static public LoadFromUrlResult LoadFromUrl(string sourceUrl)
{
var parsedUrl = ParseGitHubObjectUrl(sourceUrl);
if (parsedUrl == null)
{
return new LoadFromUrlResult
{
Error = "Failed to parse string '" + sourceUrl + "' as GitHub object URL.",
}
}
;
var refLooksLikeCommit = Regex.IsMatch(parsedUrl.@ref, "[A-Fa-f0-9]{40}");
var tempWorkingDirectory = Kalmit.Filesystem.CreateRandomDirectoryInTempDirectory();
var gitRepositoryLocalDirectory = Path.Combine(tempWorkingDirectory, "git-repository");
// https://github.com/libgit2/libgit2sharp/wiki/git-clone
Repository.Clone(parsedUrl.repository, gitRepositoryLocalDirectory, new CloneOptions {
Checkout = false
});
Composition.TreeComponent literalNodeObject = null;
using (var gitRepository = new Repository(gitRepositoryLocalDirectory))
{
var commit = gitRepository.Lookup(parsedUrl.@ref) as Commit;
if (commit == null)
{
return new LoadFromUrlResult
{
Error = "I did not find the commit for ref '" + parsedUrl.@ref + "'.",
}
}
;
var pathNodesNames = parsedUrl.path.Split('/', StringSplitOptions.RemoveEmptyEntries);
var findGitObjectResult =
FindGitObjectAtPath(commit.Tree, pathNodesNames);
var linkedObject = findGitObjectResult?.Success;
if (linkedObject == null)
{
return new LoadFromUrlResult
{
Error = "I did not find an object at path '" + parsedUrl.path + "'.",
}
}
;
static public LoadFromUrlResult LoadFromUrl(string sourceUrl)
{
var parsedUrl = ParseGitHubObjectUrl(sourceUrl);
if (parsedUrl == null)
return new LoadFromUrlResult
{
Error = "Failed to parse string '" + sourceUrl + "' as GitHub object URL.",
};
var refLooksLikeCommit = Regex.IsMatch(parsedUrl.@ref, "[A-Fa-f0-9]{40}");
var tempWorkingDirectory = Kalmit.Filesystem.CreateRandomDirectoryInTempDirectory();
var gitRepositoryLocalDirectory = Path.Combine(tempWorkingDirectory, "git-repository");
// https://github.com/libgit2/libgit2sharp/wiki/git-clone
Repository.Clone(parsedUrl.repository, gitRepositoryLocalDirectory, new CloneOptions { Checkout = false });
Composition.TreeComponent literalNodeObject = null;
string urlInCommit = null;
string urlInFirstParentCommitWithSameValueAtThisPath = null;
(string hash, CommitContent content)? rootCommit = null;
(string hash, CommitContent content)? firstParentCommitWithSameTree = null;
using (var gitRepository = new Repository(gitRepositoryLocalDirectory))
{
var commit = gitRepository.Lookup(parsedUrl.@ref) as Commit;
if (commit == null)
return new LoadFromUrlResult
{
Error = "I did not find the commit for ref '" + parsedUrl.@ref + "'.",
};
urlInCommit = BackToUrl(parsedUrl.WithRef(commit.Sha));
rootCommit = GetCommitHashAndContent(commit);
var pathNodesNames = parsedUrl.path.Split('/', StringSplitOptions.RemoveEmptyEntries);
var findGitObjectResult =
FindGitObjectAtPath(commit.Tree, pathNodesNames);
var linkedObject = findGitObjectResult?.Success;
if (linkedObject == null)
return new LoadFromUrlResult
{
Error = "I did not find an object at path '" + parsedUrl.path + "'.",
};
IEnumerable<Commit> traceBackTreeParents()
{
var queue = new Queue<Commit>();
queue.Enqueue(commit);
while (queue.TryDequeue(out var currentCommit))
{
yield return currentCommit;
foreach (var parent in currentCommit.Parents)
{
if (FindGitObjectAtPath(parent.Tree, pathNodesNames)?.Success?.Sha != linkedObject?.Sha)
continue;
queue.Enqueue(parent);
}
}
}
firstParentCommitWithSameTree =
GetCommitHashAndContent(traceBackTreeParents().OrderBy(commit => commit.Author.When).First());
urlInFirstParentCommitWithSameValueAtThisPath =
BackToUrl(parsedUrl.WithRef(firstParentCommitWithSameTree.Value.hash));
