From b15821558707d732c88793cda52db392da19d198 Mon Sep 17 00:00:00 2001
From: Henrik Lissner <henrik@lissner.net>
Date: Thu, 15 Apr 2021 11:17:44 -0400
Subject: [PATCH] lang/java: fail meghanada-mode gracefully if java is absent

---
 modules/lang/java/+meghanada.el | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/modules/lang/java/+meghanada.el b/modules/lang/java/+meghanada.el
index cac7aff22..dd14aa72c 100644
--- a/modules/lang/java/+meghanada.el
+++ b/modules/lang/java/+meghanada.el
@@ -9,11 +9,20 @@
         meghanada-use-flycheck (featurep! :checkers syntax)
         meghanada-use-eldoc t
         meghanada-use-auto-start t)
+
   :config
   (set-lookup-handlers! 'java-mode
     :definition #'meghanada-jump-declaration
     :references #'meghanada-reference)
 
+  (defadvice! +java-meghanada-fail-gracefully-a (orig-fn &rest args)
+    "Toggle `meghanada-mode'. Fail gracefully if java is unavailable."
+    :around #'meghanada-mode
+    (if (executable-find meghanada-java-path)
+        (apply orig-fn args)
+      (message "Can't find %S binary. Is java installed? Aborting `meghanada-mode'."
+               meghanada-java-path)))
+
   (map! :localleader
         :map java-mode-map
         (:prefix ("r" . "refactor")