invoke Dash.app without resigning focus

resolves #41

src/de/dreamlab/dash/launcher/AbstractLauncher.java

@@ -8,11 +8,14 @@ public abstract class AbstractLauncher {
 
     public static AbstractLauncher createInstance()
     {
-        if ( SystemUtil.isIsOSLinux() ) {
+        if ( SystemUtil.isIsOSMac() ) {
+            return new DashLauncher();
+        }
+        else if ( SystemUtil.isIsOSLinux() ) {
             return new ZealLauncher();
         }
         else {
-            return new DashSchemeLauncher();
+            return new DashPluginSchemeLauncher();
         }
     }
 

src/de/dreamlab/dash/launcher/DashLauncher.java

@@ -0,0 +1,56 @@
+/**
+ * Created by gerard on 12.04.15.
+ */
+
+package de.dreamlab.dash.launcher;
+
+import com.intellij.execution.ExecutionException;
+import com.intellij.execution.configurations.GeneralCommandLine;
+import com.intellij.notification.Notification;
+import com.intellij.notification.NotificationType;
+import com.intellij.notification.Notifications;
+
+import java.awt.*;
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URLEncoder;
+import java.util.List;
+
+public class DashLauncher extends AbstractLauncher {
+
+    public void search(List<String> keywords, String query)
+    {
+        try {
+            String request = "dash-plugin://";
+
+            // keywords
+            if ( keywords.size() > 0 ) {
+                request += "keys=" + keywordString(keywords) + "&";
+            }
+
+            // query
+            request += "query=" + urlEncode(query);
+
+            openUri(request);
+        }
+        catch ( Throwable e ) {
+            Notifications.Bus.notify(new Notification("Dash Plugin Error", "Dash Plugin Error", e.getMessage(), NotificationType.ERROR));
+        }
+    }
+
+    private void openUri(String uriStr) throws ExecutionException
+    {
+        final GeneralCommandLine commandLine = new GeneralCommandLine("open");
+        commandLine.addParameter("-g");
+        commandLine.addParameter(uriStr);
+        commandLine.createProcess();
+    }
+
+    private String urlEncode(String s) throws UnsupportedEncodingException
+    {
+        return URLEncoder.encode(s, "UTF-8").replace("+", "%20");
+    }
+
+}

src/de/dreamlab/dash/launcher/DashSchemeLauncher.java → src/de/dreamlab/dash/launcher/DashPluginSchemeLauncher.java

@@ -16,9 +16,9 @@
 import java.net.URLEncoder;
 import java.util.List;
 
-public class DashSchemeLauncher extends AbstractLauncher {
+public class DashPluginSchemeLauncher extends AbstractLauncher {
 
-    public DashSchemeLauncher() {
+    public DashPluginSchemeLauncher() {
     }
 
     public void search(List<String> keywords, String query)