan@gmail.com>
> Date: Tue, 27 Nov 2012 22:54:57 +0530
> Cc: Ista Zahn <istazahn@gmail.com>
>
>
> This report is a digest of following thread:
> http://www.mail-archive.com/emacs-orgmode@gnu.org/msg62455.html.
I will read it soon, for now replying only based on what you posted.
> The problem is because of Emacs mangling file paths like this on Windows
> XP.
>
> "c:/DOCUME~1/IZAHN/LOCALS~1/Temp/odt-8052VuJ/"
> "c:/Documents and Settings/IZAHN/Local Settings/Temp/odt-8052VuJ/content.xml"
Emacs doesn't mangle file names. Emacs uses the value of TEMP
environment variable, which Windows sets to a 8+3 alias of the long
name (evidently trying to avoid bugs in programs that don't handle
whitespace in file names). Emacs then converts the 8+3 alias to the
full long name when it stores the file name in the buffer object of
the buffer that visits the file.
> Create a ielm buffer with
> M-x ielm RET
>
> and type out the following 4 lisp forms ONE-by-ONE.
>
> (setq org-e-odt-zip-dir (file-name-as-directory (make-temp-file "odt-" t)))
>
> (with-current-buffer (find-file-noselect (concat org-e-odt-zip-dir "content.xml") t) (buffer-file-name))
>
> (with-current-buffer (get-file-buffer (concat org-e-odt-zip-dir "content.xml")) (save-buffer 0))
>
> (get-file-buffer (concat org-e-odt-zip-dir "content.xml"))
The solution is to call file-truename on
(concat org-e-odt-zip-dir "content.xml")
Think of the 8+3 name as a symlink to the long file name.
> I am surprised that `get-file-buffer' is returning nil.
It returns nil because it compares file names with string-equal.
> Why is there a mismatch between file names as reported by
> `file-name-as-directory' and `buffer-file-name'.
See above. Won't the same happen with symlinks?
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#13013: 24.3.50; Windows XP bug? get-file-buffer, file-name-as-directory
2012-11-27 18:01 ` Eli Zaretskii
@ 2012-11-27 18:38 ` Stefan Monnier
2012-11-27 18:59 ` Eli Zaretskii
1 sibling, 0 replies; 6+ messages in thread
From: Stefan Monnier @ 2012-11-27 18:38 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: istazahn, Jambunathan K, 13013
>> I am surprised that `get-file-buffer' is returning nil.
> It returns nil because it compares file names with string-equal.
I think this brings us back to a recent suggestion to get rid of
get-file-buffer and redefine it as an alias of find-buffer-visiting
(which should work fine in this case).
Stefan
^ permalink raw reply [flat|nested] 6+ messages in thread* bug#13013: 24.3.50; Windows XP bug? get-file-buffer, file-name-as-directory
2012-11-27 18:01 ` Eli Zaretskii
2012-11-27 18:38 ` Stefan Monnier
@ 2012-11-27 18:59 ` Eli Zaretskii
2012-11-27 19:23 ` Achim Gratz
1 sibling, 1 reply; 6+ messages in thread
From: Eli Zaretskii @ 2012-11-27 18:59 UTC (permalink / raw)
To: kjambunathan, istazahn; +Cc: 13013
> Date: Tue, 27 Nov 2012 20:01:19 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: istazahn@gmail.com, 13013@debbugs.gnu.org
>
> > From: Jambunathan K <kjambunathan@gmail.com>
> > Date: Tue, 27 Nov 2012 22:54:57 +0530
> > Cc: Ista Zahn <istazahn@gmail.com>
> >
> >
> > This report is a digest of following thread:
> > http://www.mail-archive.com/emacs-orgmode@gnu.org/msg62455.html.
>
> I will read it soon, for now replying only based on what you posted.
Read it, but didn't learn anything useful.
> The problem is seen with Ista's machine (CCed here) with the following
> setup.
> ,----
> | GNU Emacs 24.2.1 (i386-mingw-nt5.1.2600) of 2012-08-28 on MARVIN
> |
> | I have cygwin installed, but emacs is the windows version from
> | http://ftp.gnu.org/gnu/emacs/windows/
> |
> | The OS is Windows XP professional with service pack 3.
> `----
>
> Apparently the problem is not seen with either here or
> ,----
> | Windows 7
> | GNU Emacs 24.2.1 (i386-mingw-nt6.1.7601) of 2012-08-29 on MARVIN
> `----
>
> here
> ,----
> | GNU Emacs 24.2.1 (i386-mingw-nt6.1.7601) of 2012-08-29 on MARVIN
> | Windows 7
> `----
Because Windows 7 doesn't put a 8+3 alias into TEMP, but instead uses
the full long file name. Probably because XP still supports DOS
programs (via NTVDM), while Windows 7 tossed that support.
IOW, it works on Windows 7 "by sheer luck".
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#13013: 24.3.50; Windows XP bug? get-file-buffer, file-name-as-directory
2012-11-27 18:59 ` Eli Zaretskii
@ 2012-11-27 19:23 ` Achim Gratz
2012-11-27 19:52 ` Eli Zaretskii
0 siblings, 1 reply; 6+ messages in thread
From: Achim Gratz @ 2012-11-27 19:23 UTC (permalink / raw)
To: 13013
Eli Zaretskii writes:
> Because Windows 7 doesn't put a 8+3 alias into TEMP, but instead uses
> the full long file name. Probably because XP still supports DOS
> programs (via NTVDM), while Windows 7 tossed that support.
Win7 may not support DOS programs, but it still supports 8+3 filenames,
this is one of the easier ways to escape quoting hell on that platform.
Regards,
Achim.
--
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+
SD adaptation for Waldorf rackAttack V1.04R1:
http://Synth.Stromeko.net/Downloads.html#WaldorfSDada
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#13013: 24.3.50; Windows XP bug? get-file-buffer, file-name-as-directory
2012-11-27 19:23 ` Achim Gratz
@ 2012-11-27 19:52 ` Eli Zaretskii
0 siblings, 0 replies; 6+ messages in thread
From: Eli Zaretskii @ 2012-11-27 19:52 UTC (permalink / raw)
To: Achim Gratz; +Cc: 13013
> From: Achim Gratz <Stromeko@nexgo.de>
> Date: Tue, 27 Nov 2012 20:23:08 +0100
>
> Eli Zaretskii writes:
> > Because Windows 7 doesn't put a 8+3 alias into TEMP, but instead uses
> > the full long file name. Probably because XP still supports DOS
> > programs (via NTVDM), while Windows 7 tossed that support.
>
> Win7 may not support DOS programs, but it still supports 8+3 filenames,
Of course it does. I never said it didn't. I attempted to explain
why XP sets TEMP to something like C:\DOCUME~1\USERNAME\LOCALS~1\Temp,
whereas Windows 7 sets it to C:\Users\USERNAME\APPDATA\Local\Temp.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-11-27 19:52 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2012-11-27 17:24 bug#13013: 24.3.50; Windows XP bug? get-file-buffer, file-name-as-directory Jambunathan K
2012-11-27 18:01 ` Eli Zaretskii
2012-11-27 18:38 ` Stefan Monnier
2012-11-27 18:59 ` Eli Zaretskii
2012-11-27 19:23 ` Achim Gratz
2012-11-27 19:52 ` Eli Zaretskii
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