fix(chat): support code block copy feedback (#349)

packages/client/src/components/hermes/chat/MarkdownRenderer.vue

@@ -199,8 +199,16 @@ onBeforeUnmount(() => {
   renderGeneration += 1
 })
 
-function handleMarkdownClick(event: MouseEvent): void {
+async function handleMarkdownClick(event: MouseEvent): Promise<void> {
-  void handleCodeBlockCopyClick(event)
+  const copyResult = await handleCodeBlockCopyClick(event)
+  if (copyResult !== null) {
+    if (copyResult) {
+      message.success(t('common.copied'))
+    } else {
+      message.error(t('chat.copyFailed'))
+    }
+    return
+  }
 
   // Handle file path link clicks for download
   const target = event.target as HTMLElement

packages/client/src/components/hermes/chat/MessageItem.vue

@@ -4,6 +4,7 @@ import { computed, onBeforeUnmount, ref, watchEffect } from "vue";
 import { useI18n } from "vue-i18n";
 import { useMessage } from "naive-ui";
 import { downloadFile } from "@/api/hermes/download";
+import { copyToClipboard } from "@/utils/clipboard";
 import MarkdownRenderer from "./MarkdownRenderer.vue";
 import { parseThinking, countThinkingChars } from "@/utils/thinking-parser";
 import { useChatStore } from "@/stores/hermes/chat";
@@ -38,12 +39,12 @@ const copyableContent = computed(() => {
 async function copyBubbleContent() {
   const text = copyableContent.value
   if (!text) return
-  try {
+  const ok = await copyToClipboard(text)
-    await navigator.clipboard.writeText(text)
+  if (ok) {
     toast.success(t('chat.copiedBubble'))
-  } catch {
+    return
-    toast.error(t('chat.copyFailed'))
   }
+  toast.error(t('chat.copyFailed'))
 }
 
 const parsedThinking = computed(() =>
@@ -229,15 +230,21 @@ async function handleToolDetailClick(event: MouseEvent): Promise<void> {
 
   const source = button.closest<HTMLElement>("[data-copy-source]")?.dataset.copySource;
   if (source === "tool-args" && fullToolArgs.value) {
-    await copyTextToClipboard(fullToolArgs.value);
+    const ok = await copyTextToClipboard(fullToolArgs.value);
+    if (ok) toast.success(t("common.copied"));
+    else toast.error(t("chat.copyFailed"));
     return;
   }
   if (source === "tool-result" && fullToolResult.value) {
-    await copyTextToClipboard(fullToolResult.value);
+    const ok = await copyTextToClipboard(fullToolResult.value);
+    if (ok) toast.success(t("common.copied"));
+    else toast.error(t("chat.copyFailed"));
     return;
   }
 
-  await handleCodeBlockCopyClick(event);
+  const copyResult = await handleCodeBlockCopyClick(event);
+  if (copyResult) toast.success(t("common.copied"));
+  else if (copyResult === false) toast.error(t("chat.copyFailed"));
 }
 
 const hasAttachments = computed(

packages/client/src/components/hermes/chat/highlight.ts

@@ -1,4 +1,5 @@
 import hljs from 'highlight.js'
+import { copyToClipboard } from '@/utils/clipboard'
 
 const LANGUAGE_ALIASES: Record<string, string> = {
   shellscript: 'bash',
@@ -80,27 +81,23 @@ export function renderHighlightedCodeBlock(
   return `<pre class="hljs-code-block"><div class="code-header">${languageLabelHtml}<button type="button" class="copy-btn" data-copy-code="true">${escapeHtml(copyLabel)}</button></div><code class="hljs language-${sanitizeLanguageClass(codeClassLanguage)}">${highlighted}</code></pre>`
 }
 
-export async function copyTextToClipboard(text: string): Promise<void> {
+export async function copyTextToClipboard(text: string): Promise<boolean> {
-  try {
+  return copyToClipboard(text)
-    await navigator.clipboard?.writeText?.(text)
-  } catch {
-    // Ignore clipboard failures; the code block still renders safely.
-  }
 }
 
-export async function handleCodeBlockCopyClick(event: MouseEvent): Promise<void> {
+export async function handleCodeBlockCopyClick(event: MouseEvent): Promise<boolean | null> {
   const target = event.target
-  if (!(target instanceof HTMLElement)) return
+  if (!(target instanceof HTMLElement)) return null
 
   const button = target.closest<HTMLElement>('[data-copy-code="true"]')
-  if (!button) return
+  if (!button) return null
 
   event.preventDefault()
 
   const block = button.closest('.hljs-code-block')
   const code = block?.querySelector('code')
   const text = code?.textContent ?? ''
-  if (!text) return
+  if (!text) return false
 
-  await copyTextToClipboard(text)
+  return copyTextToClipboard(text)
 }

tests/client/markdown-rendering.test.ts

@@ -50,6 +50,10 @@ describe('MarkdownRenderer', () => {
       svg: `<svg id="${id}" data-testid="mermaid-svg"><text>${source}</text></svg>`,
     }))
 
+    Object.defineProperty(window, 'isSecureContext', {
+      configurable: true,
+      value: true,
+    })
     Object.defineProperty(navigator, 'clipboard', {
       configurable: true,
       value: {
@@ -466,4 +470,30 @@ describe('MarkdownRenderer', () => {
 
     expect(writeText).toHaveBeenCalledWith(expected)
   })
+
+  it('falls back to legacy clipboard copy when the Clipboard API is unavailable', async () => {
+    Object.defineProperty(window, 'isSecureContext', {
+      configurable: true,
+      value: false,
+    })
+    Object.defineProperty(navigator, 'clipboard', {
+      configurable: true,
+      value: undefined,
+    })
+    const execCommand = vi.fn(() => true)
+    Object.defineProperty(document, 'execCommand', {
+      configurable: true,
+      value: execCommand,
+    })
+
+    const wrapper = mount(MarkdownRenderer, {
+      props: {
+        content: '```ts\nconst answer = 42\n```',
+      },
+    })
+
+    await wrapper.find('[data-copy-code="true"]').trigger('click')
+
+    expect(execCommand).toHaveBeenCalledWith('copy')
+  })
 })

tests/client/message-item-highlight.test.ts

@@ -24,6 +24,10 @@ import type { Message } from '@/stores/hermes/chat'
 describe('MessageItem tool details', () => {
   beforeEach(() => {
     setActivePinia(createPinia())
+    Object.defineProperty(window, 'isSecureContext', {
+      configurable: true,
+      value: true,
+    })
     Object.defineProperty(navigator, 'clipboard', {
       configurable: true,
       value: {