added terminal interface as default. old website as no-js fallback

terminal/api/page.php

@@ -0,0 +1,53 @@
+<?php
+declare(strict_types=1);
+
+require __DIR__ . '/_bootstrap.php';
+
+$p = $_GET['p'] ?? '';
+if (!is_string($p)) {
+    json_out(['error' => 'Invalid page'], 400);
+}
+
+$slug = trim($p);
+$slug = ltrim($slug, '/');
+$slug = preg_replace('/\?.*$/', '', $slug) ?? $slug;
+
+if ($slug === '' || !preg_match('/^[A-Za-z0-9][A-Za-z0-9_-]*$/', $slug)) {
+    json_out(['error' => 'Invalid page'], 400);
+}
+
+if (preg_match('/^success\d+$/', $slug) === 1) {
+    json_out(['error' => 'Not found'], 404);
+}
+
+$file = $rootDir . '/articles/' . $slug . '.md';
+if (!is_file($file)) {
+    json_out(['error' => 'Not found'], 404);
+}
+
+$md = file_get_contents($file);
+if ($md === false) {
+    json_out(['error' => 'Failed to read page'], 500);
+}
+
+$parsedownPath = $rootDir . '/parsedown-1.7.3/Parsedown.php';
+$extraPath = $rootDir . '/parsedown-extra-0.7.1/ParsedownExtra.php';
+
+if (is_file($parsedownPath)) {
+    require_once $parsedownPath;
+}
+if (is_file($extraPath)) {
+    require_once $extraPath;
+}
+
+$html = '';
+if (class_exists('ParsedownExtra')) {
+    $pd = new ParsedownExtra();
+    $html = $pd->text($md);
+}
+
+json_out([
+    'slug' => $slug,
+    'markdown' => $md,
+    'html' => $html,
+]);