GNU bug report logs - #66159
30.0.50; lua-ts-mode semantic indentation problems

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Andrey Listopadov <andreyorst <at> gmail.com>
Subject: bug#66159: closed (Re: bug#66159: [PATCH] Various improvements to
 lua-ts-mode (Bug#66159))
Date: Mon, 23 Oct 2023 08:13:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#66159: 30.0.50; lua-ts-mode semantic indentation problems

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 66159 <at> debbugs.gnu.org.

-- 
66159: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=66159
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Stefan Kangas <stefankangas <at> gmail.com>
To: john muhl <jm <at> pub.pink>
Cc: 66159-done <at> debbugs.gnu.org, Andrey Listopadov <andreyorst <at> gmail.com>,
 Mauro Aranda <maurooaranda <at> gmail.com>
Subject: Re: bug#66159: [PATCH] Various improvements to lua-ts-mode (Bug#66159)
Date: Mon, 23 Oct 2023 01:11:57 -0700

Version: 30.1

john muhl <jm <at> pub.pink> writes:

> It should be ok to install.

Thanks, installed on master.  I'm consequently closing this bug.

[1: 1c261e0a6ca]: 2023-10-23 10:07:52 +0200
  Various improvements to lua-ts-mode (Bug#66159)
  https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=1c261e0a6cae09e3ff36930442f2c9da44bccd6d

[Message part 3 (message/rfc822, inline)]

From: Andrey Listopadov <andreyorst <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.0.50; lua-ts-mode semantic indentation problems
Date: Fri, 22 Sep 2023 22:17:55 +0300

I've been editing Lua using the long-existing lua-mode[1] and it works
well enough for me, but it's indentation implementation is very slow.
Indenting a file with just 600 lines takes several seconds on my
machine.  So when I saw that Emacs now features a lua-ts-mode package in
its core, I tried to move to it, in hopes that it would be faster.

However, a lot of code is now indented differently, not how I used to,
and this creates a lot of noise in commits, as I often re-indent the
whole buffer before saving the file. Here are some examples.

lua-mode:

function foo (e)
    if e == nil
    then return 1000
    else return e
end end

lua-ts-mode:

function foo (e)
    if e == nil
        then return 1000
    else return e
    end end

My thoughts:

`then' is indented as the part of the block of code that is part of the
`true' branch itself. In lua-mode, it is indented the same as `if' itself,
and everything after `then' is indented if moved to a new line:

function foo (e)
    if e == nil
    then
        return 1000
    else
        return e
end end

In lua-ts-mode it is indented together with the body which isn't
idiomatic:

function foo (e)
    if e == nil
        then
        return 1000
    else
        return e
    end end

Another thing that bothers me is that I prefer Gassanenko-style packing
of `end' keywords so that they vertically align with the scope of the
opened block, as it saves so much vertical space and is easier for me to
read, but lua-ts-mode moves it to the latest innermost indentation
level, as opposed to the outermost depending on the count of ends in the
line itself:

function lowest_entropy_cell(world)
|   local lowest,res=math.huge,nil
|   for y=1,world.height do
|   |   for x=1,world.width do
|   |   |   local cell=world:get(x,y)
|   |   |   if cell.is_set then
|   |   |   |   local e=cell_enthropy(cell)
|   |   |   |   trace(e)
|   |   |   |   if e <= lowest then
|   |   |   |   |   lowest,res=e,{x,y}
|   end end end end
|   return res or {math.random(world.width),math.random(world.height)}
end

However, lua-ts-mode indents it like so:

function lowest_entropy_cell(world)
    local lowest,res=math.huge,nil
    for y=1,world.height do
        for x=1,world.width do
            local cell=world:get(x,y)
            if cell.is_set then
                local e=cell_enthropy(cell)
                trace(e)
                if e <= lowest then
                    lowest,res=e,{x,y}
                end end end end
    return res or {math.random(world.width),math.random(world.height)}
end

I noticed the difference in table indentations as well.

lua-mode:

local Recipe = {
    Floor={up={Floor=true,Wall=true},
           down={Floor=true,Wall=true},
           left={Floor=true,Wall=true},
           right={Floor=true,Wall=true}},
    Wall={up={Floor=true,Wall=true},
          down={Floor=true,Wall=true},
          left={Floor=true,Wall=true},
          right={Floor=true,Wall=true}},
    Corridor={up={Corridoor=true},
              down={Corridoor=true},
              left={Corridoor=true},
              right={Corridoor=true}}
}

lua-ts-mode:

local Recipe = {
    Floor={up={Floor=true,Wall=true},
        down={Floor=true,Wall=true},
        left={Floor=true,Wall=true},
        right={Floor=true,Wall=true}},
    Wall={up={Floor=true,Wall=true},
        down={Floor=true,Wall=true},
        left={Floor=true,Wall=true},
        right={Floor=true,Wall=true}},
    Corridor={up={Corridoor=true},
        down={Corridoor=true},
        left={Corridoor=true},
        right={Corridoor=true}}
}

The first one is more logical and obeys scope levels.

Should I expect this to be the default new way of indenting or the
indentation can be made to match the lua-mode where it is sensible?

Thanks!

P.S. I know that stacking `end' isn't really idiomatic Lua style, but it
works in old-lua mode sensible enough that it is actually surprising,
and transforms Lua into code that is easy to parse just by looking on
the indentation level, much like Lisps.

[1] https://github.com/immerrr/lua-mode


In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.38, cairo version 1.17.8) of 2023-09-18 built on toolbox
Repository revision: 861f9cb78370e2b78f852e5ccde9b63c94486ca8
Repository branch: master
System Description: Fedora Linux 38 (Container Image)

Configured using:
 'configure --without-compress-install --with-native-compilation=aot
 --with-pgtk --with-mailutils --with-xwidgets
 --prefix=/var/home/alist/.local'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY
PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER XIM XWIDGETS GTK3 ZLIB

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

Major mode: Lua

Minor modes in effect:
  repeat-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  electric-pair-mode: t
  hl-todo-mode: t
  savehist-mode: t
  delete-selection-mode: t
  pixel-scroll-precision-mode: t
  global-auto-revert-mode: t
  corfu-popupinfo-mode: t
  global-corfu-mode: t
  corfu-mode: t
  global-region-bindings-mode: t
  recentf-mode: t
  gcmh-mode: t
  server-mode: t
  marginalia-mode: t
  vertico-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  context-menu-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  minibuffer-regexp-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  abbrev-mode: t
  hs-minor-mode: t

Load-path shadows:
/var/home/alist/.config/emacs/elpa/transient-20230915.1911/transient hides /var/home/alist/.local/share/emacs/30.0.50/lisp/transient
/var/home/alist/.config/emacs/elpa/modus-themes-20230916.905/theme-loaddefs hides /var/home/alist/.local/share/emacs/30.0.50/lisp/theme-loaddefs

Features:
(shadow emacsbug dabbrev lua-ts-mode rect lua-mode modus-operandi-theme
python geiser-mode geiser-xref geiser-compile geiser-guile tramp
trampver tramp-integration tramp-message tramp-compat tramp-loaddefs
info-look geiser geiser-debug geiser-repl geiser-image geiser-capf
geiser-doc geiser-menu geiser-autodoc geiser-edit etags fileloop
geiser-completion geiser-eval geiser-connection tq geiser-syntax
geiser-log geiser-popup geiser-impl help-fns radix-tree geiser-custom
geiser-base scheme find-dired grep display-line-numbers css-mode treesit
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mu4e-org mu4e-main mu4e-view mu4e-headers mu4e-compose mu4e-draft
mu4e-actions smtpmail mu4e-search mu4e-lists mu4e-bookmarks mu4e-mark
mu4e-message flow-fill hl-line mu4e-contacts mu4e-update mu4e-folders
mu4e-server mu4e-context mu4e-vars mu4e-helpers mu4e-config ido tabify
cus-start repeat files-x org-archive puni pulse color consult 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-icalendar org-agenda ox-ascii
ox-latex ox-hugo ox-hugo-deprecated ffap ox-blackfriday ox-md ox-html
table ox-publish tomelr ox sgml-mode facemenu xwidget magit-bookmark
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magit-remote magit-commit magit-sequence magit-notes magit-worktree
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url-proxy url-privacy url-expand url-methods url-history url-cookie
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auth-source cl-seq eieio eieio-core cl-macs password-cache json subr-x
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timer select scroll-bar mouse jit-lock font-lock syntax font-core
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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 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 custom widget keymap
hashtable-print-readable backquote threads xwidget-internal dbusbind
inotify dynamic-setting system-font-setting font-render-setting cairo
gtk pgtk lcms2 multi-tty move-toolbar make-network-process
native-compile emacs)

Memory information:
((conses 16 1147781 1425356) (symbols 48 52742 50)
 (strings 32 272573 78657) (string-bytes 1 9908365)
 (vectors 16 119200) (vector-slots 8 2827929 951125)
 (floats 8 888 21739) (intervals 56 40788 17575) (buffers 992 46))

-- 
Andrey Listopadov

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