feat: Autofix spec-char-escape rule

htmlhint-server/src/server.ts

@@ -1267,6 +1267,98 @@ function createAttrNoUnnecessaryWhitespaceFix(
   };
 }
 
+/**
+ * Create auto-fix action for spec-char-escape rule
+ */
+function createSpecCharEscapeFix(
+  document: TextDocument,
+  diagnostic: Diagnostic,
+): CodeAction | null {
+  if (
+    !diagnostic.data ||
+    diagnostic.data.ruleId !== "spec-char-escape" ||
+    typeof diagnostic.data.line !== "number" ||
+    typeof diagnostic.data.col !== "number"
+  ) {
+    return null;
+  }
+
+  const text = document.getText();
+  const lines = text.split("\n");
+  const line = lines[diagnostic.data.line - 1];
+
+  if (!line) {
+    return null;
+  }
+
+  // Find unescaped special characters that need to be escaped
+  // We need to be careful not to escape characters that are already in HTML tags or attributes
+  const specialCharPattern = /([<>])/g;
+  let match;
+  const edits: TextEdit[] = [];
+
+  while ((match = specialCharPattern.exec(line)) !== null) {
+    const startCol = match.index;
+    const endCol = startCol + match[1].length;
+    const char = match[1];
+
+    // Check if this match is at or near the diagnostic position
+    const diagnosticCol = diagnostic.data.col - 1;
+    if (Math.abs(startCol - diagnosticCol) <= 5) {
+      // Determine if this character is inside a tag (should not be escaped)
+      const beforeMatch = line.substring(0, startCol);
+      const lastOpenBracket = beforeMatch.lastIndexOf("<");
+      const lastCloseBracket = beforeMatch.lastIndexOf(">");
+
+      // If we're inside a tag (after < but before >), don't escape
+      if (lastOpenBracket > lastCloseBracket) {
+        continue;
+      }
+
+      const lineStartPos = document.positionAt(
+        text
+          .split("\n")
+          .slice(0, diagnostic.data.line - 1)
+          .join("\n").length + (diagnostic.data.line > 1 ? 1 : 0),
+      );
+      const startPos = { line: lineStartPos.line, character: startCol };
+      const endPos = { line: lineStartPos.line, character: endCol };
+
+      // Map characters to their HTML entities
+      const entityMap: { [key: string]: string } = {
+        "<": "&lt;",
+        ">": "&gt;",
+      };
+
+      const replacement = entityMap[char];
+      if (replacement) {
+        edits.push({
+          range: { start: startPos, end: endPos },
+          newText: replacement,
+        });
+        break; // Only fix the first occurrence near the diagnostic
+      }
+    }
+  }
+
+  if (edits.length === 0) {
+    return null;
+  }
+
+  const workspaceEdit: WorkspaceEdit = {
+    changes: {
+      [document.uri]: edits,
+    },
+  };
+
+  return {
+    title: "Escape special character",
+    kind: CodeActionKind.QuickFix,
+    edit: workspaceEdit,
+    isPreferred: true,
+  };
+}
+
 /**
  * Create auto-fix actions for supported rules
  */
@@ -1345,6 +1437,10 @@ async function createAutoFixes(
           trace(`[DEBUG] Calling createAttrNoUnnecessaryWhitespaceFix`);
           fix = createAttrNoUnnecessaryWhitespaceFix(document, diagnostic);
           break;
+        case "spec-char-escape":
+          trace(`[DEBUG] Calling createSpecCharEscapeFix`);
+          fix = createSpecCharEscapeFix(document, diagnostic);
+          break;
         default:
           trace(`[DEBUG] No autofix function found for rule: ${ruleId}`);
           break;

htmlhint/CHANGELOG.md

@@ -2,6 +2,11 @@
 
 All notable changes to the "vscode-htmlhint" extension will be documented in this file.
 
+### v1.10.2 (2025-06-19)
+
+- Add autofix for `spec-char-escape` rule
+- Rename extension output channel to "HTMLHint Extension" for better debugging
+
 ### v1.10.1 (2025-06-19)
 
 - Update HTMLHint to v1.6.3

htmlhint/README.md

@@ -6,7 +6,7 @@ Integrates the [HTMLHint](https://github.com/htmlhint/HTMLHint) static analysis
 
 ## Configuration
 
-The HTMLHint extension will attempt to use the locally installed HTMLHint module (the project-specific module if present, or a globally installed HTMLHint module). If a locally installed HTMLHint isn't available, the extension will use the embedded version (current version 1.5.1).
+The HTMLHint extension will attempt to use the locally installed HTMLHint module (the project-specific module if present, or a globally installed HTMLHint module). If a locally installed HTMLHint isn't available, the extension will use the embedded version (current version 1.6.3).
 
 To install a version to the local project folder, run `npm install --save-dev htmlhint`. To install a global version on the current machine, run `npm install --global htmlhint`.
 
@@ -22,6 +22,25 @@ Many problems can now be fixed automatically by clicking on the lightbulb icon i
 
 ![hover](https://github.com/htmlhint/vscode-htmlhint/raw/main/htmlhint/images/hover.png)
 
+### Auto-fix Support
+
+The extension provides automatic fixes for many common HTML issues. Currently supported auto-fixes include:
+
+- **`alt-require`** - Adds alt attribute to images
+- **`attr-lowercase`** - Converts uppercase attribute names to lowercase
+- **`attr-no-unnecessary-whitespace`** - Removes unnecessary whitespace around attributes
+- **`attr-value-double-quotes`** - Converts single quotes to double quotes in attributes
+- **`button-type-require`** - Adds type attribute to buttons
+- **`doctype-first`** - Adds DOCTYPE declaration at the beginning
+- **`doctype-html5`** - Updates DOCTYPE to HTML5
+- **`html-lang-require`** - Adds `lang` attribute to `<html>` tag
+- **`meta-charset-require`** - Adds charset meta tag
+- **`meta-description-require`** - Adds description meta tag
+- **`meta-viewport-require`** - Adds viewport meta tag
+- **`spec-char-escape`** - Escapes special characters (`<`, `>`)
+- **`tagname-lowercase`** - Converts uppercase tag names to lowercase
+- **`title-require`** - Adds `<title>` tag to document
+
 > **Note:** HTMLHint will only analyze open HTML files and does not search for HTML files in your project folder.
 
 ## Rules

htmlhint/extension.ts

@@ -15,7 +15,7 @@ let outputChannel: vscode.OutputChannel;
 
 export function activate(context: vscode.ExtensionContext) {
   // Create output channel for logging
-  outputChannel = vscode.window.createOutputChannel("HTMLHint");
+  outputChannel = vscode.window.createOutputChannel("HTMLHint Extension");
   context.subscriptions.push(outputChannel);
 
   // Register the create config command

htmlhint/package.json

@@ -3,7 +3,7 @@
   "displayName": "HTMLHint",
   "description": "VS Code integration for HTMLHint - A Static Code Analysis Tool for HTML",
   "icon": "images/icon.png",
-  "version": "1.10.1",
+  "version": "1.10.2",
   "publisher": "HTMLHint",
   "galleryBanner": {
     "color": "#333333",

test/autofix/.htmlhintrc

@@ -2,8 +2,9 @@
   "alt-require": true,
   "attr-lowercase": true,
   "attr-no-unnecessary-whitespace": true,
-  "button-type-require": true,
   "attr-value-double-quotes": true,
+  "attr-value-no-duplication": true,
+  "button-type-require": true,
   "doctype-first": true,
   "doctype-html5": true,
   "html-lang-require": true,

test/autofix/test-autofixes.html

@@ -36,6 +36,8 @@
       </p>
     </div>
 
+   < Hello >
+
     <!-- More void elements -->
     <img src="footer.jpg">
     <br />