From c2ff0c5d8a9284e838913470ae2ddb76ba50fdb2 Mon Sep 17 00:00:00 2001
From: falkTX <falktx@falktx.com>
Date: Fri, 19 Aug 2022 00:39:50 +0100
Subject: [PATCH] Show alert window on macOS when standalone fails to start

---
 distrho/src/DistrhoPluginJACK.cpp | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/distrho/src/DistrhoPluginJACK.cpp b/distrho/src/DistrhoPluginJACK.cpp
index 35701827..f5ef2336 100644
--- a/distrho/src/DistrhoPluginJACK.cpp
+++ b/distrho/src/DistrhoPluginJACK.cpp
@@ -38,6 +38,12 @@
 #include "jackbridge/JackBridge.cpp"
 #include "lv2/lv2.h"
 
+#ifdef DISTRHO_OS_MAC
+# define Point CocoaPoint
+# include <CoreFoundation/CoreFoundation.h>
+# undef Point
+#endif
+
 #ifndef DISTRHO_OS_WINDOWS
 # include <signal.h>
 # include <unistd.h>
@@ -982,7 +988,17 @@ int main(int argc, char* argv[])
         else
             d_stderr("Failed to create the JACK client, cannot continue!");
 
-       #if defined(DISTRHO_OS_WINDOWS) && DISTRHO_PLUGIN_HAS_UI
+       #if defined(DISTRHO_OS_MAC)
+        CFStringRef errorTitleRef = CFStringCreateWithCString(nullptr,
+           DISTRHO_PLUGIN_NAME ": Error", kCFStringEncodingUTF8);
+        CFStringRef errorStringRef = CFStringCreateWithCString(nullptr,
+           String("Failed to create JACK client, reason was:\n" + errorString).buffer(), kCFStringEncodingUTF8);
+
+        CFUserNotificationDisplayAlert(0, kCFUserNotificationCautionAlertLevel,
+           nullptr, nullptr, nullptr,
+           errorTitleRef, errorStringRef,
+           nullptr, nullptr, nullptr, nullptr);
+       #elif defined(DISTRHO_OS_WINDOWS) && DISTRHO_PLUGIN_HAS_UI
         // make sure message box is high-dpi aware
         if (const HMODULE user32 = LoadLibrary("user32.dll"))
         {