plugins/git4idea/src/git4idea/rebase/GitRebaseProblemDetector.java

/*
 * Copyright 2000-2011 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.rebase;

import com.intellij.openapi.util.Key;
import git4idea.commands.GitLineHandlerAdapter;

import java.util.concurrent.atomic.AtomicBoolean;

/**
 * <p>
 * Detector of problems during rebase operations, that may need to perform additional steps to handle.
 * Such problems are: merge conflicts during applying commit;
 * "no changes" error which happens when the change is empty (for instance, a change was introduced in a commit, but then
 * discarded while merging. In that case 'git rebase --skip' is used.
 * </p>
 * <p>
 * To use the detector add it as a {@link git4idea.commands.GitLineHandlerListener} to {@link git4idea.commands.GitLineHandler}
 * </p>
 */
public class GitRebaseProblemDetector extends GitLineHandlerAdapter {
  private final static String[] REBASE_CONFLICT_INDICATORS = {
    "Merge conflict in",
    "hint: after resolving the conflicts, mark the corrected paths",
    "Failed to merge in the changes",
    "could not apply"};
  private static final String REBASE_NO_CHANGE_INDICATOR = "No changes - did you forget to use 'git add'?";

  private AtomicBoolean mergeConflict = new AtomicBoolean(false);
  private AtomicBoolean noChangeError = new AtomicBoolean(false);

  public boolean isNoChangeError() {
    return noChangeError.get();
  }

  public boolean isMergeConflict() {
    return mergeConflict.get();
  }

  @Override
  public void onLineAvailable(String line, Key outputType) {
    for (String conflictIndicator : REBASE_CONFLICT_INDICATORS) {
      if (line.contains(conflictIndicator)) {
        mergeConflict.set(true);
        return;
      }
    }
    if (line.contains(REBASE_NO_CHANGE_INDICATOR)) {
      noChangeError.set(true);
    }
  }
}