From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Nicolas Richard Newsgroups: gmane.emacs.bugs Subject: bug#27982: 25.1.50; expand-file-name docstring on how to traverse the filesystem Date: Wed, 23 Aug 2017 21:18:53 +0200 Message-ID: <86wp5um6ss.fsf@members.fsf.org> References: <87tw1lkjt8.fsf@members.fsf.org> <83r2wotz6i.fsf@gnu.org> <86bmn6o4tr.fsf@members.fsf.org> <83378i9nrv.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1503516016 5624 195.159.176.226 (23 Aug 2017 19:20:16 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 23 Aug 2017 19:20:16 +0000 (UTC) User-Agent: mu4e 0.9.19; emacs 25.2.1 Cc: 27982@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Aug 23 21:20:10 2017 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dkbC9-0000sr-Nt for geb-bug-gnu-emacs@m.gmane.org; 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23 Aug 2017 21:18:54 +0200 In-reply-to: <83378i9nrv.fsf@gnu.org> X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:136119 Archived-At: Eli Zaretskii writes: > Crystal ball says that current-directory (which you probably meant to > be default-directory instead) ends in a slash, in which case remove > it, and the 2 results will match. Your crystal ball is working fine. Sorry for leaving that detail out. FWIW I have (defvaralias 'current-directory 'default-directory) because I used to forget the name of the variable (and I still do, it seems). Note however that default-directory ends in a slash when using "emacs -Q" too. Ok so now I'm saying that, with the suggestion in the docstring, output will be different if "dirname" ends in a slash. IOW if it is a "directory name" as opposed to "directory's file name". (let ((dirname "/home/youngfrog/")) (format "%s versus %s" (directory-file-name (file-name-directory dirname)) (expand-file-name ".." dirname))) => output is different (let ((dirname "/home/youngfrog")) (format "%s versus %s" (directory-file-name (file-name-directory dirname)) (expand-file-name ".." dirname))) => output the same With the function calls swapped the output is always similar: (let ((dirname "/home/youngfrog/")) (format "%s versus %s" (file-name-directory (directory-file-name dirname)) (expand-file-name ".." dirname))) => output is similar (let ((dirname "/home/youngfrog")) (format "%s versus %s" (file-name-directory (directory-file-name dirname)) (expand-file-name ".." dirname))) => output is similar Nicolas.