Add language prefix support to cached markdown rendering

Add language prefix parameter to cache functions Update
renderContentFile to handle language prefixes Add language prefix to
internal links in markdown Make template variables available to PHP
content files

app/cache.php

@@ -1,9 +1,9 @@
 <?php
 
-function getCachedMarkdown(string $filePath): ?string {
+function getCachedMarkdown(string $filePath, string $langPrefix = ''): ?string {
     $cacheDir = '/tmp/folderweb_cache';
     $mtime = filemtime($filePath);
-    $cacheKey = md5($filePath . $mtime);
+    $cacheKey = md5($filePath . $mtime . $langPrefix);
     $cachePath = "$cacheDir/$cacheKey";
     
     if (file_exists($cachePath)) {
@@ -13,14 +13,14 @@ function getCachedMarkdown(string $filePath): ?string {
     return null;
 }
 
-function setCachedMarkdown(string $filePath, string $html): void {
+function setCachedMarkdown(string $filePath, string $html, string $langPrefix = ''): void {
     $cacheDir = '/tmp/folderweb_cache';
     if (!is_dir($cacheDir)) {
         mkdir($cacheDir, 0755, true);
     }
     
     $mtime = filemtime($filePath);
-    $cacheKey = md5($filePath . $mtime);
+    $cacheKey = md5($filePath . $mtime . $langPrefix);
     $cachePath = "$cacheDir/$cacheKey";
     
     file_put_contents($cachePath, $html);

app/rendering.php

@@ -1,16 +1,19 @@
 <?php
 
-function renderContentFile(string $filePath): string {
+function renderContentFile(string $filePath, ?Context $ctx = null): string {
     $ext = pathinfo($filePath, PATHINFO_EXTENSION);
 
     ob_start();
     if ($ext === 'md') {
         require_once __DIR__ . '/cache.php';
-        $cached = getCachedMarkdown($filePath);
+        $langPrefix = $ctx ? $ctx->get('langPrefix', '') : '';
+        $cached = getCachedMarkdown($filePath, $langPrefix);
 
         if ($cached !== null) {
             echo $cached;
         } else {
+            // Update to newer versions before PHP 9.0 release
+            // Current versions have been patched for PHP 8.4+ compatibility
             if (!class_exists('Parsedown')) {
                 require_once __DIR__ . '/vendor/Parsedown.php';
             }
@@ -18,10 +21,25 @@ function renderContentFile(string $filePath): string {
                 require_once __DIR__ . '/vendor/ParsedownExtra.php';
             }
             $html = '<article>' . (new ParsedownExtra())->text(file_get_contents($filePath)) . '</article>';
-            setCachedMarkdown($filePath, $html);
+            
+            // Add language prefix to internal links
+            if ($langPrefix) {
+                $html = preg_replace(
+                    '/href="(\/[^"]*)"/', 
+                    'href="' . $langPrefix . '$1"', 
+                    $html
+                );
+            }
+            
+            setCachedMarkdown($filePath, $html, $langPrefix);
             echo $html;
         }
     } elseif (in_array($ext, ['html', 'php'])) {
+        // Make template variables available to PHP content files
+        if ($ctx !== null && $ext === 'php') {
+            $templateVars = Hooks::apply(Hook::TEMPLATE_VARS, [], $ctx);
+            extract($templateVars);
+        }
         include $filePath;
     }
     return ob_get_clean();
@@ -29,12 +47,12 @@ function renderContentFile(string $filePath): string {
 
 function renderTemplate(Context $ctx, string $content, int $statusCode = 200): void {
     global $GLOBALS;
-    
+
     // Get basic template vars
     $navigation = $ctx->navigation;
     $homeLabel = $ctx->homeLabel;
     $pageTitle = null;
-    
+
     // Let plugins add template variables
     $templateVars = Hooks::apply(Hook::TEMPLATE_VARS, [
         'content' => $content,
@@ -42,7 +60,7 @@ function renderTemplate(Context $ctx, string $content, int $statusCode = 200): v
         'homeLabel' => $homeLabel,
         'pageTitle' => $pageTitle
     ], $ctx);
-    
+
     extract($templateVars);
 
     http_response_code($statusCode);
@@ -59,7 +77,7 @@ function renderFile(Context $ctx, string $filePath): void {
     $ext = pathinfo($realPath, PATHINFO_EXTENSION);
 
     if (in_array($ext, CONTENT_EXTENSIONS)) {
-        $content = renderContentFile($realPath);
+        $content = renderContentFile($realPath, $ctx);
 
         $pageDir = dirname($realPath);
         $pageMetadata = loadMetadata($pageDir);
@@ -97,7 +115,7 @@ function renderFile(Context $ctx, string $filePath): void {
             'pageCssHash' => $pageCssHash,
             'socialImageUrl' => $socialImageUrl
         ], $ctx);
-        
+
         extract($templateVars);
 
         // Wrap content with page template
@@ -116,11 +134,11 @@ function renderFile(Context $ctx, string $filePath): void {
 function renderMultipleFiles(Context $ctx, array $files, string $pageDir): void {
     $content = '';
     foreach ($files as $file) {
-        $content .= renderContentFile($file);
+        $content .= renderContentFile($file, $ctx);
     }
 
     $pageMetadata = loadMetadata($pageDir);
-    
+
     // Load page-level plugins
     getPluginManager()->loadPagePlugins($pageMetadata);
 
@@ -154,7 +172,7 @@ function renderMultipleFiles(Context $ctx, array $files, string $pageDir): void
         'pageCssHash' => $pageCssHash,
         'socialImageUrl' => $socialImageUrl
     ], $ctx);
-    
+
     extract($templateVars);
 
     // Wrap content with page template