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Re: bug in copy-directory
From: |
Stefan Monnier |
Subject: |
Re: bug in copy-directory |
Date: |
Fri, 28 Jan 2011 13:35:46 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) |
>>>> Actually on 23.2.92.1, copy-directory, called interactively or not copy
>>>> the files of directory A to existing directory B instead of copying
>>>> directory A inside directory B.(as a subdirectory of B).
>>> Hmm, this is a bit problematic.
>> [...]
>>> The trouble is that Lisp callers might depend on the old behavior.
>> Couldn't/shouldn't we distinguish between interactive and
>> non-interactive calls, then? I.e. have the interactive spec turn the
>> B into (expand-file-name (file-name-nondirectory A)) when B is an
>> existing directory.
> Wouldn't that be confusing? "Copy directory A to directory B" really
> ought to mean the same as "cp -r a b".
It depends if you expect it to behave like `cp' even for
non-interactive uses.
I don't think there's a traditional C-level equivalent to `cp', but at
least for `mv', the C-level API (aka `rename') does not behave like
`mv', but instead signals an error if the destination is
a pre-existing directory.
As Lennart points out, the semantics of `rename' are a bit less magical,
which tends to work well when you care about race-conditions and other
fun stuff. OTOH out `copy-file' behaves like `cp', so I guess it's OK
for copy-directory to also always behave like `cp' even for
non-interactive uses.
Stefan
- Re: bug in copy-directory, (continued)
- Re: bug in copy-directory, Thierry Volpiatto, 2011/01/28
- Re: bug in copy-directory, Lennart Borgman, 2011/01/28
- Re: bug in copy-directory, Thierry Volpiatto, 2011/01/28
- Re: bug in copy-directory, Lennart Borgman, 2011/01/28
- Re: bug in copy-directory, Jan Djärv, 2011/01/28
- Re: bug in copy-directory, Lennart Borgman, 2011/01/28
- Re: bug in copy-directory, Jan Djärv, 2011/01/28
- Re: bug in copy-directory, Lennart Borgman, 2011/01/28
- Re: bug in copy-directory, Eli Zaretskii, 2011/01/28
- Re: bug in copy-directory, Thierry Volpiatto, 2011/01/28
- Re: bug in copy-directory,
Stefan Monnier <=
- Re: bug in copy-directory, Chong Yidong, 2011/01/29
- Re: bug in copy-directory, Thierry Volpiatto, 2011/01/29
- Re: bug in copy-directory, Michael Albinus, 2011/01/30
- Re: bug in copy-directory, Thierry Volpiatto, 2011/01/30
- Re: bug in copy-directory, Michael Albinus, 2011/01/30
- Re: bug in copy-directory, Michael Albinus, 2011/01/30
- Re: bug in copy-directory, Thierry Volpiatto, 2011/01/30
- Re: bug in copy-directory, Michael Albinus, 2011/01/30
- Re: bug in copy-directory, Thierry Volpiatto, 2011/01/30
- Re: bug in copy-directory, Thierry Volpiatto, 2011/01/30