bug#69517: [PATCH] Make gnus cache work with group names having '/'

[James Thomas via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

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Tags: patch

Reproduction steps:

- Setup Gnus with any group name having a slash ('/') such as
  "[Gmail]/Drafts" or an Atom feed (they usually have slashes) using the
  patch in bug#66188.

- Press '*' on a message in the group.

- Do (info "(gnus) Creating a Virtual Server")

- Open the above from the Server buffer; RET on the new group fails.

A patch is attached. I couldn't find the problematic commit or its
original branch (where it was a consolidated merge from) but
'gnus-use-long-file-names' is apparently not meant for backends: it
can't even be customized with that 'not-cache' option. I think this is
the right way to solve it: the other lines removed in this patch are
even older, but they were never being called due to the above reason.

In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.33, cairo version 1.16.0) of 2024-02-20 built on
 user-Inspiron-15-5518
Repository revision: 466800591c2bd674b0b967205147d7519da7e1a4
Repository branch: nnatom-master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Ubuntu 22.04.3 LTS


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From e0b4a71bf241d6faaa46bea58a4688f1e9c932b8 Mon Sep 17 00:00:00 2001
From: James Thomas <jimjoe@gmx.net>
Date: Sun, 3 Mar 2024 06:58:49 +0530
Subject: [PATCH] Make gnus cache work with group names having '/'

Replace the incorrect `gnus-use-long-file-name` with
`nnmail-use-long-file-names`.

* lisp/gnus/gnus-cache.el (gnus-cache-file-name):
---
 lisp/gnus/gnus-cache.el | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/lisp/gnus/gnus-cache.el b/lisp/gnus/gnus-cache.el
index 961219eee8f..d174ee9a9f4 100644
--- a/lisp/gnus/gnus-cache.el
+++ b/lisp/gnus/gnus-cache.el
@@ -448,16 +448,12 @@ gnus-cache-file-name
    (file-name-as-directory
     (expand-file-name
      (nnheader-translate-file-chars
-      (if (gnus-use-long-file-name 'not-cache)
-	  group
-	(let ((group (nnheader-replace-duplicate-chars-in-string
-		      (nnheader-replace-chars-in-string group ?/ ?_)
-		      ?. ?_)))
-	  ;; Translate the first colon into a slash.
-	  (when (string-match ":" group)
-		  (setq group (concat (substring group 0 (match-beginning 0))
-				      "/" (substring group (match-end 0)))))
-	  (nnheader-replace-chars-in-string group ?. ?/)))
+      (let ((group (nnheader-replace-duplicate-chars-in-string
+		    (nnheader-replace-chars-in-string group ?/ ?_)
+		    ?. ?_)))
+	(if (not nnmail-use-long-file-names)
+            (nnheader-replace-chars-in-string group ?. ?/)
+	  group))
       t)
      gnus-cache-directory))))

--
2.34.1


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