catching openURL() issues on macOS

app/src/processing/app/platform/MacPlatform.java

@@ -22,9 +22,11 @@
 
 package processing.app.platform;
 
+import java.awt.Desktop;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.net.URI;
 
 import com.apple.eio.FileManager;
 
@@ -62,6 +64,7 @@ public class MacPlatform extends DefaultPlatform {
     }
   }
 
+
   public void initBase(Base base) {
     super.initBase(base);
     System.setProperty("apple.laf.useScreenMenuBar", "true");
@@ -127,6 +130,21 @@ public class MacPlatform extends DefaultPlatform {
 //  }
 
 
+  public void openURL(String url) throws Exception {
+    try {
+      Desktop.getDesktop().browse(new URI(url));
+    } catch (IOException e) {
+      // Deal with a situation where the browser hangs on macOS
+      // https://github.com/fathominfo/processing-p5js-mode/issues/4
+      if (e.getMessage().contains("Error code: -600")) {
+        throw new RuntimeException("Could not open the sketch, please restart your browser or computer");
+      } else {
+        throw e;
+      }
+    }
+  }
+
+
   /*
   public void openURL(String url) throws Exception {
     if (PApplet.javaVersion < 1.6f) {

app/src/processing/app/ui/Editor.java

@@ -2579,6 +2579,7 @@ public abstract class Editor extends JFrame implements RunnerListener {
     Preferences.save();
   }
 
+
   /**
    * Set the title of the PDE window based on the current sketch, i.e.
    * something like "sketch_070752a - Processing 0126"