piem-inboxes: Allow :url values without a trailing slash

The piem-inboxes documentation says that the :url value must end in a
slash, which is confusing because 1) public-inbox does not require
this and has examples in its docs without a slash and 2) some spots in
piem already append a slash if needed.

Add a piem-inbox-get wrapper that ensures the returned URL ends with a
slash, and use it in all spots that retrieve an inbox's URL.

Reported-by: Jelle Licht <jlicht@fsfe.org>
Link: https://inbox.kyleam.com/piem/87y1l9ualg.fsf@fsfe.org
Message-ID: <20230603041100.200632-1-kyle@kyleam.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/piem-b4.el b/piem-b4.el
index cd19ebb..8a381c6 100644
--- a/piem-b4.el
+++ b/piem-b4.el
@@ -73,7 +73,7 @@ This is intended to be used for debugging purposes.")
     ;; b4's configuration.
     (unless local-mbox-p
       (when-let ((url (and (equal mid (piem-mid))
-                           (piem-inbox-get :url))))
+                           (piem-inbox-url))))
         (ignore-errors
           (piem-with-url-contents
               (concat url (piem-escape-mid mid) "/t.mbox.gz")