emacs-29 dda4baa58b7: ; Fix build and startup without tree-sitter

[Eli Zaretskii]

branch: emacs-29
commit dda4baa58b7e6a5c70f4c40c80463221b3c479c1
Author: Eli Zaretskii <eliz@gnu.org>
Commit: Eli Zaretskii <eliz@gnu.org>

    ; Fix build and startup without tree-sitter
    
    * lisp/treesit.el (treesit--font-lock-level-setter): Don't loop
    over all the buffers if tree-sitter is not built-in, or else
    initialization of defcustom will fail.  (Bug#61155)
    * lisp/progmodes/rust-ts-mode.el (treesit-node-parent):
    * lisp/progmodes/c-ts-common.el (treesit-node-parent): Declare, to
    * avoid byte-compilation warnings.
---
 lisp/progmodes/c-ts-common.el  |  1 +
 lisp/progmodes/rust-ts-mode.el |  1 +
 lisp/treesit.el                | 31 +++++++++++++++++--------------
 3 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/lisp/progmodes/c-ts-common.el b/lisp/progmodes/c-ts-common.el
index 2d4a0d41c2a..c13b01aae5c 100644
--- a/lisp/progmodes/c-ts-common.el
+++ b/lisp/progmodes/c-ts-common.el
@@ -50,6 +50,7 @@
 (declare-function treesit-node-start "treesit.c")
 (declare-function treesit-node-end "treesit.c")
 (declare-function treesit-node-type "treesit.c")
+(declare-function treesit-node-parent "treesit.c")
 
 ;;; Comment indentation and filling
 
diff --git a/lisp/progmodes/rust-ts-mode.el b/lisp/progmodes/rust-ts-mode.el
index 2812e39c101..e317793d211 100644
--- a/lisp/progmodes/rust-ts-mode.el
+++ b/lisp/progmodes/rust-ts-mode.el
@@ -37,6 +37,7 @@
 (declare-function treesit-node-child-by-field-name "treesit.c")
 (declare-function treesit-node-start "treesit.c")
 (declare-function treesit-node-type "treesit.c")
+(declare-function treesit-node-parent "treesit.c")
 
 (defcustom rust-ts-mode-indent-offset 4
   "Number of spaces for each indentation step in `rust-ts-mode'."
diff --git a/lisp/treesit.el b/lisp/treesit.el
index 92833fb007c..98f446a1456 100644
--- a/lisp/treesit.el
+++ b/lisp/treesit.el
@@ -87,6 +87,7 @@
 (declare-function treesit-search-subtree "treesit.c")
 (declare-function treesit-search-forward "treesit.c")
 (declare-function treesit-induce-sparse-tree "treesit.c")
+(declare-function treesit-subtree-stat "treesit.c")
 
 (declare-function treesit-available-p "treesit.c")
 
@@ -557,20 +558,22 @@ omitted, default END to BEG."
 (defun treesit--font-lock-level-setter (sym val)
   "Custom setter for `treesit-font-lock-level'."
   (set-default sym val)
-  (named-let loop ((res nil)
-                   (buffers (buffer-list)))
-    (if (null buffers)
-        (mapc (lambda (b)
-                (with-current-buffer b
-                  (setq-local treesit-font-lock-level val)
-                  (treesit-font-lock-recompute-features)
-                  (treesit-font-lock-fontify-region (point-min) (point-max))))
-              res)
-      (let ((buffer (car buffers)))
-        (with-current-buffer buffer
-          (if (treesit-parser-list)
-              (loop (append res (list buffer)) (cdr buffers))
-            (loop res (cdr buffers))))))))
+  (and (treesit-available-p)
+       (named-let loop ((res nil)
+                        (buffers (buffer-list)))
+         (if (null buffers)
+             (mapc (lambda (b)
+                     (with-current-buffer b
+                       (setq-local treesit-font-lock-level val)
+                       (treesit-font-lock-recompute-features)
+                       (treesit-font-lock-fontify-region (point-min)
+                                                         (point-max))))
+                   res)
+           (let ((buffer (car buffers)))
+             (with-current-buffer buffer
+               (if (treesit-parser-list)
+                   (loop (append res (list buffer)) (cdr buffers))
+                 (loop res (cdr buffers)))))))))
 
 (defcustom treesit-font-lock-level 3
   "Decoration level to be used by tree-sitter fontifications.