bug#74277: 29.4; rust-ts-mode doesn't highlight some function calls

bug#74277: 29.4; rust-ts-mode doesn't highlight some function calls

[acidbong--- via Bug reports for GNU Emacs, the Swiss army knife of text editors]

rust-ts-mode highlights function calls when they're used in an
assignment or as statements, but not in string formatting:


```
println!("Some line and {}", some_function(a, b))
                           # ^^^^^^^^^^^^^ this is not getting highlighted
```

This is how it looks in Emacs (treesit-level is 4 btw):
https://matrix.envs.net/_matrix/media/r0/download/envs.net/66652827fc7545e57d2eef263ee28ef6bc2ef1c01854976160883015680

This is how it looks in Neovim (with treesitter highlighting on):
https://matrix.envs.net/_matrix/media/r0/download/envs.net/382a104ee3e6e4dacabebfa7f84f4b9b7231b1171854976151936565248

-----------------------------------

In GNU Emacs 29.4 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
version 1.18.2, Xaw3d scroll bars)
Windowing system distributor 'The X.Org Foundation', version 11.0.12101013
System Description: NixOS 24.11 (Vicuna)

Configured using:
 'configure
 --prefix=/nix/store/fsglyaxfhlavaskr159b4yyjlajy4qq5-emacs-29.4
 --disable-build-details --with-modules --with-x-toolkit=lucid
 --with-cairo --with-xft --with-compress-install
 --with-toolkit-scroll-bars --with-native-compilation
 --without-imagemagick --with-mailutils --without-small-ja-dic
 --with-tree-sitter --with-xinput2 --without-xwidgets --with-dbus
 --with-selinux'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XAW3D XDBE XIM XINPUT2 XPM
LUCID ZLIB

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

Major mode: Rust

Minor modes in effect:
  consult-eglot-embark-mode: t
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  font-lock-mode: t
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  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/nix/store/qm7zdj12cb53nm3lvyh7pmf9kzfbz613-emacs-packages-deps/share/emacs/site-lisp/site-start hides /nix/store/fsglyaxfhlavaskr159b4yyjlajy4qq5-emacs-29.4/share/emacs/site-lisp/site-start
/nix/store/qm7zdj12cb53nm3lvyh7pmf9kzfbz613-emacs-packages-deps/share/emacs/site-lisp/elpa/transient-20241104.2211/transient hides /nix/store/fsglyaxfhlavaskr159b4yyjlajy4qq5-emacs-29.4/share/emacs/29.4/lisp/transient
/nix/store/qm7zdj12cb53nm3lvyh7pmf9kzfbz613-emacs-packages-deps/share/emacs/site-lisp/elpa/seq-2.24/seq hides /nix/store/fsglyaxfhlavaskr159b4yyjlajy4qq5-emacs-29.4/share/emacs/29.4/lisp/emacs-lisp/seq

Features:
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mm-bodies mm-encode epg-config mail-utils gnutls network-stream
url-cache url-http url-auth mail-parse rfc2231 rfc2047 rfc2045 mm-util
ietf-drums mail-prsvr url-gw nsm puny cus-edit cus-start cus-load
descr-text embark-consult consult bookmark eglot external-completion
jsonrpc ert debug backtrace xref flymake-proc flymake imenu vc-git
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bug#74277: 29.4; rust-ts-mode doesn't highlight some function calls

[Eli Zaretskii]

> Date: Fri, 08 Nov 2024 20:24:07 +0000
> From: acidbong--- via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> rust-ts-mode highlights function calls when they're used in an
> assignment or as statements, but not in string formatting:
> 
> 
> ```
> println!("Some line and {}", some_function(a, b))
>                            # ^^^^^^^^^^^^^ this is not getting highlighted
> ```
> 
> This is how it looks in Emacs (treesit-level is 4 btw):
> https://matrix.envs.net/_matrix/media/r0/download/envs.net/66652827fc7545e57d2eef263ee28ef6bc2ef1c01854976160883015680
> 
> This is how it looks in Neovim (with treesitter highlighting on):
> https://matrix.envs.net/_matrix/media/r0/download/envs.net/382a104ee3e6e4dacabebfa7f84f4b9b7231b1171854976151936565248
> 
> -----------------------------------

Thanks.

Randy/Yuan, any suggestions or fixes?

bug#74277: 29.4; rust-ts-mode doesn't highlight some function calls

[Randy Taylor]

On Saturday, November 9th, 2024 at 03:52, Eli Zaretskii <eliz@gnu.org> wrote:

> 
> 
> > Date: Fri, 08 Nov 2024 20:24:07 +0000
> 
> > From: acidbong--- via "Bug reports for GNU Emacs,
> > the Swiss army knife of text editors" bug-gnu-emacs@gnu.org
> > 
> > rust-ts-mode highlights function calls when they're used in an
> > assignment or as statements, but not in string formatting:
> > 
> > `println!("Some line and {}", some_function(a, b)) # ^^^^^^^^^^^^^ this is not getting highlighted`
> > 
> > This is how it looks in Emacs (treesit-level is 4 btw):
> > https://matrix.envs.net/_matrix/media/r0/download/envs.net/66652827fc7545e57d2eef263ee28ef6bc2ef1c01854976160883015680
> > 
> > This is how it looks in Neovim (with treesitter highlighting on):
> > https://matrix.envs.net/_matrix/media/r0/download/envs.net/382a104ee3e6e4dacabebfa7f84f4b9b7231b1171854976151936565248
> > 
> > -----------------------------------
> 
> 
> Thanks.
> 
> Randy/Yuan, any suggestions or fixes?

This was discussed briefly awhile back, but it's basically going to
require special handling because macro invocations don't give us the
usual dead simple way of doing it.

Maybe it's easy enough to see if the identifier has parentheses
immediately following it...

I probably won't have a chance to take a crack at it anytime soon, so
if anyone wants to beat me to it, feel free.

bug#74277: 29.4; rust-ts-mode doesn't highlight some function calls

[Trevor Arjeski]

Randy Taylor <dev@rjt.dev> writes:

Hi all, randomly started looking into this...

> This was discussed briefly awhile back, but it's basically going to
> require special handling because macro invocations don't give us the
> usual dead simple way of doing it.

Is this due to lack of support for injections.scm in Emacs' treesitter
implementation?
http://tree-sitter.github.io/tree-sitter/syntax-highlighting#language-injection

Can't seem to find any traces of that in the current source.

From inspecting this line of code in Neovim, it appears that the
injection on macro_invocation is what forces parsing the macro params as
another source_file.

bug#74277: 29.4; rust-ts-mode doesn't highlight some function calls

[Acid Bong via Bug reports for GNU Emacs, the Swiss army knife of text editors]

>Is this due to lack of support for injections.scm in Emacs' treesitter
>implementation?

This starts making sense for me: I guess that's why nix-ts-mode can't process its Bash injections.

Looks like not using injections is the real issue here.

bug#74277: 29.4; rust-ts-mode doesn't highlight some function calls

[Trevor Arjeski]

[-- Attachment #1: Type: text/plain, Size: 154 bytes --]

Trevor Arjeski <tmarjeski@gmail.com> writes:

I decided to hack around with this a little bit and found that adding
the following lines partially works:


[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: rudamentary fix --]
[-- Type: text/x-patch, Size: 799 bytes --]

diff --git a/lisp/progmodes/rust-ts-mode.el b/lisp/progmodes/rust-ts-mode.el
index e52ea3b125a..508a53d9e32 100644
--- a/lisp/progmodes/rust-ts-mode.el
+++ b/lisp/progmodes/rust-ts-mode.el
@@ -517,6 +517,19 @@ rust-ts-mode
     (setq-local syntax-propertize-function
                 #'rust-ts-mode--syntax-propertize)
 
+    ;; Injected languages
+    ;; TODO: add json?
+    (setq-local treesit-range-settings
+                (treesit-range-rules
+                 :embed 'rust
+                 :host 'rust
+                 :local t
+                 '((macro_invocation
+                    (token_tree) @capture))))
+
+    ;; TODO: set this to a useful function
+    (setq-local treesit-language-at-point-function (lambda (_pos) 'rust))
+
     ;; Comments.
     (c-ts-common-comment-setup)
 

[-- Attachment #3: Type: text/plain, Size: 424 bytes --]


I'm sure there is an issue with solving it this way, I just need someone
else more experienced to confirm. It is finicky where it turns the
highlighting on and off when you make some code changes, for example
adding and removing the semi-colon after the macro invocation.

Here is some example code to test it against:

   fn foo() -> i32 {
       4
   }
   
   fn main() {
       println!("{:?}", foo());
   }
   

Thanks