Dart function to increment the version and build numbers of flutter apps. Built by Joe Muller and chat GPT.

increment_version.dart

import 'dart:developer';
import 'dart:io';

import 'package:yaml/yaml.dart';
import 'package:yaml_writer/yaml_writer.dart';

/// Run by calling dart increment_version.dart major/minor/patch
void main(List<String> args) {
  // Use the provided argument to determine the version type to increment,
  // or default to minor if no argument is provided
  var versionType = args.isEmpty ? 'minor' : args[0];

  var yamlWriter = YAMLWriter(addQuotes: false);

  // Read the pubspec.yaml file
  var pubspec = File('pubspec.yaml').readAsStringSync();

  // Parse the pubspec.yaml file into a Map
  var pubspecMap = loadYaml(pubspec);

  var data = {};
  data.addAll(pubspecMap);

  // Extract the current version number
  var currentVersion = pubspecMap['version'];

  var versionCode = currentVersion.split('+')[0];
  var buildNumber = currentVersion.split('+')[1];

  var newVersion = versionCode.split('.');

  if (versionType == 'major') {
    newVersion[0] = (int.parse(versionCode[0]) + 1).toString();
    newVersion[1] = '0';
    newVersion[2] = '0';
  } else if (versionType == 'minor') {
    newVersion[1] = (int.parse(newVersion[1]) + 1).toString();
    newVersion[2] = '0';
  } else if (versionType == 'patch') {
    newVersion[2] = (int.parse(newVersion[2]) + 1).toString();
  } else {
    log('Invalid version type "$versionType". Please specify either "major", "minor", or "patch".');
    return;
  }
  
  // Update the pubspec.yaml file with the new version number
  data['version'] = '${newVersion.join('.')}+${(int.parse(buildNumber) + 1)}';
  
  // Use the write method of the YAMLWriter object to convert the Map to a YAML string
  var yamlString = yamlWriter.write(data);

  File('pubspec.yaml').writeAsStringSync(yamlString);
}

String getBuildNumber(String version) {
  var versionParts = version.split('.');
  if (versionParts.length > 3) {
    var buildNumber = versionParts[3];
    if (buildNumber.startsWith('+')) {
      return buildNumber.substring(1);
    }
  }
  return '';
}