fix: backport treesit-available-p sooner

This fixes Doom for Emacs 27-28 users (or builds without treesit).

lisp/doom-compat.el

@@ -132,6 +132,25 @@ The functions in the hook are called with one parameter -- the
       (funcall fn theme)
       (run-hook-with-args 'enable-theme-functions theme))))
 
+;; Introduced in 29.1
+;; In case of Emacs builds where treesit isn't built in (to avoid void-function
+;; errors and verbose, redundant checks everywhere).
+;;;###autodef
+(unless (fboundp 'treesit-available-p)
+  (defun treesit-available-p ()
+    "Return non-nil if tree-sitter support is built-in and available."
+    nil))
+
+;;;###autoload
+(unless (fboundp 'treesit-library-abi-version)
+  (defun treesit-library-abi-version (&optional _min-compatible)
+    0))
+
+;;;###autoload
+(unless (fboundp 'treesit-language-abi-version)
+  (defun treesit-language-abi-version (&optional _lang)
+    nil))
+
 
 ;;; From Emacs >= 30
 ;; Introduced in 30.1

modules/tools/tree-sitter/autoload/compat-30.el

@@ -1,5 +1,5 @@
 ;;; tools/tree-sitter/autoload/compat-30.el -*- lexical-binding: t; -*-
-;;;###if (and (fboundp 'treesit-available-p) (version< emacs-version "31.1"))
+;;;###if (and (treesit-available-p) (version< emacs-version "31.1"))
 ;;
 ;; Backported from 31.1
 ;;
@@ -7,24 +7,6 @@
 
 (autoload 'treesit-ready-p "treesit")
 
-;; In case of Emacs builds where treesit isn't built in (to avoid void-function
-;; errors and verbose, redundant checks everywhere).
-;;;###autodef
-(unless (fboundp 'treesit-available-p)
-  (defun treesit-available-p ()
-    "Return non-nil if tree-sitter support is built-in and available."
-    nil))
-
-;;;###autoload
-(unless (fboundp 'treesit-library-abi-version)
-  (defun treesit-library-abi-version (&optional _min-compatible)
-    0))
-
-;;;###autoload
-(unless (fboundp 'treesit-language-abi-version)
-  (defun treesit-language-abi-version (&optional _lang)
-    nil))
-
 ;;;###autoload
 (defcustom treesit-auto-install-grammar 'ask
   "Whether to install tree-sitter language grammar libraries when needed.

modules/tools/tree-sitter/config.el

@@ -4,7 +4,6 @@
 ;;; Packages
 
 (use-package! treesit
-  :when (fboundp 'treesit-available-p)
   :when (treesit-available-p)
   :defer t
   :preface
@@ -48,8 +47,7 @@
     (let ((mode (funcall fn mode)))
       (if-let* ((ts (get mode '+tree-sitter))
                 (fallback-mode (car ts)))
-          (cond ((or (not (fboundp 'treesit-available-p))
-                     (not (treesit-available-p)))
+          (cond ((not (treesit-available-p))
                  (message "Treesit unavailable, falling back to `%S'" fallback-mode)
                  fallback-mode)
                 ((not (fboundp mode))

modules/tools/tree-sitter/doctor.el

@@ -5,6 +5,5 @@
 
 (if (version< emacs-version "29.1")
     (error! "Emacs 29.1 or newer is required for tree-sitter support")
-  (unless (and (fboundp 'treesit-available-p)
-               (treesit-available-p))
+  (unless (treesit-available-p)
     (error! "Emacs not built with tree-sitter support!")))