[log] Add GitBekParentFixer for GitLogProvider.

plugins/git4idea/src/git4idea/log/GitBekParentFixer.java

@@ -0,0 +1,156 @@
+/*
+ * Copyright 2000-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package git4idea.log;
+
+import com.intellij.openapi.vcs.VcsException;
+import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.util.Function;
+import com.intellij.util.containers.ContainerUtil;
+import com.intellij.vcs.log.*;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.*;
+
+class GitBekParentFixer {
+  @NotNull
+  private final static String MAGIC_TEXT = "Merge remote";
+  @NotNull
+  private final VcsLogFilterCollection MAGIC_FILTER = createVcsLogFilterCollection();
+
+  @NotNull
+  private final VirtualFile myRoot;
+  @NotNull
+  private final GitLogProvider myGitLogProvider;
+  @NotNull
+  private final List<TimedVcsCommit> myAllCommits;
+
+  GitBekParentFixer(@NotNull VirtualFile root, @NotNull GitLogProvider gitLogProvider, @NotNull List<TimedVcsCommit> allCommits) {
+    myRoot = root;
+    myGitLogProvider = gitLogProvider;
+    myAllCommits = allCommits;
+  }
+
+  @NotNull
+  List<TimedVcsCommit> getCorrectCommits() throws VcsException {
+    final Set<Hash> wrongCommits = getWrongCommits();
+    return new AbstractList<TimedVcsCommit>() {
+      @Override
+      public TimedVcsCommit get(int index) {
+        TimedVcsCommit commit = myAllCommits.get(index);
+        if (!wrongCommits.contains(commit.getId()))
+          return commit;
+
+        return reverseParents(commit);
+      }
+
+      @Override
+      public int size() {
+        return myAllCommits.size();
+      }
+    };
+  }
+
+  private Set<Hash> getWrongCommits() throws VcsException {
+    List<TimedVcsCommit> commitsMatchingFilter = myGitLogProvider.getCommitsMatchingFilter(myRoot, MAGIC_FILTER, -1);
+    return ContainerUtil.map2Set(commitsMatchingFilter, new Function<TimedVcsCommit, Hash>() {
+      @Override
+      public Hash fun(TimedVcsCommit timedVcsCommit) {
+        return timedVcsCommit.getId();
+      }
+    });
+  }
+
+  @NotNull
+  private static TimedVcsCommit reverseParents(@NotNull final TimedVcsCommit commit) {
+    return new TimedVcsCommit() {
+      @Override
+      public long getTimestamp() {
+        return commit.getTimestamp();
+      }
+
+      @NotNull
+      @Override
+      public Hash getId() {
+        return commit.getId();
+      }
+
+      @NotNull
+      @Override
+      public List<Hash> getParents() {
+        return ContainerUtil.reverse(commit.getParents());
+      }
+    };
+  }
+
+  private static VcsLogFilterCollection createVcsLogFilterCollection() {
+    final VcsLogTextFilter textFilter = new VcsLogTextFilter() {
+      @NotNull
+      @Override
+      public String getText() {
+        return MAGIC_TEXT;
+      }
+
+      @Override
+      public boolean matches(@NotNull VcsCommitMetadata details) {
+        return details.getFullMessage().contains(MAGIC_TEXT);
+      }
+    };
+
+    return new VcsLogFilterCollection() {
+      @Nullable
+      @Override
+      public VcsLogBranchFilter getBranchFilter() {
+        return null;
+      }
+
+      @Nullable
+      @Override
+      public VcsLogUserFilter getUserFilter() {
+        return null;
+      }
+
+      @Nullable
+      @Override
+      public VcsLogDateFilter getDateFilter() {
+        return null;
+      }
+
+      @Nullable
+      @Override
+      public VcsLogTextFilter getTextFilter() {
+        return textFilter;
+      }
+
+      @Nullable
+      @Override
+      public VcsLogStructureFilter getStructureFilter() {
+        return null;
+      }
+
+      @Override
+      public boolean isEmpty() {
+        return false;
+      }
+
+      @NotNull
+      @Override
+      public List<VcsLogDetailsFilter> getDetailsFilters() {
+        return Collections.<VcsLogDetailsFilter>singletonList(textFilter);
+      }
+    };
+  }
+}

plugins/git4idea/src/git4idea/log/GitLogProvider.java

@@ -163,7 +163,9 @@ public class GitLogProvider implements VcsLogProvider {
 
     List<String> parameters = new ArrayList<String>(GitHistoryUtils.LOG_ALL);
     parameters.add("--sparse");
-    return GitHistoryUtils.readCommits(myProject, root, userRegistry, parameters);
+
+    List<TimedVcsCommit> timedVcsCommits = GitHistoryUtils.readCommits(myProject, root, userRegistry, parameters);
+    return new GitBekParentFixer(root, this, timedVcsCommits).getCorrectCommits();
   }
 
   @NotNull