bug#18020: 24.3; sh-script comment indent failure involving apostrophes in comments/heredocs on previous lines

[Richard Tollerton]

This bug report will be sent to the Bug-GNU-Emacs mailing list
and the GNU bug tracker at debbugs.gnu.org.  Please check that
the From: line contains a valid email address.  After a delay of up
to one day, you should receive an acknowledgment at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

1. Create a file test.sh with the following contents. (The file variable
is for convenience in reproducing the issue; the point is to set
sh-indent-command to t.)

# -*- mode: sh-script; sh-indent-comment: t; -*-
cat <<EOF
{}
can't
EOF

testfunc () {
    # don't
# do this
}

2. Set point to the line "# do this" and hit TAB. The line remains
incorrectly indented at offset 0.

3. Remove the apostrophe from the previous line so that it reads "#
dont". Move point back to "# do this" and hit TAB. This time, the line
becomes correctly indented.


Suggested workaround follows. Note, reproducing this seems to require
the heredoc, so I'm pretty sure this is a bandaid fix, not "the" fix.

>From b08b383fccad22032a3db17bb912c564497fe2f4 Mon Sep 17 00:00:00 2001
From: Richard Tollerton <rich.tollerton@ni.com>
Date: Mon, 14 Jul 2014 14:49:52 -0500
Subject: [PATCH] * lisp/progmodes/sh-script.el (sh-get-indent-info): Inhibit
 quotation   marks in comments from affecting indentation.

---
 lisp/progmodes/sh-script.el | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/lisp/progmodes/sh-script.el b/lisp/progmodes/sh-script.el
index dd1057e..315ac66 100644
--- a/lisp/progmodes/sh-script.el
+++ b/lisp/progmodes/sh-script.el
@@ -2883,10 +2883,13 @@ STRING       This is ignored for the purposes of 
calculating
 
       (if prev-line-end
          (save-excursion
-           ;; We start off at beginning of this line.
-           ;; Scan previous statements while this is <=
-           ;; start of previous line.
+           ;; We start off at beginning of this line. Scan previous statements
+           ;; while this is <= start of previous line. Comments at the end of
+           ;; the previous line are skipped; we don't want quotation marks in
+           ;; comments to affect indentation.
            (goto-char prev-line-end)
+           (let ((ppss (syntax-ppss)))
+             (when (nth 4 ppss) (goto-char (nth 8 ppss))))
            (setq x t)
            (while (and x (setq x  (sh-prev-thing)))
              (sh-debug "at %d x is: %s  result is: %s" (point) x result)
-- 
2.0.1

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/usr/share/emacs/24.3/etc/DEBUG.


In GNU Emacs 24.3.1 (x86_64-unknown-linux-gnu, X toolkit)
 of 2014-07-01 on weregild
Configured using:
 `configure '--prefix=/usr' '--sysconfdir=/etc' '--libexecdir=/usr/lib'
 '--localstatedir=/var' '--without-all' '--with-xml2'
 '--with-x-toolkit=athena' '--with-link-time-optimization'
 '--with-makeinfo' '--with-compress-info' 'CFLAGS=-march=x86-64
 -mtune=generic -O2 -pipe -fstack-protector --param=ssp-buffer-size=4'
 'LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro'
 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Shell-script

Minor modes in effect:
  sh-electric-here-document-mode: t
  shell-dirtrack-mode: t
  xterm-mouse-mode: t
  diff-auto-refine-mode: t
  winner-mode: t
  recentf-mode: t
  show-paren-mode: t
  global-whitespace-newline-mode: t
  global-whitespace-mode: t
  electric-layout-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
B ESC O B ESC O B ESC O B ESC O B ESC O B ESC O B ESC 
O B ESC O B ESC O B ESC O B ESC O B ESC O B ESC O B 
ESC O B ESC O B ESC O B ESC O B ESC O B ESC O B ESC 
O B ESC O B ESC O B ESC O B ESC O B ESC O B ESC O B 
ESC O B ESC O B ESC O B ESC O B ESC O B ESC O B ESC 
[ 6 ~ C-s c o m m e n t RET ESC O H C-c ESC [ 1 ; 5 
D ESC : s h - i n d e n t - c o m TAB RET ESC [ < 0 
; 1 4 0 ; 5 6 M ESC [ < 0 ; 1 4 0 ; 5 6 m ESC [ 1 ; 
5 H C-y ESC ] 5 2 ; s ; I y A t K i 0 g b W 9 k Z T 
o g c 2 g t c 2 N y a X B 0 O y B z a C 1 p b m R l 
b n Q t Y 2 9 t b W V u d D o g d D s g L S o t ESC 
\ RET ESC O B ESC O B ESC O B ESC O D ESC O C ESC O 
A ESC O A ESC O B ESC O B ESC O B ESC O D ESC O C C-x 
C-s ESC x e DEL r e p o TAB r t - e m TAB b g DEL TAB 
RET

Recent messages:
Wrote 
/home/rtollert/penguin/user/rtollert/nilrats/trunk/1.0/source/tests/base/testproc_RepoDebug.sh
Mark set [2 times]
Making completion list... [4 times]
Mark set
Mark saved where search started
t
Mark set [2 times]
Saving file /home/rtollert/test.sh...
Wrote /home/rtollert/test.sh
Making completion list...

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Features:
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ob-core ob-eval org-compat org-macs org-loaddefs find-func xt-mouse
notmuch hl-line notmuch-version notmuch-message notmuch-maildir-fcc
notmuch-hello notmuch-tree notmuch-parser notmuch-show notmuch-print
notmuch-crypto notmuch-mua notmuch-address notmuch-wash diff-mode
easy-mmode coolj notmuch-query goto-addr thingatpt icalendar diary-lib
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notmuch-lib warnings cl message idna format-spec rfc822 mml mailabbrev
mail-utils gmm-utils mailheader mm-view mml-smime mml-sec smime mel
mime-def alist mcharset mcs-20 mcs-e20 pces pces-e20 pces-20 broken
pcustom path-util poe pym static apel-ver product mm-decode mm-bodies
mm-encode mailcap mail-parse rfc2231 rfc2047 rfc2045 ietf-drums woman
man winner ffap url-parse auth-source eieio byte-opt bytecomp
byte-compile cconv gnus-util mm-util mail-prsvr password-cache url-vars
ascope edmacro kmacro vc-p4 derived p4-lowlevel ediff-merg ediff-diff
ediff-wind ediff-help ediff-util ediff-mult ediff-init ediff vc
vc-dispatcher recentf tree-widget wid-edit easymenu advice help-fns
cl-lib advice-preload disp-table time-date paren grep compile comint
ansi-color ring whitespace electric cus-start cus-load xterm-frobs
tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list newcomment lisp-mode
register page menu-bar rfn-eshadow timer select scroll-bar mouse
jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer loaddefs button faces cus-face macroexp files text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process dynamic-setting
x-toolkit x multi-tty emacs)

-- 
Richard Tollerton <rich.tollerton@ni.com>