static string CharacterizeChange(Ref a, Ref b, Ref[] oldRefs)
{
if (a == null)
{
var m = GetBestMergeBase(b, oldRefs);
if (m.t == null)
return "{0}/{1}: {2} (new branch) {3}".F(b.Alias, b.Name, b.ShortSha, Shortener.Shorten(a, b));
if (m.u == 1)
return "{0}/{1}: {2} -> {3} (new branch; 1 new commit) {4} {5}".F(
b.Alias, b.Name, m.t.ShortSha, b.ShortSha, Shortener.Shorten(m.t, b), Git.GetMessage(b));
return "{0}/{1}: {2} -> {3} (new branch; {4} new commits) {5}".F(
b.Alias, b.Name, m.t.ShortSha, b.ShortSha, m.u, Shortener.Shorten(m.t, b));
}
if (b == null)
return "{0}/{1}: {2} -> (deleted)".F(a.Alias, a.Name, a.ShortSha);
// the meaty case: this branch existed,
{
var basicReport = "{0}/{1}: {2} -> {3}".F(a.Alias, a.Name, a.ShortSha, b.ShortSha);
var m = Git.GetMergeBase(a, b);
if (m.Sha == "")
return basicReport;
if (m.Sha == a.Sha)
{
// fast-forward. todo: find out if anyone else had these commits first.
var newCommits = Git.GetCommitsBetween(m, b).Length;
//if we have a prevOwner
var prevOwner = oldRefs.FirstOrDefault(q => q.Sha == b.Sha);
if (prevOwner != null)
{
if(newCommits == 1)
return "{0} (1 new commit from {1}/{2}) {3} {4}".F(basicReport,
prevOwner.Alias, prevOwner.Name, Shortener.Shorten(null, b), Git.GetMessage(b));
else
return "{0} ({1} new commits from {2}/{3}) {4}".F(basicReport, newCommits,
prevOwner.Alias, prevOwner.Name, Shortener.Shorten(a, b));
}
//otherwise
if (newCommits == 1)
return "{0} (1 new commit) {1} {2}".F(basicReport , Shortener.Shorten(null, b), Git.GetMessage(b));
return "{0} ({1} new commits) {2}".F(basicReport, newCommits, Shortener.Shorten(a, b));
}
if (m.Sha == b.Sha)
{
// rewind. note; existence of these commits in some other tree is irrelevant.
var newCommits = Git.GetCommitsBetween(m, a);
if (newCommits.Length == 1)
return "{0} (1 commit removed)".F(basicReport);
else
return "{0} ({1} commits removed)".F(basicReport, newCommits.Length);
}
if (Git.GetCommitsBetween(m, a).Length == 1 &&
Git.GetCommitsBetween(m, b).Length == 1)
{
return "{0} (amended) {1} {2}".F(basicReport, Shortener.Shorten(m, b), Git.GetMessage(b));
}
return "{0} {1}".F(basicReport, Shortener.Shorten(a, b));
}
}
