GNU bug report logs - #60280
29.0.60; c-ts-mode: Indent content on newline

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

From: Mohammed Sadiq <sadiq <at> sadiqpk.org>
To: Bug-gnu Emacs <bug-gnu-emacs <at> gnu.org>
Subject: 29.0.60; c-ts-mode: Indent content on newline
Date: Fri, 23 Dec 2022 23:31:23 +0530

The content doesn't seem to indent on newline after the user press
<Return> as in c-mode. And the user requires to press TAB explicitly
for this happen (and indentation happens only on non empty content).

Say for example, for the following code, if I press <Return> (| is the 
point)

if (success)|

I get:

if (success)
|

but I expect the following (with gnu style and 2 space indentation):

if (success)
  |


This is very much broken in do-while loops:

Say if I do:

do
{
}

and do TAB (after selecting the whole code), indentation doesn't happen
(with gnu style), but it seems to happen right once I complete writing
while(0); (or so). (Or is this a different bug?)



In GNU Emacs 29.0.60 (build 9, x86_64-pc-linux-gnu, GTK+ Version
 3.24.35, cairo version 1.16.0) of 2022-12-23 built on purism
Repository revision: 5a34e7c86ca1bfd5bc6ae362ae25c02d21ec0315
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 
11.0.12101004
System Description: Debian GNU/Linux bookworm/sid

Configured using:
 'configure --prefix=/usr'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
  value of $LANG: en_IN.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: C

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-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
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util text-property-search time-date subr-x mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils
cl-extra help-mode c-ts-mode treesit cl-seq vc-git diff-mode easy-mmode
vc-dispatcher cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles
cc-align cc-engine cc-vars cc-defs cl-loaddefs cl-lib rmc iso-transl
tooltip cconv eldoc paren electric uniquify ediff-hook vc-hooks
lisp-float-type elisp-mode mwheel term/x-win x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
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simple cl-generic indonesian philippine cham georgian utf-8-lang
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cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button
loaddefs theme-loaddefs faces cus-face macroexp files window
text-properties overlay sha1 md5 base64 format env code-pages mule
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inotify lcms2 dynamic-setting system-font-setting font-render-setting
cairo move-toolbar gtk x-toolkit xinput2 x multi-tty
make-network-process emacs)

Memory information:
((conses 16 65971 9097)
 (symbols 48 7799 0)
 (strings 32 22388 1358)
 (string-bytes 1 797300)
 (vectors 16 14070)
 (vector-slots 8 194957 11846)
 (floats 8 32 361)
 (intervals 56 259 0)
 (buffers 984 12))

Message #8 received at 60280 <at> debbugs.gnu.org (full text, mbox):

From: Yuan Fu <casouri <at> gmail.com>
To: sadiq <at> sadiqpk.org
Cc: 60280 <at> debbugs.gnu.org
Subject: Re: bug#60280: 29.0.60; c-ts-mode: Indent content on newline
Date: Sat, 24 Dec 2022 19:04:46 -0800

Mohammed Sadiq <sadiq <at> sadiqpk.org> writes:

> The content doesn't seem to indent on newline after the user press
> <Return> as in c-mode. And the user requires to press TAB explicitly
> for this happen (and indentation happens only on non empty content).
>
> Say for example, for the following code, if I press <Return> (| is the
> point)
>
> if (success)|
>
> I get:
>
> if (success)
> |
>
> but I expect the following (with gnu style and 2 space indentation):
>
> if (success)
>   |
>
>
> This is very much broken in do-while loops:
>
> Say if I do:
>
> do
> {
> }
>
> and do TAB (after selecting the whole code), indentation doesn't happen
> (with gnu style), but it seems to happen right once I complete writing
> while(0); (or so). (Or is this a different bug?)

This is because when you haven’t typed out the complete statement, the
parser couldn’t naturally don’t have the complete statement in the parse
tree, so the indent rules didn’t match. Once you completed the
statement, everything works as intended. We would need to add some
clever heuristics to match even when the parse tree is incomplete.

I’ll try to do it when I found some time, thought the priority would be
lower than other stuff.

Yuan

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