From 1b8dab92b9177946ba9cdd96afd3df3541f7f2cb Mon Sep 17 00:00:00 2001
From: Alex Gleason <alex@alexgleason.me>
Date: Fri, 30 May 2025 23:02:12 +0200
Subject: [PATCH] webmanifest eslint

---
 eslint-rules/index.js               |  2 +
 eslint-rules/require-webmanifest.js | 84 +++++++++++++++++++++++++++++
 eslint.config.js                    |  2 +
 3 files changed, 88 insertions(+)
 create mode 100644 eslint-rules/require-webmanifest.js

diff --git a/eslint-rules/index.js b/eslint-rules/index.js
index 7569a01..d534be1 100644
--- a/eslint-rules/index.js
+++ b/eslint-rules/index.js
@@ -1,7 +1,9 @@
 import noPlaceholderComments from './no-placeholder-comments.js';
+import requireWebmanifest from './require-webmanifest.js';
 
 export default {
   rules: {
     'no-placeholder-comments': noPlaceholderComments,
+    'require-webmanifest': requireWebmanifest,
   },
 };
\ No newline at end of file
diff --git a/eslint-rules/require-webmanifest.js b/eslint-rules/require-webmanifest.js
new file mode 100644
index 0000000..312bafd
--- /dev/null
+++ b/eslint-rules/require-webmanifest.js
@@ -0,0 +1,84 @@
+import fs from 'fs';
+import path from 'path';
+
+export default {
+  meta: {
+    type: 'problem',
+    docs: {
+      description: 'Require web manifest file and proper HTML link tag',
+      category: 'Best Practices',
+    },
+    fixable: null,
+    schema: [],
+    messages: {
+      missingManifestFile: 'Web manifest file not found. Expected {{expectedPath}}',
+      missingManifestLink: 'Missing web manifest link tag in HTML head',
+      invalidManifestLink: 'Web manifest link tag has incorrect rel or href attribute',
+    },
+  },
+
+  create(context) {
+    const filename = context.getFilename();
+    
+    // Only run this rule on HTML files
+    if (!filename.endsWith('.html')) {
+      return {};
+    }
+
+    return {
+      Program(node) {
+        const sourceCode = context.getSourceCode();
+        const htmlContent = sourceCode.getText();
+        
+        // Check for manifest link tag in HTML
+        const manifestLinkRegex = /<link[^>]*rel=["']manifest["'][^>]*>/i;
+        const manifestMatch = htmlContent.match(manifestLinkRegex);
+        
+        if (!manifestMatch) {
+          context.report({
+            node,
+            messageId: 'missingManifestLink',
+          });
+          return;
+        }
+
+        // Extract href from the manifest link
+        const hrefMatch = manifestMatch[0].match(/href=["']([^"']+)["']/i);
+        if (!hrefMatch) {
+          context.report({
+            node,
+            messageId: 'invalidManifestLink',
+          });
+          return;
+        }
+
+        const manifestPath = hrefMatch[1];
+        
+        // Resolve the manifest file path relative to the project root
+        const htmlDir = path.dirname(filename);
+        let resolvedManifestPath;
+        
+        if (manifestPath.startsWith('/')) {
+          // Absolute path - check in public directory first, then project root
+          const publicPath = path.resolve(htmlDir, 'public' + manifestPath);
+          const rootPath = path.resolve(htmlDir, '.' + manifestPath);
+          resolvedManifestPath = fs.existsSync(publicPath) ? publicPath : rootPath;
+        } else {
+          // Relative path
+          resolvedManifestPath = path.resolve(htmlDir, manifestPath);
+        }
+        
+        // Check if the manifest file exists
+        if (!fs.existsSync(resolvedManifestPath)) {
+          context.report({
+            node,
+            messageId: 'missingManifestFile',
+            data: {
+              expectedPath: manifestPath,
+            },
+          });
+        }
+      },
+    };
+  },
+};
\ No newline at end of file
diff --git a/eslint.config.js b/eslint.config.js
index 9fda677..a26dff1 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -35,6 +35,7 @@ export default tseslint.config(
     files: ["**/*.html"],
     plugins: {
       "@html-eslint": htmlEslint,
+      "custom": customRules,
     },
     languageOptions: {
       parser: htmlParser,
@@ -43,6 +44,7 @@ export default tseslint.config(
       "@html-eslint/require-title": "error",
       "@html-eslint/require-meta-charset": "error",
       "@html-eslint/require-meta-viewport": "error",
+      "custom/require-webmanifest": "error",
     },
   }
 );