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using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using LibGit2Sharp.Core;
namespace LibGit2Sharp
{
/// <summary>
/// A Commit
/// </summary>
public class Commit : GitObject
{
private readonly Repository repo;
private List<Commit> parents;
private Tree tree;
private readonly ObjectId treeId;
internal Commit(ObjectId id, ObjectId treeId, Repository repo) : base(id)
{
this.treeId = treeId;
this.repo = repo;
}
/// <summary>
/// Gets the commit message.
/// </summary>
public string Message { get; private set; }
/// <summary>
/// Gets the short commit message which is usually the first line of the commit.
/// </summary>
public string MessageShort { get; private set; }
/// <summary>
/// Gets the author of this commit.
/// </summary>
public Signature Author { get; private set; }
/// <summary>
/// Gets the committer.
/// </summary>
public Signature Committer { get; private set; }
/// <summary>
/// Gets the Tree associated to this commit.
/// </summary>
public Tree Tree { get { return tree ?? (tree = repo.Lookup<Tree>(treeId)); } }
/// <summary>
/// Gets the parents of this commit. This property is lazy loaded and can throw an exception if the commit no longer exists in the repo.
/// </summary>
public IEnumerable<Commit> Parents
{
get { return parents ?? (parents = RetrieveParentsOfCommit(Id.Oid)); }
}
private List<Commit> RetrieveParentsOfCommit(GitOid oid)
{
IntPtr obj;
var res = NativeMethods.git_object_lookup(out obj, repo.Handle, ref oid, GitObjectType.Commit);
Ensure.Success(res);
try
{
parents = new List<Commit>();
uint parentsCount = NativeMethods.git_commit_parentcount(obj);
for (uint i = 0; i < parentsCount; i++)
{
IntPtr parentCommit;
res = NativeMethods.git_commit_parent(out parentCommit, obj, i);
Ensure.Success(res);
parents.Add((Commit)CreateFromPtr(parentCommit, ObjectIdOf(parentCommit), repo));
}
}
finally
{
NativeMethods.git_object_close(obj);
}
return parents;
}
internal static Commit BuildFromPtr(IntPtr obj, ObjectId id, Repository repo)
{
var treeId =
new ObjectId((GitOid) Marshal.PtrToStructure(NativeMethods.git_commit_tree_oid(obj), typeof (GitOid)));
return new Commit(id, treeId, repo)
{
Message = NativeMethods.git_commit_message(obj).MarshallAsString(),
MessageShort = NativeMethods.git_commit_message_short(obj).MarshallAsString(),
Author = new Signature(NativeMethods.git_commit_author(obj)),
Committer = new Signature(NativeMethods.git_commit_committer(obj)),
};
}
}
}
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