feat(vscode-ide-companion): add MarkdownRenderer component for rich message formatting

- Added MarkdownRenderer component with markdown-it integration
- Updated MessageContent to use MarkdownRenderer instead of custom parsing
- Added CSS styling for markdown-rendered content

This improves message display with proper markdown rendering support.

packages/vscode-ide-companion/src/webview/components/MarkdownRenderer.css

@@ -0,0 +1,188 @@
+/**
+ * @license
+ * Copyright 2025 Qwen Team
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Styles for MarkdownRenderer component
+ */
+
+.markdown-content {
+  /* Base styles for markdown content */
+  line-height: 1.6;
+  color: var(--app-primary-foreground);
+}
+
+.markdown-content h1,
+.markdown-content h2,
+.markdown-content h3,
+.markdown-content h4,
+.markdown-content h5,
+.markdown-content h6 {
+  margin-top: 1.5em;
+  margin-bottom: 0.5em;
+  font-weight: 600;
+}
+
+.markdown-content h1 {
+  font-size: 1.75em;
+  border-bottom: 1px solid var(--app-primary-border-color);
+  padding-bottom: 0.3em;
+}
+
+.markdown-content h2 {
+  font-size: 1.5em;
+  border-bottom: 1px solid var(--app-primary-border-color);
+  padding-bottom: 0.3em;
+}
+
+.markdown-content h3 {
+  font-size: 1.25em;
+}
+
+.markdown-content h4 {
+  font-size: 1.1em;
+}
+
+.markdown-content h5,
+.markdown-content h6 {
+  font-size: 1em;
+}
+
+.markdown-content p {
+  margin-top: 0;
+  /* margin-bottom: 1em; */
+}
+
+.markdown-content ul,
+.markdown-content ol {
+  margin-top: 0;
+  margin-bottom: 1em;
+  padding-left: 2em;
+}
+
+.markdown-content li {
+  margin-bottom: 0.25em;
+}
+
+.markdown-content li > p {
+  margin-top: 0.5em;
+  margin-bottom: 0.5em;
+}
+
+.markdown-content blockquote {
+  margin: 0 0 1em;
+  padding: 0 1em;
+  border-left: 0.25em solid var(--app-primary-border-color);
+  color: var(--app-secondary-foreground);
+}
+
+.markdown-content a {
+  color: var(--app-link-foreground, #007acc);
+  text-decoration: none;
+}
+
+.markdown-content a:hover {
+  color: var(--app-link-active-foreground, #005a9e);
+  text-decoration: underline;
+}
+
+.markdown-content code {
+  font-family: var(
+    --app-monospace-font-family,
+    'SF Mono',
+    Monaco,
+    'Cascadia Code',
+    'Roboto Mono',
+    Consolas,
+    'Courier New',
+    monospace
+  );
+  font-size: 0.9em;
+  background-color: var(--app-code-background, rgba(0, 0, 0, 0.05));
+  border: 1px solid var(--app-primary-border-color);
+  border-radius: var(--corner-radius-small, 4px);
+  padding: 0.2em 0.4em;
+  white-space: nowrap;
+}
+
+.markdown-content pre {
+  margin: 1em 0;
+  padding: 1em;
+  overflow-x: auto;
+  background-color: var(--app-code-background, rgba(0, 0, 0, 0.05));
+  border: 1px solid var(--app-primary-border-color);
+  border-radius: var(--corner-radius-small, 4px);
+  font-family: var(
+    --app-monospace-font-family,
+    'SF Mono',
+    Monaco,
+    'Cascadia Code',
+    'Roboto Mono',
+    Consolas,
+    'Courier New',
+    monospace
+  );
+  font-size: 0.9em;
+  line-height: 1.5;
+}
+
+.markdown-content pre code {
+  background: none;
+  border: none;
+  padding: 0;
+  white-space: pre;
+}
+
+.markdown-content .file-path-link {
+  background: transparent;
+  border: none;
+  padding: 0;
+  font-family: var(
+    --app-monospace-font-family,
+    'SF Mono',
+    Monaco,
+    'Cascadia Code',
+    'Roboto Mono',
+    Consolas,
+    'Courier New',
+    monospace
+  );
+  font-size: 0.95em;
+  color: var(--app-link-foreground, #007acc);
+  text-decoration: underline;
+  cursor: pointer;
+  transition: color 0.1s ease;
+}
+
+.markdown-content .file-path-link:hover {
+  color: var(--app-link-active-foreground, #005a9e);
+}
+
+.markdown-content hr {
+  border: none;
+  border-top: 1px solid var(--app-primary-border-color);
+  margin: 1.5em 0;
+}
+
+.markdown-content img {
+  max-width: 100%;
+  height: auto;
+}
+
+.markdown-content table {
+  width: 100%;
+  border-collapse: collapse;
+  margin: 1em 0;
+}
+
+.markdown-content th,
+.markdown-content td {
+  padding: 0.5em 1em;
+  border: 1px solid var(--app-primary-border-color);
+  text-align: left;
+}
+
+.markdown-content th {
+  background-color: var(--app-secondary-background);
+  font-weight: 600;
+}

packages/vscode-ide-companion/src/webview/components/MarkdownRenderer.tsx

@@ -0,0 +1,158 @@
+/**
+ * @license
+ * Copyright 2025 Qwen Team
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * MarkdownRenderer component - renders markdown content with syntax highlighting and clickable file paths
+ */
+
+import type React from 'react';
+import MarkdownIt from 'markdown-it';
+import type { Options as MarkdownItOptions } from 'markdown-it';
+import './MarkdownRenderer.css';
+
+interface MarkdownRendererProps {
+  content: string;
+  onFileClick?: (filePath: string) => void;
+}
+
+/**
+ * Regular expressions for parsing content
+ */
+const FILE_PATH_REGEX =
+  /([a-zA-Z]:)?([/\\][\w\-. ]+)+\.(tsx?|jsx?|css|scss|json|md|py|java|go|rs|c|cpp|h|hpp|sh|yaml|yml|toml|xml|html|vue|svelte)/gi;
+// Match file paths with optional line numbers like: path/file.ts#7-14 or path/file.ts#7
+const FILE_PATH_WITH_LINES_REGEX =
+  /([a-zA-Z]:)?([/\\][\w\-. ]+)+\.(tsx?|jsx?|css|scss|json|md|py|java|go|rs|c|cpp|h|hpp|sh|yaml|yml|toml|xml|html|vue|svelte)#(\d+)(?:-(\d+))?/gi;
+
+/**
+ * MarkdownRenderer component - renders markdown content with enhanced features
+ */
+export const MarkdownRenderer: React.FC<MarkdownRendererProps> = ({
+  content,
+  onFileClick,
+}) => {
+  /**
+   * Initialize markdown-it with plugins
+   */
+  const getMarkdownInstance = (): MarkdownIt => {
+    // Create markdown-it instance with options
+    const md = new MarkdownIt({
+      html: false, // Disable HTML for security
+      xhtmlOut: false,
+      breaks: true,
+      linkify: true,
+      typographer: true,
+    } as MarkdownItOptions);
+
+    // Add syntax highlighting for code blocks
+    md.use((md) => {
+      md.renderer.rules.code_block = function (
+        tokens,
+        idx: number,
+        _options,
+        _env,
+      ) {
+        const token = tokens[idx];
+        const lang = token.info || 'plaintext';
+        const content = token.content;
+
+        // Add syntax highlighting classes
+        return `<pre class="code-block language-${lang}"><code class="language-${lang}">${md.utils.escapeHtml(content)}</code></pre>`;
+      };
+
+      md.renderer.rules.fence = function (tokens, idx: number, _options, _env) {
+        const token = tokens[idx];
+        const lang = token.info || 'plaintext';
+        const content = token.content;
+
+        // Add syntax highlighting classes
+        return `<pre class="code-block language-${lang}"><code class="language-${lang}">${md.utils.escapeHtml(content)}</code></pre>`;
+      };
+    });
+
+    return md;
+  };
+
+  /**
+   * Render markdown content to HTML
+   */
+  const renderMarkdown = (): string => {
+    try {
+      const md = getMarkdownInstance();
+
+      // Process the markdown content
+      let html = md.render(content);
+
+      // Post-process to add file path click handlers
+      html = processFilePaths(html);
+
+      return html;
+    } catch (error) {
+      console.error('Error rendering markdown:', error);
+      // Fallback to plain text if markdown rendering fails
+      return escapeHtml(content);
+    }
+  };
+
+  /**
+   * Escape HTML characters for security
+   */
+  const escapeHtml = (unsafe: string): string =>
+    unsafe
+      .replace(/&/g, '&amp;')
+      .replace(/</g, '&lt;')
+      .replace(/>/g, '&gt;')
+      .replace(/"/g, '&quot;')
+      .replace(/'/g, '&#039;');
+
+  /**
+   * Process file paths in HTML to make them clickable
+   */
+  const processFilePaths = (html: string): string => {
+    // Process file paths with line numbers
+    html = html.replace(FILE_PATH_WITH_LINES_REGEX, (match) => {
+      const filePath = match.split('#')[0];
+      return `<button class="file-path-link" onclick="window.handleFileClick('${filePath}')" title="Open ${match}">${match}</button>`;
+    });
+
+    // Process regular file paths
+    html = html.replace(FILE_PATH_REGEX, (match) => {
+      // Skip if this was already processed as a path with line numbers
+      if (FILE_PATH_WITH_LINES_REGEX.test(match)) {
+        return match;
+      }
+      return `<button class="file-path-link" onclick="window.handleFileClick('${match}')" title="Open ${match}">${match}</button>`;
+    });
+
+    return html;
+  };
+
+  /**
+   * Handle file click event
+   */
+  const handleFileClick = (filePath: string) => {
+    if (onFileClick) {
+      onFileClick(filePath);
+    }
+  };
+
+  // Attach the handler to window for use in HTML onclick attributes
+  if (typeof window !== 'undefined') {
+    (
+      window as { handleFileClick?: (filePath: string) => void }
+    ).handleFileClick = handleFileClick;
+  }
+
+  return (
+    <div
+      className="markdown-content"
+      dangerouslySetInnerHTML={{ __html: renderMarkdown() }}
+      style={{
+        wordWrap: 'break-word',
+        overflowWrap: 'break-word',
+        whiteSpace: 'normal',
+      }}
+    />
+  );
+};

packages/vscode-ide-companion/src/webview/components/MessageContent.tsx

@@ -7,6 +7,7 @@
  */
 
 import type React from 'react';
+import { MarkdownRenderer } from './MarkdownRenderer.tsx';
 
 interface MessageContentProps {
   content: string;
@@ -14,270 +15,9 @@ interface MessageContentProps {
 }
 
 /**
- * Regular expressions for parsing content
- */
-const FILE_PATH_REGEX =
-  /([a-zA-Z]:)?([/\\][\w\-. ]+)+\.(tsx?|jsx?|css|scss|json|md|py|java|go|rs|c|cpp|h|hpp|sh|yaml|yml|toml|xml|html|vue|svelte)/gi;
-// Match file paths with optional line numbers like: path/file.ts#7-14 or path/file.ts#7
-const FILE_PATH_WITH_LINES_REGEX =
-  /([a-zA-Z]:)?([/\\][\w\-. ]+)+\.(tsx?|jsx?|css|scss|json|md|py|java|go|rs|c|cpp|h|hpp|sh|yaml|yml|toml|xml|html|vue|svelte)#(\d+)(?:-(\d+))?/gi;
-const CODE_BLOCK_REGEX = /```(\w+)?\n([\s\S]*?)```/g;
-const INLINE_CODE_REGEX = /`([^`]+)`/g;
-
-/**
- * Parses message content and renders with syntax highlighting and clickable file paths
+ * MessageContent component - renders message content with markdown support
  */
 export const MessageContent: React.FC<MessageContentProps> = ({
   content,
   onFileClick,
-}) => {
-  /**
-   * Parse and render content with special handling for code blocks, inline code, and file paths
-   */
-  const renderContent = () => {
-    const parts: React.ReactNode[] = [];
-    let lastIndex = 0;
-    let matchIndex = 0;
-
-    // First, handle code blocks
-    const codeBlockMatches = Array.from(content.matchAll(CODE_BLOCK_REGEX));
-
-    codeBlockMatches.forEach((match) => {
-      const [fullMatch, language, code] = match;
-      const startIndex = match.index!;
-
-      // Add text before code block
-      if (startIndex > lastIndex) {
-        const textBefore = content.slice(lastIndex, startIndex);
-        parts.push(...renderTextWithInlineCodeAndPaths(textBefore, matchIndex));
-        matchIndex++;
-      }
-
-      // Add code block with Tailwind CSS
-      parts.push(
-        <pre
-          key={`code-${matchIndex}`}
-          className="my-2 overflow-x-auto rounded p-3 leading-[1.5]"
-          style={{
-            backgroundColor: 'var(--app-code-background, rgba(0, 0, 0, 0.05))',
-            border: '1px solid var(--app-primary-border-color)',
-            borderRadius: 'var(--corner-radius-small, 4px)',
-            fontFamily:
-              "var(--app-monospace-font-family, 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace)",
-            fontSize: '13px',
-          }}
-        >
-          <code
-            className={`language-${language || 'plaintext'}`}
-            style={{
-              background: 'none',
-              padding: 0,
-              fontFamily: 'inherit',
-              color: 'var(--app-primary-foreground)',
-            }}
-          >
-            {code}
-          </code>
-        </pre>,
-      );
-      matchIndex++;
-
-      lastIndex = startIndex + fullMatch.length;
-    });
-
-    // Add remaining text
-    if (lastIndex < content.length) {
-      const remainingText = content.slice(lastIndex);
-      parts.push(
-        ...renderTextWithInlineCodeAndPaths(remainingText, matchIndex),
-      );
-    }
-
-    return parts.length > 0 ? parts : content;
-  };
-
-  /**
-   * Render text with inline code and file paths
-   */
-  const renderTextWithInlineCodeAndPaths = (
-    text: string,
-    startIndex: number,
-  ) => {
-    const parts: React.ReactNode[] = [];
-    let lastIndex = 0;
-    let matchIndex = startIndex;
-
-    // Split by inline code first
-    const inlineCodeMatches = Array.from(text.matchAll(INLINE_CODE_REGEX));
-
-    if (inlineCodeMatches.length === 0) {
-      // No inline code, just check for file paths
-      return renderTextWithFilePaths(text, matchIndex);
-    }
-
-    inlineCodeMatches.forEach((match) => {
-      const [fullMatch, code] = match;
-      const startIdx = match.index!;
-
-      // Add text before inline code (may contain file paths)
-      if (startIdx > lastIndex) {
-        parts.push(
-          ...renderTextWithFilePaths(
-            text.slice(lastIndex, startIdx),
-            matchIndex,
-          ),
-        );
-        matchIndex++;
-      }
-
-      // Add inline code with Tailwind CSS
-      parts.push(
-        <code
-          key={`inline-${matchIndex}`}
-          className="rounded px-1.5 py-0.5 whitespace-nowrap text-[0.9em] inline-block max-w-full overflow-hidden text-ellipsis align-baseline"
-          style={{
-            backgroundColor: 'var(--app-code-background, rgba(0, 0, 0, 0.05))',
-            border: '1px solid var(--app-primary-border-color)',
-            fontFamily:
-              "var(--app-monospace-font-family, 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace)",
-            color: 'var(--app-primary-foreground)',
-          }}
-        >
-          {code}
-        </code>,
-      );
-      matchIndex++;
-
-      lastIndex = startIdx + fullMatch.length;
-    });
-
-    // Add remaining text
-    if (lastIndex < text.length) {
-      parts.push(...renderTextWithFilePaths(text.slice(lastIndex), matchIndex));
-    }
-
-    return parts.length > 0 ? parts : [text];
-  };
-
-  /**
-   * Render text with file paths
-   */
-  const renderTextWithFilePaths = (text: string, startIndex: number) => {
-    const parts: React.ReactNode[] = [];
-    let lastIndex = 0;
-    let matchIndex = startIndex;
-
-    // First, try to match file paths with line numbers
-    const filePathWithLinesMatches = Array.from(
-      text.matchAll(FILE_PATH_WITH_LINES_REGEX),
-    );
-    const processedRanges: Array<{ start: number; end: number }> = [];
-
-    filePathWithLinesMatches.forEach((match) => {
-      const fullMatch = match[0];
-      const startIdx = match.index!;
-      const filePath = fullMatch.split('#')[0]; // Get path without line numbers
-      const startLine = match[4]; // Capture group 4 is the start line
-      const endLine = match[5]; // Capture group 5 is the end line (optional)
-
-      processedRanges.push({
-        start: startIdx,
-        end: startIdx + fullMatch.length,
-      });
-
-      // Add text before file path
-      if (startIdx > lastIndex) {
-        parts.push(text.slice(lastIndex, startIdx));
-      }
-
-      // Display text with line numbers
-      const displayText = endLine
-        ? `${filePath}#${startLine}-${endLine}`
-        : `${filePath}#${startLine}`;
-
-      // Add file path link with line numbers
-      parts.push(
-        <button
-          key={`path-${matchIndex}`}
-          className="bg-transparent border-0 p-0 underline cursor-pointer transition-colors text-[0.95em]"
-          style={{
-            fontFamily:
-              "var(--app-monospace-font-family, 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace)",
-            color: 'var(--app-link-foreground, #007ACC)',
-          }}
-          onMouseEnter={(e) => {
-            e.currentTarget.style.color =
-              'var(--app-link-active-foreground, #005A9E)';
-          }}
-          onMouseLeave={(e) => {
-            e.currentTarget.style.color = 'var(--app-link-foreground, #007ACC)';
-          }}
-          onClick={() => onFileClick?.(filePath)}
-          title={`Open ${displayText}`}
-        >
-          {displayText}
-        </button>,
-      );
-
-      matchIndex++;
-      lastIndex = startIdx + fullMatch.length;
-    });
-
-    // Now match regular file paths (without line numbers) that weren't already matched
-    const filePathMatches = Array.from(text.matchAll(FILE_PATH_REGEX));
-
-    filePathMatches.forEach((match) => {
-      const fullMatch = match[0];
-      const startIdx = match.index!;
-
-      // Skip if this range was already processed as a path with line numbers
-      const isProcessed = processedRanges.some(
-        (range) => startIdx >= range.start && startIdx < range.end,
-      );
-      if (isProcessed) {
-        return;
-      }
-
-      // Add text before file path
-      if (startIdx > lastIndex) {
-        parts.push(text.slice(lastIndex, startIdx));
-      }
-
-      // Add file path link with Tailwind CSS
-      parts.push(
-        <button
-          key={`path-${matchIndex}`}
-          className="bg-transparent border-0 p-0 underline cursor-pointer transition-colors text-[0.95em]"
-          style={{
-            fontFamily:
-              "var(--app-monospace-font-family, 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace)",
-            color: 'var(--app-link-foreground, #007ACC)',
-          }}
-          onMouseEnter={(e) => {
-            e.currentTarget.style.color =
-              'var(--app-link-active-foreground, #005A9E)';
-          }}
-          onMouseLeave={(e) => {
-            e.currentTarget.style.color = 'var(--app-link-foreground, #007ACC)';
-          }}
-          onClick={() => onFileClick?.(fullMatch)}
-          title={`Open ${fullMatch}`}
-        >
-          {fullMatch}
-        </button>,
-      );
-
-      matchIndex++;
-      lastIndex = startIdx + fullMatch.length;
-    });
-
-    // Add remaining text
-    if (lastIndex < text.length) {
-      parts.push(text.slice(lastIndex));
-    }
-
-    return parts.length > 0 ? parts : [text];
-  };
-
-  return <>{renderContent()}</>;
-};
+}) => <MarkdownRenderer content={content} onFileClick={onFileClick} />;