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bug#18310: 24.3.93; relative links don't work in eww and Windows 7

From: João Távora
Subject: bug#18310: 24.3.93; relative links don't work in eww and Windows 7
Date: Thu, 21 Aug 2014 16:43:48 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.93 (windows-nt)

Eli Zaretskii <address@hidden> writes:

> I'm pretty sure it did happen on XP.

I wasn't aware of the bug until the switch to Windows 7. Maybe I
didn't use eww with relative links at all, or maybe other factors
influencing `expand-file-name' weren't acting.

> I don't think it's because of HOME, since there was no "~" in the file
> name.  I'm guessing that the default-directory of the buffer where you
> used that code was on the z: drive, so Emacs used that to complete the
> missing drive letter.

Something other than `default-directory' seems to be influencing it. I
did some tests:

   (let ((default-directory "/"))
     (expand-file-name "../" "/something/bla"))

   (let ((default-directory "\\"))
     (expand-file-name "../" "/something/bla"))
   (let ((default-directory nil))
     (expand-file-name "../" "/something/bla"))

   (let ((default-directory ""))
     (expand-file-name "../" "/something/bla"))

All produce "z:/something". However

   (let ((default-directory "c:"))
     (expand-file-name "../" "/something/bla"))

   (let ((default-directory "\\\\mymachine"))
     (expand-file-name "../" "/something/bla"))

Do produce "c:/something/" and "//mymachine/something/",
respectively. Finally

   (let ((default-directory "\\\\"))
     (expand-file-name "../" "/something/bla"))

Crashed the Emacs process on my machine. Can you reproduce? I don't have
debuggers handy on Windows, so can't even get a backtrace.

> There's nothing wrong with expand-file-name, please don't waste your
> time looking there.

Well, there's the fact that it crashed... but anyway I didn't say there
was.  I just didn't understand what it did. Now that you have explained,
I do, more than before at least.

But from its docstring it's not clear. I didn't understand that
"canonicalize" means different for different platforms. Maybe because
Emacs use of "/" on Windows is an exception I'm used to.

The docstring should explain its relationship with the
`default-directory' variable, which in the current version sounds like
it's shadowed completely by the DEFAULT-DIRECTORY parameter. Perhaps a
sentence could be added.

   If DEFAULT-DIRECTORY is nil or missing, the current buffer's value of
   `default-directory' is used. Even if DEFAULT-DIRECTORY is non-nil,
   `default-directory' may still be used to help canonicalize the
   resulting name for the current platform.

If it's being influenced by anything else, it should also explain it.

> Please use url-expand-file-name instead, it does exactly what you
> want, and does that portably.

That sounds perfectly right, but I don't have time to setup my Emacs
development environment, sorry, so maybe someone else can perform the
change. I think it's a bug to fix for 24.4.


PS: Had a look at `url-expand-file-name': isn't it doing to much for
`shr-expand-url''s purposes?  There seems to be an overlap between the
two. Anyway for 24.4 any fix will do I guess.

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