Subject: 29.2; Woman + grep fails

From: Thierry Volpiatto <[email-masked]>
Date: Wed, 31 Jan 2024 13:54:16 +0000

To reproduce:

M-x woman RET grep RET

Debugger entered--Lisp error: (search-failed "\\(\\\\{\\|el[ \11]*\\\\}\\)\\|\\(\n[.']\\)?[ \11]*\\\\}[ \11]*")
  re-search-forward("\\(\\\\{\\|el[ \11]*\\\\}\\)\\|\\(\n[.']\\)?[ \11]*\\\\}[ \11]*")
  (and (re-search-forward "\\(\\\\{\\|el[ \11]*\\\\}\\)\\|\\(\n[.']\\)?[ \11]*\\\\}[ \11]*") (match-beginning 1))
  (while (and (re-search-forward "\\(\\\\{\\|el[ \11]*\\\\}\\)\\|\\(\n[.']\\)?[ \11]*\\\\}[ \11]*") (match-beginning 1)) (re-search-forward "\\\\}"))
  (let ((from (point))) (woman-delete-match 0) (while (and (re-search-forward "\\(\\\\{\\|el[ \11]*\\\\}\\)\\|\\(\n[.']\\)?[ \11]*\\\\}[ \11]*") (match-beginning 1)) (re-search-forward "\\\\}")) (delete-region (if delete from (match-beginning 0)) (point)) (if (looking-at "^$") (delete-char 1)))
  (cond ((looking-at "[^{\n]*\\(\\\\\n\\)*\\\\{\\s *\\(\\\\\n\\)*") (let ((from (point))) (woman-delete-match 0) (while (and (re-search-forward "\\(\\\\{\\|el[ \11]*\\\\}\\)\\|\\(\n[.']\\)?[ \11]*\\\\}[ \11]*") (match-beginning 1)) (re-search-forward "\\\\}")) (delete-region (if delete from (match-beginning 0)) (point)) (if (looking-at "^$") (delete-char 1)))) (delete (woman-delete-line 1)))
  (let ((from (point))) (if to (delete-region (point) to)) (delete-horizontal-space) (cond ((looking-at "[^{\n]*\\(\\\\\n\\)*\\\\{\\s *\\(\\\\\n\\)*") (let ((from (point))) (woman-delete-match 0) (while (and (re-search-forward "\\(\\\\{\\|el[ \11]*\\\\}\\)\\|\\(\n[.']\\)?[ \11]*\\\\}[ \11]*") (match-beginning 1)) (re-search-forward "\\\\}")) (delete-region (if delete from (match-beginning 0)) (point)) (if (looking-at "^$") (delete-char 1)))) (delete (woman-delete-line 1))) (cond ((string= request "ie") (cond ((re-search-forward "^[.'][ \11]*el[ \11]*" nil t) (woman-delete-match 0) (woman-if-body "el" nil (not delete)))))) (goto-char from))
  woman-if-body("ie" #<marker (moves after insertion) at 29338 in *WoMan 1 grep*> t)
[...]

I could reproduce also on Emacs-30.0.50

Calling re-search-forward with the NOERROR arg in the while loop of
woman-if-body seems to fix the problem:

diff --git a/lisp/woman.el b/lisp/woman.el
index a9af46fa387..2357ba6b132 100644
--- a/lisp/woman.el
+++ b/lisp/woman.el
@@ -2566,7 +2566,8 @@ If DELETE is non-nil then delete from point."
 		       ;; "\\(\\\\{\\)\\|\\(\n[.']\\)?[ \t]*\\\\}[ \t]*"
 		       ;; Interpret bogus `el \}' as `el \{',
 		       ;; especially for Tcl/Tk man pages:
-		       "\\(\\\\{\\|el[ \t]*\\\\}\\)\\|\\(\n[.']\\)?[ \t]*\\\\}[ \t]*")
+		       "\\(\\\\{\\|el[ \t]*\\\\}\\)\\|\\(\n[.']\\)?[ \t]*\\\\}[ \t]*"
+                       nil t)
 		      (match-beginning 1))
 	       (re-search-forward "\\\\}"))
 	     (delete-region (if delete from (match-beginning 0)) (point))

In GNU Emacs 29.2 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.16.0, Xaw3d scroll bars) of 2024-01-18 built on IPad-S340
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Linux Mint 21.3

Configured using:
 'configure --bindir=/usr/local/sbin/emacs-29.1 --with-cairo
 --with-x-toolkit=lucid --with-modules --without-tree-sitter
 --without-native-compilation'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS
X11 XAW3D XDBE XIM XINPUT2 XPM LUCID ZLIB

Important settings:
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Major mode: 

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Load-path shadows:
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Memory information:
((conses 16 2099878 213964)
 (symbols 48 40659 6)
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 (string-bytes 1 13471136)
 (vectors 16 114511)
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<#secure method=pgpmime mode=sign>

-- 
Thierry