Libgit2sharp - equivalent to "git describe --tag"

userktq 0
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So I am working on a system to determine the changes since the last tag. Git offers the git describe --tag command which will:

The command finds the most recent tag that is reachable from a commit.

https://git-scm.com/docs/git-describe

However, I am using Libgit2sharp to do some automation and I am looking for the equivalent functionality however I am not having much luck.

I tried:

var result = repo.Refs.ReachableFrom(
  repo.Refs.Where(r => r.IsTag),
  new[] { repo.Head.Tip });

But this didn't yield any results (I am pretty use I am doing it wrong)

libgit2sharp git c#
1 Answers

This is my current naive approach. I am open to criticism or better solutions. The commit log is ordered and therefore I just find the nearest tag targeting a commit and use that.

In my case I always using HEAD as I am looking for the last tag at the tip of HEAD.

Tag? GetLastTag(Repository repo)
{
    var commitsToHead = repo.Head.Commits;
    var tagsOnCommits = repo.Tags.Where(t => t.Target.GetType() == typeof(Commit)).ToList();

    foreach (var commit in commitsToHead)
    {
        var foundTags = tagsOnCommits.Where(x => x.Target.Peel<Commit>().Id == commit.Id).ToArray();
        if (foundTags.Length <= 0)
        {
            continue;
        }

        if (foundTags.Length > 1)
        {
            Console.WriteLine($"Found more than one tag for the commit {commit}");
        }

        return foundTags[0];
    }

    return null;
}
userktq0
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