Update content & design (#75)

Reviewed-on: https://home.schmelczer.dev/git/git/andras/schmelczer-dev/pulls/75

scripts/check-no-em-dashes.mjs

@@ -0,0 +1,95 @@
+import { readdir, readFile, stat } from 'node:fs/promises';
+import path from 'node:path';
+
+const forbidden = String.fromCodePoint(0x2014);
+const root = process.cwd();
+
+const textExtensions = new Set([
+  '.astro',
+  '.css',
+  '.html',
+  '.js',
+  '.json',
+  '.md',
+  '.mjs',
+  '.ts',
+  '.txt',
+  '.vtt',
+  '.webmanifest',
+  '.xml',
+]);
+
+const roots = [
+  'src',
+  'public',
+  'scripts',
+  'README.md',
+  'package.json',
+  'astro.config.mjs',
+].map((entry) => path.resolve(root, entry));
+
+async function exists(filePath) {
+  try {
+    await stat(filePath);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+async function walk(entryPath) {
+  const entryStat = await stat(entryPath);
+  if (entryStat.isFile()) return [entryPath];
+
+  const entries = await readdir(entryPath, { withFileTypes: true });
+  const files = [];
+
+  for (const entry of entries) {
+    const fullPath = path.join(entryPath, entry.name);
+    if (entry.isDirectory()) {
+      files.push(...(await walk(fullPath)));
+    } else if (entry.isFile()) {
+      files.push(fullPath);
+    }
+  }
+
+  return files;
+}
+
+function lineAndColumn(text, index) {
+  const before = text.slice(0, index);
+  const lines = before.split('\n');
+  return {
+    line: lines.length,
+    column: lines.at(-1).length + 1,
+  };
+}
+
+const files = [];
+
+for (const entry of roots) {
+  if (!(await exists(entry))) continue;
+  files.push(...(await walk(entry)));
+}
+
+const textFiles = files.filter((file) => textExtensions.has(path.extname(file)));
+
+const failures = [];
+
+for (const file of textFiles) {
+  const text = await readFile(file, 'utf8');
+  let index = text.indexOf(forbidden);
+
+  while (index !== -1) {
+    const { line, column } = lineAndColumn(text, index);
+    failures.push(`${path.relative(root, file)}:${line}:${column}`);
+    index = text.indexOf(forbidden, index + forbidden.length);
+  }
+}
+
+if (failures.length > 0) {
+  console.error(`Em dashes are not allowed:\n${failures.join('\n')}`);
+  process.exit(1);
+}
+
+console.log('No em dashes found.');