Archive merged branches

clean.dart

import 'dart:io';
import 'dart:async';

// Name for the master repo
var UPSTREAM = 'origin';

// Name of your fork
var REMOTE = 'vicb';

void main() {
  getBranches()
      .then((branches) {
        branches.forEach((branch) {
          if (branch == 'master') return;
          isMerged(branch: branch, into: '$UPSTREAM/master').then((merged) {
            if (merged) {
              bool archived = archiveBranch(branch);
              print(archived ?
                  'branch "$branch" merged and archived' :
                  'branch "$branch" merged, archive error');
            } else {
              print('branch "$branch" not merged');
            }
          });
        });
      },
      onError: (e) => print("Error $e"));
}

Future<List<String>> getBranches() {
  var completer = new Completer();

  try {
    Process.run('git', ['branch', '--list', '--no-color']).then((ProcessResult r) {
      if (r.exitCode == 0) {
        var branches = [];
        r.stdout.split('\n').forEach((String line) {
          if (line.isEmpty) return;
          branches.add(line.replaceAll('*', '').trim());
        });
        completer.complete(branches);
      } else {
        completer.completeError("git branch exit code: ${r.exitCode}");
      }
    });
  }   catch (e) {
    completer.completeError(e);
  }

  return completer.future;
}

Future<bool> isMerged({String branch, String into}) {
  var completer = new Completer();

  try {
    Process.run('git', ['cherry', into, branch]).then((ProcessResult r) {
      if (r.exitCode == 0) {
        var merged = r.stdout.split('\n').every((String line) {
          // The output is "- sha1" when the commit has been merged
          return line.isEmpty || line[0] == '-';
        });
        completer.complete(merged);
      } else {
        completer.completeError("git cherry exit code: ${r.exitCode}");
      }
    });
  }   catch (e) {
    completer.completeError(e);
  }

  return completer.future;
}

bool archiveBranch(String branch) {
  ProcessResult res;
  bool status = true;

  // Create a tag (archive the branch)
  res = Process.runSync('git', ['tag', 'archive/$branch', branch]);
  status = status && res.exitCode == 0;

  // Delete the local branch
  res = Process.runSync('git', ['branch', '-D', branch]);
  status = status && res.exitCode == 0;

  if (REMOTE != null && REMOTE.isNotEmpty) {
    // Delete the remote branch
    res = Process.runSync('git', ['push', REMOTE, ':$branch']);
    status = status && res.exitCode == 0;
  }

  return status;
}