"Merge tag '1.1.0' into support/1.0" is not recognized as merge commit

[johannesegger]

When using git flow to merge a release branch back into a support branch it generates a commit message

Merge tag '1.1.0' into support/1.0

which is not recognized by gitversion as a valid commit message. When I ammend the commit to change "tag" to "branch" it works.

Why not use

git cat-file -p $gitsha

and count the number of parents to detect a merge commit. If there are more than one it is a merge commit. That would be more robust

C:\Users\egger\Workspace\GitVersionTest [support/1.0]> git cat-file -p 564cf5140fa30e85b07ba2f61dac70065eab93ca
tree 4b825dc642cb6eb9a060e54bf8d69288fbee4904
parent 7505a41a091f33e859c2311f5d76e7309a0240ff
parent fe420d45e9c69e68cf19014d7e1b5c112716091b
author Johannes Egger <eggerjohansi@gmail.com> 1425909409 +0100
committer Johannes Egger <eggerjohansi@gmail.com> 1425909409 +0100

Merge tag '1.1.0' into support/1.0

[JakeGinnivan]

I see you have submitted a PR already, but a more flexible option I see would be to do something like this though:

config.Repository
  .Commits
  .Where(c => c.Parents.Count > 1)
  .Select(c => c.Message.Split('/', '-', '\'', '"', ' '))
  .SelectMany(parts => {
    foreach (var part in parts) {
      SemanticVersion version;
      if (SemanticVersion.TryParse(part, out version)) {
        yield return version;
      }
    }
  });

Which basically will find all merge commits (maybe a commit query to find all commits with multiple parents would be more efficient, @nulltoken ?) then split the commit message up and try and find a version number in the merge commit. If it finds one it can return it. Thoughts on doing something like this instead of just chaining more if's?

[johannesegger]

I'll have a look at the 3.0 branch and get you some feedback

[johannesegger]

Turned out easy.

        static bool Inner(Commit mergeCommit, out string versionPart)
        {
            if (mergeCommit.Parents.Count() < 2)
            {
                versionPart = null;
                return false;
            }

            var version = mergeCommit
                .Message.Split('/', '-', '\'', '"', ' ')
                .Select(part =>
                {
                    SemanticVersion v;
                    return SemanticVersion.TryParse(part, "", out v) ? v : null;
                }).FirstOrDefault(v => v != null)
                ;

            versionPart = version!=null ? version.ToString() : null;

            return versionPart != null;
        }