Support getting nullable configuration values

Author: dahlbyk

LibGit2Sharp.Tests/ConfigurationFixture.cs

@@ -124,6 +124,7 @@ public void CanReadBooleanValue()
             using (var repo = new Repository(StandardTestRepoPath))
             {
                 Assert.True(repo.Config.Get<bool>("core.ignorecase"));
+                Assert.Equal(true, repo.Config.Get<bool?>("core.ignorecase"));
             }
         }
 
@@ -133,6 +134,7 @@ public void CanReadIntValue()
             using (var repo = new Repository(StandardTestRepoPath))
             {
                 Assert.Equal(2, repo.Config.Get<int>("unittests.intsetting"));
+                Assert.Equal(2, repo.Config.Get<int?>("unittests.intsetting"));
             }
         }
 
@@ -142,6 +144,7 @@ public void CanReadLongValue()
             using (var repo = new Repository(StandardTestRepoPath))
             {
                 Assert.Equal(15234, repo.Config.Get<long>("unittests.longsetting"));
+                Assert.Equal(15234, repo.Config.Get<long?>("unittests.longsetting"));
             }
         }
 
@@ -320,12 +323,18 @@ public void ReadingValueThatDoesntExistReturnsDefault()
             {
                 Assert.Null(repo.Config.Get<string>("unittests.ghostsetting"));
                 Assert.Equal(0, repo.Config.Get<int>("unittests.ghostsetting"));
+                Assert.Null(repo.Config.Get<int?>("unittests.ghostsetting"));
                 Assert.Equal(0L, repo.Config.Get<long>("unittests.ghostsetting"));
+                Assert.Null(repo.Config.Get<long?>("unittests.ghostsetting"));
                 Assert.False(repo.Config.Get<bool>("unittests.ghostsetting"));
+                Assert.Null(repo.Config.Get<bool?>("unittests.ghostsetting"));
                 Assert.Equal("42", repo.Config.Get("unittests.ghostsetting", "42"));
                 Assert.Equal(42, repo.Config.Get("unittests.ghostsetting", 42));
+                Assert.Equal(42, repo.Config.Get<int?>("unittests.ghostsetting", 42));
                 Assert.Equal(42L, repo.Config.Get("unittests.ghostsetting", 42L));
+                Assert.Equal(42L, repo.Config.Get<long?>("unittests.ghostsetting", 42L));
                 Assert.True(repo.Config.Get("unittests.ghostsetting", true));
+                Assert.Equal(true, repo.Config.Get<bool?>("unittests.ghostsetting", true));
             }
         }
 

LibGit2Sharp/Configuration.cs

@@ -390,8 +390,11 @@ private static Func<string, object, ConfigurationSafeHandle, object> GetRetrieve
         private readonly IDictionary<Type, Func<string, object, ConfigurationSafeHandle, object>> configurationTypedRetriever = new Dictionary<Type, Func<string, object, ConfigurationSafeHandle, object>>
         {
             { typeof(int), GetRetriever(Proxy.git_config_get_int32) },
+            { typeof(int?), GetRetriever(Proxy.git_config_get_int32) },
             { typeof(long), GetRetriever(Proxy.git_config_get_int64) },
+            { typeof(long?), GetRetriever(Proxy.git_config_get_int64) },
             { typeof(bool), GetRetriever(Proxy.git_config_get_bool) },
+            { typeof(bool?), GetRetriever(Proxy.git_config_get_bool) },
             { typeof(string), GetRetriever(Proxy.git_config_get_string) },
         };