IEnumerable<IChange> GetAllChanges(string fromCommit, GitBasedFileSystemSnapshot toSnapshot, string[] paths)
{
var currentCommit = toSnapshot.Commit;
var currentSnapshot = toSnapshot;
// empty path filter => result is empty
if (paths != null && !paths.Any())
{
yield break;
}
// paths refers to file in the snapshot, we need to "translate" the paths to the paths in the git repository
// assumes all paths are rooted
var pathFilter = paths?.Select(p => GitBasedFileSystemSnapshot.SnapshotDirectoryName + p + FilePropertiesFile.FileNameSuffix).ToArray();
while (currentCommit.Sha != fromCommit)
{
var parentCommit = GetParentSnapshotCommit(currentCommit);
// parent commit is initial commit
if (parentCommit.Sha == m_Repository.GetInitialCommit().Sha)
{
var treeChanges = m_Repository.Diff.Compare<TreeChanges>(parentCommit.Tree, currentCommit.Tree, pathFilter, null, new CompareOptions() { IncludeUnmodified = false });
// build changes
foreach (var change in GetChanges(treeChanges, null, currentSnapshot))
{
yield return change;
}
// there won't be any commit after this (we already reached the inital commit)
// => abort the loop
break;
}
else
{
var parentSnapshot = GetSnapshot(parentCommit.Sha);
var treeChanges = m_Repository.Diff.Compare<TreeChanges>(parentCommit.Tree, currentCommit.Tree, pathFilter, null, new CompareOptions() { IncludeUnmodified = false });
// build changes
foreach(var change in GetChanges(treeChanges, parentSnapshot, currentSnapshot))
{
yield return change;
}
currentCommit = parentCommit;
currentSnapshot = parentSnapshot;
}
}
}
IEnumerable<IChange> GetChanges(TreeChanges treeChanges, GitBasedFileSystemSnapshot fromSnapshot, GitBasedFileSystemSnapshot toSnapshot)
{
foreach (var treeChange in treeChanges.Where(c => !IgnoreTreeChange(c)))
{
switch (treeChange.Status)
{
case ChangeKind.Unmodified:
throw new InvalidOperationException("Unmodified changes should have been filtered out");
case ChangeKind.Modified:
var fromFile = fromSnapshot.GetFileForGitPath(treeChange.Path);
var toFile = toSnapshot.GetFileForGitPath(treeChange.Path);
yield return new Change(ChangeType.Modified, fromFile.ToReference(), toFile.ToReference());
break;
case ChangeKind.Added:
yield return new Change(ChangeType.Added, null, toSnapshot.GetFileForGitPath(treeChange.Path).ToReference());
break;
case ChangeKind.Deleted:
yield return new Change(ChangeType.Deleted, fromSnapshot.GetFileForGitPath(treeChange.Path).ToReference(), null);
break;
default:
throw new NotImplementedException();
}
}
}
IEnumerable<ChangeList> GetChangeLists(string fromCommit, GitBasedFileSystemSnapshot toSnapshot, string[] paths)
{
var changeLists = GetAllChanges(fromCommit, toSnapshot, paths)
.GroupBy(change => change.Path, StringComparer.InvariantCultureIgnoreCase)
.Select(group => new ChangeList(group.Reverse()));
return changeLists;
}
