WIP

src/runner/csv.js

@@ -0,0 +1,27 @@
+import { mkdirSync, writeFileSync } from 'fs';
+
+// Rows to a CSV file. CSV_SEPARATOR is ';' by default.
+// A cell is quoted only when it holds the separator, a quote or a newline —
+// this matches the shape of today's loket-report-generation-service output.
+// A quote inside a cell is doubled, per RFC 4180.
+
+const CSV_SEPARATOR = process.env.CSV_SEPARATOR || ';';
+const SHARE_DIR = process.env.SHARE_DIR || '/share';
+
+export function rowsToCsv(rows) {
+  return rows.map(row => row.map(escapeCell).join(CSV_SEPARATOR)).join('\n');
+}
+
+function escapeCell(cell) {
+  const s = String(cell ?? '');
+  return s.includes(CSV_SEPARATOR) || s.includes('"') || /[\n\r]/.test(s)
+    ? `"${s.replace(/"/g, '""')}"`
+    : s;
+}
+
+export function writeCsv(name, csv) {
+  mkdirSync(SHARE_DIR, { recursive: true });
+  const file = `${SHARE_DIR}/${name}`;
+  writeFileSync(file, csv, 'utf8');
+  return file;
+}