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using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using LibGit2Sharp.Core;
using LibGit2Sharp.Core.Handles;
namespace LibGit2Sharp
{
/// <summary>
/// A collection of commits in a <see cref = "Repository" />
/// </summary>
public class CommitCollection : IQueryableCommitCollection
{
private readonly Repository repo;
private IList<object> includedIdentifier = new List<object> { "HEAD" };
private IList<object> excludedIdentifier = new List<object>();
private readonly GitSortOptions sortOptions;
/// <summary>
/// Initializes a new instance of the <see cref = "CommitCollection" /> class.
/// The commits will be enumerated according in reverse chronological order.
/// </summary>
/// <param name = "repo">The repository.</param>
internal CommitCollection(Repository repo)
: this(repo, GitSortOptions.Time)
{
}
/// <summary>
/// Initializes a new instance of the <see cref = "CommitCollection" /> class.
/// </summary>
/// <param name = "repo">The repository.</param>
/// <param name = "sortingStrategy">The sorting strategy which should be applied when enumerating the commits.</param>
internal CommitCollection(Repository repo, GitSortOptions sortingStrategy)
{
this.repo = repo;
sortOptions = sortingStrategy;
}
/// <summary>
/// Gets the current sorting strategy applied when enumerating the collection
/// </summary>
public GitSortOptions SortedBy
{
get { return sortOptions; }
}
#region IEnumerable<Commit> Members
/// <summary>
/// Returns an enumerator that iterates through the collection.
/// </summary>
/// <returns>An <see cref = "IEnumerator{T}" /> object that can be used to iterate through the collection.</returns>
public IEnumerator<Commit> GetEnumerator()
{
if ((repo.Info.IsEmpty) && includedIdentifier.Any(o => PointsAtTheHead(o.ToString()))) // TODO: ToString() == fragile
{
return Enumerable.Empty<Commit>().GetEnumerator();
}
return new CommitEnumerator(repo, includedIdentifier, excludedIdentifier, sortOptions);
}
/// <summary>
/// Returns an enumerator that iterates through the collection.
/// </summary>
/// <returns>An <see cref = "IEnumerator" /> object that can be used to iterate through the collection.</returns>
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
#endregion
/// <summary>
/// Returns the list of commits of the repository matching the specified <paramref name = "filter" />.
/// </summary>
/// <param name = "filter">The options used to control which commits will be returned.</param>
/// <returns>A collection of commits, ready to be enumerated.</returns>
public ICommitCollection QueryBy(Filter filter)
{
Ensure.ArgumentNotNull(filter, "filter");
Ensure.ArgumentNotNull(filter.Since, "filter.Since");
Ensure.ArgumentNotNullOrEmptyString(filter.Since.ToString(), "filter.Since");
return new CommitCollection(repo, filter.SortBy)
{
includedIdentifier = ToList(filter.Since),
excludedIdentifier = ToList(filter.Until)
};
}
private static IList<object> ToList(object obj)
{
var list = new List<object>();
if (obj == null)
{
return list;
}
var types = new[]
{
typeof(string), typeof(ObjectId),
typeof(Commit), typeof(TagAnnotation),
typeof(Tag), typeof(Branch), typeof(DetachedHead),
typeof(Reference), typeof(DirectReference), typeof(SymbolicReference)
};
if (types.Contains(obj.GetType()))
{
list.Add(obj);
return list;
}
list.AddRange(((IEnumerable)obj).Cast<object>());
return list;
}
private static bool PointsAtTheHead(string shaOrRefName)
{
return ("HEAD".Equals(shaOrRefName, StringComparison.Ordinal) || "refs/heads/master".Equals(shaOrRefName, StringComparison.Ordinal));
}
/// <summary>
/// Stores the content of the <see cref = "Repository.Index" /> as a new <see cref = "Commit" /> into the repository.
/// </summary>
/// <param name = "message">The description of why a change was made to the repository.</param>
/// <param name = "author">The <see cref = "Signature" /> of who made the change.</param>
/// <param name = "committer">The <see cref = "Signature" /> of who added the change to the repository.</param>
/// <param name="amendPreviousCommit">True to amend the current <see cref="Commit"/> pointed at by <see cref="Repository.Head"/>, false otherwise.</param>
/// <returns>The generated <see cref = "Commit" />.</returns>
public Commit Create(string message, Signature author, Signature committer, bool amendPreviousCommit)
{
if (amendPreviousCommit && repo.Info.IsEmpty)
{
throw new LibGit2Exception("Can not amend anything. The Head doesn't point at any commit.");
}
GitOid treeOid;
Ensure.Success(NativeMethods.git_tree_create_fromindex(out treeOid, repo.Index.Handle));
var tree = repo.Lookup<Tree>(new ObjectId(treeOid));
var parents = RetrieveParentsOfTheCommitBeingCreated(repo, amendPreviousCommit);
return repo.ObjectDatabase.CreateCommit(message, author, committer, tree, parents, "HEAD");
}
private static IEnumerable<Commit> RetrieveParentsOfTheCommitBeingCreated(Repository repo, bool amendPreviousCommit)
{
if (amendPreviousCommit)
{
return repo.Head.Tip.Parents;
}
if (repo.Info.IsEmpty)
{
return Enumerable.Empty<Commit>();
}
return new[] { repo.Head.Tip };
}
private class CommitEnumerator : IEnumerator<Commit>
{
private readonly Repository repo;
private readonly RevWalkerSafeHandle handle;
private ObjectId currentOid;
public CommitEnumerator(Repository repo, IList<object> includedIdentifier, IList<object> excludedIdentifier, GitSortOptions sortingStrategy)
{
this.repo = repo;
int res = NativeMethods.git_revwalk_new(out handle, repo.Handle);
repo.RegisterForCleanup(handle);
Ensure.Success(res);
Sort(sortingStrategy);
Push(includedIdentifier);
Hide(excludedIdentifier);
}
#region IEnumerator<Commit> Members
public Commit Current
{
get { return repo.Lookup<Commit>(currentOid); }
}
object IEnumerator.Current
{
get { return Current; }
}
public bool MoveNext()
{
GitOid oid;
int res = NativeMethods.git_revwalk_next(out oid, handle);
if (res == (int)GitErrorCode.GIT_EREVWALKOVER)
{
return false;
}
Ensure.Success(res);
currentOid = new ObjectId(oid);
return true;
}
public void Reset()
{
NativeMethods.git_revwalk_reset(handle);
}
#endregion
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
private void Dispose(bool disposing)
{
handle.SafeDispose();
}
private delegate int HidePushSignature(RevWalkerSafeHandle handle, ref GitOid oid);
private void InternalHidePush(IList<object> identifier, HidePushSignature hidePush)
{
IEnumerable<ObjectId> oids = RetrieveCommitOids(identifier).TakeWhile(o => o != null);
foreach (ObjectId actedOn in oids)
{
GitOid oid = actedOn.Oid;
int res = hidePush(handle, ref oid);
Ensure.Success(res);
}
}
private void Push(IList<object> identifier)
{
InternalHidePush(identifier, NativeMethods.git_revwalk_push);
}
private void Hide(IList<object> identifier)
{
if (identifier == null)
{
return;
}
InternalHidePush(identifier, NativeMethods.git_revwalk_hide);
}
private void Sort(GitSortOptions options)
{
NativeMethods.git_revwalk_sorting(handle, options);
}
private ObjectId DereferenceToCommit(string identifier)
{
// TODO: Should we check the type? Git-log allows TagAnnotation oid as parameter. But what about Blobs and Trees?
GitObject commit = repo.Lookup(identifier, GitObjectType.Any, LookUpOptions.ThrowWhenNoGitObjectHasBeenFound | LookUpOptions.DereferenceResultToCommit);
return commit != null ? commit.Id : null;
}
private IEnumerable<ObjectId> RetrieveCommitOids(object identifier)
{
if (identifier is string)
{
yield return DereferenceToCommit(identifier as string);
yield break;
}
if (identifier is ObjectId)
{
yield return DereferenceToCommit(((ObjectId)identifier).Sha);
yield break;
}
if (identifier is Commit)
{
yield return ((Commit)identifier).Id;
yield break;
}
if (identifier is TagAnnotation)
{
yield return DereferenceToCommit(((TagAnnotation)identifier).Target.Id.Sha);
yield break;
}
if (identifier is Tag)
{
yield return DereferenceToCommit(((Tag)identifier).Target.Id.Sha);
yield break;
}
if (identifier is Branch)
{
var branch = (Branch)identifier;
Ensure.GitObjectIsNotNull(branch.Tip, branch.CanonicalName);
yield return branch.Tip.Id;
yield break;
}
if (identifier is Reference)
{
yield return DereferenceToCommit(((Reference)identifier).CanonicalName);
yield break;
}
if (identifier is IEnumerable)
{
var enumerable = (IEnumerable)identifier;
foreach (object entry in enumerable)
{
foreach (ObjectId oid in RetrieveCommitOids(entry))
{
yield return oid;
}
}
yield break;
}
throw new LibGit2Exception(string.Format(CultureInfo.InvariantCulture, "Unexpected kind of identifier '{0}'.", identifier));
}
}
}
}
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