check_git_repos.dart

import 'dart:io';

const String onBranch = 'On branch ';
const String upToDate = 'Your branch is up to date with \'';
const String behind = 'Your branch is behind \'';
const String behindMiddle = '\' by ';
const String behindEnd = ' commits, and can be fast-forwarded.';
const String nothingToCommit = 'nothing to commit, working tree clean';
const String unstagedChanges = 'Changes not staged for commit:';
const String noCommits = 'No commits yet';

void main() {
  Directory dir = Directory('<directory>');
  for (FileSystemEntity file in dir.listSync()) {
    if (file is File) {
      print('File: ${file.path}');
    } else if (file is Directory) {
      if (!file.listSync().any((e) => e.path.endsWith('.git'))) {
        print('directory ${file.path} has no git repo');
        continue;
      }
      List<String> gitStatus =
          Process.runSync('git', ['status'], workingDirectory: file.path)
              .stdout
              .replaceAll('\r\n', '\n')
              .split('\n');
      String branchNameLine = gitStatus.first;
      if (!branchNameLine.startsWith(onBranch)) {
        print(
            'Failed to parse branch name line for directory ${file.path}: $branchNameLine');
        continue;
      }
      String branch = branchNameLine.substring(onBranch.length);
      if (branch != 'main' && branch != 'master') {
        print('directory ${file.path} is on branch $branch');
      }
      String mainStatusLine = gitStatus[1];
      if (mainStatusLine.startsWith(behind)) {
        int endingQuote = mainStatusLine.lastIndexOf('\'');
        String remoteName =
            mainStatusLine.substring(behind.length, endingQuote);
        int? commitCount = int.tryParse(mainStatusLine.substring(
            endingQuote + behindMiddle.length,
            mainStatusLine.lastIndexOf(behindEnd)));
        if (commitCount == null) {
          print(
              'Failed to parse main status line for directory ${file.path}: $mainStatusLine');
          continue;
        }
        print(
            'directory ${file.path} is behind remote \'$remoteName\' by $commitCount commits');
        continue;
      }
      if (mainStatusLine == '') {
        String noCommitsLine = gitStatus[2];
        if (noCommitsLine != noCommits) {
          print(
              'Failed to parse no commits line for directory ${file.path}: $noCommitsLine');
              continue;
        }
        print('directory ${file.path} has no commits');
        continue;
      }
      if (mainStatusLine == nothingToCommit || mainStatusLine == unstagedChanges) {
        print('directory ${file.path} has no remote');
        continue;
      }
      if (!mainStatusLine.startsWith(upToDate)) {
        print(
            'Failed to parse main status line for directory ${file.path}: $mainStatusLine');
        continue;
      }
      String workingTreeStatusLine = gitStatus[3];
      if (workingTreeStatusLine == unstagedChanges) {
        print('directory ${file.path} has unstaged changes');
        continue;
      }
      if (workingTreeStatusLine != nothingToCommit) {
        print(
            'Failed to parse working tree status line: $workingTreeStatusLine');
        continue;
      }
    }
  }
}