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bug#26249: 26.0.50; vc-hg.el assumes wrong default ignore pattern syntax

From: Jim Blandy
Subject: bug#26249: 26.0.50; vc-hg.el assumes wrong default ignore pattern syntax
Date: Fri, 24 Mar 2017 18:07:18 -0700

The problem requires vc-hg-state-fast to try to take the fast path, so you need to follow these instructions exactly (except that ~/emacs/src/emacs can be whatever your development emacs executable is):

$ hg init snoo
$ cd snoo
$ echo '\.py(c|o)$' > .hgignore
$ hg add .hgignore
$ echo hi > file
$ ~/emacs/src/emacs -Q file

You should see this error in the minibuffer:

Error: (invalid-regexp "Unmatched ) or \\)")

The problem is that vc-hg--slurp-hgignore-1 believes that default-syntax should be vc-hg--hgignore-add-glob, but the default syntax in an .hgignore file is actually Python/Perl regular expressions. Changing the default value to vc-hg--hgignore-add-pcre seems to fix the problem:

modified   lisp/vc/vc-hg.el
@@ -826,7 +826,7 @@ vc-hg--hgignore-add-path
 (defun vc-hg--slurp-hgignore-1 (hgignore prefix)
-  (let ((default-syntax 'vc-hg--hgignore-add-glob))
+  (let ((default-syntax 'vc-hg--hgignore-add-pcre))
       (let ((attr (file-attributes hgignore)))
         (when attr (insert-file-contents hgignore))

In GNU Emacs 26.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.10)
 of 2017-03-24 built on shibui
Repository revision: 211d41a6fe23fefef0e29d036d8599716e484657
Windowing system distributor 'Fedora Project', version 11.0.11901000
System Description:    Fedora release 25 (Twenty Five)

Recent messages:
Running git commit -- [2 times]
Diffing changes to be committed (C-g to abort diffing) [2 times]
When done with a buffer, type C-c C-c
Type C-c C-c to finish, or C-c C-k to cancel
Saving file /home/jimb/emacs/.git/COMMIT_EDITMSG...
Wrote /home/jimb/emacs/.git/COMMIT_EDITMSG
Git finished [2 times]
Quit [3 times]
C-h x is undefined

Configured features:

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

Major mode: Fundamental

Minor modes in effect:
  magit-auto-revert-mode: t
  auto-revert-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  icomplete-mode: t
  rcirc-track-minor-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/jimb/elisp/haskell-mode-2.4/haskell-font-lock hides /home/jimb/.emacs.d/elpa/haskell-mode-20170204.556/haskell-font-lock
/home/jimb/elisp/haskell-mode-2.4/haskell-cabal hides /home/jimb/.emacs.d/elpa/haskell-mode-20170204.556/haskell-cabal
/home/jimb/elisp/haskell-mode-2.4/haskell-mode hides /home/jimb/.emacs.d/elpa/haskell-mode-20170204.556/haskell-mode
/home/jimb/elisp/haskell-mode-2.4/inf-haskell hides /home/jimb/.emacs.d/elpa/haskell-mode-20170204.556/inf-haskell
/home/jimb/elisp/haskell-mode-2.4/haskell-doc hides /home/jimb/.emacs.d/elpa/haskell-mode-20170204.556/haskell-doc
/home/jimb/elisp/haskell-mode-2.4/haskell-decl-scan hides /home/jimb/.emacs.d/elpa/haskell-mode-20170204.556/haskell-decl-scan
/home/jimb/elisp/haskell-mode-2.4/haskell-indent hides /home/jimb/.emacs.d/elpa/haskell-mode-20170204.556/haskell-indent

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alt-dired-view dired dired-loaddefs diff-find-mq-file mozilla-c-style
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url-methods url-history url-cookie url-domsuf url-util mailcap jimb-js
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cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind inotify
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 613476 13950)
 (symbols 48 43918 6)
 (miscs 40 302 811)
 (strings 32 105682 19279)
 (string-bytes 1 3435161)
 (vectors 16 66603)
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 (intervals 56 31616 4429)
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