/*
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* Copyright 2011 gitblit.com.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.gitblit.utils;
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import java.io.ByteArrayOutputStream;
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import java.io.Serializable;
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import java.text.MessageFormat;
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import java.util.ArrayList;
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import java.util.List;
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import org.eclipse.jgit.api.BlameCommand;
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import org.eclipse.jgit.blame.BlameResult;
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import org.eclipse.jgit.diff.DiffEntry;
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import org.eclipse.jgit.diff.DiffFormatter;
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import org.eclipse.jgit.diff.RawText;
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import org.eclipse.jgit.diff.RawTextComparator;
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import org.eclipse.jgit.lib.ObjectId;
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import org.eclipse.jgit.lib.Repository;
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import org.eclipse.jgit.revwalk.RevCommit;
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import org.eclipse.jgit.revwalk.RevTree;
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import org.eclipse.jgit.revwalk.RevWalk;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.gitblit.models.AnnotatedLine;
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import com.gitblit.models.PathModel.PathChangeModel;
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/**
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* DiffUtils is a class of utility methods related to diff, patch, and blame.
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*
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* The diff methods support pluggable diff output types like Gitblit, Gitweb,
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* and Plain.
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*
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* @author James Moger
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*
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*/
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public class DiffUtils {
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private static final Logger LOGGER = LoggerFactory.getLogger(DiffUtils.class);
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/**
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* Enumeration for the diff output types.
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*/
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public static enum DiffOutputType {
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PLAIN, HTML;
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public static DiffOutputType forName(String name) {
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for (DiffOutputType type : values()) {
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if (type.name().equalsIgnoreCase(name)) {
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return type;
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}
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}
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return null;
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}
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}
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/**
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* Encapsulates the output of a diff.
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*/
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public static class DiffOutput implements Serializable {
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private static final long serialVersionUID = 1L;
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public final DiffOutputType type;
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public final String content;
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public final DiffStat stat;
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DiffOutput(DiffOutputType type, String content, DiffStat stat) {
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this.type = type;
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this.content = content;
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this.stat = stat;
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}
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public PathChangeModel getPath(String path) {
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if (stat == null) {
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return null;
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}
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return stat.getPath(path);
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}
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}
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/**
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* Class that represents the number of insertions and deletions from a
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* chunk.
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*/
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public static class DiffStat implements Serializable {
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private static final long serialVersionUID = 1L;
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public final List<PathChangeModel> paths = new ArrayList<PathChangeModel>();
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private final String commitId;
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public DiffStat(String commitId) {
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this.commitId = commitId;
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}
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public PathChangeModel addPath(DiffEntry entry) {
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PathChangeModel pcm = PathChangeModel.from(entry, commitId);
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paths.add(pcm);
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return pcm;
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}
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public int getInsertions() {
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int val = 0;
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for (PathChangeModel entry : paths) {
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val += entry.insertions;
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}
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return val;
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}
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public int getDeletions() {
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int val = 0;
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for (PathChangeModel entry : paths) {
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val += entry.deletions;
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}
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return val;
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}
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public PathChangeModel getPath(String path) {
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PathChangeModel stat = null;
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for (PathChangeModel p : paths) {
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if (p.path.equals(path)) {
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stat = p;
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break;
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}
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}
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return stat;
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}
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@Override
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public String toString() {
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StringBuilder sb = new StringBuilder();
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for (PathChangeModel entry : paths) {
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sb.append(entry.toString()).append('\n');
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}
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sb.setLength(sb.length() - 1);
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return sb.toString();
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}
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}
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public static class NormalizedDiffStat implements Serializable {
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private static final long serialVersionUID = 1L;
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public final int insertions;
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public final int deletions;
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public final int blanks;
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NormalizedDiffStat(int insertions, int deletions, int blanks) {
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this.insertions = insertions;
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this.deletions = deletions;
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this.blanks = blanks;
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}
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}
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/**
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* Returns the complete diff of the specified commit compared to its primary
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* parent.
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*
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* @param repository
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* @param commit
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* @param outputType
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* @return the diff
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*/
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public static DiffOutput getCommitDiff(Repository repository, RevCommit commit,
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DiffOutputType outputType) {
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return getDiff(repository, null, commit, null, outputType);
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}
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/**
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* Returns the diff for the specified file or folder from the specified
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* commit compared to its primary parent.
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*
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* @param repository
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* @param commit
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* @param path
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* @param outputType
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* @return the diff
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*/
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public static DiffOutput getDiff(Repository repository, RevCommit commit, String path,
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DiffOutputType outputType) {
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return getDiff(repository, null, commit, path, outputType);
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}
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/**
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* Returns the complete diff between the two specified commits.
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*
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* @param repository
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* @param baseCommit
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* @param commit
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* @param outputType
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* @return the diff
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*/
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public static DiffOutput getDiff(Repository repository, RevCommit baseCommit, RevCommit commit,
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DiffOutputType outputType) {
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return getDiff(repository, baseCommit, commit, null, outputType);
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}
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/**
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* Returns the diff between two commits for the specified file.
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*
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* @param repository
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* @param baseCommit
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* if base commit is null the diff is to the primary parent of
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* the commit.
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* @param commit
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* @param path
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* if the path is specified, the diff is restricted to that file
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* or folder. if unspecified, the diff is for the entire commit.
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* @param outputType
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* @return the diff
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*/
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public static DiffOutput getDiff(Repository repository, RevCommit baseCommit, RevCommit commit,
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String path, DiffOutputType outputType) {
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DiffStat stat = null;
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String diff = null;
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try {
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ByteArrayOutputStream os = null;
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RawTextComparator cmp = RawTextComparator.DEFAULT;
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DiffFormatter df;
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switch (outputType) {
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case HTML:
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df = new GitBlitDiffFormatter(commit.getName(), path);
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break;
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case PLAIN:
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default:
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os = new ByteArrayOutputStream();
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df = new DiffFormatter(os);
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break;
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}
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df.setRepository(repository);
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df.setDiffComparator(cmp);
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df.setDetectRenames(true);
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RevTree commitTree = commit.getTree();
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RevTree baseTree;
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if (baseCommit == null) {
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if (commit.getParentCount() > 0) {
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final RevWalk rw = new RevWalk(repository);
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RevCommit parent = rw.parseCommit(commit.getParent(0).getId());
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rw.dispose();
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baseTree = parent.getTree();
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} else {
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// FIXME initial commit. no parent?!
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baseTree = commitTree;
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}
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} else {
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baseTree = baseCommit.getTree();
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}
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List<DiffEntry> diffEntries = df.scan(baseTree, commitTree);
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if (path != null && path.length() > 0) {
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for (DiffEntry diffEntry : diffEntries) {
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if (diffEntry.getNewPath().equalsIgnoreCase(path)) {
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df.format(diffEntry);
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break;
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}
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}
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} else {
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df.format(diffEntries);
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}
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df.flush();
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if (df instanceof GitBlitDiffFormatter) {
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// workaround for complex private methods in DiffFormatter
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diff = ((GitBlitDiffFormatter) df).getHtml();
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stat = ((GitBlitDiffFormatter) df).getDiffStat();
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} else {
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diff = os.toString();
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}
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} catch (Throwable t) {
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LOGGER.error("failed to generate commit diff!", t);
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}
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return new DiffOutput(outputType, diff, stat);
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}
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/**
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* Returns the diff between the two commits for the specified file or folder
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* formatted as a patch.
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*
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* @param repository
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* @param baseCommit
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* if base commit is unspecified, the patch is generated against
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* the primary parent of the specified commit.
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* @param commit
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* @param path
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* if path is specified, the patch is generated only for the
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* specified file or folder. if unspecified, the patch is
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* generated for the entire diff between the two commits.
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* @return patch as a string
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*/
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public static String getCommitPatch(Repository repository, RevCommit baseCommit,
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RevCommit commit, String path) {
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String diff = null;
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try {
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final ByteArrayOutputStream os = new ByteArrayOutputStream();
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RawTextComparator cmp = RawTextComparator.DEFAULT;
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PatchFormatter df = new PatchFormatter(os);
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df.setRepository(repository);
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df.setDiffComparator(cmp);
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df.setDetectRenames(true);
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RevTree commitTree = commit.getTree();
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RevTree baseTree;
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if (baseCommit == null) {
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if (commit.getParentCount() > 0) {
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final RevWalk rw = new RevWalk(repository);
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RevCommit parent = rw.parseCommit(commit.getParent(0).getId());
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baseTree = parent.getTree();
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} else {
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// FIXME initial commit. no parent?!
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baseTree = commitTree;
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}
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} else {
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baseTree = baseCommit.getTree();
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}
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List<DiffEntry> diffEntries = df.scan(baseTree, commitTree);
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if (path != null && path.length() > 0) {
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for (DiffEntry diffEntry : diffEntries) {
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if (diffEntry.getNewPath().equalsIgnoreCase(path)) {
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df.format(diffEntry);
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break;
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}
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}
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} else {
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df.format(diffEntries);
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}
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diff = df.getPatch(commit);
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df.flush();
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} catch (Throwable t) {
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LOGGER.error("failed to generate commit diff!", t);
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}
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return diff;
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}
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/**
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* Returns the diffstat between the two commits for the specified file or folder.
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*
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* @param repository
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* @param base
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* if base commit is unspecified, the diffstat is generated against
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* the primary parent of the specified tip.
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* @param tip
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* @param path
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* if path is specified, the diffstat is generated only for the
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* specified file or folder. if unspecified, the diffstat is
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* generated for the entire diff between the two commits.
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* @return patch as a string
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*/
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public static DiffStat getDiffStat(Repository repository, String base, String tip) {
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RevCommit baseCommit = null;
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RevCommit tipCommit = null;
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RevWalk revWalk = new RevWalk(repository);
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try {
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tipCommit = revWalk.parseCommit(repository.resolve(tip));
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if (!StringUtils.isEmpty(base)) {
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baseCommit = revWalk.parseCommit(repository.resolve(base));
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}
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return getDiffStat(repository, baseCommit, tipCommit, null);
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} catch (Exception e) {
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LOGGER.error("failed to generate diffstat!", e);
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} finally {
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revWalk.dispose();
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}
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return null;
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}
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public static DiffStat getDiffStat(Repository repository, RevCommit commit) {
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return getDiffStat(repository, null, commit, null);
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}
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/**
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* Returns the diffstat between the two commits for the specified file or folder.
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*
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* @param repository
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* @param baseCommit
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* if base commit is unspecified, the diffstat is generated against
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* the primary parent of the specified commit.
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* @param commit
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* @param path
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* if path is specified, the diffstat is generated only for the
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* specified file or folder. if unspecified, the diffstat is
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* generated for the entire diff between the two commits.
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* @return patch as a string
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*/
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public static DiffStat getDiffStat(Repository repository, RevCommit baseCommit,
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RevCommit commit, String path) {
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DiffStat stat = null;
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try {
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RawTextComparator cmp = RawTextComparator.DEFAULT;
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DiffStatFormatter df = new DiffStatFormatter(commit.getName());
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df.setRepository(repository);
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df.setDiffComparator(cmp);
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df.setDetectRenames(true);
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RevTree commitTree = commit.getTree();
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RevTree baseTree;
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if (baseCommit == null) {
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if (commit.getParentCount() > 0) {
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final RevWalk rw = new RevWalk(repository);
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RevCommit parent = rw.parseCommit(commit.getParent(0).getId());
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baseTree = parent.getTree();
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} else {
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// FIXME initial commit. no parent?!
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baseTree = commitTree;
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}
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} else {
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baseTree = baseCommit.getTree();
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}
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List<DiffEntry> diffEntries = df.scan(baseTree, commitTree);
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if (path != null && path.length() > 0) {
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for (DiffEntry diffEntry : diffEntries) {
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if (diffEntry.getNewPath().equalsIgnoreCase(path)) {
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df.format(diffEntry);
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break;
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}
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}
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} else {
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df.format(diffEntries);
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}
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stat = df.getDiffStat();
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df.flush();
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} catch (Throwable t) {
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LOGGER.error("failed to generate commit diff!", t);
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}
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return stat;
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}
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/**
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* Returns the list of lines in the specified source file annotated with the
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* source commit metadata.
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*
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* @param repository
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* @param blobPath
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* @param objectId
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* @return list of annotated lines
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*/
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public static List<AnnotatedLine> blame(Repository repository, String blobPath, String objectId) {
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List<AnnotatedLine> lines = new ArrayList<AnnotatedLine>();
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try {
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ObjectId object;
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if (StringUtils.isEmpty(objectId)) {
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object = JGitUtils.getDefaultBranch(repository);
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} else {
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object = repository.resolve(objectId);
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}
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BlameCommand blameCommand = new BlameCommand(repository);
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blameCommand.setFilePath(blobPath);
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blameCommand.setStartCommit(object);
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BlameResult blameResult = blameCommand.call();
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RawText rawText = blameResult.getResultContents();
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int length = rawText.size();
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for (int i = 0; i < length; i++) {
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RevCommit commit = blameResult.getSourceCommit(i);
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AnnotatedLine line = new AnnotatedLine(commit, i + 1, rawText.getString(i));
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lines.add(line);
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}
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} catch (Throwable t) {
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LOGGER.error(MessageFormat.format("failed to generate blame for {0} {1}!", blobPath, objectId), t);
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}
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return lines;
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}
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/**
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* Normalizes a diffstat to an N-segment display.
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*
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* @params segments
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* @param insertions
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* @param deletions
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* @return a normalized diffstat
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*/
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public static NormalizedDiffStat normalizeDiffStat(final int segments, final int insertions, final int deletions) {
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final int total = insertions + deletions;
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final float fi = ((float) insertions) / total;
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int si;
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int sd;
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int sb;
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if (deletions == 0) {
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// only addition
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si = Math.min(insertions, segments);
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sd = 0;
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sb = si < segments ? (segments - si) : 0;
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} else if (insertions == 0) {
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// only deletion
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si = 0;
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sd = Math.min(deletions, segments);
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sb = sd < segments ? (segments - sd) : 0;
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} else if (total <= segments) {
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// total churn fits in segment display
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si = insertions;
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sd = deletions;
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sb = segments - total;
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} else if ((segments % 2) > 0 && fi > 0.45f && fi < 0.55f) {
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// odd segment display, fairly even +/-, use even number of segments
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si = Math.round(((float) insertions)/total * (segments - 1));
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sd = segments - 1 - si;
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sb = 1;
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} else {
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si = Math.round(((float) insertions)/total * segments);
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sd = segments - si;
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sb = 0;
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}
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return new NormalizedDiffStat(si, sd, sb);
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}
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}
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