bug#34330: 27.0.50; shell auto-complete cannot handle special characters

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bug#34330: 27.0.50; shell auto-complete cannot handle special characters

Tadeus Prastowo
M-x shell<enter>
mkdir -p /tmp/A\ \&\ B/ABC<enter>
cd /tmp/A<tab>
cd /tmp/A\ \&\ B/ # auto-complete successful
cd /tmp/A\ \&\ B/A<tab> # cannot auto-complete to ABC

The following fixes the problem:
<enter>
exit<enter>
C-x k<enter>
C-x b
*scratch*
(setq
 shell-command-regexp
  "\\(?:\\(?:[\\][\\]\\)+\\\\[;&|
]\\|[^\\]\\\\[;&|
]\\|[^;&|
]\\)+"
  shell-command-separator-regexp
  "\\(?:\\(?:[\\][\\]\\)+[;&|
]\\|[^\\][;&|
]\\)*")

(with-eval-after-load "shell"
 (defun shell-forward-command (&optional arg)
   "Move forward across ARG shell command(s).  Does not cross lines.
See `shell-command-regexp'."
   (interactive "p")
   (let ((limit (line-end-position)))
     (if (re-search-forward (concat shell-command-regexp
"\\(\\(?:\\(?:[\\][\\]\\)+[;&|]\\|[^\\][;&|]\\)[\t ]*\\)+")
                 limit 'move arg)
      (skip-syntax-backward " "))))

 (defun shell-backward-command (&optional arg)
   "Move backward across ARG shell command(s).  Does not cross lines.
See `shell-command-regexp'."
   (interactive "p")
   (let ((limit (save-excursion (comint-bol nil) (point))))
     (when (> limit (point))
    (setq limit (line-beginning-position)))
     (skip-syntax-backward " " limit)
     (if (re-search-backward
       (format "\\(?:\\(?:[\\][\\]\\)+[;&|]\\|[^\\][;&|]\\)+[\t ]*\\(%s\\)"
           shell-command-regexp)
       limit 'move arg)
      (progn (goto-char (match-beginning 1))
         (skip-chars-forward ";&|"))))))
M-x eval-buffer<enter>
M-x shell<enter>
cd /tmp/A<tab>
cd /tmp/A\ \&\ B/ # auto-complete successful
cd /tmp/A\ \&\ B/A<tab>
cd /tmp/A\ \&\ B/ABC # auto-complete successful

In GNU Emacs 27.0.50 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2019-02-04 built on lgw01-amd64-031
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Ubuntu 16.04.5 LTS

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --build=x86_64-linux-gnu --prefix=/usr
 '--includedir=${prefix}/include' '--mandir=${prefix}/share/man'
 '--infodir=${prefix}/share/info' --sysconfdir=/etc --localstatedir=/var
 --disable-silent-rules '--libdir=${prefix}/lib/x86_64-linux-gnu'
 '--libexecdir=${prefix}/lib/x86_64-linux-gnu' --disable-maintainer-mode
 --disable-dependency-tracking --prefix=/usr --sharedstatedir=/var/lib
 --program-suffix=-snapshot --with-modules=yes --with-x=yes
 --with-x-toolkit=gtk3 --with-xwidgets=yes 'CFLAGS=-g -O2
 -fstack-protector-strong -Wformat -Werror=format-security'
 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2'
 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS GLIB
NOTIFY INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF
XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS
LIBSYSTEMD PDUMPER LCMS2 GMP

Important settings:
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  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:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-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
  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:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv
bytecomp byte-compile cconv dired dired-loaddefs format-spec rfc822 mml
easymenu mml-sec password-cache epa derived epg epg-config gnus-util
rmail rmail-loaddefs time-date mm-decode mm-bodies mm-encode mail-parse
rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs cl-lib sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils elec-pair
mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
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 threads dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
xwidget-internal move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 44122 7108)
 (symbols 48 5855 1)
 (strings 32 14936 1959)
 (string-bytes 1 491087)
 (vectors 16 8761)
 (vector-slots 8 112008 10734)
 (floats 8 17 20)
 (intervals 56 226 0)
 (buffers 992 11)
 (heap 1024 13015 994))