GNU bug report logs - #49186
ansi-term switch to char mode immediately executes string at prompt

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

From: simon254 <at> mailbox.org
To: "bug-gnu-emacs <at> gnu.org" <bug-gnu-emacs <at> gnu.org>
Subject: ansi-term switch to char mode immediately executes string at prompt
Date: Wed, 23 Jun 2021 13:55:37 +0100 (BST)

One can switch from char-mode to line-mode via C-c C-j to copy text /
enter text etc. Unfortunately, when changing back to char-mode, it always sends a return to the shell.
This was not the case in emacs 26

For example, C-c C-j, then typing ls and then C-c C-k -> ls is
executed. However, If I type ls and then C-c C-j followed by C-c C-k, it does not execute ls

Bug affects emacs version 27 and 28

In GNU Emacs 28.0.50 (build 1, x86_64-apple-darwin20.5.0, NS appkit-2022.50 Version 11.4 (Build 20F71))
 of 2021-06-06 built on two.local
Windowing system distributor 'Apple', version 10.3.2022
System Description:  macOS 11.4

Configured using:
 'configure --disable-dependency-tracking --disable-silent-rules
 --enable-locallisppath=/usr/local/share/emacs/site-lisp
 --infodir=/usr/local/Cellar/emacs-plus <at> 28/28.0.50/share/info/emacs
 --prefix=/usr/local/Cellar/emacs-plus <at> 28/28.0.50 --with-xml2
 --with-gnutls --with-native-compilation --without-dbus
 --with-imagemagick --with-modules --with-rsvg --with-ns
 --disable-ns-self-contained 'CFLAGS=-I/usr/local/opt/gcc/include
 -I/usr/local/opt/libgccjit/include -I/usr/local/opt/gmp/include
 -I/usr/local/opt/jpeg/include' 'LDFLAGS=-L/usr/local/lib/gcc/11
 -I/usr/local/opt/gcc/include -I/usr/local/opt/libgccjit/include
 -I/usr/local/opt/gmp/include -I/usr/local/opt/jpeg/include''

Configured features:
ACL GIF GLIB GMP GNUTLS IMAGEMAGICK JPEG JSON LCMS2 LIBXML2 MODULES
NATIVE_COMP NOTIFY KQUEUE NS PDUMPER PNG RSVG THREADS TIFF
TOOLKIT_SCROLL_BARS XIM ZLIB

Important settings:
  value of $LANG: en_GB.UTF-8
  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:
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term/common-win tool-bar dnd fontset image regexp-opt fringe
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prog-mode register page tab-bar menu-bar rfn-eshadow isearch easymenu
timer select scroll-bar mouse jit-lock font-lock syntax font-core
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Memory information:
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 (symbols 48 6527 0)
 (strings 32 18707 1877)
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Message #8 received at 49186 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: 49186 <at> debbugs.gnu.org
Cc: simon254 <at> mailbox.org
Subject: Re: bug#49186: ansi-term switch to char mode immediately executes
 string at prompt
Date: Wed, 23 Jun 2021 15:21:01 +0200

simon254--- via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs <at> gnu.org> writes:

> For example, C-c C-j, then typing ls and then C-c C-k -> ls is
> executed. However, If I type ls and then C-c C-j followed by C-c C-k, it does not execute ls
>
> Bug affects emacs version 27 and 28

I can reproduce the behaviour.  To reproduce:

emacs -Q
M-x ansi-term RET RET
`C-c C-j l s C-c C-k'

In Emacs 26, this won't execute ls, but in Emacs 28 it does (and so it
does in Emacs 25.1).

The code for `term-char-mode' (i.e., `C-c C-k') seems to indicate that
the intention of the `C-c C-k' was to behave like Emacs 28 does now:

    ;; Send existing partial line to inferior (without newline).
    (let ((pmark (process-mark (get-buffer-process (current-buffer))))
	  (save-input-sender term-input-sender))
      (when (> (point) pmark)
	(unwind-protect
	    (progn
	      (setq term-input-sender
		    (symbol-function 'term-send-string))
	      (end-of-line)
	      (term-send-input))
	  (setq term-input-sender save-input-sender))))

But this didn't work in Emacs 26.1, but has been fixed now.

I don't use ansi-term myself much -- I think it's pretty peculiar that
`C-c C-k' sends partial line inputs to the shell.  Does anybody know
what the rationale for this is?  The code has been like this since 1994,
and Emacs 25 works like Emacs 28.  (So it's Emacs 26.1 that's broken
here.)

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #13 received at 49186 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: 49186 <at> debbugs.gnu.org
Cc: simon254 <at> mailbox.org
Subject: Re: bug#49186: ansi-term switch to char mode immediately executes
 string at prompt
Date: Thu, 22 Jul 2021 16:18:24 +0200

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> I don't use ansi-term myself much -- I think it's pretty peculiar that
> `C-c C-k' sends partial line inputs to the shell.  Does anybody know
> what the rationale for this is?  The code has been like this since 1994,
> and Emacs 25 works like Emacs 28.  (So it's Emacs 26.1 that's broken
> here.)

I've now made term-char-mode document what it does.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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