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Subject: bug#77755: 31.0.50; Synchronous man does not handle error cases properly
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This is a multi-part message in MIME format.
--------------rNvXDK01HzA0Bi9EbCrwVim0
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This is about some deficiencies with the user option
`Man-prefer-synchronous-call', which got added in Emacs 30.  So it is in
fact also a bug in Emacs 30.  (Thanks to Sebastian for adding that new
option, prior to Emacs 30 I have been using my private hacks to get
synchronous man page invocations.)

Anyway, when using a non-nil value for that option, some edge/error
cases behave awkwardly:


1. ./src/emacs -Q --eval '(setq Man-prefer-synchronous-call t)'

   M-x man RET foobarbaz RET

   Results in the error "Can't find the foobarbaz manpage" (OK) with the
   minibuffer window being selected (not OK).

   The minibuffer being selected is IMO a result of the following form
   from function `Man-bgproc-sentinel':

     (let ((old-window (old-selected-window)))
       (when (window-live-p old-window)
         (select-window old-window)))

   IIUC, that form (or its predecessor) got added by Juri in bug#38164,
   commit 611b85b6 to keep the minibuffer selected when an async `man'
   fails at the time when the user is operating in the minibuffer.

   Unfortunately, that hack ensures that the minibuffer is *always*
   selected if a synchronous `man' fails.


2. ./src/emacs -Q --eval '(setq Man-prefer-synchronous-call t)'

   M-x man RET -k foobarbaz RET

   Results in the error "Can't find the k foobarbaz manpage" (not OK),
   again with the minibuffer window being selected (not OK).

   With async `man' this results in the error message "-k foobarbaz: no
   matches", which I consider OK.

   Here the problem is IMO that the following branch to detect failing
   "man -k" calls in function `Man-bgproc-sentinel':

     ((and (string-match "\\(\\`\\|\\s-\\)-k\\s-" Man-arguments)
           (eq (process-status process) 'exit)
           (= (process-exit-status process) 0)
           (= (point-min) (point-max)))
      (setq message (format "%s: no matches" Man-arguments)
            delete-buff t))

   never gets selected in the synchronous case since the `(eq
   (process-status process) 'exit)' form always evaluates to nil for
   that case.


The attached tentative patch would fix both issues.

What do you think?


In GNU Emacs 31.0.50 (build 25, x86_64-pc-linux-gnu, GTK+ Version
 3.24.38, cairo version 1.16.0) of 2025-04-11 built on sappc2
Repository revision: 695edc5b55bec645fe2df8924513826b202022b6
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12201009
System Description: Debian GNU/Linux 12 (bookworm)

Configured using:
 'configure --with-native-compilation --with-mailutils'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP
NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF
TOOLKIT_SCROLL_BARS WEBP X11 XDBE XIM XINERAMA XINPUT2 XPM XRANDR GTK3
ZLIB

Important settings:
  value of $LC_COLLATE: POSIX
  value of $LC_TIME: POSIX
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
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  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
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Load-path shadows:
None found.

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Memory information:
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Subject: bug#77755: Acknowledgement (31.0.50; Synchronous man does not
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close 77755 31.0.50
thanks

> The attached tentative patch would fix both issues.
>
> What do you think?

Thanks, everything looks correct, so I pushed your patch.

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close 77755 31.0.50
thanks

> The attached tentative patch would fix both issues.
>
> What do you think?

Thanks, everything looks correct, so I pushed your patch.
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