bug#53405: 29.0.50; tramp-debug-buffer-command-completion-p errors on short buffers

bug#53405: 29.0.50; tramp-debug-buffer-command-completion-p errors on short buffers

[Andrew Hyatt]

[-- Attachment #1: tramp-patch --]
[-- Type: application/octet-stream, Size: 579 bytes --]

diff --git a/lisp/net/tramp.el b/lisp/net/tramp.el
index 7d6157ed8c..1cf187769f 100644
--- a/lisp/net/tramp.el
+++ b/lisp/net/tramp.el
@@ -1926,7 +1926,8 @@ tramp-debug-buffer-command-completion-p
   "A predicate for Tramp interactive commands.
 They are completed by \"M-x TAB\" only in Tramp debug buffers."
   (with-current-buffer buffer
-    (string-equal (buffer-substring 1 10) ";; Emacs:")))
+    (string-equal (buffer-substring 1 (min 10 (+ 1 (buffer-size))))
+                  ";; Emacs:")))
 
 (put #'tramp-debug-buffer-command-completion-p 'tramp-suppress-trace t)
 

[-- Attachment #2: Type: text/plain, Size: 28397 bytes --]


tramp-debug-buffer-command-completion-p causes issues with 
alternative completion frameworks (at least, it does in Vertico). 
The predicate is incorrectly written - in any buffer of size < 9, 
it will error when trying to create a 9-character substring.

This is executed when read-extended-command-predicate is set to 
#'command-completion-default-include-p, and tramp is loaded.

This doesn't cause problems normally, because 
read-extended-command quickly catches the error. However, other 
completion engines can get messed up by this. If there's an 
understanding that this function can throw errors and that's OK, 
it's not mentioned in the docstring of 
read-extended-command-predicate, so I think it's reasonable to 
fix.

Patch to fix is attached.

In GNU Emacs 29.0.50 (build 1, aarch64-apple-darwin21.2.0, NS appkit-2113.20 Version 12.1 (Build 21C52))
 of 2021-12-26 built on andrews-mbp.lan
Repository revision: 978987f7ad58cd66fe51cefde53ba4771b189aeb
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2113
System Description:  macOS 12.1

Configured using:
 'configure --with-native-compilation'
Configured features:
ACL GLIB GNUTLS JSON LCMS2 LIBXML2 MODULES NATIVE_COMP NOTIFY KQUEUE NS
PDUMPER PNG RSVG SQLITE3 THREADS TOOLKIT_SCROLL_BARS XIM ZLIB
Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

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google-translate-core-ui facemenu popup ido google-translate-core
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popup-autoloads flycheck-aspell ispell flycheck-aspell-autoloads
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default-text-scale-autoloads elfeed-show elfeed-search vc-mtn vc-hg
vc-git vc-bzr vc-src vc-sccs vc-svn vc-cvs vc-rcs vc vc-dispatcher
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xml-query elfeed-autoloads anki-editor request autorevert filenotify
ox-odt rng-loc rng-uri rng-parse rng-match rng-dt rng-util rng-pttrn
nxml-parse nxml-ns nxml-enc xmltok nxml-util ox-latex ox-icalendar
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notmuch-company notmuch-parser notmuch-wash diff-mode coolj
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crm notmuch-lib notmuch-compat hl-line message yank-media rmc puny
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logito-autoloads pcache-autoloads magit-popup format-spec
magit-popup-autoloads magit-autoloads magit-section-autoloads
git-commit-autoloads with-editor-autoloads transient-autoloads yasnippet
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major-mode-hydra-autoloads pretty-hydra-autoloads s-autoloads
hydra-autoloads lv-autoloads expand-region subword-mode-expansions
text-mode-expansions er-basic-expansions expand-region-core
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mc-mark-pop mc-edit-lines mc-hide-unmatched-lines-mode mc-mark-more
mc-cycle-cursors multiple-cursors-core advice rect
multiple-cursors-autoloads avy ring avy-autoloads winum-autoloads
consult-flycheck-autoloads flycheck-autoloads let-alist-autoloads
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embark-autoloads marginalia marginalia-autoloads savehist orderless
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use-package-diminish use-package-bind-key bind-key use-package-core
quail avoid so-long cap-words superword subword comp comp-cstr warnings
rx time delsel use-package-autoloads bind-key-autoloads
straight-autoloads cl-extra straight info autoload radix-tree easy-mmode
pcase checkdoc lisp-mnt mail-parse rfc2231 rfc2047 rfc2045 mm-util
ietf-drums mail-prsvr dired dired-loaddefs thingatpt help-mode
finder-inf package browse-url url url-proxy url-privacy url-expand
url-methods url-history url-cookie url-domsuf url-util mailcap
url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs
eieio-loaddefs password-cache json map url-vars seq gv subr-x byte-opt
bytecomp byte-compile cconv cl-loaddefs cl-lib iso-transl tooltip eldoc
paren electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode
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 lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
font-lock syntax font-core term/tty-colors frame minibuffer 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 emoji-zwj charscript
charprop case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice button loaddefs faces cus-face macroexp files
window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget keymap hashtable-print-readable backquote threads
kqueue cocoa ns lcms2 multi-tty make-network-process native-compile
emacs)

Memory information:
((conses 16 1120039 132840)
 (symbols 48 59529 5)
 (strings 32 258596 12406)
 (string-bytes 1 9196158)
 (vectors 16 112717)
 (vector-slots 8 2678280 126529)
 (floats 8 1589 1881)
 (intervals 56 12069 3743)
 (buffers 992 51))

bug#53405: 29.0.50; tramp-debug-buffer-command-completion-p errors on short buffers

[Michael Albinus]

Andrew Hyatt <ahyatt@gmail.com> writes:

Hi Andrew,

> tramp-debug-buffer-command-completion-p causes issues with alternative
> completion frameworks (at least, it does in Vertico). The predicate is
> incorrectly written - in any buffer of size < 9, it will error when
> trying to create a 9-character substring.

Thanks for the report. This is a duplicate of bug#53367, which is fixed
already in master. Closing this report, therefore.

Best regards, Michael.