fix(desktop): make diagnostic export user-visible

dsh-plugin-desktop/src/electron-runtime.ts

@@ -88,6 +88,7 @@ export class ElectronDesktopRuntime implements DesktopRuntime {
   private quitting = false
   private readonly trayItems = new Map<symbol, DesktopTrayItem>()
   private terminalSpec: DesktopTerminalSpec | undefined
+  private diagnosticExport: Promise<void> | undefined
   private rendererBootReported = false
 
   constructor(
@@ -216,13 +217,22 @@ export class ElectronDesktopRuntime implements DesktopRuntime {
 
   /** @inheritdoc */
   exportDiagnostics(): Promise<void> {
+    if (this.diagnosticExport !== undefined) return this.diagnosticExport
+    const operation = this.performDiagnosticExport().finally(() => {
+      if (this.diagnosticExport === operation) this.diagnosticExport = undefined
+    })
+    this.diagnosticExport = operation
+    return operation
+  }
+
+  private performDiagnosticExport(): Promise<void> {
     return exportDiagnosticsZip(
       join(app.getPath('userData'), 'logs'),
       app.getPath('userData'),
     ).then((path) => {
       shell.showItemInFolder(path)
     }).catch((cause: unknown) => {
-      this.logError(`dsh-plugin-desktop: failed to export diagnostics: ${cause instanceof Error ? cause.message : String(cause)}`)
+      this.reportDiagnosticExportError(cause)
     })
   }
 
@@ -467,6 +477,17 @@ export class ElectronDesktopRuntime implements DesktopRuntime {
     }
   }
 
+  /** Keep diagnostic export failures visible in a packaged GUI process. */
+  private reportDiagnosticExportError(cause: unknown): void {
+    const error = cause instanceof Error ? cause : new Error(String(cause))
+    this.logError(`dsh-plugin-desktop: failed to export diagnostics: ${error.message}`)
+    try {
+      dialog.showErrorBox('Unable to Export Diagnostics', error.message)
+    } catch (dialogCause) {
+      this.logError(`dsh-plugin-desktop: failed to show diagnostics error: ${dialogCause instanceof Error ? dialogCause.message : String(dialogCause)}`)
+    }
+  }
+
   private rebuildTrayMenu(): void {
     const tray = this.tray
     const spec = this.scheduled

dsh-plugin-desktop/tests/electron-runtime.spec.ts

@@ -3,6 +3,7 @@ import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import type { DesktopShellSpec } from '../src/runtime.ts'
 
 const terminal = vi.hoisted(() => ({ open: vi.fn() }))
+const diagnostics = vi.hoisted(() => ({ export: vi.fn() }))
 const updater = vi.hoisted(() => ({ download: vi.fn() }))
 const childProcess = vi.hoisted(() => {
   type Listener = (...args: unknown[]) => void
@@ -35,6 +36,10 @@ vi.mock('../src/desktop-terminal.ts', async (importOriginal) => ({
   openDesktopTerminal: terminal.open,
 }))
 
+vi.mock('../src/diagnostic-export.ts', () => ({
+  exportDiagnosticsZip: diagnostics.export,
+}))
+
 vi.mock('../src/update-download.ts', () => ({
   downloadDesktopUpdate: updater.download,
 }))
@@ -162,6 +167,7 @@ const electron = vi.hoisted(() => {
     shell: {
       openExternal: vi.fn(async () => {}),
       openPath: vi.fn(async () => ''),
+      showItemInFolder: vi.fn(),
     },
     templateIcon,
     Tray,
@@ -213,6 +219,7 @@ describe('Electron compatibility runtime', () => {
     childProcess.reset()
     vi.clearAllMocks()
     updater.download.mockReset()
+    diagnostics.export.mockReset()
     electron.loadURL.mockReset()
     electron.loadURL.mockResolvedValue(undefined)
     electron.dialog.showMessageBox.mockResolvedValue({ response: 0, checkboxChecked: false })
@@ -495,6 +502,37 @@ describe('Electron compatibility runtime', () => {
     }
   })
 
+  it('coalesces concurrent diagnostic exports and reveals the completed archive', async () => {
+    const { ElectronDesktopRuntime } = await import('../src/electron-runtime.ts')
+    const runtime = new ElectronDesktopRuntime(async () => {})
+    let finishExport: ((path: string) => void) | undefined
+    diagnostics.export.mockReturnValue(new Promise(resolve => { finishExport = resolve }))
+
+    const first = runtime.exportDiagnostics()
+    const second = runtime.exportDiagnostics()
+    finishExport?.('C:\\Users\\Example\\diagnostics.zip')
+    await Promise.all([first, second])
+
+    expect(diagnostics.export).toHaveBeenCalledOnce()
+    expect(electron.shell.showItemInFolder).toHaveBeenCalledOnce()
+    expect(electron.shell.showItemInFolder).toHaveBeenCalledWith('C:\\Users\\Example\\diagnostics.zip')
+  })
+
+  it('shows a native error when diagnostic export fails', async () => {
+    const stderr = vi.spyOn(process.stderr, 'write').mockImplementation(() => true)
+    const { ElectronDesktopRuntime } = await import('../src/electron-runtime.ts')
+    const runtime = new ElectronDesktopRuntime(async () => {})
+    diagnostics.export.mockRejectedValueOnce(new Error('disk is full'))
+
+    await expect(runtime.exportDiagnostics()).resolves.toBeUndefined()
+
+    expect(electron.dialog.showErrorBox).toHaveBeenCalledWith(
+      'Unable to Export Diagnostics',
+      'disk is full',
+    )
+    expect(stderr).toHaveBeenCalledWith(expect.stringContaining('failed to export diagnostics: disk is full'))
+  })
+
   it('shows native errors for synchronous and asynchronous terminal launch failures', async () => {
     vi.spyOn(process, 'platform', 'get').mockReturnValue('win32')
     const stderr = vi.spyOn(process.stderr, 'write').mockImplementation(() => true)