GNU bug report logs - #26997
25.2; Ido broken when ido-enable-dot-prefix non-nil and empty string is a choice

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Ryan <rct <at> thompsonclan.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.2; Ido broken when ido-enable-dot-prefix non-nil and empty string
 is a choice
Date: Fri, 19 May 2017 11:07:57 -0400

Open "emacs -Q" and run the following code:

(let ((ido-enable-dot-prefix t))
   (ido-completing-read "Pick: " '("" "a" "b" "c")))

Then try to type anything and you will get a message (but no backtrace):

Error in post-command-hook (ido-exhibit): (args-out-of-range "" 0)

And ido completion will be broken. This happens any time
ido-enable-dot-prefix is non-nil and "" is one of the choices for ido.
The following patch to ido.el seems to fix the problem.

diff -U3 --label /Users/ryan/temp/ido.el --label \#\<buffer\ ido.el\> 
/Users/ryan/temp/ido.el 
/var/folders/d3/ff25_6td3sjc02d8rfbwvmxc0000gn/T/buffer-content-4725Tl
--- /Users/ryan/temp/ido.el
+++ #<buffer ido.el>
@@ -3798,9 +3798,10 @@
          (lambda (item)
            (let ((name (ido-name item)))
          (if (and (or non-prefix-dot
-              (if (= (aref ido-text 0) ?.)
-                  (= (aref name 0) ?.)
-                (/= (aref name 0) ?.)))
+                          (and (> (length name) 0)
+                               (if (= (aref ido-text 0) ?.)
+                                   (= (aref name 0) ?.)
+                                 (/= (aref name 0) ?.))))
               (string-match re name))
          (cond
           ((and (eq ido-cur-item 'buffer)




In GNU Emacs 25.2.1 (x86_64-apple-darwin13.4.0, NS appkit-1265.21 
Version 10.9.5 (Build 13F1911))
of 2017-04-21 built on builder10-9.porkrind.org
Windowing system distributor 'Apple', version 10.3.1404
Configured using:
'configure --with-ns '--enable-locallisppath=/Library/Application
Support/Emacs/${version}/site-lisp:/Library/Application
Support/Emacs/site-lisp' --with-modules'

Configured features:
NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS MODULES

Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
recentf-mode: t
save-place-mode: t
ws-butler-global-mode: t
ws-butler-mode: t
winner-mode: t
sml-modeline-mode: t
savehist-mode: t
minibuffer-electric-default-mode: t
minibuffer-depth-indicate-mode: t
midnight-mode: t
ido-yes-or-no-mode: t
icomplete-mode: t
highlight-stages-global-mode: t
highlight-stages-mode: t
global-undo-tree-mode: t
undo-tree-mode: t
global-pointback-mode: t
pointback-mode: t
global-hl-line-mode: t
global-anzu-mode: t
anzu-mode: t
desktop-save-mode: t
delete-selection-mode: t
beacon-mode: t
auto-dim-other-buffers-mode: t
ido-complete-space-or-hyphen-mode: t
ido-ubiquitous-mode: t
ido-everywhere: t
pretty-symbols-mode: t
osx-pseudo-daemon-mode: t
magit-auto-revert-mode: t
global-git-commit-mode: t
async-bytecomp-package-mode: t
lexbind-mode: t
highlight-defined-mode: t
autopair-global-mode: t
autopair-mode: t
show-paren-mode: t
global-auto-complete-mode: t
auto-complete-mode: t
adjust-parens-mode: t
override-global-mode: t
diff-auto-refine-mode: t
shell-dirtrack-mode: t
tooltip-mode: t
global-eldoc-mode: t
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
blink-cursor-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
transient-mark-mode: t

Recent messages:
Error during redisplay: (jit-lock-function 134752) signaled (scan-error 
"Unbalanced parentheses" 132687 176527)
Error during redisplay: (jit-lock-function 134220) signaled (scan-error 
"Unbalanced parentheses" 132687 176515)
user-error: No further undo information
Saving file /Users/ryan/temp/ido.el...
Wrote 
/Users/ryan/.emacs.d/persistence/undo-tree/.!Users!ryan!temp!ido.el.~undo-tree~
Wrote /Users/ryan/temp/ido.el
Mark set
Error during redisplay: (jit-lock-function 133961) signaled (scan-error 
"Unbalanced parentheses" 132687 176515) [2 times]
Error during redisplay: (jit-lock-function 134461) signaled (scan-error 
"Unbalanced parentheses" 132687 176515)
Error during redisplay: (jit-lock-function 134220) signaled (scan-error 
"Unbalanced parentheses" 132687 176527)

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Message #8 received at 26997 <at> debbugs.gnu.org (full text, mbox):

From: npostavs <at> users.sourceforge.net
To: Ryan <rct <at> thompsonclan.org>
Cc: 26997 <at> debbugs.gnu.org
Subject: Re: bug#26997: 25.2;
 Ido broken when ido-enable-dot-prefix non-nil and empty string is a
 choice
Date: Sat, 20 May 2017 21:56:43 -0400

tags 26997 fixed
close 26997 26.1
quit

Ryan <rct <at> thompsonclan.org> writes:

> Open "emacs -Q" and run the following code:
>
> (let ((ido-enable-dot-prefix t))
>    (ido-completing-read "Pick: " '("" "a" "b" "c")))
>
> Then try to type anything and you will get a message (but no backtrace):
>
> Error in post-command-hook (ido-exhibit): (args-out-of-range "" 0)
>
> And ido completion will be broken. This happens any time
> ido-enable-dot-prefix is non-nil and "" is one of the choices for ido.
> The following patch to ido.el seems to fix the problem.
>

Thanks, pushed to master [1: f422b46eb1].

[1: f422b46eb1]: 2017-05-20 21:54:02 -0400
  Fix ido-enable-dot-prefix for empty choice (Bug#26997)
  http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=f422b46eb1d3c62c912ee0806486d017f5153e54

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