[PATCH] org-attach-attach: fix symlinks

[Matt Price <moptop99@gmail.com>]

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I'm having trouble with org-attach-attach if my current buffer is visiting
a filepath starting with "~/". This trivial patch fixes the problem for me
by running (expand-file-name) on the file before attaching. I always use
the 'lns method, so I don't know whether it might be better to
expand-file-name before running any of the methods.

Alternatively, it might actually be better to use a *relative* file path
where possible (e.g. to ensure that project directories are fully
portable), but I'm  not sure how best to do that.

This should be a tinychange, but also I have signed FSF paperwork.

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From f618fb512e62ccb2e700242a7678dacbc2b025e2 Mon Sep 17 00:00:00 2001
From: Matt Price <matt.price@utoronto.ca>
Date: Mon, 15 Nov 2021 08:14:37 -0500
Subject: [PATCH] org-attach-attach: expand file names before linking

when using symbolic links for attachments, ensure links are fully
expanded to avoid filesystem errors.
---
 lisp/org-attach.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/org-attach.el b/lisp/org-attach.el
index 75db69c9c..abdce3e7a 100644
--- a/lisp/org-attach.el
+++ b/lisp/org-attach.el
@@ -523,7 +523,7 @@ METHOD may be `cp', `mv', `ln', `lns' or `url' default taken from
        ((eq method 'mv) (rename-file file attach-file))
        ((eq method 'cp) (copy-file file attach-file))
        ((eq method 'ln) (add-name-to-file file attach-file))
-       ((eq method 'lns) (make-symbolic-link file attach-file))
+       ((eq method 'lns) (make-symbolic-link (expand-file-name file) attach-file))
        ((eq method 'url) (url-copy-file file attach-file)))
       (run-hook-with-args 'org-attach-after-change-hook attach-dir)
       (org-attach-tag)
-- 
2.33.1