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src/GitHub.Api/Application/ApiClient.cs

@@ -469,20 +469,20 @@ private GitHubUser GetValidatedGitHubUser()
         }
     }
 
-    class GitHubHostMeta
+    public class GitHubHostMeta
     {
         public bool VerifiablePasswordAuthentication { get; set; }
         public string GithubServicesSha { get; set; }
         public string InstalledVersion { get; set; }
     }
 
-    class GitHubUser
+    public class GitHubUser
     {
         public string Name { get; set; }
         public string Login { get; set; }
     }
 
-    class GitHubRepository
+    public class GitHubRepository
     {
         public string Name { get; set; }
         public string CloneUrl { get; set; }

src/GitHub.Api/Application/IApiClient.cs

@@ -2,7 +2,7 @@
 
 namespace GitHub.Unity
 {
-    interface IApiClient
+    public interface IApiClient
     {
         HostAddress HostAddress { get; }
         void CreateRepository(string name, string description, bool isPrivate,

src/GitHub.Api/Application/Organization.cs

@@ -1,8 +1,8 @@
 namespace GitHub.Unity
 {
-    class Organization
+    public class Organization
     {
         public string Name { get; set; }
         public string Login { get; set; }
     }
-}
+}

src/GitHub.Api/Cache/CacheContainer.cs

@@ -90,6 +90,7 @@ public void Dispose()
 
         public IBranchCache BranchCache { get { return (IBranchCache)caches[CacheType.Branches].Value; } }
         public IGitLogCache GitLogCache { get { return (IGitLogCache)caches[CacheType.GitLog].Value; } }
+        public IGitFileLogCache GitFileLogCache { get { return (IGitFileLogCache)caches[CacheType.GitFileLog].Value; } }
         public IGitAheadBehindCache GitTrackingStatusCache { get { return (IGitAheadBehindCache)caches[CacheType.GitAheadBehind].Value; } }
         public IGitStatusCache GitStatusEntriesCache { get { return (IGitStatusCache)caches[CacheType.GitStatus].Value; } }
         public IGitLocksCache GitLocksCache { get { return (IGitLocksCache)caches[CacheType.GitLocks].Value; } }

src/GitHub.Api/Cache/CacheInterfaces.cs

@@ -9,6 +9,7 @@ public enum CacheType
         RepositoryInfo,
         Branches,
         GitLog,
+        GitFileLog,
         GitAheadBehind,
         GitStatus,
         GitLocks,
@@ -22,6 +23,7 @@ public interface ICacheContainer : IDisposable
 
         IBranchCache BranchCache { get; }
         IGitLogCache GitLogCache { get; }
+        IGitFileLogCache GitFileLogCache { get; }
         IGitAheadBehindCache GitTrackingStatusCache { get; }
         IGitStatusCache GitStatusEntriesCache { get; }
         IGitLocksCache GitLocksCache { get; }
@@ -115,6 +117,11 @@ public interface IGitLogCache : IManagedCache
         List<GitLogEntry> Log { get; set; }
     }
 
+    public interface IGitFileLogCache : IManagedCache
+    {
+        GitFileLog FileLog { get; set; }
+    }
+
     public interface ICanUpdate<T>
     {
         void UpdateData(T data);

src/GitHub.Api/Git/GitClient.cs

@@ -208,6 +208,15 @@ public interface IGitClient
         /// <returns>String output of git command</returns>
         ITask<string> DiscardAll(IOutputProcessor<string> processor = null);
 
+        /// <summary>
+        /// Executes at least one `git checkout` command to checkout files at the given changeset
+        /// </summary>
+        /// <param name="changeset">The md5 of the changeset</param>
+        /// <param name="files">The files to check out</param>
+        /// <param name="processor">A custom output processor instance</param>
+        /// <returns>String output of git command</returns>
+        ITask<string> CheckoutVersion(string changeset, IList<string> files, IOutputProcessor<string> processor = null);
+
         /// <summary>
         /// Executes at least one `git reset HEAD` command to remove files from the git index.
         /// </summary>
@@ -250,6 +259,14 @@ public interface IGitClient
         /// <returns><see cref="List&lt;T&gt;"/> of <see cref="GitLogEntry"/> output</returns>
         ITask<List<GitLogEntry>> Log(BaseOutputListProcessor<GitLogEntry> processor = null);
 
+        /// <summary>
+        /// Executes `git log -- <file>` to get the history of a specific file.
+        /// </summary>
+        /// <param name="file"></param>
+        /// <param name="processor">A custom output processor instance</param>
+        /// <returns><see cref="List&lt;T&gt;"/> of <see cref="GitLogEntry"/> output</returns>
+        ITask<List<GitLogEntry>> LogFile(string file, BaseOutputListProcessor<GitLogEntry> processor = null);
+
         /// <summary>
         /// Executes `git --version` to get the git version.
         /// </summary>
@@ -341,6 +358,22 @@ public ITask<List<GitLogEntry>> Log(BaseOutputListProcessor<GitLogEntry> process
                 .Then((success, list) => success ? list : new List<GitLogEntry>());
         }
 
+        ///<inheritdoc/>
+        public ITask<List<GitLogEntry>> LogFile(string file, BaseOutputListProcessor<GitLogEntry> processor = null)
+        {
+            if (file == NPath.Default)
+            {
+                return new FuncTask<List<GitLogEntry>>(cancellationToken, () => new List<GitLogEntry>(0));
+            }
+
+            return new GitLogTask(file, new GitObjectFactory(environment), cancellationToken, processor)
+                .Configure(processManager)
+                .Catch(exception => exception is ProcessException &&
+                    exception.Message.StartsWith("fatal: your current branch") &&
+                    exception.Message.EndsWith("does not have any commits yet"))
+                .Then((success, list) => success ? list : new List<GitLogEntry>());
+        }
+
         ///<inheritdoc/>
         public ITask<TheVersion> Version(IOutputProcessor<TheVersion> processor = null)
         {
@@ -565,6 +598,13 @@ public ITask<string> DiscardAll(IOutputProcessor<string> processor = null)
                 .Configure(processManager);
         }
 
+        ///<inheritdoc/>
+        public ITask<string> CheckoutVersion(string changeset, IList<string> files, IOutputProcessor<string> processor = null)
+        {
+            return new GitCheckoutTask(changeset, files, cancellationToken, processor)
+                .Configure(processManager);
+        }
+
         ///<inheritdoc/>
         public ITask<string> Remove(IList<string> files,
             IOutputProcessor<string> processor = null)

src/GitHub.Api/Git/GitFileLog.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+
+namespace GitHub.Unity
+{
+    [Serializable]
+    public struct GitFileLog
+    {
+        public static GitFileLog Default = new GitFileLog(null, new List<GitLogEntry>(0));
+
+        public string path;
+        public List<GitLogEntry> logEntries;
+
+        public GitFileLog(string path, List<GitLogEntry> logEntries)
+        {
+            this.path = path;
+            this.logEntries = logEntries;
+        }
+
+        public string Path
+        {
+            get { return path; }
+            set { path = value; }
+        }
+
+        public List<GitLogEntry> LogEntries
+        {
+            get { return logEntries; }
+            set { logEntries = value; }
+        }
+    }
+}

src/GitHub.Api/Git/IRepository.cs

@@ -21,6 +21,7 @@ public interface IRepository : IEquatable<IRepository>, IDisposable, IBackedByCa
         ITask RequestLock(NPath file);
         ITask ReleaseLock(NPath file, bool force);
         ITask DiscardChanges(GitStatusEntry[] discardEntries);
+        ITask CheckoutVersion(string changeset, IList<string> files);
 
         /// <summary>
         /// Gets the name of the repository.
@@ -61,8 +62,10 @@ public interface IRepository : IEquatable<IRepository>, IDisposable, IBackedByCa
         List<GitLogEntry> CurrentLog { get; }
         bool IsBusy { get; }
         string CurrentHead { get; }
+        GitFileLog CurrentFileLog { get; }
 
         event Action<CacheUpdateEvent> LogChanged;
+        event Action<CacheUpdateEvent> FileLogChanged;
         event Action<CacheUpdateEvent> TrackingStatusChanged;
         event Action<CacheUpdateEvent> StatusEntriesChanged;
         event Action<CacheUpdateEvent> CurrentBranchChanged;
@@ -78,7 +81,8 @@ public interface IRepository : IEquatable<IRepository>, IDisposable, IBackedByCa
         ITask DeleteBranch(string branch, bool force);
         ITask CreateBranch(string branch, string baseBranch);
         ITask SwitchBranch(string branch);
+        ITask UpdateFileLog(string path);
         void Refresh(CacheType cacheType);
         event Action<IProgress> OnProgress;
     }
-}
+}

src/GitHub.Api/Git/Repository.cs

@@ -25,8 +25,10 @@ sealed class Repository : IEquatable<Repository>, IRepository
         private HashSet<CacheType> cacheInvalidationRequests = new HashSet<CacheType>();
         private Dictionary<CacheType, Action<CacheUpdateEvent>> cacheUpdateEvents;
         private ProgressReporter progressReporter = new ProgressReporter();
+        private string lastFileLog;
 
         public event Action<CacheUpdateEvent> LogChanged;
+        public event Action<CacheUpdateEvent> FileLogChanged;
         public event Action<CacheUpdateEvent> TrackingStatusChanged;
         public event Action<CacheUpdateEvent> StatusEntriesChanged;
         public event Action<CacheUpdateEvent> CurrentBranchChanged;
@@ -63,6 +65,7 @@ public Repository(NPath localPath, ICacheContainer container)
                 { CacheType.GitAheadBehind, c => TrackingStatusChanged?.Invoke(c) },
                 { CacheType.GitLocks, c => LocksChanged?.Invoke(c) },
                 { CacheType.GitLog, c => LogChanged?.Invoke(c) },
+                { CacheType.GitFileLog, c => FileLogChanged?.Invoke(c) },
                 { CacheType.GitStatus, c => StatusEntriesChanged?.Invoke(c) },
                 { CacheType.GitUser, cacheUpdateEvent => { } },
                 { CacheType.RepositoryInfo, cacheUpdateEvent => {
@@ -91,6 +94,7 @@ public void Initialize(IRepositoryManager theRepositoryManager, ITaskManager the
             this.repositoryManager.GitStatusUpdated += RepositoryManagerOnGitStatusUpdated;
             this.repositoryManager.GitAheadBehindStatusUpdated += RepositoryManagerOnGitAheadBehindStatusUpdated;
             this.repositoryManager.GitLogUpdated += RepositoryManagerOnGitLogUpdated;
+            this.repositoryManager.GitFileLogUpdated += RepositoryManagerOnGitFileLogUpdated;
             this.repositoryManager.GitLocksUpdated += RepositoryManagerOnGitLocksUpdated;
             this.repositoryManager.LocalBranchesUpdated += RepositoryManagerOnLocalBranchesUpdated;
             this.repositoryManager.RemoteBranchesUpdated += RepositoryManagerOnRemoteBranchesUpdated;
@@ -138,11 +142,17 @@ public ITask SetupRemote(string remote, string remoteUrl)
         public ITask RequestLock(NPath file) => repositoryManager.LockFile(file);
         public ITask ReleaseLock(NPath file, bool force) => repositoryManager.UnlockFile(file, force);
         public ITask DiscardChanges(GitStatusEntry[] gitStatusEntry) => repositoryManager.DiscardChanges(gitStatusEntry);
+        public ITask CheckoutVersion(string changeset, IList<string> files) => repositoryManager.CheckoutVersion(changeset, files);
         public ITask RemoteAdd(string remote, string url) => repositoryManager.RemoteAdd(remote, url);
         public ITask RemoteRemove(string remote) => repositoryManager.RemoteRemove(remote);
         public ITask DeleteBranch(string branch, bool force) => repositoryManager.DeleteBranch(branch, force);
         public ITask CreateBranch(string branch, string baseBranch) => repositoryManager.CreateBranch(branch, baseBranch);
         public ITask SwitchBranch(string branch) => repositoryManager.SwitchBranch(branch);
+        public ITask UpdateFileLog(string path)
+        {
+            lastFileLog = path;
+            return repositoryManager.UpdateFileLog(path);
+        }
 
         public void CheckAndRaiseEventsIfCacheNewer(CacheType cacheType, CacheUpdateEvent cacheUpdateEvent) => cacheContainer.CheckAndRaiseEventsIfCacheNewer(cacheType, cacheUpdateEvent);
 
@@ -215,6 +225,10 @@ private void CacheHasBeenInvalidated(CacheType cacheType)
                     repositoryManager?.UpdateGitLog().Catch(ex => InvalidationFailed(ex, cacheType)).Start();
                     break;
 
+                case CacheType.GitFileLog:
+                    repositoryManager?.UpdateFileLog(lastFileLog).Catch(ex => InvalidationFailed(ex, cacheType)).Start();
+                    break;
+
                 case CacheType.GitAheadBehind:
                     repositoryManager?.UpdateGitAheadBehindStatus().Catch(ex => InvalidationFailed(ex, cacheType)).Start();
                     break;
@@ -295,6 +309,11 @@ private void RepositoryManagerOnGitLogUpdated(List<GitLogEntry> gitLogEntries)
             taskManager.RunInUI(() => cacheContainer.GitLogCache.Log = gitLogEntries);
         }
 
+        private void RepositoryManagerOnGitFileLogUpdated(GitFileLog gitFileLog)
+        {
+            taskManager.RunInUI(() => cacheContainer.GitFileLogCache.FileLog = gitFileLog);
+        }
+
         private void RepositoryManagerOnGitLocksUpdated(List<GitLock> gitLocks)
         {
             taskManager.RunInUI(() => cacheContainer.GitLocksCache.GitLocks = gitLocks);
@@ -360,6 +379,7 @@ public void Dispose()
         public string CurrentBranchName => CurrentConfigBranch?.Name;
         public GitRemote? CurrentRemote => cacheContainer.RepositoryInfoCache.CurrentGitRemote;
         public List<GitLogEntry> CurrentLog => cacheContainer.GitLogCache.Log;
+        public GitFileLog CurrentFileLog => cacheContainer.GitFileLogCache.FileLog;
         public List<GitLock> CurrentLocks => cacheContainer.GitLocksCache.GitLocks;
         public string CurrentHead => cacheContainer.RepositoryInfoCache.CurrentHead;
 

src/GitHub.Api/Git/RepositoryManager.cs

@@ -13,6 +13,7 @@ public interface IRepositoryManager : IDisposable
         event Action<GitStatus> GitStatusUpdated;
         event Action<List<GitLock>> GitLocksUpdated;
         event Action<List<GitLogEntry>> GitLogUpdated;
+        event Action<GitFileLog> GitFileLogUpdated;
         event Action<Dictionary<string, ConfigBranch>> LocalBranchesUpdated;
         event Action<Dictionary<string, ConfigRemote>, Dictionary<string, Dictionary<string, ConfigBranch>>> RemoteBranchesUpdated;
         event Action<GitAheadBehindStatus> GitAheadBehindStatusUpdated;
@@ -37,12 +38,15 @@ public interface IRepositoryManager : IDisposable
         ITask LockFile(NPath file);
         ITask UnlockFile(NPath file, bool force);
         ITask DiscardChanges(GitStatusEntry[] gitStatusEntries);
+        ITask CheckoutVersion(string changeset, IList<string> files);
         ITask UpdateGitLog();
         ITask UpdateGitStatus();
         ITask UpdateGitAheadBehindStatus();
         ITask UpdateLocks();
         ITask UpdateRepositoryInfo();
         ITask UpdateBranches();
+        ITask UpdateFileLog(string path);
+
 
         int WaitForEvents();
 
@@ -136,6 +140,7 @@ class RepositoryManager : IRepositoryManager
         public event Action<GitAheadBehindStatus> GitAheadBehindStatusUpdated;
         public event Action<List<GitLock>> GitLocksUpdated;
         public event Action<List<GitLogEntry>> GitLogUpdated;
+        public event Action<GitFileLog> GitFileLogUpdated;
         public event Action<Dictionary<string, ConfigBranch>> LocalBranchesUpdated;
         public event Action<Dictionary<string, ConfigRemote>, Dictionary<string, Dictionary<string, ConfigBranch>>> RemoteBranchesUpdated;
 
@@ -341,6 +346,13 @@ public ITask DiscardChanges(GitStatusEntry[] gitStatusEntries)
             return HookupHandlers(task, true);
         }
 
+        public ITask CheckoutVersion(string changeset, IList<string> files)
+        {
+            var task = GitClient.CheckoutVersion(changeset, files)
+                                .Then(() => DataNeedsRefreshing?.Invoke(CacheType.GitStatus));
+            return HookupHandlers(task, false);
+        }
+
         public ITask UpdateGitLog()
         {
             var task = GitClient.Log()
@@ -354,6 +366,20 @@ public ITask UpdateGitLog()
             return HookupHandlers(task, false);
         }
 
+        public ITask UpdateFileLog(string path)
+        {
+            var task = GitClient.LogFile(path)
+                                .Then((success, logEntries) =>
+                                {
+                                    if (success)
+                                    {
+                                        var gitFileLog = new GitFileLog(path, logEntries);
+                                        GitFileLogUpdated?.Invoke(gitFileLog);
+                                    }
+                                });
+            return HookupHandlers(task, false);
+        }
+
         public ITask UpdateGitStatus()
         {
             var task = GitClient.Status()
@@ -644,6 +670,7 @@ private void Dispose(bool disposing)
                 GitStatusUpdated = null;
                 GitAheadBehindStatusUpdated = null;
                 GitLogUpdated = null;
+                GitFileLogUpdated = null;
                 GitLocksUpdated = null;
                 LocalBranchesUpdated = null;
                 RemoteBranchesUpdated = null;

src/GitHub.Api/Git/Tasks/GitCheckoutTask.cs

@@ -30,8 +30,29 @@ public GitCheckoutTask(CancellationToken token,
             arguments = "checkout -- .";
         }
 
+        public GitCheckoutTask(
+            string changeset,
+            IEnumerable<string> files,
+            CancellationToken token,
+            IOutputProcessor<string> processor = null) : base(token, processor ?? new SimpleOutputProcessor())
+        {
+            Guard.ArgumentNotNull(files, "files");
+            Name = TaskName;
+
+            arguments = "checkout ";
+            arguments += changeset;
+            arguments += " -- ";
+
+            foreach (var file in files)
+            {
+                arguments += " \"" + file.ToNPath().ToString(SlashMode.Forward) + "\"";
+            }
+
+            Message = "Checking out files at rev " + changeset.Substring(0, 7); 
+        }
+
         public override string ProcessArguments { get { return arguments; } }
         public override TaskAffinity Affinity { get { return TaskAffinity.Exclusive; } }
-        public override string Message { get; set; } = "Checking out branch...";
+        public override string Message { get; set; } = "Checking out files...";
     }
-}
+}