Fix indentation test failure for elixir-ts--indent-rules

* lisp/progmodes/elixir-ts-mode.el (elixir-ts--indent-rules):
Add query for Elixir embedded in Heex (bug#76788).

* lisp/progmodes/heex-ts-mode.el (heex-ts-mode): Append
treesit-simple-indent-rules to elixir-ts--indent-rules.

2 files changed, 20 insertions, 1 deletions

diff --git a/lisp/progmodes/elixir-ts-mode.el b/lisp/progmodes/elixir-ts-mode.el
index 3a136894454..f7d6932c7c2 100644
--- a/lisp/progmodes/elixir-ts-mode.el
+++ b/lisp/progmodes/elixir-ts-mode.el
@@ -244,7 +244,21 @@
 (defvar elixir-ts--indent-rules
   (let ((offset elixir-ts-indent-offset))
     `((elixir
-       ((parent-is "^source$") column-0 0)
+       ((parent-is "^source$")
+        ,(lambda (_node _parent bol &rest _)
+           ;; If Elixir is embedded indent to parent
+           ;; otherwise indent to the bol.
+           (if (treesit-local-parsers-at (point))
+               (save-excursion
+                 (goto-char (treesit-node-start
+                             (treesit-node-at bol 'heex)))
+                 (back-to-indentation)
+                 (point))
+             (pos-bol)))
+        ,(lambda (_node _parent _bol &rest _)
+           (if (treesit-local-parsers-at (point))
+               elixir-ts-indent-offset
+             0)))
        ((parent-is "^string$") parent-bol 0)
        ((parent-is "^quoted_content$")
         (lambda (_n parent bol &rest _)
diff --git a/lisp/progmodes/heex-ts-mode.el b/lisp/progmodes/heex-ts-mode.el
index a5fc6e2e232..2d6dce784bc 100644
--- a/lisp/progmodes/heex-ts-mode.el
+++ b/lisp/progmodes/heex-ts-mode.el
@@ -188,6 +188,7 @@ Return nil if NODE is not a defun node or doesn't have a name."
 
 (defvar elixir-ts--font-lock-settings)
 (defvar elixir-ts--font-lock-feature-list)
+(defvar elixir-ts--indent-rules)
 (defvar elixir-ts--thing-settings)
 
 ;;;###autoload
@@ -244,6 +245,10 @@ Return nil if NODE is not a defun node or doesn't have a name."
                    treesit-font-lock-feature-list
                    elixir-ts--font-lock-feature-list))
 
+      (setq-local treesit-simple-indent-rules
+                  (append treesit-simple-indent-rules
+                          elixir-ts--indent-rules))
+
       (setq-local treesit-thing-settings
                   (append treesit-thing-settings
                           `((elixir ,@elixir-ts--thing-settings)))))