bug#34640: 26.1; ispell nil reference error when dictionary not found

[Mark Diekhans]

On the first call to ispell-word, if ispell-set-spellchecker-params fails to 
find hunspell dictionaries on the first invocation it
gives the useful error message:
  "no default hunspell diectionary found"

On subsequence calls, it fails with
   "Wrong type argument: stringp, nil"

call stack is
  string-match("," nil 0)
  split-string(nil "," t)
  ispell-parse-hunspell-affix-file(nil)
  ispell-hunspell-fill-dictionary-entry(nil) *
  ispell-start-process()
  ispell-init-process()
  ispell-buffer-local-words()
  ispell-accept-buffer-local-defs()
  ispell-word(nil nil nil t)
  funcall-interactively(ispell-word nil nil nil t)
  call-interactively(ispell-word nil nil)
  command-execute(ispell-word)

This is caused by ispell-set-spellchecker-params setting
ispell-last-program-name before it has successfully completed.

a patch is attached that fixes this problem, resulting in a correct
error message on subsequence uses of ispell-word

---------


In GNU Emacs 26.1 (build 1, x86_64-apple-darwin17.6.0, NS appkit-1561.40 
Version 10.13.5 (Build 17F77))
 of 2018-06-22 built on highsierra.internal.macports.net
Windowing system distributor 'Apple', version 10.3.1561

Configured using:
 'configure --prefix=/opt/local --without-dbus --without-gconf
 --without-libotf --without-m17n-flt --without-gpm --with-gnutls
 --with-xml2 --with-modules --infodir
 /opt/local/share/info/emacs --with-ns --with-lcms2
 'CFLAGS=-pipe -Os -arch x86_64' CPPFLAGS=-I/opt/local/include
 'LDFLAGS=-L/opt/local/lib -Wl,-headerpad_max_install_names
 -Wl,-no_pie -arch x86_64''

Configured features:
JPEG NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS
MODULES THREADS LCMS2

Important settings:
  value of $LC_ALL: en_US.UTF-8
  value of $LC_COLLATE: C
  value of $LC_CTYPE: C
  value of $LC_MESSAGES: en_US.UTF-8
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: C
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Shell

Minor modes in effect:
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  display-battery-mode: t
  display-time-mode: t
  TeX-PDF-mode: t
  shell-dirtrack-mode: t
  url-handler-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-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
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

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realgud:perldb-init realgud-lang-perl realgud-pdb
realgud:pdb-track-mode realgud:pdb-core realgud:pdb-init python
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realgud-nodejs realgud:nodejs-track-mode realgud:nodejs-core
realgud:nodejs-init realgud-lang-js realgud-kshdb
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realgud-lang-python realgud-gub realgud:gub-track-mode
realgud:gub-core realgud:gub-init realgud-gdb
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realgud-bashdb realgud:bashdb-track-mode realgud:bashdb-core
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realgud-custom load-relative cc-styles cc-align cc-engine
cc-vars cc-defs emacs-grammarly mailrc warnings advice vm-reply
vm-virtual vm-summary-faces vm-pop utf7 mm-util mail-prsvr
vm-imap vm-thread vm-mime vm-motion vm-mouse vm-toolbar vm-menu
vm-window vm-crypto vm-summary vm-folder vm-minibuf vm-misc
timezone vm-pcrisis vm-autoload vm-autoloads vm-vars vm-version
vm medutil background shell pcomplete comint ansi-color ring
exec-path-from-shell finder-inf tex-site edmacro kmacro info
package easymenu epg-config url-handlers url-parse auth-source
cl-seq eieio eieio-core cl-macs eieio-loaddefs password-cache
url-vars seq byte-opt gv bytecomp byte-compile cconv cl-loaddefs
cl-lib time-date tooltip eldoc electric uniquify ediff-hook
vc-hooks lisp-float-type mwheel term/ns-win ns-win ucs-normalize
mule-util term/common-win 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
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cus-face macroexp files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget
hashtable-print-readable backquote kqueue cocoa ns lcms2
multi-tty make-network-process emacs)

Memory information:
((conses 16 614688 60961)
 (symbols 48 49555 3)
 (miscs 40 383 1727)
 (strings 32 153310 3426)
 (string-bytes 1 4596805)
 (vectors 16 71557)
 (vector-slots 8 1518207 71332)
 (floats 8 203 571)
 (intervals 56 12272 487)
 (buffers 992 29))

--- ../orig/ispell.el   2019-02-24 10:14:18.000000000 -0800
+++ ispell.el   2019-02-24 10:17:50.000000000 -0800
@@ -1256,7 +1256,6 @@
 (defun ispell-set-spellchecker-params ()
   "Initialize some spellchecker parameters when changed or first used."
   (unless (eq ispell-last-program-name ispell-program-name)
-    (setq ispell-last-program-name ispell-program-name)
     (ispell-kill-ispell t)
     (if (and (condition-case ()
                 (progn
@@ -1371,7 +1370,8 @@
                            (nth 7 adict)))
                       adict)
                     tmp-dicts-alist :test #'equal))
-      (setq ispell-dictionary-alist tmp-dicts-alist))))
+      (setq ispell-dictionary-alist tmp-dicts-alist)))
+      (setq ispell-last-program-name ispell-program-name))
 
 (defun ispell-valid-dictionary-list ()
   "Return a list of valid dictionaries.