GNU bug report logs - #80346
[PATCH 1/1] support rename for zip files in archive-mode

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Package: emacs; Reported by: Timo Myyrä <timo.myyra@HIDDEN>; Keywords: patch; dated Sat, 7 Feb 2026 10:04:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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 <80346 <at> debbugs.gnu.org>; Sat, 28 Feb 2026 02:33:11 -0500 (EST)
From: =?utf-8?Q?Timo_Myyr=C3=A4?= <timo.myyra@HIDDEN>
To: 80346 <at> debbugs.gnu.org
Subject: Re: support rename for zip files in archive-mode - new patch
Date: Sat, 28 Feb 2026 09:33:09 +0200
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--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-add-'archive-file-name-auto-encode'-variable-to-ar.patch
Content-Description: [PATCH 1/1] add 'archive-file-name-auto-encode' variable to arc-mode

From 5cdd82d5d986cf583baa9fd6809f55d261a9d4ec Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Myyr=C3=A4?= <timo.myyra@HIDDEN>
Date: Sat, 28 Feb 2026 08:55:26 +0200
Subject: [PATCH 1/1] add 'archive-file-name-auto-encode' variable to arc-mode

the new buffer-local variable is used to control will the arc-mode
automatically convert new file names into
archive-file-name-coding-system before calling the archive-specific
rename operation.
---
 lisp/arc-mode.el | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/lisp/arc-mode.el b/lisp/arc-mode.el
index 92ad5bab009..8a65a708384 100644
--- a/lisp/arc-mode.el
+++ b/lisp/arc-mode.el
@@ -531,6 +531,11 @@ Its value is an `archive--file-desc'.")
 (defvar-local archive-file-name-coding-system nil)
 (put 'archive-file-name-coding-system 'permanent-local t)
 
+(defvar-local archive-file-name-auto-encode t
+  "Non-nil when archive file names will be automatically encoded in
+archive-file-name-coding-system when renaming files.")
+(put 'archive-file-name-coding-system 'permanent-local t)
+
 (cl-defstruct (archive--file-desc
                (:constructor nil)
                (:constructor archive--file-desc
@@ -1637,9 +1642,11 @@ as a relative change like \"g+rw\" as for chmod(2)."
 	(descr (archive-get-descr)))
     (if (fboundp func)
         (progn
-	  (funcall func
-		   (encode-coding-string newname
-					 archive-file-name-coding-system)
+          (funcall func
+                   (if archive-file-name-auto-encode
+                       (encode-coding-string newname
+					     archive-file-name-coding-system)
+                     newname)
 		   descr)
 	  (archive-resummarize))
       (error "Renaming is not supported for this archive type"))))
-- 
2.53.0


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0002-add-entry-file-name-to-future-history-on-archive-r.patch
Content-Description: [PATCH 1/1] add entry file name to future history on archive-rename-entry

From 92e0830a900c8acd9aabfcb8b7b3d6d643725880 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Myyr=C3=A4?= <timo.myyra@HIDDEN>
Date: Sat, 28 Feb 2026 09:11:25 +0200
Subject: [PATCH 1/1] add entry file name to future history on
 archive-rename-entry

* lisp/arc-mode: add file name as future history when renaming files.
* etc/NEWS: document the change.
---
 etc/NEWS         |  5 +++++
 lisp/arc-mode.el | 15 +++++++++------
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/etc/NEWS b/etc/NEWS
index 7367e3ccbd9..33b0d4142b9 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1025,6 +1025,11 @@ of the modified region.
 
 * Changes in Specialized Modes and Packages in Emacs 31.1
 
+** Archive-mode
+
+---
+*** 'archive-rename-entry' inserts current file name into "future history".
+
 ** Delete-selection mode
 *** New face 'delete-selection-replacement' for the replacement text
 This comes with a change to how we track what is considered "the
diff --git a/lisp/arc-mode.el b/lisp/arc-mode.el
index 8a65a708384..e31510e5e26 100644
--- a/lisp/arc-mode.el
+++ b/lisp/arc-mode.el
@@ -1632,14 +1632,17 @@ as a relative change like \"g+rw\" as for chmod(2)."
   (archive--with-ensure-extension
    archive (archive--act-files command files)))
 
-(defun archive-rename-entry (newname)
+(defun archive-rename-entry ()
   "Change the name associated with this entry in the archive file."
-  (interactive "sNew name: " archive-mode)
-  (if archive-read-only (error "Archive is read-only"))
-  (if (string= newname "")
+  (interactive nil archive-mode)
+  (when archive-read-only (error "Archive is read-only"))
+  (let* ((func (archive-name "rename-entry"))
+	 (descr (archive-get-descr))
+         (newname (read-string
+                   "New name: " nil nil
+                   (archive--file-desc-ext-file-name descr))))
+    (when (string= newname "")
       (error "Archive members may not be given empty names"))
-  (let ((func (archive-name "rename-entry"))
-	(descr (archive-get-descr)))
     (if (fboundp func)
         (progn
           (funcall func
-- 
2.53.0


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0003-support-rename-for-zip-files-in-archive-mode.patch
Content-Description: [PATCH 1/1] support rename for zip files in archive-mode

From edb1f9003dba9a8208c2538cc58f2ee91368469b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Myyr=C3=A4?= <timo.myyra@HIDDEN>
Date: Sat, 28 Feb 2026 09:17:49 +0200
Subject: [PATCH 1/1] support rename for zip files in archive-mode

Add new archieve-zip-rename-entry function in archive-mode to support
file name changes within zip files.

adds new archive-zip-rename option for setting the command name and
arguments for rename. Currently supported ones are "zipnote" and "7z".

Splits existing zip file header encoding heuristic detection as a
separate utility function so it can be shared between callers.

* lisp/arc-mode.el: add new archive-zip-rename-entry function, split
existing code to new archive-zip-file-entry-coding-system utility and
provides new buffer-local archive-zip-rename variable.
* etc/NEWS: Document the rename support.
---
 etc/NEWS         |   5 ++-
 lisp/arc-mode.el | 110 ++++++++++++++++++++++++++++++++++++-----------
 2 files changed, 88 insertions(+), 27 deletions(-)

diff --git a/etc/NEWS b/etc/NEWS
index 33b0d4142b9..a3b8c9d33c2 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1028,7 +1028,10 @@ of the modified region.
 ** Archive-mode
 
 ---
-*** 'archive-rename-entry' inserts current file name into "future history".
+*** 'archive-rename-entry' inserts current file name into "future
+history".
+
+*** archive-mode supports file rename for zip files.
 
 ** Delete-selection mode
 *** New face 'delete-selection-replacement' for the replacement text
diff --git a/lisp/arc-mode.el b/lisp/arc-mode.el
index e31510e5e26..2e6b83b2bf6 100644
--- a/lisp/arc-mode.el
+++ b/lisp/arc-mode.el
@@ -58,7 +58,7 @@
 ;; Save changed member	Y	Y	Y	Y	N	Y	Y	N
 ;; Add new member	N	N	N	N	N	N	N	N
 ;; Delete member	Y	Y	Y	Y	N	Y	N	N
-;; Rename member	Y	Y	N	N	N	N	N	N
+;; Rename member	Y	Y	Y	N	N	N	N	N
 ;; Chmod		-	Y	Y	-	N	N	N	N
 ;; Chown		-	Y	-	-	N	N	N	N
 ;; Chgrp		-	Y	-	-	N	N	N	N
@@ -300,6 +300,17 @@ Archive and member name will be added."
 		       :inline t
 		       (string :format "%v"))))
 
+(defcustom archive-zip-rename
+  (cond (archive-7z-program          `(,archive-7z-program "rn"))
+        ((executable-find "zipnote")  '("zipnote" "-w"))
+	(t                           `(,archive-7z-program "rn")))
+  "Program and its options to run in order to rename a file within the archive.
+Archive and old and new names will be added."
+  :type '(list (string :tag "Program")
+	       (repeat :tag "Options"
+		       :inline t
+		       (string :format "%v"))))
+
 (declare-function msdos-long-file-names "msdos.c")
 (defcustom archive-zip-case-fiddle (and (eq system-type 'ms-dos)
                                         (not (msdos-long-file-names)))
@@ -2052,20 +2063,42 @@ This doesn't recover lost files, it just undoes changes in the buffer itself."
 ;;; Section: Zip Archives
 
 (declare-function w32-get-console-codepage "w32proc.c")
+(defun archive-zip-file-entry-coding-system (file-header-start)
+  "Parse the descr and do some heuristics to guess filename encoding."
+  (save-restriction
+    (save-excursion
+      (widen)
+      (let* ((p file-header-start)
+             (creator (get-byte (+ p 5)))
+             (gpflags (archive-l-e (+ p 8) 2)))
+        (cond ((/= 0 (logand gpflags #x0800))
+               ;; Bit 11 of general purpose bit flags (bytes
+               ;; 8-9) of Central Directory: 1 means UTF-8
+               ;; encoded file names.
+               'utf-8-unix)
+              ;; On MS-Windows, both InfoZip's Zip and the system's
+              ;; built-in File Explorer use the console codepage for
+              ;; encoding file names.  Problem: the codepage of the system
+              ;; where the zip file was created cannot be known; we assume
+              ;; it is the same as the one of the current system.  Also,
+              ;; the zip file doesn't tell us the OS where the file was
+              ;; created, it only tells the filesystem.
+              ((and (eq system-type 'windows-nt)
+                    ;; This should be just 10 and
+                    ;; 14, but InfoZip uses 0 and
+                    ;; File Explorer uses 11(??).
+                    (memq creator '(0 10 11 14)))
+               (intern (format "cp%d" (w32-get-console-codepage))))
+              ;; The default encoding of zip archive is cp437
+              (t 'cp437))))))
+
 (defun archive-zip-summarize ()
+  ;; setting this to nil to avoid extra conversion on rename. Zip
+  ;; file's file headers have their own encoding.
+  (setq archive-file-name-auto-encode  nil)
   (goto-char (- (point-max) (- 22 18)))
   (search-backward-regexp "[P]K\005\006")
   (let ((p (archive-l-e (+ (point) 16) 4))
-        (w32-fname-encoding
-         ;; On MS-Windows, both InfoZip's Zip and the system's
-         ;; built-in File Explorer use the console codepage for
-         ;; encoding file names.  Problem: the codepage of the system
-         ;; where the zip file was created cannot be known; we assume
-         ;; it is the same as the one of the current system.  Also,
-         ;; the zip file doesn't tell us the OS where the file was
-         ;; created, it only tells the filesystem.
-         (if (eq system-type 'windows-nt)
-             (intern (format "cp%d" (w32-get-console-codepage)))))
         files)
     (when (or (= p #xffffffff) (= p -1))
       ;; If the offset of end-of-central-directory is 0xFFFFFFFF, this
@@ -2083,6 +2116,7 @@ This doesn't recover lost files, it just undoes changes in the buffer itself."
       ;; Offset to central directory:
       (setq p (archive-l-e (+ p 48) 8)))
     (setq p (+ p (point-min)))
+    ;; loop zip archive central registry headers
     (while (string= "PK\001\002" (buffer-substring p (+ p 4)))
       (let* ((creator (get-byte (+ p 5)))
              (gpflags (archive-l-e (+ p 8) 2))
@@ -2093,23 +2127,11 @@ This doesn't recover lost files, it just undoes changes in the buffer itself."
              (fnlen   (archive-l-e (+ p 28) 2))
              (exlen   (archive-l-e (+ p 30) 2))
              (fclen   (archive-l-e (+ p 32) 2))
+             (file-entry-coding-system
+              (archive-zip-file-entry-coding-system p))
              ;; (lheader (archive-l-e (+ p 42) 4))
              (efnname (let ((str (buffer-substring (+ p 46) (+ p 46 fnlen))))
-			(decode-coding-string
-			 str
-                         ;; Bit 11 of general purpose bit flags (bytes
-                         ;; 8-9) of Central Directory: 1 means UTF-8
-                         ;; encoded file names.
-                         (or (if (/= 0 (logand gpflags #x0800))
-                                 'utf-8-unix)
-                             (if (and w32-fname-encoding
-                                      (memq creator
-                                            ;; This should be just 10 and
-                                            ;; 14, but InfoZip uses 0 and
-                                            ;; File Explorer uses 11(??).
-                                            '(0 10 11 14)))
-                                 w32-fname-encoding)
-                             archive-file-name-coding-system))))
+			(decode-coding-string str file-entry-coding-system)))
              (ucsize  (if (and (or (= ucsize #xffffffff) (= ucsize -1))
                                (> exlen 0))
                           ;; APPNOTE.TXT, para 4.5.3: the Extra Field
@@ -2216,6 +2238,42 @@ This doesn't recover lost files, it just undoes changes in the buffer itself."
 		 (delete-char 1))
 		(t (message "Don't know how to change mode for this member"))))
         ))))
+
+(defun archive-zip-rename-entry (newname descr)
+  (let* ((zip-file buffer-file-name)
+         (entry-coding-system (archive-zip-file-entry-coding-system
+                               (+ archive-proper-file-start
+                                  (archive--file-desc-pos descr))))
+         (oldname (archive--file-desc-ext-file-name descr))
+         (rename-cmd (car archive-zip-rename))
+         (encoded-old (encode-coding-string oldname entry-coding-system))
+         (encoded-new (encode-coding-string newname entry-coding-system)))
+    (unless rename-cmd
+      (error "No rename command, set `archive-zip-rename'"))
+    (unless (executable-find rename-cmd)
+      (error "Zip rename support requires `%s' command in PATH" rename-cmd))
+    (cond ((string-match "zipnote\\(\\.exe\\)?$" rename-cmd)
+           (with-temp-buffer
+             (set-buffer-multibyte nil)
+             (insert (concat "@ " encoded-old "\n"))
+             (insert (concat "@=" encoded-new "\n"))
+             (apply #'call-process-region nil nil rename-cmd nil nil nil
+                    (append (cdr archive-zip-rename)
+                            (list zip-file)))))
+          ((string-match "7za?\\(\\.exe\\)?$" rename-cmd)
+           (let ((coding-system-for-write 'no-conversion))
+             (apply #'call-process rename-cmd nil nil nil
+                    (append
+                     (cdr archive-zip-rename)
+                     (list
+                      (encode-coding-string zip-file
+                                            (or file-name-coding-system
+                                                default-file-name-coding-system))
+                      encoded-old
+                      encoded-new)))))
+          (t (error "Unsupported rename command: %s" rename-cmd))))
+  (revert-buffer nil t))
+
 ;; -------------------------------------------------------------------------
 ;;; Section: Zoo Archives
 
-- 
2.53.0


--=-=-=--

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

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Date: Tue, 24 Feb 2026 16:09:33 +0200
Message-Id: <86zf4y9qsi.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Timo =?utf-8?Q?Myyr=C3=A4?= <timo.myyra@HIDDEN>
In-Reply-To: <87jyw3rti8.fsf@HIDDEN> (message from Timo
 =?utf-8?Q?Myyr=C3=A4?= on Tue, 24 Feb 2026 00:21:19 +0200)
Subject: Re: support rename for zip files in archive-mode - new patch
References: <87y0kvsqtc.fsf@HIDDEN> <863433r2ow.fsf@HIDDEN>
 <87ms121i46.fsf@HIDDEN> <86cy1ygxfd.fsf@HIDDEN>
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 <87bjhhyygg.fsf@HIDDEN> <86342tducr.fsf@HIDDEN>
 <877bs4zhea.fsf@HIDDEN> <868qckcy8t.fsf@HIDDEN>
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> From: Timo Myyrä <timo.myyra@HIDDEN>
> Cc: Timo Myyrä <timo.myyra@HIDDEN>,
>   80346 <at> debbugs.gnu.org
> Date: Tue, 24 Feb 2026 00:21:19 +0200
> 
> > Does it work with pure-ASCII file names?
> >
> > If it does work with ASCII file names, try replacing 7z with a program
> > or shell script that copy their command-line arguments to some file,
> > then examine the file to see what 7z actually gets.
> 
> Tested a bit more on Windows. The 7z case seems to work on ASCII-only
> files so it seems to work as expected.

Then I suggest to try the technique described above to see what kind
of arguments are sent to 7z and in what encoding.

> The zipnote case is more difficult to test. The default zip package for
> Windows contains bug in zipnote which causes it to crash when writing
> changes to zip file. I found some patched binary but it gives "Zip file
> structure invalid" errors. It might be caused by the extra patches as
> listed here:
> https://github.com/nihil-admirari/infozip-win-builds

If you can compile zipnote from source, I can send you a patch I used
to fix the buggy version they distribute.

> Testing zipnote on Linux, following does not work:
> 
>     (with-temp-buffer
>       (setq buffer-file-coding-system entry-coding-system)
>       (insert (concat "@ " oldname "\n"))
>       (insert (concat "@=" newname "\n"))
>       (apply #'call-process-region nil nil rename-cmd nil nil nil
>              (append (cdr archive-zip-rename)
>                      (list zip-file))))
> 
> It does not throw any error but rename does not happen.
> If I use (message ...) to print the temp buffer I get following:
> @ Myyrä121.txt
> @=Myyrä21.txt
> zipnote error: Invalid comment format (unknown entry name)

Does this work with pure-ASCII names?

It seems I goofed: call-process-region does NOT use
buffer-file-coding-system after all.  Sorry about that.  So instead
what we need to do is:

  . make the temporary buffer unibyte by using set-buffer-multibyte
  . insert the file names into this buffer after encoding them, like
    this:

      (insert (concat "@ "
                      (encode-coding-string oldname entry-coding-system)
                      "\n"))
      (insert (concat "@="
                      (encode-coding-string newname entry-coding-system)
                      "\n"))

Then call-process-region will output the temporary buffer without any
encoding, and the above should work (I hope).

> Following version works fine:
> 
>    (let ((temp-name (make-temp-file zip-file)))
>       (with-temp-file temp-name
>         (setq buffer-file-coding-system entry-coding-system)
>         (insert (concat "@ " oldname "\n"))
>         (insert (concat "@=" newname "\n")))
>       (apply #'call-process rename-cmd temp-name nil nil
>              (append (cdr archive-zip-rename)
>                      (list zip-file)))
>       (delete-file temp-name))

This is also okay, but it has a slight disadvantage that we need to
take care of deleting the temporary file ourselves.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

Message received at 80346 <at> debbugs.gnu.org:

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From: =?utf-8?Q?Timo_Myyr=C3=A4?= <timo.myyra@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: support rename for zip files in archive-mode - new patch
In-Reply-To: <865x7nd3v5.fsf@HIDDEN>
References: <87y0kvsqtc.fsf@HIDDEN> <863433r2ow.fsf@HIDDEN>
 <87ms121i46.fsf@HIDDEN> <86cy1ygxfd.fsf@HIDDEN>
 <87cy1x24j1.fsf@HIDDEN> <86ms11e0wp.fsf@HIDDEN>
 <87bjhhyygg.fsf@HIDDEN> <86342tducr.fsf@HIDDEN>
 <877bs4zhea.fsf@HIDDEN> <868qckcy8t.fsf@HIDDEN>
 <87342sze6u.fsf@HIDDEN> <865x7nd3v5.fsf@HIDDEN>
Date: Tue, 24 Feb 2026 00:21:19 +0200
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Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

Message received at 80346 <at> debbugs.gnu.org:

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Date: Mon, 23 Feb 2026 14:46:38 +0200
Message-Id: <865x7nd3v5.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Timo =?utf-8?Q?Myyr=C3=A4?= <timo.myyra@HIDDEN>
In-Reply-To: <87342sze6u.fsf@HIDDEN> (message from Timo
 =?utf-8?Q?Myyr=C3=A4?= on Sun, 22 Feb 2026 23:00:25 +0200)
Subject: Re: support rename for zip files in archive-mode - new patch
References: <87y0kvsqtc.fsf@HIDDEN> <863433r2ow.fsf@HIDDEN>
 <87ms121i46.fsf@HIDDEN> <86cy1ygxfd.fsf@HIDDEN>
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> From: Timo Myyrä <timo.myyra@HIDDEN>
> Cc: Timo Myyrä <timo.myyra@HIDDEN>,
>   80346 <at> debbugs.gnu.org
> Date: Sun, 22 Feb 2026 23:00:25 +0200
> 
> On Sun, Feb 22 2026, Eli Zaretskii wrote:
> 
> >   . why did you decide to use with-temp-file and call-process, not
> >     with-temp-buffer and call-process-region? with-temp-file writes
> >     the file only after it evaluates the body, so by the time you call
> >     call-process, the file doesn't yet have the contents you want to
> >     write to it
> >   . file-name-coding-system is usually nil (Windows is an exception),
> >     you should use
> >
> >                (or file-name-coding-system
> > 	           default-file-name-coding-system)
> >
> 
> I thought that the call-process-region would "pipe" the data to zipnote
> and would therefore be affected by the command line encoding issues.

No, it should use buffer-file-coding-system of the buffer whose text
it pipes.

And anyway, you cannot call call-process from within with-temp-file
because the file is not yet written when the body of the macro runs.
with-temp-file is for generating buffer contents that needs to be
written to a file at the end, when the body finishes, not in its
middle.

> If call-process-region works there too I can test that tomorrow.

It should, please try using call-process-region from with-temp-buffer.

> Though now that I think about this, the call-process-region would make a
> different kind of pipe. Or something different on Windows side, not sure
> how that works exactly.

It uses pipes on both Windows and Posix systems.

> Anyway, shouldn't the file has contents in place immediately after the call of
> with-temp-file?

No, only after its end.  From the doc string:

  with-temp-file is a Lisp macro in ‘subr.el’.

  (with-temp-file FILE &rest BODY)

  Create a new buffer, evaluate BODY there, and write the buffer to FILE.

So it writes the file at the very end.

> >> The above seems to work on Linux and I did test it on Windows side but
> >> neither method worked there. I kinda expected that for 7z but I would
> >> have thought the zipnote would have worked.
> >
> > The zipnote branch didn't work because of the with-temp-file issue I
> > mention above, I guess.  What didn't work in the 7z case?
> 
> I didn't check that closely, it didn't throw any error but the rename
> operation did not do anything. I'm guessing the bytes in the command
> line didn't align correctly so 7z couldn't find a match and didn't do
> any renaming. But based on your earlier responses I think that was
> expected outcome for this.

Does it work with pure-ASCII file names?

If it does work with ASCII file names, try replacing 7z with a program
or shell script that copy their command-line arguments to some file,
then examine the file to see what 7z actually gets.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

Message received at 80346 <at> debbugs.gnu.org:

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From: =?utf-8?Q?Timo_Myyr=C3=A4?= <timo.myyra@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: support rename for zip files in archive-mode - new patch
In-Reply-To: <868qckcy8t.fsf@HIDDEN>
References: <87y0kvsqtc.fsf@HIDDEN> <863433r2ow.fsf@HIDDEN>
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 <87bjhhyygg.fsf@HIDDEN> <86342tducr.fsf@HIDDEN>
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Date: Sun, 22 Feb 2026 23:00:25 +0200
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Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

Message received at 80346 <at> debbugs.gnu.org:

Received: (at 80346) by debbugs.gnu.org; 22 Feb 2026 20:35:59 +0000
From debbugs-submit-bounces <at> debbugs.gnu.org Sun Feb 22 15:35:58 2026
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Date: Sun, 22 Feb 2026 22:35:46 +0200
Message-Id: <868qckcy8t.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Timo =?utf-8?Q?Myyr=C3=A4?= <timo.myyra@HIDDEN>
In-Reply-To: <877bs4zhea.fsf@HIDDEN> (message from Timo
 =?utf-8?Q?Myyr=C3=A4?= on Sun, 22 Feb 2026 21:51:09 +0200)
Subject: Re: support rename for zip files in archive-mode - new patch
References: <87y0kvsqtc.fsf@HIDDEN> <863433r2ow.fsf@HIDDEN>
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> From: Timo Myyrä <timo.myyra@HIDDEN>
> Cc: Timo Myyrä <timo.myyra@HIDDEN>,
>   80346 <at> debbugs.gnu.org
> Date: Sun, 22 Feb 2026 21:51:09 +0200
> 
> Changed the archive-zip-rename-entry to following. Added a bit of error
> checking, changed zipnote to use temp file and encode command line by
> hand for 7z case.
> 
> (defun archive-zip-rename-entry (newname descr)
>   (let* ((zip-file buffer-file-name)
>          (entry-coding-system (archive-zip-file-entry-coding-system
>                                (+ archive-proper-file-start
>                                   (archive--file-desc-pos descr))))
>          (oldname (archive--file-desc-ext-file-name descr))
>          (rename-cmd (car archive-zip-rename)))
>     (unless rename-cmd
>       (error "No rename command, set `archive-zip-rename'"))
>     (unless (executable-find rename-cmd)
>       (error "Zip rename support requires `%s' command in PATH" rename-cmd))
>     (cond ((string-match "zipnote\\(\\.exe\\)?$" rename-cmd)
>            (let ((temp-name (make-temp-file zip-file)))
>              (with-temp-file temp-name
>                (setq buffer-file-coding-system entry-coding-system)
>                (insert (concat "@ " oldname "\n"))
>                (insert (concat "@=" newname "\n")))
>              (apply #'call-process rename-cmd temp-name nil nil
>                     (append (cdr archive-zip-rename)
>                             (list zip-file)))
>              (delete-file temp-name)))
>           ((string-match "7za?\\(\\.exe\\)?$" rename-cmd)
>            (let ((coding-system-for-write 'no-conversion))
>              (apply #'call-process rename-cmd nil nil nil
>                     (append (cdr archive-zip-rename)
>                             (list
>                              (encode-coding-string zip-file file-name-coding-system)
>                              (encode-coding-string oldname entry-coding-system)
>                              (encode-coding-string newname entry-coding-system))))))
>           (t (error "Unsupported rename command: %s" rename-cmd))))
>   (revert-buffer nil t))

This LGTM, but I have a few comments:

  . why did you decide to use with-temp-file and call-process, not
    with-temp-buffer and call-process-region? with-temp-file writes
    the file only after it evaluates the body, so by the time you call
    call-process, the file doesn't yet have the contents you want to
    write to it
  . file-name-coding-system is usually nil (Windows is an exception),
    you should use

               (or file-name-coding-system
	           default-file-name-coding-system)

> The above seems to work on Linux and I did test it on Windows side but
> neither method worked there. I kinda expected that for 7z but I would
> have thought the zipnote would have worked.

The zipnote branch didn't work because of the with-temp-file issue I
mention above, I guess.  What didn't work in the 7z case?

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

Message received at 80346 <at> debbugs.gnu.org:

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From: =?utf-8?Q?Timo_Myyr=C3=A4?= <timo.myyra@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: support rename for zip files in archive-mode - new patch
In-Reply-To: <86342tducr.fsf@HIDDEN>
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Date: Sun, 22 Feb 2026 21:51:09 +0200
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Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

Message received at 80346 <at> debbugs.gnu.org:

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Date: Sun, 22 Feb 2026 11:02:12 +0200
Message-Id: <86342tducr.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Timo =?utf-8?Q?Myyr=C3=A4?= <timo.myyra@HIDDEN>
In-Reply-To: <87bjhhyygg.fsf@HIDDEN> (message from Timo
 =?utf-8?Q?Myyr=C3=A4?= on Sun, 22 Feb 2026 10:27:59 +0200)
Subject: Re: support rename for zip files in archive-mode - new patch
References: <87y0kvsqtc.fsf@HIDDEN> <863433r2ow.fsf@HIDDEN>
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> From: Timo Myyrä <timo.myyra@HIDDEN>
> Cc: Timo Myyrä <timo.myyra@HIDDEN>,
>   80346 <at> debbugs.gnu.org
> Date: Sun, 22 Feb 2026 10:27:59 +0200
> 
> On Sun, Feb 22 2026, Eli Zaretskii wrote:
> 
> > If that is the new implementation, then the buffer-file-coding-system
> > of the buffer you create with renaming commands should be set to the
> > encoding of the file name we want to rename, and the file names
> > themselves should be inserted into the buffer without any encoding.
> > This should then cause call-process-region to encode this buffer using
> > that encoding when sending its contents to zipnote, and should
> > eliminate the need to encode the file name manually, which has its
> > problems, as I explained.
> >
> 
> So essetially following would work better:
>  printf "@ oldname\n@=newname\n" > zip.temp
>  zipnote -w < zip.temp
> 
> We write the zipnote comments to temporary buffer and set the
> buffer-file-coding-system to zip entrys coding system. Then pass that
> file as standard input for zipnote to write the info to zip archive.
> This way the encodings should work on Windows and Linux etc. correctly?

Yes.

> While researching this I found several comments on the Internet that
> MacOS and Windows (10+) would create zip archives with UTF-8 filenames
> but will not set UTF-8 bit in the zip header. I don't have Windows or
> MacOS to test these. I might have access to Windows servers to test
> later on.

For Windows, that would be a violation of the format.  macOS uses a
variant of UTF-8 by default (AFAIK), so maybe there it's more
probably, but then archive-file-name-coding-system should be already
set correctly.

In any case, if the problem is limited to a few exceptional cases, we
could document it and live with that, as I don't see any way of
solving those cases, except ask the user to specify the encoding (and
how will they know?).

> > archive-rename-entry should indeed be modified to support renaming
> > using an external program, as in the zip case.  All the other
> > implementations of the rename-entry method rename the file by directly
> > inserting the file name into the archive, so it is okay for them to
> > get the file name encoded in advance.  In the zip case, we don't want
> > the file name encoded in advance, since the rename-entry method will
> > do what is necessary for that (see above).  So we need to disable this
> > encoding in the zip case.  But setting archive-file-name-encoding to
> > nil is not the right way of doing that.  Instead, I think we should
> > have a new buffer-local variable which would disable the encoding in
> > archive-rename-entry, and this variable should be set non-nil when a
> > zip archive is visited.
> >
> 
> Would adding following work?
> 
> (defvar-local archive-file-name-auto-encode t
>   "Should archive file names be automatically encoded.")
> (put 'archive-file-name-coding-system 'permanent-local t
> 
> Then check this on archive-rename-entry and setting above to nil in
> archive-zip-summarize?

Yes, something like that.

> > I think that only worked for you because you haven't tried non-ASCII
> > file name of the zip archive itself, in particular on MS-Windows.
> 
> Can the POSIX pass data correctly, I mean the 7z case of:
> 7z rn foo.zip bar baz
> 
> Where foo.zip might be UTF-8 encoded and bar/baz might use different
> encoding?
> Disable conversions and pass correct bytes in command line?

If the file-name encoding used by the OS is the same as the encoding
of bar and baz in the zip file, then yes, it will work on Posix
systems.  (However, most Posix systems nowadays use UTF-8 as file-name
encoding.)  Otherwise we could have a problem even on Posix systems,
depending on how 7z works with non-ASCII characters (I never looked at
7z sources, so I don't know).  If they treat the file names as streams
of raw bytes, it could perhaps work on Posix systems if we manually
encode each argument as needed (the zip file name with the
file-name-coding-system and the old/new names with the encoding used
inside the zip), and then bind coding-system-for-write to
'no-conversion' around the invocation of call-process.  It's quite a
mess.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

Message received at 80346 <at> debbugs.gnu.org:

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To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: support rename for zip files in archive-mode - new patch
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Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

Message received at 80346 <at> debbugs.gnu.org:

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Date: Sun, 22 Feb 2026 08:40:38 +0200
Message-Id: <86ms11e0wp.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Timo =?utf-8?Q?Myyr=C3=A4?= <timo.myyra@HIDDEN>
In-Reply-To: <87cy1x24j1.fsf@HIDDEN> (message from Timo
 =?utf-8?Q?Myyr=C3=A4?= on Sat, 21 Feb 2026 23:03:14 +0200)
Subject: Re: support rename for zip files in archive-mode - new patch
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> From: Timo Myyrä <timo.myyra@HIDDEN>
> Cc: Timo Myyrä <timo.myyra@HIDDEN>,
>   80346 <at> debbugs.gnu.org
> Date: Sat, 21 Feb 2026 23:03:14 +0200
> 
> On Sat, Feb 21 2026, Eli Zaretskii wrote:
> 
> > You basically didn't do what I suggested above, since you are still
> > encoding the file names "by hand", and don't force Emacs to decode the
> > output from "zipnote" according to the file-name's encoding we
> > discover in the zip file?  Or what did I miss?
> 
> You are thinking earlier version. I simplified the zipnote use a bit in
> this version. It no longer creates a output file which is passed as
> input to another invocation of zipnote. It creates the input as separate
> buffer as passes that as standard input to zipnote command as is.
> Essentially doing something like:
> 'printf "@ oldname\n@=newname\n" | zipnote -w'.

Thanks, but in the future I'd appreciate this being spelled out when
you make such significant changes in the implementation.

If that is the new implementation, then the buffer-file-coding-system
of the buffer you create with renaming commands should be set to the
encoding of the file name we want to rename, and the file names
themselves should be inserted into the buffer without any encoding.
This should then cause call-process-region to encode this buffer using
that encoding when sending its contents to zipnote, and should
eliminate the need to encode the file name manually, which has its
problems, as I explained.

> I think I tried setting the coding-system-for-write/read but I didn't
> get it to work.

There should be no need to use coding-system-for-write/read in this
scenario.

> As alternative this uses 7z binary to do the rename like:
> '7z rn test.zip oldname newname'

This is a different situation, and it is problematic, because the file
names are passed on the command line.  Since the file name of the zip
file can also include non-ASCII characters, on MS-Windows we can only
support this if all of the 3 file names can be encoded in the system
codepage.  IOW, in this case none of the file names should be encoded
"by hand", we should leave the encoding to call-process.

> One open issue is how to handle archive-file-name-coding-system. I think
> this supposed to be encoding used the archive contents.

For zip files, archive-file-name-coding-system is the default encoding
of file names.  It is overridden if the zip file specifies UTF-8 for
the file, or by the console's output encoding if we are on MS-Windows.

> Problem with it
> regarding zip archives is that zip files do not have single encoding for
> the archive. Zip file has 1..n file headers which each contain info
> about which encoding is used for that file name.

But the header can only specify either UTF-8 or not, it cannot specify
any specific non-UTF-8 encoding.  If the UTF-8 bit is absent, we
assume the file names are encoded in the console's output encoding on
MS-Windows and in archive-file-name-coding-system (which inherits from
the locale) otherwise.  This is not necessarily correct, but it's the
best we can do, and it works in the "normal" cases when the zip
archive is created entirely on the same system, or if all the file
names are pure-ASCII.

> I do believe encodings of all these file entries are same if the
> archive is created by single tool. But I think it is possible for
> user to add a new file to existing archive. The new entry might use
> different encoding than the rest of the entries in the file.
> 
> Current code sets the archive-file-name-coding-system in archive-mode function as follows:
>  (setq archive-file-name-coding-system
>             (or file-name-coding-system
>                 default-file-name-coding-system
>                 locale-coding-system))
> 
> It is not set/altered for zip file when doing rename but it is used by
> archive-rename-entry to encode the newname:
>           (funcall func
>                    (encode-coding-string newname
>                                          archive-file-name-coding-system)
>                    descr)
> 
> This seems wrong for zip files.

Why is it wrong?  Please describe the situation(s) where it would be
wrong.  We decode file names in a zip archive using the information
provided by the file header, and only fall back to
archive-file-name-coding-system if nothing else works.  Why is that
wrong?

> I'm thinking archive-zip-summarize
> function should set the archive-file-name-encoding to nil so
> archive-rename-entry would run the (encode-coding... ) call with nil
> value which should not change the newname at all.

archive-rename-entry should indeed be modified to support renaming
using an external program, as in the zip case.  All the other
implementations of the rename-entry method rename the file by directly
inserting the file name into the archive, so it is okay for them to
get the file name encoded in advance.  In the zip case, we don't want
the file name encoded in advance, since the rename-entry method will
do what is necessary for that (see above).  So we need to disable this
encoding in the zip case.  But setting archive-file-name-encoding to
nil is not the right way of doing that.  Instead, I think we should
have a new buffer-local variable which would disable the encoding in
archive-rename-entry, and this variable should be set non-nil when a
zip archive is visited.

> This seems to work at least for rename. I also changed the rename
> function to following so it wraps the zipnote/7z calls in
> coding-system-for-write so the emacs writes the entries in correct encoding:
> 
> (defun archive-zip-rename-entry (newname descr)
>   (let* ((zip-file buffer-file-name)
>          (entry-coding-system (archive-zip-file-entry-coding-system
>                                (+ archive-proper-file-start
>                                   (archive--file-desc-pos descr))))
>          (oldname (archive--file-desc-ext-file-name descr))
>          (rename-cmd (car archive-zip-rename)))
>     (unless (executable-find rename-cmd)
>       (error "Zip rename support requires `%s' command in PATH" rename-cmd))
>     (let ((coding-system-for-write entry-coding-system))
>       (if (string= rename-cmd "zipnote")
>           (with-temp-buffer
>             (insert (concat "@ " oldname "\n"))
>             (insert (concat "@=" newname "\n"))
>             (apply #'call-process-region nil nil rename-cmd nil t nil
>                    (append (cdr archive-zip-rename)
>                            (list zip-file))))
>           (apply #'call-process rename-cmd nil nil nil
>                  (append (cdr archive-zip-rename)
>                          (list zip-file oldname newname))))))
>   (revert-buffer nil t))

This is still not right: using coding-system-for-write means that the
command-line arguments of zipnote, including the file name of the zip
file itself, will be encoded by entry-coding-system, which might be
wrong.  Moreover, on MS-Windows we don't support UTF-8 encoding of
command-line arguments (because the invoked program will be unable to
decode them), so file names encoded in UTF-8 in the zip archive cannot
be renamed like that if the zip file's name includes non-ASCII
characters.

(Any solution you try should also be tested on Windows when the file
name of the zip archive includes non-ASCII characters, for the reasons
I explain above.)

> The newname and oldname are decoded to emacs internal encoding before
> archive-zip-rename-entry call, then the coding-system-for-write ensures
> the names are written in same encoding as zip entry originally was given
> in. We can encode the command and arguments in same encoding as well as
> these are in ASCII characters so they get same bytes regardless of the
> zip entry's coding system.

I think that only worked for you because you haven't tried non-ASCII
file name of the zip archive itself, in particular on MS-Windows.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

Message received at 80346 <at> debbugs.gnu.org:

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From: =?utf-8?Q?Timo_Myyr=C3=A4?= <timo.myyra@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: support rename for zip files in archive-mode - new patch
In-Reply-To: <86cy1ygxfd.fsf@HIDDEN>
References: <87y0kvsqtc.fsf@HIDDEN> <863433r2ow.fsf@HIDDEN>
 <87ms121i46.fsf@HIDDEN> <86cy1ygxfd.fsf@HIDDEN>
Date: Sat, 21 Feb 2026 23:03:14 +0200
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Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

Message received at 80346 <at> debbugs.gnu.org:

Received: (at 80346) by debbugs.gnu.org; 21 Feb 2026 11:15:31 +0000
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Date: Sat, 21 Feb 2026 13:15:18 +0200
Message-Id: <86cy1ygxfd.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Timo =?utf-8?Q?Myyr=C3=A4?= <timo.myyra@HIDDEN>
In-Reply-To: <87ms121i46.fsf@HIDDEN> (message from Timo
 =?utf-8?Q?Myyr=C3=A4?= on Sat, 21 Feb 2026 12:55:05 +0200)
Subject: Re: support rename for zip files in archive-mode - new patch
References: <87y0kvsqtc.fsf@HIDDEN> <863433r2ow.fsf@HIDDEN>
 <87ms121i46.fsf@HIDDEN>
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> From: Timo Myyrä <timo.myyra@HIDDEN>
> Cc: Timo Myyrä <timo.myyra@HIDDEN>,
>   80346 <at> debbugs.gnu.org
> Date: Sat, 21 Feb 2026 12:55:05 +0200
> 
> On Sat, Feb 14 2026, Eli Zaretskii wrote:
> 
> > The use of encoding here is problematic, IMO, because
> > call-process-region will generally encode the region it sends to the
> > sub-process we invoke.  So encoding the file name "by hand" when
> > inserting it is not the best idea, because it risks double encoding,
> > which will mangle the non-ASCII characters.
> >
> > Instead, I think you need to bind coding-system-for-read to the value
> > of zip-entry-coding-system when calling call-process.  This will
> > ensure that (a) the file names are decoded correctly when they read
> > from zipnote, and (b) that the buffer-file-coding-system of the buffer
> > into which the names are read, and which you later edit and send back
> > to zipnote, will be set to the value of zip-entry-coding-system (but
> > please verify that this really works that way in practice).  Then
> > call-process-region will automatically use that encoding when it sends
> > the edited name to zipnote, and you won't need to do anything special
> > for encoding the modified name the user typed.
> 
> Here's updated full diff for review. It still has few open issues.

You basically didn't do what I suggested above, since you are still
encoding the file names "by hand", and don't force Emacs to decode the
output from "zipnote" according to the file-name's encoding we
discover in the zip file?  Or what did I miss?

Is this a full changeset, or just a delta from the last one you
posted?  That one included 3 separate patches.

> I also tried following but it did not work for me:
> 
> (defun archive-zip-rename-entry (newname descr)
>   (let* ((zip-file buffer-file-name)
>          (entry-encoding-system (archive-zip-file-entry-encoding-system
>                                  (+ archive-proper-file-start
>                                     (archive--file-desc-pos descr))))
>          (oldname (archive--file-desc-ext-file-name descr))         
>          (rename-cmd (car archive-zip-rename))
>          (process-coding-system-alist `((call-process . ,entry-encoding-system)
>                                         (call-process-region . ,entry-encoding-system))))

That's because your modifications of process-coding-system-alist are
incorrect: the key of each association in the alist is a regexp that
should match the name of the program being invoked, in this case
"zipnote".  Instead, you've put there the symbols of the Emacs
primitives.  Also, the value of each association should be a cons cell
of two encoding, not a single encoding, because we only want to change
the coding-system used by Emacs when _decoding_ output from zipnote,
we don't want to change the encoding of its command-line arguments and
the stuff we send to it in call-process-region (Emacs should
automatically use the buffer-file-coding-system of the buffer whose
contents it sends to zipnote, so no reason to force the encoding at all).

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

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From: =?utf-8?Q?Timo_Myyr=C3=A4?= <timo.myyra@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: support rename for zip files in archive-mode - new patch
In-Reply-To: <863433r2ow.fsf@HIDDEN>
References: <87y0kvsqtc.fsf@HIDDEN> <863433r2ow.fsf@HIDDEN>
Date: Sat, 21 Feb 2026 12:55:05 +0200
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Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

Message received at 80346 <at> debbugs.gnu.org:

Received: (at 80346) by debbugs.gnu.org; 14 Feb 2026 11:21:19 +0000
From debbugs-submit-bounces <at> debbugs.gnu.org Sat Feb 14 06:21:19 2026
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Date: Sat, 14 Feb 2026 13:21:03 +0200
Message-Id: <863433r2ow.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Timo =?utf-8?Q?Myyr=C3=A4?= <timo.myyra@HIDDEN>
In-Reply-To: <87y0kvsqtc.fsf@HIDDEN> (message from Timo
 =?utf-8?Q?Myyr=C3=A4?= on Sat, 14 Feb 2026 09:54:39 +0200)
Subject: Re: support rename for zip files in archive-mode - new patch
References: <87y0kvsqtc.fsf@HIDDEN>
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> From: Timo Myyrä <timo.myyra@HIDDEN>
> Date: Sat, 14 Feb 2026 09:54:39 +0200
> 
> Here's a bit more work done towards rename.
> The rename function can avoid the extra parsing if the summarize
> operation sets the archive-file-name-coding-system. The top-level
> archive-rename-entry uses this to encode the newname already.
> 
> While testing the rename I often wanted to slightly alter the existing
> name. To aid this I added commit for pushing the current entry filename
> to "future history" for easy access.
> 
> This is slightly tested on OpenBSD and seems to be working. I'll try to
> find windows installation somewhere to test the codepage handling on it
> and when generating zip archive on windows and extracting/renaming
> entries on Linux/OpenBSD.

Thanks, I have a comment on the code below.

> +(defun archive-zip-rename-entry (newname descr)
> +   (save-restriction
> +    (save-excursion
> +      (widen)
> +      (let* ((oldname (archive--file-desc-ext-file-name descr))
> +             (zipnote (executable-find "zipnote"))
> +             (zip-file buffer-file-name)
> +             (p (+ archive-proper-file-start (archive--file-desc-pos descr)))
> +             (creator (get-byte (+ p 5)))
> +             (gpflags (archive-l-e (+ p 8) 2))
> +             (inhibit-read-only t)
> +             (w32-fname-encoding (when (eq system-type 'windows-nt)
> +                                   (intern (format "cp%d" (w32-get-console-codepage)))))
> +             ;; Bit 11 of general purpose bit flags (bytes
> +             ;; 8-9) of Central Directory: 1 means UTF-8
> +             ;; encoded file names.
> +             (zip-entry-coding-system (or (when (/= 0 (logand gpflags #x0800))
> +                                            'utf-8-unix)
> +                                          (if (and w32-fname-encoding
> +                                                   (memq creator
> +                                                         ;; This should be just 10 and
> +                                                         ;; 14, but InfoZip uses 0 and
> +                                                         ;; File Explorer uses 11(??).
> +                                                         '(0 10 11 14)))
> +                                              w32-fname-encoding)
> +                                          archive-file-name-coding-system)))
> +        (unless zipnote
> +          (error "rename support requires `zipnote' command in PATH."))
> +        (with-temp-buffer
> +          (call-process zipnote nil t nil zip-file)
> +          (goto-char (point-min))
> +          (when (re-search-forward
> +                 (concat "^@ " (regexp-quote oldname) "$") nil t)
> +            (forward-line 1)
> +            (insert (concat "@="
> +                            (encode-coding-string newname zip-entry-coding-system)
> +                            "\n"))
> +            (call-process-region nil nil zipnote nil
> +                                 (current-buffer) nil "-w" zip-file)))))
> +      (revert-buffer nil t)))

The use of encoding here is problematic, IMO, because
call-process-region will generally encode the region it sends to the
sub-process we invoke.  So encoding the file name "by hand" when
inserting it is not the best idea, because it risks double encoding,
which will mangle the non-ASCII characters.

Instead, I think you need to bind coding-system-for-read to the value
of zip-entry-coding-system when calling call-process.  This will
ensure that (a) the file names are decoded correctly when they read
from zipnote, and (b) that the buffer-file-coding-system of the buffer
into which the names are read, and which you later edit and send back
to zipnote, will be set to the value of zip-entry-coding-system (but
please verify that this really works that way in practice).  Then
call-process-region will automatically use that encoding when it sends
the edited name to zipnote, and you won't need to do anything special
for encoding the modified name the user typed.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

Message received at 80346 <at> debbugs.gnu.org:

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From: =?utf-8?Q?Timo_Myyr=C3=A4?= <timo.myyra@HIDDEN>
To: eliz@HIDDEN, 80346 <at> debbugs.gnu.org
Subject: support rename for zip files in archive-mode - new patch
Date: Sat, 14 Feb 2026 09:54:39 +0200
Message-ID: <87y0kvsqtc.fsf@HIDDEN>
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--=-=-=
Content-Type: text/plain


Here's a bit more work done towards rename.
The rename function can avoid the extra parsing if the summarize
operation sets the archive-file-name-coding-system. The top-level
archive-rename-entry uses this to encode the newname already.

While testing the rename I often wanted to slightly alter the existing
name. To aid this I added commit for pushing the current entry filename
to "future history" for easy access.

This is slightly tested on OpenBSD and seems to be working. I'll try to
find windows installation somewhere to test the codepage handling on it
and when generating zip archive on windows and extracting/renaming
entries on Linux/OpenBSD.

timo


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-support-rename-for-zip-files-in-archive-mode.patch
Content-Description: [PATCH 1/1] support rename for zip files in archive-mode

From f6425262d31c9d53b90c59a3a0edd66d2d2a855c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Myyr=C3=A4?= <timo.myyra@HIDDEN>
Date: Sat, 7 Feb 2026 09:39:27 +0200
Subject: [PATCH 1/1] support rename for zip files in archive-mode

Add new archive-zip-rename-entry function in archive-mode. This provides
rename support for zip files. It calls to "zipnote" program for actual
file name renaming.

* lisp/arc-mode.el: add archive-zip-rename-entry function.
* etc/NEWS: Document the rename support.
---
 etc/NEWS         |  6 ++++++
 lisp/arc-mode.el | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/etc/NEWS b/etc/NEWS
index 093e525fa81..5ca0dbb8944 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -978,6 +978,12 @@ of the modified region.
 
 * Changes in Specialized Modes and Packages in Emacs 31.1
 
+** Archive-mode
+
+---
+*** archive-mode supports file rename for zip files.
+
+
 ** Editorconfig
 
 ---
diff --git a/lisp/arc-mode.el b/lisp/arc-mode.el
index 92ad5bab009..8787549b028 100644
--- a/lisp/arc-mode.el
+++ b/lisp/arc-mode.el
@@ -58,7 +58,7 @@
 ;; Save changed member	Y	Y	Y	Y	N	Y	Y	N
 ;; Add new member	N	N	N	N	N	N	N	N
 ;; Delete member	Y	Y	Y	Y	N	Y	N	N
-;; Rename member	Y	Y	N	N	N	N	N	N
+;; Rename member	Y	Y	Y	N	N	N	N	N
 ;; Chmod		-	Y	Y	-	N	N	N	N
 ;; Chown		-	Y	-	-	N	N	N	N
 ;; Chgrp		-	Y	-	-	N	N	N	N
@@ -2206,6 +2206,49 @@ archive-zip-chmod-entry
 		 (delete-char 1))
 		(t (message "Don't know how to change mode for this member"))))
         ))))
+
+(defun archive-zip-rename-entry (newname descr)
+   (save-restriction
+    (save-excursion
+      (widen)
+      (let* ((oldname (archive--file-desc-ext-file-name descr))
+             (zipnote (executable-find "zipnote"))
+             (zip-file buffer-file-name)
+             (p (+ archive-proper-file-start (archive--file-desc-pos descr)))
+             (creator (get-byte (+ p 5)))
+             (gpflags (archive-l-e (+ p 8) 2))
+             (inhibit-read-only t)
+             (w32-fname-encoding (when (eq system-type 'windows-nt)
+                                   (intern (format "cp%d" (w32-get-console-codepage)))))
+             ;; Bit 11 of general purpose bit flags (bytes
+             ;; 8-9) of Central Directory: 1 means UTF-8
+             ;; encoded file names.
+             (zip-entry-coding-system (or (when (/= 0 (logand gpflags #x0800))
+                                            'utf-8-unix)
+                                          (if (and w32-fname-encoding
+                                                   (memq creator
+                                                         ;; This should be just 10 and
+                                                         ;; 14, but InfoZip uses 0 and
+                                                         ;; File Explorer uses 11(??).
+                                                         '(0 10 11 14)))
+                                              w32-fname-encoding)
+                                          archive-file-name-coding-system)))
+        (unless zipnote
+          (error "rename support requires `zipnote' command in PATH."))
+        (with-temp-buffer
+          (call-process zipnote nil t nil zip-file)
+          (goto-char (point-min))
+          (when (re-search-forward
+                 (concat "^@ " (regexp-quote oldname) "$") nil t)
+            (forward-line 1)
+            (insert (concat "@="
+                            (encode-coding-string newname zip-entry-coding-system)
+                            "\n"))
+            (call-process-region nil nil zipnote nil
+                                 (current-buffer) nil "-w" zip-file)))))
+      (revert-buffer nil t)))
+
+
 ;; -------------------------------------------------------------------------
 ;;; Section: Zoo Archives
 
-- 
2.53.0


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0002-add-entry-file-name-to-future-history-on-archive-r.patch
Content-Description: [PATCH 1/1] add entry file name to future history on archive-rename-entry

From 7d4d47ded25bd4c6810a9995cafc193698040f2c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Myyr=C3=A4?= <timo.myyra@HIDDEN>
Date: Thu, 12 Feb 2026 22:28:57 +0200
Subject: [PATCH 1/1] add entry file name to future history on
 archive-rename-entry

Push the current file name as future history when renaming archive file
names. Eases for example, fixing small typos in filenames.

* lisp/arc-mode.el: add filename as future history when renaming files.
* etc/NEWS: Document the change.
---
 etc/NEWS         |  1 +
 lisp/arc-mode.el | 15 +++++++++------
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/etc/NEWS b/etc/NEWS
index 5ca0dbb8944..25c06dde535 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -983,6 +983,7 @@ of the modified region.
 ---
 *** archive-mode supports file rename for zip files.
 
+*** 'archive-rename-entry' inserts current filename into "future history".
 
 ** Editorconfig
 
diff --git a/lisp/arc-mode.el b/lisp/arc-mode.el
index 8787549b028..053c0f2e7da 100644
--- a/lisp/arc-mode.el
+++ b/lisp/arc-mode.el
@@ -1627,14 +1627,17 @@ archive-*-expunge
   (archive--with-ensure-extension
    archive (archive--act-files command files)))
 
-(defun archive-rename-entry (newname)
+(defun archive-rename-entry ()
   "Change the name associated with this entry in the archive file."
-  (interactive "sNew name: " archive-mode)
-  (if archive-read-only (error "Archive is read-only"))
-  (if (string= newname "")
+  (interactive nil archive-mode)
+  (when archive-read-only (error "Archive is read-only"))
+  (let* ((func (archive-name "rename-entry"))
+         (descr (archive-get-descr))
+         (newname (read-string
+                   "New name: " nil nil
+                   (archive--file-desc-ext-file-name descr))))
+    (when (string= newname "")
       (error "Archive members may not be given empty names"))
-  (let ((func (archive-name "rename-entry"))
-	(descr (archive-get-descr)))
     (if (fboundp func)
         (progn
 	  (funcall func
-- 
2.53.0


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0003-set-archive-file-name-coding-system-in-archive-zip.patch
Content-Description: [PATCH 1/1] set archive-file-name-coding-system in archive-zip-summarize

From 0c18c66ac7bf53eb003e471ca7f09b24667c3125 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Myyr=C3=A4?= <timo.myyra@HIDDEN>
Date: Sat, 14 Feb 2026 09:44:29 +0200
Subject: [PATCH 1/1] set archive-file-name-coding-system in
 archive-zip-summarize

store the zip filename coding system when summarizing the buffer. The
archive-rename-entry uses this variable when encoding newname. This
helps keep the archive-zip-rename-entry simple.
---
 lisp/arc-mode.el | 61 +++++++++++++++++-------------------------------
 1 file changed, 21 insertions(+), 40 deletions(-)

diff --git a/lisp/arc-mode.el b/lisp/arc-mode.el
index 053c0f2e7da..bd7963b470c 100644
--- a/lisp/arc-mode.el
+++ b/lisp/arc-mode.el
@@ -2087,22 +2087,22 @@ archive-zip-summarize
              (exlen   (archive-l-e (+ p 30) 2))
              (fclen   (archive-l-e (+ p 32) 2))
              ;; (lheader (archive-l-e (+ p 42) 4))
+             (zip-coding-system
+              ;; Bit 11 of general purpose bit flags (bytes
+              ;; 8-9) of Central Directory: 1 means UTF-8
+              ;; encoded file names.
+              (or (if (/= 0 (logand gpflags #x0800))
+                      'utf-8-unix)
+                  (if (and w32-fname-encoding
+                           (memq creator
+                                 ;; This should be just 10 and
+                                 ;; 14, but InfoZip uses 0 and
+                                 ;; File Explorer uses 11(??).
+                                 '(0 10 11 14)))
+                      w32-fname-encoding)
+                  archive-file-name-coding-system))
              (efnname (let ((str (buffer-substring (+ p 46) (+ p 46 fnlen))))
-			(decode-coding-string
-			 str
-                         ;; Bit 11 of general purpose bit flags (bytes
-                         ;; 8-9) of Central Directory: 1 means UTF-8
-                         ;; encoded file names.
-                         (or (if (/= 0 (logand gpflags #x0800))
-                                 'utf-8-unix)
-                             (if (and w32-fname-encoding
-                                      (memq creator
-                                            ;; This should be just 10 and
-                                            ;; 14, but InfoZip uses 0 and
-                                            ;; File Explorer uses 11(??).
-                                            '(0 10 11 14)))
-                                 w32-fname-encoding)
-                             archive-file-name-coding-system))))
+			(decode-coding-string str zip-coding-system)))
              (ucsize  (if (and (or (= ucsize #xffffffff) (= ucsize -1))
                                (> exlen 0))
                           ;; APPNOTE.TXT, para 4.5.3: the Extra Field
@@ -2145,6 +2145,7 @@ archive-zip-summarize
 			   (memq creator '(0 2 4 5 9))
 			   (string= (upcase efnname) efnname)))
              (ifnname (if fiddle (downcase efnname) efnname)))
+        (setq archive-file-name-coding-system zip-coding-system)
         (setq files (cons (archive--file-desc
 			   efnname ifnname mode ucsize
 			   (concat (archive-dosdate moddate)
@@ -2214,28 +2215,10 @@ archive-zip-rename-entry
    (save-restriction
     (save-excursion
       (widen)
-      (let* ((oldname (archive--file-desc-ext-file-name descr))
-             (zipnote (executable-find "zipnote"))
-             (zip-file buffer-file-name)
-             (p (+ archive-proper-file-start (archive--file-desc-pos descr)))
-             (creator (get-byte (+ p 5)))
-             (gpflags (archive-l-e (+ p 8) 2))
-             (inhibit-read-only t)
-             (w32-fname-encoding (when (eq system-type 'windows-nt)
-                                   (intern (format "cp%d" (w32-get-console-codepage)))))
-             ;; Bit 11 of general purpose bit flags (bytes
-             ;; 8-9) of Central Directory: 1 means UTF-8
-             ;; encoded file names.
-             (zip-entry-coding-system (or (when (/= 0 (logand gpflags #x0800))
-                                            'utf-8-unix)
-                                          (if (and w32-fname-encoding
-                                                   (memq creator
-                                                         ;; This should be just 10 and
-                                                         ;; 14, but InfoZip uses 0 and
-                                                         ;; File Explorer uses 11(??).
-                                                         '(0 10 11 14)))
-                                              w32-fname-encoding)
-                                          archive-file-name-coding-system)))
+      (let ((oldname (archive--file-desc-ext-file-name descr))
+            (zipnote (executable-find "zipnote"))
+            (zip-file buffer-file-name)
+            (inhibit-read-only t))
         (unless zipnote
           (error "rename support requires `zipnote' command in PATH."))
         (with-temp-buffer
@@ -2244,9 +2227,7 @@ archive-zip-rename-entry
           (when (re-search-forward
                  (concat "^@ " (regexp-quote oldname) "$") nil t)
             (forward-line 1)
-            (insert (concat "@="
-                            (encode-coding-string newname zip-entry-coding-system)
-                            "\n"))
+            (insert (concat "@=" newname "\n"))
             (call-process-region nil nil zipnote nil
                                  (current-buffer) nil "-w" zip-file)))))
       (revert-buffer nil t)))
-- 
2.53.0


--=-=-=--

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

Message received at 80346 <at> debbugs.gnu.org:

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From: =?utf-8?Q?Timo_Myyr=C3=A4?= <timo.myyra@HIDDEN>
To: 80346 <at> debbugs.gnu.org, eliz@HIDDEN
Subject: support rename for zip files in archive-mode - new patch
Date: Thu, 12 Feb 2026 22:24:52 +0200
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--=-=-=
Content-Type: text/plain

Hi,

Reworked the patch a bit.

It still uses the "zipnote" for doing the rename but parses the zip file
for deciding which encoding to use. Handling the rename operation with
elisp seems to require a lot more work. Once a filename is rewritten it
might need more bytes than before. This would change its byte offset
which in turn might affect other file offsets so most of the file data
might need to be repositioned.

Other "hacky" alternative would be to extract the file from archive,
create and move it to new name and possible new path and re-adding it
back to the archive. And cleaning up the created paths and files and
removing the old filename from the zip archive.

timo


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-support-rename-for-zip-files-in-archive-mode.patch
Content-Description: [PATCH 1/1] support rename for zip files in archive-mode

From f6425262d31c9d53b90c59a3a0edd66d2d2a855c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Myyr=C3=A4?= <timo.myyra@HIDDEN>
Date: Sat, 7 Feb 2026 09:39:27 +0200
Subject: [PATCH 1/1] support rename for zip files in archive-mode

Add new archive-zip-rename-entry function in archive-mode. This provides
rename support for zip files. It calls to "zipnote" program for actual
file name renaming.

* lisp/arc-mode.el: add archive-zip-rename-entry function.
* etc/NEWS: Document the rename support.
---
 etc/NEWS         |  6 ++++++
 lisp/arc-mode.el | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/etc/NEWS b/etc/NEWS
index 093e525fa81..5ca0dbb8944 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -978,6 +978,12 @@ of the modified region.
 
 * Changes in Specialized Modes and Packages in Emacs 31.1
 
+** Archive-mode
+
+---
+*** archive-mode supports file rename for zip files.
+
+
 ** Editorconfig
 
 ---
diff --git a/lisp/arc-mode.el b/lisp/arc-mode.el
index 92ad5bab009..8787549b028 100644
--- a/lisp/arc-mode.el
+++ b/lisp/arc-mode.el
@@ -58,7 +58,7 @@
 ;; Save changed member	Y	Y	Y	Y	N	Y	Y	N
 ;; Add new member	N	N	N	N	N	N	N	N
 ;; Delete member	Y	Y	Y	Y	N	Y	N	N
-;; Rename member	Y	Y	N	N	N	N	N	N
+;; Rename member	Y	Y	Y	N	N	N	N	N
 ;; Chmod		-	Y	Y	-	N	N	N	N
 ;; Chown		-	Y	-	-	N	N	N	N
 ;; Chgrp		-	Y	-	-	N	N	N	N
@@ -2206,6 +2206,49 @@ archive-zip-chmod-entry
 		 (delete-char 1))
 		(t (message "Don't know how to change mode for this member"))))
         ))))
+
+(defun archive-zip-rename-entry (newname descr)
+   (save-restriction
+    (save-excursion
+      (widen)
+      (let* ((oldname (archive--file-desc-ext-file-name descr))
+             (zipnote (executable-find "zipnote"))
+             (zip-file buffer-file-name)
+             (p (+ archive-proper-file-start (archive--file-desc-pos descr)))
+             (creator (get-byte (+ p 5)))
+             (gpflags (archive-l-e (+ p 8) 2))
+             (inhibit-read-only t)
+             (w32-fname-encoding (when (eq system-type 'windows-nt)
+                                   (intern (format "cp%d" (w32-get-console-codepage)))))
+             ;; Bit 11 of general purpose bit flags (bytes
+             ;; 8-9) of Central Directory: 1 means UTF-8
+             ;; encoded file names.
+             (zip-entry-coding-system (or (when (/= 0 (logand gpflags #x0800))
+                                            'utf-8-unix)
+                                          (if (and w32-fname-encoding
+                                                   (memq creator
+                                                         ;; This should be just 10 and
+                                                         ;; 14, but InfoZip uses 0 and
+                                                         ;; File Explorer uses 11(??).
+                                                         '(0 10 11 14)))
+                                              w32-fname-encoding)
+                                          archive-file-name-coding-system)))
+        (unless zipnote
+          (error "rename support requires `zipnote' command in PATH."))
+        (with-temp-buffer
+          (call-process zipnote nil t nil zip-file)
+          (goto-char (point-min))
+          (when (re-search-forward
+                 (concat "^@ " (regexp-quote oldname) "$") nil t)
+            (forward-line 1)
+            (insert (concat "@="
+                            (encode-coding-string newname zip-entry-coding-system)
+                            "\n"))
+            (call-process-region nil nil zipnote nil
+                                 (current-buffer) nil "-w" zip-file)))))
+      (revert-buffer nil t)))
+
+
 ;; -------------------------------------------------------------------------
 ;;; Section: Zoo Archives
 
-- 
2.52.0


--=-=-=--

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

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To: Timo =?utf-8?Q?Myyr=C3=A4?= <timo.myyra@HIDDEN>
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Subject: Re: bug#80346: [PATCH 1/1] support rename for zip files in
 archive-mode
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> From: Timo Myyrä <timo.myyra@HIDDEN>
> Cc: Timo Myyrä <timo.myyra@HIDDEN>,
>   80346 <at> debbugs.gnu.org
> Date: Sun, 08 Feb 2026 10:13:41 +0200
> 
> On Sat, Feb 07 2026, Eli Zaretskii wrote:
> 
> >> https://en.wikipedia.org/wiki/ZIP_(file_format)#Internationalization_issues
> >> 
> >> I'm guessing this should implement the steps listed in above wiki entry
> >> to determine the encoding to use.
> >
> > See archive-zip-summarize, it already does what can be done in
> > practice.  I guess this new function will need to do something
> > similar.
> 
> Yeah, I think so too. I'm guessing we do not require the zipnote program
> at all once the parsing is in place. I think the process of renaming
> file requires that we update the file name and file name length in the
> header and recalculate the header CRC32 value. And I think the central
> header CRC32 value should also be updated.
> 
> I'll do some research on that to see if I get it moving.

If it's clear how to do that completely safely, doing it without
zipnote would be good, especially since the last officially released
zipnote has a fatal bug that prevents it from working correctly.

> >> The second thing to consider, should we validate the user input some
> >> way to prevent creating faulty archives or trust that user knows what
> >> they are doing?
> >
> > What could users do that might make the archive faulty, if what they
> > type is interpreted as a new name of a file?  What did you have in
> > mind?
> >
> > Thanks.
> 
> I mean currently emacs polls the user for new name. What if user gives
> "//////foo" as file name? Or adds null bytes, newlines etc. as filename.
> Should we have some validation here.

Are these characters forbidden in file names in an archive?  If so, I
think we should disallow them, yes.  Or maybe zipnote (if used) will
help us reject them?

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

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To: Philip Kaludercic <philipk@HIDDEN>
Subject: Re: bug#80346: [PATCH 1/1] support rename for zip files in
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Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

Message received at 80346 <at> debbugs.gnu.org:

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Subject: Re: bug#80346: [PATCH 1/1] support rename for zip files in
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From: Philip Kaludercic <philipk@HIDDEN>
To: Timo =?utf-8?Q?Myyr=C3=A4?= <timo.myyra@HIDDEN>
Subject: Re: bug#80346: [PATCH 1/1] support rename for zip files in
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Timo Myyr=C3=A4 <timo.myyra@HIDDEN> writes:

> Hi,
>
> Here's an small patch for archive-mode to implement file rename
> operatian when opening zip files. It uses the zipnote program to do the
> actual renaming.
>
> Timo
>
> From ce1849d6f05f58df952fa17a320c19ffee8965ad Mon Sep 17 00:00:00 2001
> From: =3D?UTF-8?q?Timo=3D20Myyr=3DC3=3DA4?=3D <timo.myyra@HIDDEN>
> Date: Sat, 7 Feb 2026 09:39:27 +0200
> Subject: [PATCH 1/1] support rename for zip files in archive-mode
>
> Use "zipnote" program to provide file rename support when dealing with
> zip files with archive-mode.
>
> * lisp/arc-mode.el: support rename for zip files in archive-mode
> * etc/NEWS: Document the change
> ---
>  etc/NEWS         |  6 ++++++
>  lisp/arc-mode.el | 19 ++++++++++++++++++-
>  2 files changed, 24 insertions(+), 1 deletion(-)
>
> diff --git a/etc/NEWS b/etc/NEWS
> index 093e525fa81..5ca0dbb8944 100644
> --- a/etc/NEWS
> +++ b/etc/NEWS
> @@ -978,6 +978,12 @@ of the modified region.
>  
>  * Changes in Specialized Modes and Packages in Emacs 31.1
>=20=20
> +** Archive-mode
> +
> +---
> +*** archive-mode supports file rename for zip files.
> +
> +
>  ** Editorconfig
>=20=20
>  ---
> diff --git a/lisp/arc-mode.el b/lisp/arc-mode.el
> index 92ad5bab009..7f4e7766f85 100644
> --- a/lisp/arc-mode.el
> +++ b/lisp/arc-mode.el
> @@ -58,7 +58,7 @@
>  ;; Save changed member	Y	Y	Y	Y	N	Y	Y	N
>  ;; Add new member	N	N	N	N	N	N	N	N
>  ;; Delete member	Y	Y	Y	Y	N	Y	N	N
> -;; Rename member	Y	Y	N	N	N	N	N	N
> +;; Rename member	Y	Y	Y	N	N	N	N	N
>  ;; Chmod		-	Y	Y	-	N	N	N	N
>  ;; Chown		-	Y	-	-	N	N	N	N
>  ;; Chgrp		-	Y	-	-	N	N	N	N
> @@ -2206,6 +2206,23 @@ archive-zip-chmod-entry
>  		 (delete-char 1))
>  		(t (message "Don't know how to change mode for this member"))))
>          ))))
> +
> +(defun archive-zip-rename-entry (newname descr)
> +  (let ((oldname (archive--file-desc-ext-file-name descr))
> +        (zipnote (executable-find "zipnote"))
> +        (zip-file buffer-file-name))
> +    (unless zipnote
> +      (error "rename support requires `zipnote' command in PATH."))
> +    (with-temp-buffer
> +      (call-process zipnote nil t nil zip-file)
> +      (goto-char (point-min))
> +      (when (search-forward oldname nil t)

How robust it is to just search for "oldname"?  Are the file names
sorted, so that the actual oldname wouldn't be a substring of some other
file name?

> +        (forward-line 1)
> +        (insert (concat "@=3D" newname "\n"))
> +        (call-process-region nil nil zipnote nil
> +                             (current-buffer) nil "-w" zip-file)))
> +    (revert-buffer nil t)))
> +
>  ;; ---------------------------------------------------------------------=
----
>  ;;; Section: Zoo Archives

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

Message received at 80346 <at> debbugs.gnu.org:

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Subject: Re: bug#80346: [PATCH 1/1] support rename for zip files in
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> From: Timo Myyrä <timo.myyra@HIDDEN>
> Cc: Timo Myyrä <timo.myyra@HIDDEN>,
>   80346 <at> debbugs.gnu.org
> Date: Sat, 07 Feb 2026 18:59:53 +0200
> 
> > Isn't this search-forward too naïve?  It could find a different file
> > name if it includes OLDNAME as its substring, not?  I would suggest a
> > more strict search, for example, for (concat "\n@ " oldname " \n") or
> > something similar.  Or am I missing something?
> 
> Good point, 
> (search-forward (concat "\n@ " oldname "\n") nil t) seems to work as
> well and allows to omit the forward-line call.

Right.

> Now that I looked at this again, I noticed few open issues still.
> 
> First one is how to properly handle filename encoding. Newer zip
> formats seem to support UTF-8 but older file formats should use cp437
> but in practice use the whatever codepage was used when creating the
> file. And this information is not stored in the zip file itself. For
> extra info:
> https://en.wikipedia.org/wiki/ZIP_(file_format)#Internationalization_issues
> 
> I'm guessing this should implement the steps listed in above wiki entry
> to determine the encoding to use.

See archive-zip-summarize, it already does what can be done in
practice.  I guess this new function will need to do something
similar.

There's one complication, though: where archive-zip-summarize does the
file-name decoding in-memory, the new function you wrote will have to
decode and encode the stuff it gets from and sends to the zipnote
program.  We should force the decoding of the stuff we read from
zipnote by binding coding-system-for-read, which will then make sure
the edited list of file names will be encoded the same way when
sent as standard input to the second invocation of zipnote.

> The second thing to consider, should we validate the user input some
> way to prevent creating faulty archives or trust that user knows what
> they are doing?

What could users do that might make the archive faulty, if what they
type is interpreted as a new name of a file?  What did you have in
mind?

Thanks.

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Subject: Re: bug#80346: [PATCH 1/1] support rename for zip files in
 archive-mode
To: =?UTF-8?Q?Timo_Myyr=C3=A4?= <timo.myyra@HIDDEN>
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On Sat, Feb 7, 2026 at 12:02=E2=80=AFPM Timo Myyr=C3=A4 <timo.myyra@bittivi=
rhe.fi> wrote:

> On Sat, Feb 07 2026, Eli Zaretskii wrote:
>
> >> From: Timo Myyr=C3=A4 <timo.myyra@HIDDEN>
> >> Date: Sat, 07 Feb 2026 12:02:44 +0200
> >>
> >> Here's an small patch for archive-mode to implement file rename
> >> operatian when opening zip files. It uses the zipnote program to do th=
e
> >> actual renaming.
> >
> > Thanks.
> >
> >> * lisp/arc-mode.el: support rename for zip files in archive-mode
> >> * etc/NEWS: Document the change
> >
> > Please end each log entry with a period, and please mention the
> > function name in the arc-mode.el log entry.
> >
> >> +(defun archive-zip-rename-entry (newname descr)
> >> +  (let ((oldname (archive--file-desc-ext-file-name descr))
> >> +        (zipnote (executable-find "zipnote"))
> >> +        (zip-file buffer-file-name))
> >> +    (unless zipnote
> >> +      (error "rename support requires `zipnote' command in PATH."))
> >> +    (with-temp-buffer
> >> +      (call-process zipnote nil t nil zip-file)
> >> +      (goto-char (point-min))
> >> +      (when (search-forward oldname nil t)
> >
> > Isn't this search-forward too na=C3=AFve?  It could find a different fi=
le
> > name if it includes OLDNAME as its substring, not?  I would suggest a
> > more strict search, for example, for (concat "\n@ " oldname " \n") or
> > something similar.  Or am I missing something?
>
> Good point,
> (search-forward (concat "\n@ " oldname "\n") nil t) seems to work as
> well and allows to omit the forward-line call.
>
> Now that I looked at this again, I noticed few open issues still.
>
> First one is how to properly handle filename encoding. Newer zip
> formats seem to support UTF-8 but older file formats should use cp437
> but in practice use the whatever codepage was used when creating the
> file. And this information is not stored in the zip file itself. For
> extra info:
> https://en.wikipedia.org/wiki/ZIP_(file_format)#Internationalization_issu=
es
>
> I'm guessing this should implement the steps listed in above wiki entry
> to determine the encoding to use.
>
> The second thing to consider, should we validate the user input some
> way to prevent creating faulty archives or trust that user knows what
> they are doing?
>

It could offer to operate on a copy of the original file.

--000000000000a7299c064a3ee55d
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-family:monospace"><span style=3D"font-family:Arial,Helvetica,sans-serif">=
On Sat, Feb 7, 2026 at 12:02=E2=80=AFPM Timo Myyr=C3=A4 &lt;<a href=3D"mail=
to:timo.myyra@HIDDEN">timo.myyra@HIDDEN</a>&gt; wrote:</span>=
</div></div><div class=3D"gmail_quote gmail_quote_container"><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid=
 rgb(204,204,204);padding-left:1ex">On Sat, Feb 07 2026, Eli Zaretskii wrot=
e:<br>
<br>
&gt;&gt; From: Timo Myyr=C3=A4 &lt;<a href=3D"mailto:timo.myyra@bittivirhe.=
fi" target=3D"_blank">timo.myyra@HIDDEN</a>&gt;<br>
&gt;&gt; Date: Sat, 07 Feb 2026 12:02:44 +0200<br>
&gt;&gt; <br>
&gt;&gt; Here&#39;s an small patch for archive-mode to implement file renam=
e<br>
&gt;&gt; operatian when opening zip files. It uses the zipnote program to d=
o the<br>
&gt;&gt; actual renaming.<br>
&gt;<br>
&gt; Thanks.<br>
&gt;<br>
&gt;&gt; * lisp/arc-mode.el: support rename for zip files in archive-mode<b=
r>
&gt;&gt; * etc/NEWS: Document the change<br>
&gt;<br>
&gt; Please end each log entry with a period, and please mention the<br>
&gt; function name in the arc-mode.el log entry.<br>
&gt;<br>
&gt;&gt; +(defun archive-zip-rename-entry (newname descr)<br>
&gt;&gt; +=C2=A0 (let ((oldname (archive--file-desc-ext-file-name descr))<b=
r>
&gt;&gt; +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (zipnote (executable-find &quot;zipno=
te&quot;))<br>
&gt;&gt; +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (zip-file buffer-file-name))<br>
&gt;&gt; +=C2=A0 =C2=A0 (unless zipnote<br>
&gt;&gt; +=C2=A0 =C2=A0 =C2=A0 (error &quot;rename support requires `zipnot=
e&#39; command in PATH.&quot;))<br>
&gt;&gt; +=C2=A0 =C2=A0 (with-temp-buffer<br>
&gt;&gt; +=C2=A0 =C2=A0 =C2=A0 (call-process zipnote nil t nil zip-file)<br=
>
&gt;&gt; +=C2=A0 =C2=A0 =C2=A0 (goto-char (point-min))<br>
&gt;&gt; +=C2=A0 =C2=A0 =C2=A0 (when (search-forward oldname nil t)<br>
&gt;<br>
&gt; Isn&#39;t this search-forward too na=C3=AFve?=C2=A0 It could find a di=
fferent file<br>
&gt; name if it includes OLDNAME as its substring, not?=C2=A0 I would sugge=
st a<br>
&gt; more strict search, for example, for (concat &quot;\n@ &quot; oldname =
&quot; \n&quot;) or<br>
&gt; something similar.=C2=A0 Or am I missing something?<br>
<br>
Good point, <br>
(search-forward (concat &quot;\n@ &quot; oldname &quot;\n&quot;) nil t) see=
ms to work as<br>
well and allows to omit the forward-line call.<br>
<br>
Now that I looked at this again, I noticed few open issues still.<br>
<br>
First one is how to properly handle filename encoding. Newer zip<br>
formats seem to support UTF-8 but older file formats should use cp437<br>
but in practice use the whatever codepage was used when creating the<br>
file. And this information is not stored in the zip file itself. For<br>
extra info:<br>
<a href=3D"https://en.wikipedia.org/wiki/ZIP_(file_format)#Internationaliza=
tion_issues" rel=3D"noreferrer" target=3D"_blank">https://en.wikipedia.org/=
wiki/ZIP_(file_format)#Internationalization_issues</a><br>
<br>
I&#39;m guessing this should implement the steps listed in above wiki entry=
<br>
to determine the encoding to use.<br>
<br>
The second thing to consider, should we validate the user input some<br>
way to prevent creating faulty archives or trust that user knows what<br>
they are doing?<br></blockquote><div><br></div><div class=3D"gmail_default"=
 style=3D"font-family:monospace">It could offer to operate on a copy of the=
 original file.</div></div></div>

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From: =?utf-8?Q?Timo_Myyr=C3=A4?= <timo.myyra@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#80346: [PATCH 1/1] support rename for zip files in
 archive-mode
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References: <87ecmw3m7v.fsf@HIDDEN> <86v7g8vjv7.fsf@HIDDEN>
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bug#80346; Package emacs. Full text available.

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Date: Sat, 07 Feb 2026 14:06:04 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
To: Timo =?utf-8?Q?Myyr=C3=A4?= <timo.myyra@HIDDEN>
In-Reply-To: <87ecmw3m7v.fsf@HIDDEN> (message from Timo
 =?utf-8?Q?Myyr=C3=A4?= on Sat, 07 Feb 2026 12:02:44 +0200)
Subject: Re: bug#80346: [PATCH 1/1] support rename for zip files in
 archive-mode
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> From: Timo Myyrä <timo.myyra@HIDDEN>
> Date: Sat, 07 Feb 2026 12:02:44 +0200
> 
> Here's an small patch for archive-mode to implement file rename
> operatian when opening zip files. It uses the zipnote program to do the
> actual renaming.

Thanks.

> * lisp/arc-mode.el: support rename for zip files in archive-mode
> * etc/NEWS: Document the change

Please end each log entry with a period, and please mention the
function name in the arc-mode.el log entry.

> +(defun archive-zip-rename-entry (newname descr)
> +  (let ((oldname (archive--file-desc-ext-file-name descr))
> +        (zipnote (executable-find "zipnote"))
> +        (zip-file buffer-file-name))
> +    (unless zipnote
> +      (error "rename support requires `zipnote' command in PATH."))
> +    (with-temp-buffer
> +      (call-process zipnote nil t nil zip-file)
> +      (goto-char (point-min))
> +      (when (search-forward oldname nil t)

Isn't this search-forward too naïve?  It could find a different file
name if it includes OLDNAME as its substring, not?  I would suggest a
more strict search, for example, for (concat "\n@ " oldname " \n") or
something similar.  Or am I missing something?

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

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To: bug-gnu-emacs@HIDDEN
Subject: [PATCH 1/1] support rename for zip files in archive-mode
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--=-=-=
Content-Type: text/plain

Hi,

Here's an small patch for archive-mode to implement file rename
operatian when opening zip files. It uses the zipnote program to do the
actual renaming.

Timo


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-support-rename-for-zip-files-in-archive-mode.patch
Content-Description: [PATCH 1/1] support rename for zip files in archive-mode

From ce1849d6f05f58df952fa17a320c19ffee8965ad Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Myyr=C3=A4?= <timo.myyra@HIDDEN>
Date: Sat, 7 Feb 2026 09:39:27 +0200
Subject: [PATCH 1/1] support rename for zip files in archive-mode

Use "zipnote" program to provide file rename support when dealing with
zip files with archive-mode.

* lisp/arc-mode.el: support rename for zip files in archive-mode
* etc/NEWS: Document the change
---
 etc/NEWS         |  6 ++++++
 lisp/arc-mode.el | 19 ++++++++++++++++++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/etc/NEWS b/etc/NEWS
index 093e525fa81..5ca0dbb8944 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -978,6 +978,12 @@ of the modified region.
 
 * Changes in Specialized Modes and Packages in Emacs 31.1
 
+** Archive-mode
+
+---
+*** archive-mode supports file rename for zip files.
+
+
 ** Editorconfig
 
 ---
diff --git a/lisp/arc-mode.el b/lisp/arc-mode.el
index 92ad5bab009..7f4e7766f85 100644
--- a/lisp/arc-mode.el
+++ b/lisp/arc-mode.el
@@ -58,7 +58,7 @@
 ;; Save changed member	Y	Y	Y	Y	N	Y	Y	N
 ;; Add new member	N	N	N	N	N	N	N	N
 ;; Delete member	Y	Y	Y	Y	N	Y	N	N
-;; Rename member	Y	Y	N	N	N	N	N	N
+;; Rename member	Y	Y	Y	N	N	N	N	N
 ;; Chmod		-	Y	Y	-	N	N	N	N
 ;; Chown		-	Y	-	-	N	N	N	N
 ;; Chgrp		-	Y	-	-	N	N	N	N
@@ -2206,6 +2206,23 @@ archive-zip-chmod-entry
 		 (delete-char 1))
 		(t (message "Don't know how to change mode for this member"))))
         ))))
+
+(defun archive-zip-rename-entry (newname descr)
+  (let ((oldname (archive--file-desc-ext-file-name descr))
+        (zipnote (executable-find "zipnote"))
+        (zip-file buffer-file-name))
+    (unless zipnote
+      (error "rename support requires `zipnote' command in PATH."))
+    (with-temp-buffer
+      (call-process zipnote nil t nil zip-file)
+      (goto-char (point-min))
+      (when (search-forward oldname nil t)
+        (forward-line 1)
+        (insert (concat "@=" newname "\n"))
+        (call-process-region nil nil zipnote nil
+                             (current-buffer) nil "-w" zip-file)))
+    (revert-buffer nil t)))
+
 ;; -------------------------------------------------------------------------
 ;;; Section: Zoo Archives
 
-- 
2.52.0


--=-=-=--

Acknowledgement sent to Timo Myyrä <timo.myyra@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.

Report forwarded to bug-gnu-emacs@HIDDEN:
bug#80346; Package emacs. Full text available.

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