bug#64543: [PATCH] package-report-bug: don't fail on custom groups defined by eval

[sbaugh@catern.com]

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Philip Kaludercic <philipk@posteo.net> writes:

> sbaugh@catern.com writes:
>
> Thanks,
>
>> From: Spencer Baugh <sbaugh@catern.com>
>> Date: Sun, 9 Jul 2023 12:59:50 -0400
>> Subject: [PATCH] package-report-bug: don't fail on custom groups defined by
>>  eval
>>
>> Previously we just assumed that the car of an element of
>> custom-current-group-alist was a filename.  But actually it can be nil
>> if a custom group was defined by just evaling Lisp.
>
> Where is this behaviour documented?  I couldn't reproduce it with a
> simple experiment.

To reproduce:
M-: (defgroup mygroup nil "my group") RET

I don't think it's documented anywhere?  custom-current-group-alist is
not documented so this wouldn't be either.

>> * lisp/emacs-lisp/package.el (package-report-bug): Don't fail when a
>> custom group was defined by eval.
>> ---
>>  lisp/emacs-lisp/package.el | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/lisp/emacs-lisp/package.el b/lisp/emacs-lisp/package.el
>> index 3e6acd9b388..f67e99e04b5 100644
>> --- a/lisp/emacs-lisp/package.el
>> +++ b/lisp/emacs-lisp/package.el
>> @@ -4642,6 +4642,7 @@ package-report-bug
>>                     (boundp (car ent))
>>                     (not (eq (custom--standard-value (car ent))
>>                              (default-toplevel-value (car ent))))
>> +                   (car group)
>
> If you are checking for (car group), when do this in the loop instead
> of wrapping the entire `dolist'?

Good point.  I was just copying the last condition in the and.  Lifted
them both out of the loop:


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From 2873d4c482acfd1ced749d593fd512c408e0a578 Mon Sep 17 00:00:00 2001
From: Spencer Baugh <sbaugh@catern.com>
Date: Sun, 9 Jul 2023 22:21:03 -0400
Subject: [PATCH] Support transforming the dirname used by uniquify

By transforming the dirname, we can add additional information to use
during uniquifying.  A basic one: uniquifying buffer names based on
the project name.

* lisp/progmodes/project.el (project-uniquify-dirname-transform): Add.
* lisp/uniquify.el (uniquify-dirname-transform-default)
(uniquify-dirname-transform): Add. (bug#62621)
(uniquify-rationalize-file-buffer-names, uniquify-buffer-file-name):
Use uniquify-dirname-transform.
* test/lisp/uniquify-tests.el (uniquify-home,
uniquify-project-transform): Add tests.
---
 lisp/progmodes/project.el   | 12 ++++++++++++
 lisp/uniquify.el            | 26 +++++++++++++++++++++-----
 test/lisp/uniquify-tests.el | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 66 insertions(+), 5 deletions(-)

diff --git a/lisp/progmodes/project.el b/lisp/progmodes/project.el
index d482cc24d70..78f9fb410c1 100644
--- a/lisp/progmodes/project.el
+++ b/lisp/progmodes/project.el
@@ -1835,5 +1835,17 @@ project-switch-project
     (let ((project-current-directory-override dir))
       (call-interactively command))))
 
+;;;###autoload
+(defun project-uniquify-dirname-transform (dirname)
+  "Include `project-name' in DIRNAME if in a project."
+  (if-let (proj (project-current nil dirname))
+      (let ((root (project-root proj)))
+        (expand-file-name
+         (file-name-concat
+          (file-name-directory root)
+          (project-name proj)
+          (file-relative-name dirname root))))
+    dirname))
+
 (provide 'project)
 ;;; project.el ends here
diff --git a/lisp/uniquify.el b/lisp/uniquify.el
index d1ca455b673..b2f28a10d51 100644
--- a/lisp/uniquify.el
+++ b/lisp/uniquify.el
@@ -168,6 +168,20 @@ uniquify-list-buffers-directory-modes
 That means that when `buffer-file-name' is set to nil, `list-buffers-directory'
 contains the name of the directory which the buffer is visiting.")
 
+(defun uniquify-dirname-transform-default (dirname)
+  "Simply return DIRNAME unchanged."
+  dirname)
+
+(defcustom uniquify-dirname-transform #'uniquify-dirname-transform-default
+  "A function to transform the dirname used to uniquify a buffer.
+
+It takes a single argument: the directory of the buffer.  It
+should return a string filename (which does not need to actually
+exist in the filesystem) to use for uniquifying the buffer name."
+  :type '(choice (function-item uniquify-dirname-transform-default)
+                 function)
+  :group 'uniquify)
+
 ;;; Utilities
 
 ;; uniquify-fix-list data structure
@@ -209,7 +223,8 @@ uniquify-rationalize-file-buffer-names
   ;; this buffer.
   (with-current-buffer newbuf (setq uniquify-managed nil))
   (when dirname
-    (setq dirname (expand-file-name (directory-file-name dirname)))
+    (setq dirname (funcall uniquify-dirname-transform
+                           (expand-file-name (directory-file-name dirname))))
     (let ((fix-list (list (uniquify-make-item base dirname newbuf
                                               nil)))
 	  items)
@@ -268,10 +283,11 @@ uniquify-buffer-file-name
 	       (if (memq major-mode uniquify-list-buffers-directory-modes)
 		   list-buffers-directory))))
       (when filename
-	(directory-file-name
-	 (file-name-directory
-	  (expand-file-name
-	   (directory-file-name filename))))))))
+	 (funcall uniquify-dirname-transform
+	          (directory-file-name
+	          (file-name-directory
+	           (expand-file-name
+	            (directory-file-name filename)))))))))
 
 (defun uniquify-rerationalize-w/o-cb (fix-list)
   "Re-rationalize the buffers in FIX-LIST, but ignoring `current-buffer'."
diff --git a/test/lisp/uniquify-tests.el b/test/lisp/uniquify-tests.el
index abd61fa3504..e533c4b644c 100644
--- a/test/lisp/uniquify-tests.el
+++ b/test/lisp/uniquify-tests.el
@@ -88,6 +88,21 @@ uniquify-dirs
                        '("a/dir/" "b/dir/")))
         (mapc #'kill-buffer bufs)))))
 
+(ert-deftest uniquify-home ()
+  "uniquify works, albeit confusingly, in the presence of directories named \"~\""
+  (let (bufs)
+    (save-excursion
+      (push (find-file-noselect "~") bufs)
+      (push (find-file-noselect "./~") bufs)
+      (should (equal (mapcar #'buffer-name bufs)
+                     '("~<test>" "~<>")))
+      (push (find-file-noselect "~/foo") bufs)
+      (push (find-file-noselect "./~/foo") bufs)
+      (should (equal (mapcar #'buffer-name bufs)
+                     '("foo<~>" "foo</nonexistent>" "~<test>" "~<>")))
+      (while bufs
+        (kill-buffer (pop bufs))))))
+
 (ert-deftest uniquify-rename-to-dir ()
   "Giving a buffer a name which matches a directory doesn't rename the buffer"
   (let ((uniquify-buffer-name-style 'forward)
@@ -125,5 +140,23 @@ uniquify-space-prefix
     (should (equal (buffer-name) "| foo"))
     (kill-buffer)))
 
+(require 'project)
+(ert-deftest uniquify-project-transform ()
+  "`project-uniquify-dirname-transform' works"
+  (let ((uniquify-dirname-transform #'project-uniquify-dirname-transform)
+        (project-vc-name "foo1/bar")
+        bufs)
+    (save-excursion
+      (should (file-exists-p "../README"))
+      (push (find-file-noselect "../README") bufs)
+      (push (find-file-noselect "other/README") bufs)
+      (should (equal (mapcar #'buffer-name bufs)
+                     '("README<other>" "README<bar>")))
+      (push (find-file-noselect "foo2/bar/README") bufs)
+      (should (equal (mapcar #'buffer-name bufs)
+                     '("README<foo2/bar>" "README<other>" "README<foo1/bar>")))
+      (while bufs
+        (kill-buffer (pop bufs))))))
+
 (provide 'uniquify-tests)
 ;;; uniquify-tests.el ends here
-- 
2.41.0