appendLine method
Implementation
Future<void> appendLine(
String filePath, List<String> linesToAdd, String appendAfterContainString,
{bool isAfter = true}) async {
final file = File(filePath);
final lines = await file.readAsLines();
bool found = false;
for (int i = 0; i < lines.length; i++) {
if (lines[i].contains(appendAfterContainString) && !found) {
if (isAfter) {
lines.insertAll(i + 1, linesToAdd);
} else {
lines.insertAll(i - 1, linesToAdd);
}
found = true;
break;
}
}
if (!found) {
return;
}
await file.writeAsString(lines.join('\n'));
}