analyze_date.dart

// Run this by `history > history.out && dart analyze_date.dart`.
// Or you can download and run this script by:
// ```
//   curl https://gist.githubusercontent.com/liyuqian/403400fddd0e2a8687dbd6e092f21d51/raw/analyze_date.dart > analyze_dart.dart && history > history.out && dart analyze_dart.dart
// ```
import 'dart:io';

void printAnalysis(String action, Set<String> dates) {
    final firstDate = DateTime.parse(dates.first);
    final lastDate = DateTime.parse(dates.last);

    int totalDays = lastDate.difference(firstDate).inDays + 1;

    print('Your first day of $action in `history` is ${dates.first}.');
    print('Your last day of $action `history` is ${dates.last}.');
    print('You have $action in ${dates.length} out of $totalDays days.');
    print('That\'s a rate of ${dates.length / totalDays}.');
    print("");
}

void processLines(List<String> lines) {
  Set<String> dates = {};
  Set<String> flutterDates = {};
  RegExp dateRegex = new RegExp(r"\d{4}-\d{2}-\d{2}");

    for (String line in lines) {
      if (line.trim().isEmpty) {
        continue;
      }
      final String date =dateRegex.stringMatch(line).toString();
      dates.add(date);
      if (line.contains('flutter run')) {
        flutterDates.add(date);
      }
    }

    printAnalysis('flutter run', flutterDates);
    printAnalysis('command line', dates);
  }

void main() {
  new File('history.out').readAsLines().then(processLines);
}