Export CSV/PDF

lib/shared/csv.dart

@@ -0,0 +1,24 @@
+// lib/shared/csv.dart
+class CsvBuilder {
+  final StringBuffer _buf = StringBuffer();
+  final String delimiter;
+  final String eol;
+
+  CsvBuilder({this.delimiter = ';', this.eol = '\n'});
+
+  static String _escape(String? v, String delimiter) {
+    final s = v ?? '';
+    final mustQuote =
+        s.contains(delimiter) || s.contains('\n') || s.contains('"');
+    var out = s.replaceAll('"', '""');
+    return mustQuote ? '"$out"' : out;
+  }
+
+  void addRow(Iterable<dynamic> cols) {
+    _buf.writeln(
+        cols.map((c) => _escape(c?.toString(), delimiter)).join(delimiter));
+  }
+
+  @override
+  String toString() => _buf.toString();
+}