GNU bug report logs - #71750
29.4; hs-hide-all can't handle unmatched pairs in Org-mode

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Forty Five <mathewegeorge <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.4; hs-hide-all can't handle unmatched pairs in Org-mode
Date: Mon, 24 Jun 2024 21:25:31 +0530

If an Org entry contains an unmatched pairing character (as defined by
the syntax table), `hs-hide-all' will fail to fold anything, with an
error as demonstrated by the recipe below:

;;; recipe.el
(scratch-buffer)
(insert "* heading\n(")
(org-mode)
(hs-minor-mode)
(hs-hide-all)
;;;recipe.el ends here

$ emacs -Q --batch -l recipe.el
Hiding all blocks...

Error: scan-error ("Unbalanced parentheses" 11 12)
  mapbacktrace(#f(compiled-function (evald func args flags) #<bytecode -0x13a4d4fc50517829>))
  debug-early-backtrace()
  debug-early(error (scan-error "Unbalanced parentheses" 11 12))
  scan-sexps(11 1)
  forward-sexp(1)
  hs-forward-sexp((11 12 #<buffer *scratch*>) 1)
  hs-hide-block-at-point(t)
  hs-hide-all()
  load-with-code-conversion("/home/user/recipe.el" "/home/user/recipe.el" nil t)
  command-line-1(("-l" "recipe.el"))
  command-line()
  normal-top-level()
Scan error: "Unbalanced parentheses", 11, 12


In GNU Emacs 29.4 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.42,
cairo version 1.18.0)
System Description: Arch Linux

Configured using:
 'configure --with-pgtk --with-native-compilation=aot --sysconfdir=/etc
 --prefix=/usr --libexecdir=/usr/lib --with-tree-sitter
 --localstatedir=/var --with-cairo --disable-build-details
 --with-harfbuzz --with-libsystemd --with-modules 'CFLAGS=-march=x86-64
 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=3
 -Wformat -Werror=format-security -fstack-clash-protection
 -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -g
 -ffile-prefix-map=/build/emacs/src=/usr/src/debug/emacs -flto=auto'
 'LDFLAGS=-Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro
 -Wl,-z,now -Wl,-z,pack-relative-relocs -flto=auto'
 'CXXFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions
 -Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security
 -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer
 -mno-omit-leaf-frame-pointer -Wp,-D_GLIBCXX_ASSERTIONS -g
 -ffile-prefix-map=/build/emacs/src=/usr/src/debug/emacs -flto=auto''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY
PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM GTK3 ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  buffer-read-only: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util text-property-search time-date mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs
comp comp-cstr warnings icons subr-x rx cl-seq cl-macs gv cl-extra
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ietf-drums mm-util mail-prsvr mail-utils rmc iso-transl tooltip cconv
eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type
elisp-mode mwheel term/pgtk-win pgtk-win term/common-win pgtk-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
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cyrillic chinese composite emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button
loaddefs theme-loaddefs faces cus-face macroexp files window
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget keymap hashtable-print-readable backquote threads dbusbind
inotify dynamic-setting system-font-setting font-render-setting cairo
gtk pgtk lcms2 multi-tty make-network-process native-compile emacs)

Memory information:
((conses 16 77261 5726)
 (symbols 48 7109 0)
 (strings 32 19602 2346)
 (string-bytes 1 595262)
 (vectors 16 15680)
 (vector-slots 8 327971 13482)
 (floats 8 27 46)
 (intervals 56 378 1)
 (buffers 984 12))

Message #8 received at 71750 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Forty Five <mathewegeorge <at> gmail.com>
Cc: 71750 <at> debbugs.gnu.org
Subject: Re: bug#71750: 29.4;
 hs-hide-all can't handle unmatched pairs in Org-mode
Date: Thu, 27 Jun 2024 12:13:00 +0300

> From: Forty Five <mathewegeorge <at> gmail.com>
> Date: Mon, 24 Jun 2024 21:25:31 +0530
> 
> If an Org entry contains an unmatched pairing character (as defined by
> the syntax table), `hs-hide-all' will fail to fold anything, with an
> error as demonstrated by the recipe below:
> 
> ;;; recipe.el
> (scratch-buffer)
> (insert "* heading\n(")
> (org-mode)
> (hs-minor-mode)
> (hs-hide-all)
> ;;;recipe.el ends here
> 
> $ emacs -Q --batch -l recipe.el
> Hiding all blocks...
> 
> Error: scan-error ("Unbalanced parentheses" 11 12)
>   mapbacktrace(#f(compiled-function (evald func args flags) #<bytecode -0x13a4d4fc50517829>))
>   debug-early-backtrace()
>   debug-early(error (scan-error "Unbalanced parentheses" 11 12))
>   scan-sexps(11 1)
>   forward-sexp(1)
>   hs-forward-sexp((11 12 #<buffer *scratch*>) 1)
>   hs-hide-block-at-point(t)
>   hs-hide-all()
>   load-with-code-conversion("/home/user/recipe.el" "/home/user/recipe.el" nil t)
>   command-line-1(("-l" "recipe.el"))
>   command-line()
>   normal-top-level()
> Scan error: "Unbalanced parentheses", 11, 12

What do we expect hs-hide-all to do in this case?

Message #11 received at 71750 <at> debbugs.gnu.org (full text, mbox):

From: Mathew George <mathewegeorge <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 71750 <at> debbugs.gnu.org
Subject: Re: bug#71750: 29.4; hs-hide-all can't handle unmatched pairs in Org-mode
Date: Thu, 27 Jun 2024 18:36:18 +0530

> What do we expect hs-hide-all to do in this case?

So, it looks like I got confused here. I thought I was invoking `hs-hide-all` to fold all
Org headings; I was actually invoking a different function of my own, which calls
`hs-hide-all` followed by `outline-show-only-headings`, and it was
aborting with the scan-error from `hs-hide-all`. `hs-hide-all` does not fold Org
headings, which is what I thought it was doing.

With that said, the scan-error is still kind of odd. So I think I have the same question as
you - what is `hs-hide-all`, and hs-minor-mode in general, able to do in
Org-mode? If it doesn't do anything, shouldn't `hs-grok-mode-type` produce an
error like 'Org Mode doesn't support Hideshow Minor Mode'? I can just
`condition-case` the scan-error in my function, but maybe we want Hideshow to 
fail in a more intelligible way...

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