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Re: copy-tree symbol definition

From: Kai Grossjohann
Subject: Re: copy-tree symbol definition
Date: Tue, 08 Jun 2004 07:30:27 +0200
User-agent: Gnus/5.110003 (No Gnus v0.3) Emacs/21.3.50 (gnu/linux)

Michael Albinus <address@hidden> writes:

> Maybe somebody has a proposal? It must be a real copy, not sharing the
> objects of the list.

What you are doing currently is to copy the structure, then to modify
the copy.  But what you could do is to cons up a new structure with
the modifications as necessary:

(let ((backup-directory-alist
       (mapcar (lambda (x) backup-directory-alist)))

But I guess you did it the other way because you don't know whether
you should modify one variable or the other.  Hm.  But there must be
a way!  Hm.

Ah: You could write a function trampify-backup-info which, given an
alist, returns a new alist with different directory names.  Then you
just invoke that function twice:

(let ((backup-directory-alist
       (when (boundp 'backup-directory-alist)
         (trampify-backup-info ...)))
       (when (boundp 'bkup-backup-directory-info)
         (trampify-backup-info ...))))

I wonder if this works.


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