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Re: emacsclient: support `/' directory separator on w32

From: Lennart Borgman
Subject: Re: emacsclient: support `/' directory separator on w32
Date: Wed, 29 Nov 2006 17:08:34 +0100
User-agent: Thunderbird (Windows/20061025)

David Kastrup wrote:
Lennart Borgman <address@hidden> writes:

Eli Zaretskii wrote:
Date: Wed, 29 Nov 2006 01:51:51 +0100
From: Lennart Borgman <address@hidden>
Cc: address@hidden

I am not quite sure, but I believe I have seen that the
recommendation from MS for a file argument is to use
But Emacs does not do it, see expand-file-name.  So your proposed
changes make emacsclient behave differently than Emacs.

What is the reason that Emacs does not do it?

Emacs stores its idea of "relativeness" in `default-directory', a
buffer-local variable.

It is not clear how one would attempt to model drive-relativeness on
different drives than the one the buffer is in.  It is possible to
make `default-directory' point to a different drive from that of
`buffer-file-name'.  Maintaining the old drive-relative position at
the same time does not seem possible to do in a reasonably predictable

I also thought so at first. At a second thought it seems simple. Just set emacs working directory (on w32) at the same time as setting default-directory. Then GetFullPathName will always return a result that is consistent with default-directory.

However the glory details of coding this in emacs is not something I precisely know immediately how to do ;-)

And setting the working directory makes me a bit scared too. But is the working directory ever used in emacs? (I found one call to get_current_directory_name in smc_save_yourself.)

Some more trouble: You can ask emacs to edit a file with a name like d:/somepath/c:hello.txt. The characters


are not allowed in the last part of a file or directory name on w32. (Actually using a file name with ":" in the name is possible, but it does not do what an innocent user expect. It creates a file with a hidden what-did-they-call-it? part.)

Unfortunately GetLongPathName() does not care about these characters. I therefore tried with GetLongPathName(), but I could not link with MingGW:

     undefined reference to `GetLongPathName'

Maybe there is a better API for checking file names?

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