From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Daniel Colascione <dancol@dancol.org>
Cc: Emacs development discussions <emacs-devel@gnu.org>
Subject: Re: substitute-in-file-name is not distributive
Date: Tue, 30 Oct 2012 23:41:30 -0400 [thread overview]
Message-ID: <jwv390viad1.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <509047F6.2010805@dancol.org> (Daniel Colascione's message of "Tue, 30 Oct 2012 14:34:46 -0700")
>> What do you append it to? If the mapping is arbitrary, you first need
>> to convert the Cywin name to Windows, the concat, then convert
>> back, right?
> Sure. In practice, concatenating short relative paths works pretty
> well, and I'd like to translate /foo/bar/qux\bar/spam.txt to
> /foo/bar/qux/bar/spam.txt. That work can be done inside the
> s-i-f-n handler.
So for relative names you'd just convert \ to / ?
>>>> So Cygin itself treats "\\bin" and "/bin" as equivalent
>>> No --- Cygwin treats "\\bin" just as Windows would: it's
>>> a drive-letter-relative Windows path. "/bin" is a perfectly normal
>>> POSIX path.
>>
>> Now I'm lost. So you're saying that Cygwin accepts backslash delimited
>> file names and assumes they're Window file names? IOW Cygwin already
>> accepts just as happily Windows file names? In this case, I'm wondering
>> why you need s-i-f-n.
> Cygwin handles them, but Emacs doesn't.
Currently, that's true, and while under w32 we just treat \ and / as
equivalent, it sounds like this is not an option for Cygwin, right?
I mean that Emacs-w32 is happy to treat \ as a separator but it will not
itself add a \, so it often silently turns \ into /. We could do the
same under Cygwin, but from you say it sounds like it might not do the
right thing.
Of course, that depends on details: is /usr\bin treated by Cygwin as
identical to /usr/bin? What about \bin compared to /bin?
>> Is it because Cygwin needs backslashes to recognize Windows file names
>> whereas Emacs wants to turn all backslashes into slashes?
> I see Emacs treating backslashes as just another filename constituent.
Right, because the Cygwin build uses the "Unix" code which presumes
POSIX-like semantics.
> You're right: the problem isn't GUI-specific. I just came across the
> problem while doing general improvements to Cygwin Emacs. Maybe I'm
> the first one to be really bothered by the problem. I do a lot of
> mixed Cygwin and Windows development work.
OK, makes sense.
>>>> If you limit yourself to:
>>>> - rewrite "\\`[a-zA-Z]:" to "/cygdrive/c" (regardless if it is followed
>>> Not all Cygwin installations use "cygdrive".
>> I kind of know.
> Sorry for being repetitive.
That's not what I meant: I meant that I have a vague knowledge that this
is the case, but I don't know what it really entails (e.g. can this
name be changed, or can it even not exist at all?).
Stefan
prev parent reply other threads:[~2012-10-31 3:41 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-10 5:36 substitute-in-file-name is not distributive Daniel Colascione
2012-10-10 6:39 ` Andreas Schwab
2012-10-10 15:31 ` Eli Zaretskii
2012-10-10 16:48 ` Daniel Colascione
2012-10-10 17:18 ` Eli Zaretskii
2012-10-10 17:40 ` Daniel Colascione
2012-10-11 3:25 ` Stephen Leake
2012-10-25 3:20 ` Stefan Monnier
2012-10-25 3:28 ` Daniel Colascione
2012-10-27 16:08 ` Stefan Monnier
2012-10-28 19:09 ` Stefan Monnier
2012-10-30 4:10 ` Daniel Colascione
2012-10-30 13:15 ` Stefan Monnier
2012-10-30 15:01 ` Daniel Colascione
2012-10-30 18:58 ` Stefan Monnier
2012-10-30 20:12 ` Daniel Colascione
2012-10-30 21:24 ` Stefan Monnier
2012-10-30 21:34 ` Daniel Colascione
2012-10-31 3:41 ` Stefan Monnier [this message]
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