From e5a1ec288f733c5024df1509686cab2e4e96a0d1 Mon Sep 17 00:00:00 2001
From: dev <dev@local>
Date: Tue, 24 Feb 2026 12:46:56 +0000
Subject: [PATCH] feat(main): implement def run_app

---
 scanslicer/main.py | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/scanslicer/main.py b/scanslicer/main.py
index 39a6e43..683ed71 100644
--- a/scanslicer/main.py
+++ b/scanslicer/main.py
@@ -443,3 +443,21 @@ class QtScanSlicer(QMainWindow, ScanSlicerUiBuilderMixin, ScanSlicerControllerMi
         if hasattr(self, "_close_status_log"):
             self._close_status_log()
         super().closeEvent(event)
+
+# run_app: function definition for ScanSlicer behavior.
+def run_app(startup_dir=None):
+    app = QApplication.instance()
+    if app is None:
+        app = QApplication(sys.argv)
+    apply_dark_theme_if_requested(app)
+    apply_global_text_size_offset(app, 2)
+    app.setApplicationName("ScanSlicer")
+    app.setApplicationDisplayName("ScanSlicer")
+    app.setDesktopFileName("scanslicer")
+    app_icon = resolve_app_icon()
+    if not app_icon.isNull():
+        app.setWindowIcon(app_icon)
+
+    scan_slicer_window = QtScanSlicer(startup_dir)
+    scan_slicer_window.showMaximized()
+    return app.exec()