updateLineInFile function
Implementation
Future updateLineInFile(
String filePath, String lineStartsWith, String replaceBy) async {
final lines = await utf8.decoder
.bind(File(filePath).openRead())
.transform(const LineSplitter())
.toList();
final idx = lines.indexWhere((line) {
return line.startsWith(lineStartsWith);
});
print('old "${lines[idx]}" => new : "$replaceBy"');
lines[idx] = replaceBy;
return File(filePath).writeAsString(lines.join('\n'));
}