Makelore 2.0 initial clean snapshot

electron/main/ipc/transcript-export.ts

@@ -0,0 +1,45 @@
+import { writeFile } from 'node:fs/promises';
+import { dialog, ipcMain, type BrowserWindow } from 'electron';
+
+interface TranscriptSaveRequest {
+  defaultPath?: unknown;
+  markdown?: unknown;
+}
+
+const MAX_TRANSCRIPT_MARKDOWN_BYTES = 10 * 1024 * 1024;
+
+function safeDefaultPath(value: unknown): string {
+  if (typeof value !== 'string') return 'chat-transcript.md';
+  const fileName = value.split(/[\\/]/).filter(Boolean).at(-1)?.trim();
+  if (!fileName) return 'chat-transcript.md';
+  return fileName.toLowerCase().endsWith('.md') ? fileName : `${fileName}.md`;
+}
+
+export function registerTranscriptExportHandler(mainWindow: BrowserWindow): void {
+  ipcMain.handle('transcript:save', async (_event, request: TranscriptSaveRequest) => {
+    if (typeof request?.markdown !== 'string') {
+      throw new Error('Invalid transcript markdown');
+    }
+    if (Buffer.byteLength(request.markdown, 'utf8') > MAX_TRANSCRIPT_MARKDOWN_BYTES) {
+      throw new Error('Transcript is too large');
+    }
+
+    let selected: Electron.SaveDialogReturnValue;
+    try {
+      selected = await dialog.showSaveDialog(mainWindow, {
+        defaultPath: safeDefaultPath(request.defaultPath),
+        filters: [{ name: 'Markdown', extensions: ['md'] }],
+      });
+    } catch {
+      throw new Error('Failed to save transcript');
+    }
+    if (selected.canceled || !selected.filePath) return { status: 'cancelled' as const };
+
+    try {
+      await writeFile(selected.filePath, request.markdown, 'utf8');
+    } catch {
+      throw new Error('Failed to save transcript');
+    }
+    return { status: 'saved' as const };
+  });
+}