emacs-29 80e1037df44: Add string-interpolation feature to bash-ts-mode

[Yuan Fu]

branch: emacs-29
commit 80e1037df44c0b4607423d744a8b9b409a15efce
Author: Yuan Fu <casouri@gmail.com>
Commit: Yuan Fu <casouri@gmail.com>

    Add string-interpolation feature to bash-ts-mode
    
    * lisp/progmodes/sh-script.el:
    (bash-ts-mode): Add string-interpolation feature.
    (sh-mode--treesit-settings): Add rule for string-interpolation feature.
---
 lisp/progmodes/sh-script.el | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lisp/progmodes/sh-script.el b/lisp/progmodes/sh-script.el
index 4c06efc8146..29820049636 100644
--- a/lisp/progmodes/sh-script.el
+++ b/lisp/progmodes/sh-script.el
@@ -1619,7 +1619,8 @@ not written in Bash or sh."
     (setq-local treesit-font-lock-feature-list
                 '(( comment function)
                   ( command declaration-command keyword string)
-                  ( builtin-variable constant heredoc number variable)
+                  ( builtin-variable constant heredoc number
+                    string-interpolation variable)
                   ( bracket delimiter misc-punctuation operator)))
     (setq-local treesit-font-lock-settings
                 sh-mode--treesit-settings)
@@ -3289,6 +3290,12 @@ See `sh-mode--treesit-other-keywords' and
    :language 'bash
    '([(string) (raw_string)] @font-lock-string-face)
 
+   :feature 'string-interpolation
+   :language 'bash
+   :override t
+   '((command_substitution) @sh-quoted-exec
+     (string (expansion (variable_name) @font-lock-variable-name-face)))
+
    :feature 'heredoc
    :language 'bash
    '([(heredoc_start) (heredoc_body)] @sh-heredoc)