Move FindMergeBase() overloads to ObjectDatabase

Per isssues #864 and #951, the overloads of FindMergeBase() have been moved
from CommitLog to ObjectDatabase.

The methods on ICommitLog and CommitLog have been deprecated, and calls to
the CommitLog methods have been changed to call the ObjectDatabase versions
instead.

The relevant tests have been updated as well.

Fixes #864 #951

Author: bording

LibGit2Sharp.Tests/CommitAncestorFixture.cs

@@ -41,7 +41,7 @@ public void FindCommonAncestorForTwoCommits(string result, string sha1, string s
                 var first = sha1 == "-" ? CreateOrphanedCommit(repo) : repo.Lookup<Commit>(sha1);
                 var second = sha2 == "-" ? CreateOrphanedCommit(repo) : repo.Lookup<Commit>(sha2);
 
-                Commit ancestor = repo.Commits.FindMergeBase(first, second);
+                Commit ancestor = repo.ObjectDatabase.FindMergeBase(first, second);
 
                 if (result == null)
                 {
@@ -71,7 +71,7 @@ public void FindCommonAncestorForCommitsAsEnumerable(string result, string[] sha
             {
                 var commits = shas.Select(sha => sha == "-" ? CreateOrphanedCommit(repo) : repo.Lookup<Commit>(sha)).ToArray();
 
-                Commit ancestor = repo.Commits.FindMergeBase(commits, strategy);
+                Commit ancestor = repo.ObjectDatabase.FindMergeBase(commits, strategy);
 
                 if (result == null)
                 {
@@ -96,7 +96,7 @@ public void FindCommonAncestorForTwoCommitsThrows(string sha1, string sha2)
                 var first = repo.Lookup<Commit>(sha1);
                 var second = repo.Lookup<Commit>(sha2);
 
-                Assert.Throws<ArgumentNullException>(() => repo.Commits.FindMergeBase(first, second));
+                Assert.Throws<ArgumentNullException>(() => repo.ObjectDatabase.FindMergeBase(first, second));
             }
         }
 
@@ -112,7 +112,7 @@ public void FindCommonAncestorForCommitsAsEnumerableThrows(string[] shas, MergeB
             {
                 var commits = shas.Select(sha => sha == "-" ? CreateOrphanedCommit(repo) : repo.Lookup<Commit>(sha)).ToArray();
 
-                Assert.Throws<ArgumentException>(() => repo.Commits.FindMergeBase(commits, strategy));
+                Assert.Throws<ArgumentException>(() => repo.ObjectDatabase.FindMergeBase(commits, strategy));
             }
         }
 

LibGit2Sharp/CommitLog.cs

@@ -87,12 +87,10 @@ public ICommitLog QueryBy(CommitFilter filter)
         /// <param name="first">The first <see cref="Commit"/>.</param>
         /// <param name="second">The second <see cref="Commit"/>.</param>
         /// <returns>The merge base or null if none found.</returns>
+        [Obsolete("This method will be removed in the next release. Please use ObjectDatabase.FindMergeBase() instead.")]
         public Commit FindMergeBase(Commit first, Commit second)
         {
-            Ensure.ArgumentNotNull(first, "first");
-            Ensure.ArgumentNotNull(second, "second");
-
-            return FindMergeBase(new[] { first, second }, MergeBaseFindingStrategy.Standard);
+            return repo.ObjectDatabase.FindMergeBase(first, second);
         }
 
         /// <summary>
@@ -101,42 +99,10 @@ public Commit FindMergeBase(Commit first, Commit second)
         /// <param name="commits">The <see cref="Commit"/>s for which to find the merge base.</param>
         /// <param name="strategy">The strategy to leverage in order to find the merge base.</param>
         /// <returns>The merge base or null if none found.</returns>
+        [Obsolete("This method will be removed in the next release. Please use ObjectDatabase.FindMergeBase() instead.")]
         public Commit FindMergeBase(IEnumerable<Commit> commits, MergeBaseFindingStrategy strategy)
         {
-            Ensure.ArgumentNotNull(commits, "commits");
-
-            ObjectId id;
-            List<GitOid> ids = new List<GitOid>(8);
-            int count = 0;
-
-            foreach (var commit in commits)
-            {
-                if (commit == null)
-                {
-                    throw new ArgumentException("Enumerable contains null at position: " + count.ToString(CultureInfo.InvariantCulture), "commits");
-                }
-                ids.Add(commit.Id.Oid);
-                count++;
-            }
-
-            if (count < 2)
-            {
-                throw new ArgumentException("The enumerable must contains at least two commits.", "commits");
-            }
-
-            switch (strategy)
-            {
-                case MergeBaseFindingStrategy.Standard:
-                    id = Proxy.git_merge_base_many(repo.Handle, ids.ToArray());
-                    break;
-                case MergeBaseFindingStrategy.Octopus:
-                    id = Proxy.git_merge_base_octopus(repo.Handle, ids.ToArray());
-                    break;
-                default:
-                    throw new ArgumentException("", "strategy");
-            }
-
-            return id == null ? null : repo.Lookup<Commit>(id);
+            return repo.ObjectDatabase.FindMergeBase(commits, strategy);
         }
 
         private class CommitEnumerator : IEnumerator<Commit>

LibGit2Sharp/HistoryDivergence.cs

@@ -19,7 +19,7 @@ protected HistoryDivergence()
 
         internal HistoryDivergence(Repository repo, Commit one, Commit another)
         {
-            commonAncestor = new Lazy<Commit>(() => repo.Commits.FindMergeBase(one, another));
+            commonAncestor = new Lazy<Commit>(() => repo.ObjectDatabase.FindMergeBase(one, another));
             Tuple<int?, int?> div = Proxy.git_graph_ahead_behind(repo.Handle, one, another);
 
             One = one;

LibGit2Sharp/IQueryableCommitLog.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 
 namespace LibGit2Sharp
 {
@@ -20,6 +21,7 @@ public interface IQueryableCommitLog : ICommitLog
         /// <param name="first">The first <see cref="Commit"/>.</param>
         /// <param name="second">The second <see cref="Commit"/>.</param>
         /// <returns>The merge base or null if none found.</returns>
+        [Obsolete("This method will be removed in the next release. Please use ObjectDatabase.FindMergeBase() instead.")]
         Commit FindMergeBase(Commit first, Commit second);
 
         /// <summary>
@@ -28,6 +30,7 @@ public interface IQueryableCommitLog : ICommitLog
         /// <param name="commits">The <see cref="Commit"/>s for which to find the merge base.</param>
         /// <param name="strategy">The strategy to leverage in order to find the merge base.</param>
         /// <returns>The merge base or null if none found.</returns>
+        [Obsolete("This method will be removed in the next release. Please use ObjectDatabase.FindMergeBase() instead.")]
         Commit FindMergeBase(IEnumerable<Commit> commits, MergeBaseFindingStrategy strategy);
     }
 }

LibGit2Sharp/ObjectDatabase.cs

@@ -422,7 +422,7 @@ public virtual bool CanMergeWithoutConflict(Commit one, Commit another)
             using (var ourHandle = Proxy.git_object_peel(repo.Handle, one.Id, GitObjectType.Tree, true))
             using (var theirHandle = Proxy.git_object_peel(repo.Handle, another.Id, GitObjectType.Tree, true))
             {
-                var ancestorCommit = repo.Commits.FindMergeBase(one, another);
+                var ancestorCommit = FindMergeBase(one, another);
 
                 var ancestorHandle = ancestorCommit != null
                     ? Proxy.git_object_peel(repo.Handle, ancestorCommit.Id, GitObjectType.Tree, false)
@@ -435,5 +435,63 @@ public virtual bool CanMergeWithoutConflict(Commit one, Commit another)
                 }
             }
         }
+
+        /// <summary>
+        /// Find the best possible merge base given two <see cref="Commit"/>s.
+        /// </summary>
+        /// <param name="first">The first <see cref="Commit"/>.</param>
+        /// <param name="second">The second <see cref="Commit"/>.</param>
+        /// <returns>The merge base or null if none found.</returns>
+        public virtual Commit FindMergeBase(Commit first, Commit second)
+        {
+            Ensure.ArgumentNotNull(first, "first");
+            Ensure.ArgumentNotNull(second, "second");
+
+            return FindMergeBase(new[] { first, second }, MergeBaseFindingStrategy.Standard);
+        }
+
+        /// <summary>
+        /// Find the best possible merge base given two or more <see cref="Commit"/> according to the <see cref="MergeBaseFindingStrategy"/>.
+        /// </summary>
+        /// <param name="commits">The <see cref="Commit"/>s for which to find the merge base.</param>
+        /// <param name="strategy">The strategy to leverage in order to find the merge base.</param>
+        /// <returns>The merge base or null if none found.</returns>
+        public virtual Commit FindMergeBase(IEnumerable<Commit> commits, MergeBaseFindingStrategy strategy)
+        {
+            Ensure.ArgumentNotNull(commits, "commits");
+
+            ObjectId id;
+            List<GitOid> ids = new List<GitOid>(8);
+            int count = 0;
+
+            foreach (var commit in commits)
+            {
+                if (commit == null)
+                {
+                    throw new ArgumentException("Enumerable contains null at position: " + count.ToString(CultureInfo.InvariantCulture), "commits");
+                }
+                ids.Add(commit.Id.Oid);
+                count++;
+            }
+
+            if (count < 2)
+            {
+                throw new ArgumentException("The enumerable must contains at least two commits.", "commits");
+            }
+
+            switch (strategy)
+            {
+                case MergeBaseFindingStrategy.Standard:
+                    id = Proxy.git_merge_base_many(repo.Handle, ids.ToArray());
+                    break;
+                case MergeBaseFindingStrategy.Octopus:
+                    id = Proxy.git_merge_base_octopus(repo.Handle, ids.ToArray());
+                    break;
+                default:
+                    throw new ArgumentException("", "strategy");
+            }
+
+            return id == null ? null : repo.Lookup<Commit>(id);
+        }
     }
 }