From 5a8ee73492f7da898df03a3ff28415d6715d1bfd Mon Sep 17 00:00:00 2001
From: Chad <167274875+UnsignedChad@users.noreply.github.com>
Date: Sun, 24 May 2026 16:56:18 -0400
Subject: [PATCH] pdnkit GUI: File > Export SPICE Netlist...

After running an IR-drop analysis, File > Export SPICE Netlist... opens
a save dialog and writes the cached IrMesh as a .cir file using the
existing pdnkit::pi::write_spice_netlist. Filename defaults to
<boardname>_ir.cir.

If no solve has been run, shows a friendly "run an analysis first"
message instead of writing an empty file.
---
 pdnkit/MainWindow.cpp | 34 ++++++++++++++++++++++++++++++++++
 pdnkit/MainWindow.h   |  1 +
 2 files changed, 35 insertions(+)

diff --git a/pdnkit/MainWindow.cpp b/pdnkit/MainWindow.cpp
index 8fada24..657bb07 100644
--- a/pdnkit/MainWindow.cpp
+++ b/pdnkit/MainWindow.cpp
@@ -35,6 +35,7 @@
 #include "pi/IrSolver.h"
 #include "pi/Thermal.h"
 #include "pi/Touchstone.h"
+#include "pi/SpiceExport.h"
 #include "render/IrResultMesh.h"
 
 MainWindow::MainWindow(QWidget* parent) : QMainWindow(parent) {
@@ -180,6 +181,9 @@ MainWindow::MainWindow(QWidget* parent) : QMainWindow(parent) {
         "Export &Touchstone (.s1p)...");
     connect(exportTouchstoneAct, &QAction::triggered, this,
             &MainWindow::onExportTouchstone);
+    auto* exportSpiceAct = fileMenu->addAction("Export &SPICE Netlist...");
+    connect(exportSpiceAct, &QAction::triggered, this,
+            &MainWindow::onExportSpiceNetlist);
     fileMenu->addSeparator();
     fileMenu->addAction("E&xit", this, &QWidget::close);
 
@@ -783,3 +787,33 @@ void MainWindow::onExportTouchstone() {
         8000);
 }
 
+void MainWindow::onExportSpiceNetlist() {
+    if (last_mesh_.nodes.empty()) {
+        QMessageBox::information(this, "Export SPICE",
+            "Run an IR-drop analysis first; there is no mesh to export.");
+        return;
+    }
+    const QString suggested = current_board_path_.isEmpty()
+        ? QString("pdnkit_ir.cir")
+        : QFileInfo(current_board_path_).completeBaseName() + "_ir.cir";
+    const QString path = QFileDialog::getSaveFileName(
+        this, "Export SPICE Netlist", suggested,
+        "SPICE netlist (*.cir);;All files (*)");
+    if (path.isEmpty()) return;
+
+    pdnkit::pi::SpiceExportConfig cfg;
+    cfg.title = std::string("pdnkit IR-drop network: ") +
+                QFileInfo(current_board_path_).fileName().toStdString();
+    if (!pdnkit::pi::write_spice_netlist(last_mesh_,
+                                          path.toStdString(), cfg)) {
+        QMessageBox::critical(this, "Export SPICE",
+            "Failed to write " + path);
+        return;
+    }
+    statusBar()->showMessage(
+        QString("Wrote SPICE netlist to %1 (%2 nodes, %3 resistors)")
+            .arg(path)
+            .arg(last_mesh_.nodes.size())
+            .arg(last_mesh_.resistors.size()),
+        8000);
+}
diff --git a/pdnkit/MainWindow.h b/pdnkit/MainWindow.h
index 51477da..6dd2edf 100644
--- a/pdnkit/MainWindow.h
+++ b/pdnkit/MainWindow.h
@@ -42,6 +42,7 @@ private slots:
     void onSaveCanvasImage();
     void onExportResultsCsv();
     void onExportTouchstone();
+    void onExportSpiceNetlist();
     void onAboutDialog();
     void onShortcutsDialog();