Ajout de données météo

tools/lib/weather/frontmatter.js

@@ -0,0 +1,41 @@
+const fs = require("fs/promises");
+const YAML = require("yaml");
+
+const FRONTMATTER_PATTERN = /^---\n([\s\S]*?)\n---\n?/;
+
+async function readFrontmatter(filePath) {
+    const raw = await fs.readFile(filePath, "utf8");
+    const match = raw.match(FRONTMATTER_PATTERN);
+
+    if (!match) return null;
+
+    const frontmatterText = match[1];
+    const doc = YAML.parseDocument(frontmatterText);
+
+    if (doc.errors.length) {
+        const [error] = doc.errors;
+        throw new Error(`Invalid frontmatter in ${filePath}: ${error.message}`);
+    }
+
+    const body = raw.slice(match[0].length);
+
+    return { doc, body, frontmatterText };
+}
+
+async function writeFrontmatter(filePath, doc, body) {
+    const serialized = doc.toString().trimEnd();
+    const nextContent = `---\n${serialized}\n---\n${body}`;
+
+    await fs.writeFile(filePath, nextContent, "utf8");
+}
+
+function extractRawDate(frontmatterText) {
+    const match = frontmatterText.match(/^date:\s*(.+)$/m);
+    return match ? match[1].trim() : null;
+}
+
+module.exports = {
+    extractRawDate,
+    readFrontmatter,
+    writeFrontmatter,
+};