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using System;
using LibGit2Sharp.Core;
namespace LibGit2Sharp
{
/// <summary>
/// A Repository is the primary interface into a git repository
/// </summary>
public class Repository : IDisposable
{
private readonly BranchCollection branches;
private readonly CommitCollection commits;
private readonly RepositorySafeHandle handle;
private readonly Index index;
private readonly ReferenceCollection refs;
private readonly TagCollection tags;
private RepositoryInformation info;
private readonly bool isBare;
/// <summary>
/// Initializes a new instance of the <see cref = "Repository" /> class.
/// <para>For a standard repository, <paramref name="path"/> should point to the ".git" folder. For a bare repository, <paramref name="path"/> should directly point to the repository folder.</para>
/// </summary>
/// <param name = "path">The path to the git repository to open.</param>
public Repository(string path)
{
Ensure.ArgumentNotNullOrEmptyString(path, "path");
var res = NativeMethods.git_repository_open(out handle, PosixPathHelper.ToPosix(path));
Ensure.Success(res);
isBare = NativeMethods.git_repository_is_bare(handle);
if (!isBare)
{
index = new Index(this);
}
commits = new CommitCollection(this);
refs = new ReferenceCollection(this);
branches = new BranchCollection(this);
tags = new TagCollection(this);
}
internal RepositorySafeHandle Handle
{
get { return handle; }
}
/// <summary>
/// Shortcut to return the reference to HEAD
/// </summary>
/// <returns></returns>
public Branch Head
{
get
{
Reference headRef = Refs["HEAD"];
if (Info.IsEmpty)
{
return new Branch(headRef.TargetIdentifier, null, this);
}
return Refs.Resolve<Branch>(headRef.ResolveToDirectReference().CanonicalName);
}
}
/// <summary>
/// Gets the index.
/// </summary>
public Index Index
{
get { return index; }
}
/// <summary>
/// Lookup and enumerate references in the repository.
/// </summary>
public ReferenceCollection Refs
{
get { return refs; }
}
/// <summary>
/// Lookup and enumerate commits in the repository.
/// Iterating this collection directly starts walking from the HEAD.
/// </summary>
public IQueryableCommitCollection Commits
{
get { return commits; }
}
/// <summary>
/// Lookup and enumerate branches in the repository.
/// </summary>
public BranchCollection Branches
{
get { return branches; }
}
/// <summary>
/// Lookup and enumerate tags in the repository.
/// </summary>
public TagCollection Tags
{
get { return tags; }
}
/// <summary>
/// Provides high level information about this repository.
/// </summary>
public RepositoryInformation Info
{
get { return info ?? (info = new RepositoryInformation(this, isBare)); }
}
#region IDisposable Members
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
protected virtual void Dispose(bool disposing)
{
if (handle != null && !handle.IsInvalid)
{
handle.Dispose();
}
if (index != null)
{
index.Dispose();
}
}
#endregion
/// <summary>
/// Tells if the specified sha exists in the repository.
///
/// Exceptions:
/// ArgumentException
/// ArgumentNullException
/// </summary>
/// <param name = "sha">The sha.</param>
/// <returns></returns>
public bool HasObject(string sha)
{
Ensure.ArgumentNotNullOrEmptyString(sha, "sha");
var id = new ObjectId(sha);
var odb = NativeMethods.git_repository_database(handle);
var oid = id.Oid;
return NativeMethods.git_odb_exists(odb, ref oid);
}
/// <summary>
/// Init a repo at the specified <paramref name="path"/>.
/// </summary>
/// <param name = "path">The path to the working folder when initializing a standard ".git" repository. Otherwise, when initializing a bare repository, the path to the expected location of this later.</param>
/// <param name = "isBare">true to initialize a bare repository. False otherwise, to initialize a standard ".git" repository.</param>
/// <returns>Path the git repository.</returns>
public static string Init(string path, bool isBare = false)
{
Ensure.ArgumentNotNullOrEmptyString(path, "path");
RepositorySafeHandle repo;
var res = NativeMethods.git_repository_init(out repo, PosixPathHelper.ToPosix(path), isBare);
Ensure.Success(res);
string normalizedPath = NativeMethods.git_repository_path(repo, GitRepositoryPathId.GIT_REPO_PATH).MarshallAsString();
repo.Dispose();
return PosixPathHelper.ToNative(normalizedPath);
}
/// <summary>
/// Try to lookup an object by its <see cref = "ObjectId" /> and <see cref = "GitObjectType" />. If no matching object is found, null will be returned.
/// </summary>
/// <param name = "id">The id to lookup.</param>
/// <param name = "type">The kind of GitObject being looked up</param>
/// <returns>The <see cref = "GitObject" /> or null if it was not found.</returns>
public GitObject Lookup(ObjectId id, GitObjectType type = GitObjectType.Any)
{
Ensure.ArgumentNotNull(id, "id");
var oid = id.Oid;
IntPtr obj;
var res = NativeMethods.git_object_lookup(out obj, handle, ref oid, type);
if (res == (int)GitErrorCode.GIT_ENOTFOUND || res == (int)GitErrorCode.GIT_EINVALIDTYPE)
{
return null;
}
Ensure.Success(res);
return GitObject.CreateFromPtr(obj, id, this);
}
/// <summary>
/// Try to lookup an object by its sha or a reference canonical name and <see cref="GitObjectType"/>. If no matching object is found, null will be returned.
/// </summary>
/// <param name = "shaOrReferenceName">The sha or reference canonical name to lookup.</param>
/// <param name = "type">The kind of <see cref="GitObject"/> being looked up</param>
/// <returns>The <see cref = "GitObject" /> or null if it was not found.</returns>
public GitObject Lookup(string shaOrReferenceName, GitObjectType type = GitObjectType.Any)
{
ObjectId id = ObjectId.CreateFromMaybeSha(shaOrReferenceName);
if (id != null)
{
return Lookup(id, type);
}
var reference = Refs[shaOrReferenceName];
if (!IsReferencePeelable(reference))
{
return null;
}
return Lookup(reference.ResolveToDirectReference().TargetIdentifier, type);
}
private static bool IsReferencePeelable(Reference reference)
{
return reference != null && ((reference is DirectReference) || (reference is SymbolicReference && ((SymbolicReference)reference).Target != null));
}
}
}
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