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/*
* Copyright 2011 gitblit.com.
*
* 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 com.gitblit.utils;
import java.io.IOException;
import java.io.OutputStream;
import java.text.MessageFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.jgit.diff.DiffEntry;
import org.eclipse.jgit.diff.DiffFormatter;
import org.eclipse.jgit.diff.RawText;
import org.eclipse.jgit.revwalk.RevCommit;
import com.gitblit.Constants;
/**
* A diff formatter that outputs standard patch content.
*
* @author James Moger
*
*/
public class PatchFormatter extends DiffFormatter {
private final OutputStream os;
private Map<String, PatchTouple> changes = new HashMap<String, PatchTouple>();
private PatchTouple currentTouple;
public PatchFormatter(OutputStream os) {
super(os);
this.os = os;
}
public void format(DiffEntry entry) throws IOException {
currentTouple = new PatchTouple();
changes.put(entry.getNewPath(), currentTouple);
super.format(entry);
}
@Override
protected void writeLine(final char prefix, final RawText text, final int cur)
throws IOException {
switch (prefix) {
case '+':
currentTouple.insertions++;
break;
case '-':
currentTouple.deletions++;
break;
}
super.writeLine(prefix, text, cur);
}
public String getPatch(RevCommit commit) {
StringBuilder patch = new StringBuilder();
// hard-code the mon sep 17 2001 date string.
// I have no idea why that is there. it seems to be a constant.
patch.append("From " + commit.getName() + " Mon Sep 17 00:00:00 2001" + "\n");
patch.append("From: " + JGitUtils.getDisplayName(commit.getAuthorIdent()) + "\n");
patch.append("Date: "
+ (new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z").format(new Date(commit
.getCommitTime() * 1000L))) + "\n");
patch.append("Subject: [PATCH] " + commit.getShortMessage() + "\n");
patch.append('\n');
patch.append("---");
int maxPathLen = 0;
int files = 0;
int insertions = 0;
int deletions = 0;
for (String path : changes.keySet()) {
if (path.length() > maxPathLen) {
maxPathLen = path.length();
}
PatchTouple touple = changes.get(path);
files++;
insertions += touple.insertions;
deletions += touple.deletions;
}
int columns = 60;
int total = insertions + deletions;
int unit = total / columns + (total % columns > 0 ? 1 : 0);
if (unit == 0) {
unit = 1;
}
for (String path : changes.keySet()) {
PatchTouple touple = changes.get(path);
patch.append("\n " + StringUtils.rightPad(path, maxPathLen, ' ') + " | "
+ StringUtils.leftPad("" + touple.total(), 4, ' ') + " "
+ touple.relativeScale(unit));
}
patch.append(MessageFormat.format(
"\n {0} files changed, {1} insertions(+), {2} deletions(-)\n\n", files, insertions,
deletions));
patch.append(os.toString());
patch.append("\n--\n");
patch.append(Constants.getGitBlitVersion());
return patch.toString();
}
/**
* Class that represents the number of insertions and deletions from a
* chunk.
*/
private static class PatchTouple {
int insertions;
int deletions;
int total() {
return insertions + deletions;
}
String relativeScale(int unit) {
int plus = insertions / unit;
int minus = deletions / unit;
StringBuilder sb = new StringBuilder();
for (int i = 0; i < plus; i++) {
sb.append('+');
}
for (int i = 0; i < minus; i++) {
sb.append('-');
}
return sb.toString();
}
}
}
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