From 35def2831acd67ace6943e06f502a356529c3357 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Fri, 27 Mar 2026 13:11:19 +0200
Subject: Auto-open CLI simulation files on startup

---
 src/main/java/simulator/VSMain.java           | 25 ++++++++++++++++++++++---
 src/main/java/simulator/VSSimulatorFrame.java | 21 +++++++++++++++++++++
 2 files changed, 43 insertions(+), 3 deletions(-)

(limited to 'src/main/java/simulator')

diff --git a/src/main/java/simulator/VSMain.java b/src/main/java/simulator/VSMain.java
index 02f3e20..5718b72 100644
--- a/src/main/java/simulator/VSMain.java
+++ b/src/main/java/simulator/VSMain.java
@@ -50,6 +50,21 @@ public class VSMain {
         new VSSimulatorFrame(prefs, relativeTo);
     }
 
+    /**
+     * Resolves the initial simulation filename from the CLI arguments.
+     *
+     * @param args the arguments passed to main
+     *
+     * @return the first non-blank argument, or null if none was provided
+     */
+    static String resolveStartupSimulationFile(String[] args) {
+        if (args == null || args.length == 0 || args[0] == null)
+            return null;
+
+        String filename = args[0].trim();
+        return filename.isEmpty() ? null : filename;
+    }
+
     /**
      * The main method.
      *
@@ -69,14 +84,18 @@ public class VSMain {
         javax.swing.JPopupMenu.setDefaultLightWeightPopupEnabled(false);
         VSPrefs prefs = VSDefaultPrefs.init();
         VSRegisteredEvents.init(prefs);
-        
+        VSMain.prefs = prefs;
+
         // Wait for splash screen to finish before showing main window
         try {
             Thread.sleep(3000);
         } catch (InterruptedException e) {
             Thread.currentThread().interrupt();
         }
-        
-        new VSMain(prefs);
+
+        VSSimulatorFrame simulatorFrame = new VSSimulatorFrame(prefs, null);
+        String startupSimulationFile = resolveStartupSimulationFile(args);
+        if (startupSimulationFile != null)
+            simulatorFrame.openAndStartSimulator(startupSimulationFile);
     }
 }
diff --git a/src/main/java/simulator/VSSimulatorFrame.java b/src/main/java/simulator/VSSimulatorFrame.java
index 3cf4e91..818bea9 100644
--- a/src/main/java/simulator/VSSimulatorFrame.java
+++ b/src/main/java/simulator/VSSimulatorFrame.java
@@ -504,6 +504,7 @@ public class VSSimulatorFrame extends VSFrame {
         tabbedPane.addTab(prefs.getString("lang.simulator")
                           + " " + simulator.getSimulatorNum(), simulator);
         tabbedPane.setSelectedComponent(simulator);
+        currentSimulator = simulator;
 
         if (simulators.size() == 1) {
             menuEdit.setEnabled(true);
@@ -576,6 +577,9 @@ public class VSSimulatorFrame extends VSFrame {
      * Starts the current simulator
      */
     public void startCurrentSimulator() {
+        if (currentSimulator == null)
+            return;
+
         VSMenuItemStates menuItemState =
             currentSimulator.getMenuItemStates();
         menuItemState.setStart(false);
@@ -586,6 +590,23 @@ public class VSSimulatorFrame extends VSFrame {
         updateSimulatorMenu();
     }
 
+    /**
+     * Opens the given simulator file and starts playback if load succeeds.
+     *
+     * @param filename the simulation file to open
+     *
+     * @return the loaded simulator, or null if loading failed
+     */
+    public VSSimulator openAndStartSimulator(String filename) {
+        VSSerialize serialize = new VSSerialize();
+        VSSimulator simulator = serialize.openSimulator(filename, this);
+
+        if (simulator != null)
+            startCurrentSimulator();
+
+        return simulator;
+    }
+
     /**
      * Pauses the current simulator
      */
-- 
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