org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Blame.java - jgit - Git at Google

 /*
  * Copyright (C) 2011, Google Inc.
  * Copyright (C) 2009, Christian Halstrick <christian.halstrick@sap.com>
  * Copyright (C) 2009, Johannes E. Schindelin
  * Copyright (C) 2009, Johannes Schindelin <johannes.schindelin@gmx.de>
  * and other copyright owners as documented in the project's IP log.
  *
  * This program and the accompanying materials are made available
  * under the terms of the Eclipse Distribution License v1.0 which
  * accompanies this distribution, is reproduced below, and is
  * available at http://www.eclipse.org/org/documents/edl-v10.php
  *
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or
  * without modification, are permitted provided that the following
  * conditions are met:
  *
  * - Redistributions of source code must retain the above copyright
  *   notice, this list of conditions and the following disclaimer.
  *
  * - Redistributions in binary form must reproduce the above
  *   copyright notice, this list of conditions and the following
  *   disclaimer in the documentation and/or other materials provided
  *   with the distribution.
  *
  * - Neither the name of the Eclipse Foundation, Inc. nor the
  *   names of its contributors may be used to endorse or promote
  *   products derived from this software without specific prior
  *   written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 package org.eclipse.jgit.pgm;

 import static java.lang.Integer.valueOf;
 import static java.lang.Long.valueOf;
 import static org.eclipse.jgit.lib.Constants.OBJECT_ID_STRING_LENGTH;

 import java.io.File;
 import java.io.IOException;
 import java.text.MessageFormat;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.regex.Pattern;

 import org.eclipse.jgit.blame.BlameGenerator;
 import org.eclipse.jgit.blame.BlameResult;
 import org.eclipse.jgit.diff.RawText;
 import org.eclipse.jgit.diff.RawTextComparator;
 import org.eclipse.jgit.dircache.DirCache;
 import org.eclipse.jgit.errors.NoWorkTreeException;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.ObjectReader;
 import org.eclipse.jgit.lib.PersonIdent;
 import org.eclipse.jgit.pgm.internal.CLIText;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevFlag;
 import org.kohsuke.args4j.Argument;
 import org.kohsuke.args4j.Option;

 @Command(common = false, usage = "usage_Blame")
 class Blame extends TextBuiltin {
 	private RawTextComparator comparator = RawTextComparator.DEFAULT;

 	@Option(name = "-w", usage = "usage_ignoreWhitespace")
 	void ignoreAllSpace(@SuppressWarnings("unused") boolean on) {
 		comparator = RawTextComparator.WS_IGNORE_ALL;
 	}

 	@Option(name = "--abbrev", metaVar = "metaVar_n", usage = "usage_abbrevCommits")
 	private int abbrev;

 	@Option(name = "-l", usage = "usage_blameLongRevision")
 	private boolean showLongRevision;

 	@Option(name = "-t", usage = "usage_blameRawTimestamp")
 	private boolean showRawTimestamp;

 	@Option(name = "-b", usage = "usage_blameShowBlankBoundary")
 	private boolean showBlankBoundary;

 	@Option(name = "-s", usage = "usage_blameSuppressAuthor")
 	private boolean noAuthor;

 	@Option(name = "--show-email", aliases = { "-e" }, usage = "usage_blameShowEmail")
 	private boolean showAuthorEmail;

 	@Option(name = "--show-name", aliases = { "-f" }, usage = "usage_blameShowSourcePath")
 	private boolean showSourcePath;

 	@Option(name = "--show-number", aliases = { "-n" }, usage = "usage_blameShowSourceLine")
 	private boolean showSourceLine;

 	@Option(name = "--root", usage = "usage_blameShowRoot")
 	private boolean root;

 	@Option(name = "-L", metaVar = "metaVar_blameL", usage = "usage_blameRange")
 	private String rangeString;

 	@Option(name = "--reverse", metaVar = "metaVar_blameReverse", usage = "usage_blameReverse")
 	private List<RevCommit> reverseRange = new ArrayList<>(2);

 	@Argument(index = 0, required = false, metaVar = "metaVar_revision")
 	private String revision;

 	@Argument(index = 1, required = false, metaVar = "metaVar_file")
 	private String file;

 	private final Map<RevCommit, String> abbreviatedCommits = new HashMap<>();

 	private SimpleDateFormat dateFmt;

 	private int begin;

 	private int end;

 	private BlameResult blame;

 	/** {@inheritDoc} */
 	@Override
 	protected void run() {
 		if (file == null) {
 			if (revision == null) {
 				throw die(CLIText.get().fileIsRequired);
 			}
 			file = revision;
 			revision = null;
 		}

 		boolean autoAbbrev = abbrev == 0;
 		if (abbrev == 0) {
 			abbrev = db.getConfig().getInt("core", "abbrev", 7); //$NON-NLS-1$ //$NON-NLS-2$
 		}
 		if (!showBlankBoundary) {
 			root = db.getConfig().getBoolean("blame", "blankboundary", false); //$NON-NLS-1$ //$NON-NLS-2$
 		}
 		if (!root) {
 			root = db.getConfig().getBoolean("blame", "showroot", false); //$NON-NLS-1$ //$NON-NLS-2$
 		}

 		if (showRawTimestamp) {
 			dateFmt = new SimpleDateFormat("ZZZZ"); //$NON-NLS-1$
 		} else {
 			dateFmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss ZZZZ"); //$NON-NLS-1$
 		}

 		try (ObjectReader reader = db.newObjectReader();
 				BlameGenerator generator = new BlameGenerator(db, file)) {
 			RevFlag scanned = generator.newFlag("SCANNED"); //$NON-NLS-1$
 			generator.setTextComparator(comparator);

 			if (!reverseRange.isEmpty()) {
 				RevCommit rangeStart = null;
 				List<RevCommit> rangeEnd = new ArrayList<>(2);
 				for (RevCommit c : reverseRange) {
 					if (c.has(RevFlag.UNINTERESTING)) {
 						rangeStart = c;
 					} else {
 						rangeEnd.add(c);
 					}
 				}
 				generator.reverse(rangeStart, rangeEnd);
 			} else if (revision != null) {
 				generator.push(null, db.resolve(revision + "^{commit}")); //$NON-NLS-1$
 			} else {
 				generator.push(null, db.resolve(Constants.HEAD));
 				if (!db.isBare()) {
 					DirCache dc = db.readDirCache();
 					int entry = dc.findEntry(file);
 					if (0 <= entry) {
 						generator.push(null, dc.getEntry(entry).getObjectId());
 					}

 					File inTree = new File(db.getWorkTree(), file);
 					if (db.getFS().isFile(inTree)) {
 						generator.push(null, new RawText(inTree));
 					}
 				}
 			}

 			blame = BlameResult.create(generator);
 			begin = 0;
 			end = blame.getResultContents().size();
 			if (rangeString != null) {
 				parseLineRangeOption();
 			}
 			blame.computeRange(begin, end);

 			int authorWidth = 8;
 			int dateWidth = 8;
 			int pathWidth = 1;
 			int maxSourceLine = 1;
 			for (int line = begin; line < end; line++) {
 				RevCommit c = blame.getSourceCommit(line);
 				if (c != null && !c.has(scanned)) {
 					c.add(scanned);
 					if (autoAbbrev) {
 						abbrev = Math.max(abbrev, uniqueAbbrevLen(reader, c));
 					}
 					authorWidth = Math.max(authorWidth, author(line).length());
 					dateWidth = Math.max(dateWidth, date(line).length());
 					pathWidth = Math.max(pathWidth, path(line).length());
 				}
 				while (line + 1 < end
 						&& sameCommit(blame.getSourceCommit(line + 1), c)) {
 					line++;
 				}
 				maxSourceLine = Math.max(maxSourceLine, blame.getSourceLine(line));
 			}

 			String pathFmt = MessageFormat.format(" %{0}s", valueOf(pathWidth)); //$NON-NLS-1$
 			String numFmt = MessageFormat.format(" %{0}d", //$NON-NLS-1$
 					valueOf(1 + (int) Math.log10(maxSourceLine + 1)));
 			String lineFmt = MessageFormat.format(" %{0}d) ", //$NON-NLS-1$
 					valueOf(1 + (int) Math.log10(end + 1)));
 			String authorFmt = MessageFormat.format(" (%-{0}s %{1}s", //$NON-NLS-1$
 					valueOf(authorWidth), valueOf(dateWidth));

 			for (int line = begin; line < end;) {
 				RevCommit c = blame.getSourceCommit(line);
 				String commit = abbreviate(reader, c);
 				String author = null;
 				String date = null;
 				if (!noAuthor) {
 					author = author(line);
 					date = date(line);
 				}
 				do {
 					outw.print(commit);
 					if (showSourcePath) {
 						outw.format(pathFmt, path(line));
 					}
 					if (showSourceLine) {
 						outw.format(numFmt, valueOf(blame.getSourceLine(line) + 1));
 					}
 					if (!noAuthor) {
 						outw.format(authorFmt, author, date);
 					}
 					outw.format(lineFmt, valueOf(line + 1));
 					outw.flush();
 					blame.getResultContents().writeLine(outs, line);
 					outs.flush();
 					outw.print('\n');
 				} while (++line < end
 						&& sameCommit(blame.getSourceCommit(line), c));
 			}
 		} catch (NoWorkTreeException | IOException e) {
 			throw die(e.getMessage(), e);
 		}
 	}

 	@SuppressWarnings("ReferenceEquality")
 	private static boolean sameCommit(RevCommit a, RevCommit b) {
 		// Reference comparison is intentional; BlameGenerator uses a single
 		// RevWalk which caches the RevCommit objects, and if a given commit
 		// is cached the RevWalk returns the same instance.
 		return a == b;
 	}

 	private int uniqueAbbrevLen(ObjectReader reader, RevCommit commit)
 			throws IOException {
 		return reader.abbreviate(commit, abbrev).length();
 	}

 	private void parseLineRangeOption() {
 		String beginStr, endStr;
 		if (rangeString.startsWith("/")) { //$NON-NLS-1$
 			int c = rangeString.indexOf("/,", 1); //$NON-NLS-1$
 			if (c < 0) {
 				beginStr = rangeString;
 				endStr = String.valueOf(end);
 			} else {
 				beginStr = rangeString.substring(0, c);
 				endStr = rangeString.substring(c + 2);
 			}

 		} else {
 			int c = rangeString.indexOf(',');
 			if (c < 0) {
 				beginStr = rangeString;
 				endStr = String.valueOf(end);
 			} else if (c == 0) {
 				beginStr = "0"; //$NON-NLS-1$
 				endStr = rangeString.substring(1);
 			} else {
 				beginStr = rangeString.substring(0, c);
 				endStr = rangeString.substring(c + 1);
 			}
 		}

 		if (beginStr.isEmpty())
 			begin = 0;
 		else if (beginStr.startsWith("/")) //$NON-NLS-1$
 			begin = findLine(0, beginStr);
 		else
 			begin = Math.max(0, Integer.parseInt(beginStr) - 1);

 		if (endStr.isEmpty())
 			end = blame.getResultContents().size();
 		else if (endStr.startsWith("/")) //$NON-NLS-1$
 			end = findLine(begin, endStr);
 		else if (endStr.startsWith("-")) //$NON-NLS-1$
 			end = begin + Integer.parseInt(endStr);
 		else if (endStr.startsWith("+")) //$NON-NLS-1$
 			end = begin + Integer.parseInt(endStr.substring(1));
 		else
 			end = Math.max(0, Integer.parseInt(endStr) - 1);
 	}

 	private int findLine(int b, String regex) {
 		String re = regex.substring(1, regex.length() - 1);
 		if (!re.startsWith("^")) //$NON-NLS-1$
 			re = ".*" + re; //$NON-NLS-1$
 		if (!re.endsWith("$")) //$NON-NLS-1$
 			re = re + ".*"; //$NON-NLS-1$
 		Pattern p = Pattern.compile(re);
 		RawText text = blame.getResultContents();
 		for (int line = b; line < text.size(); line++) {
 			if (p.matcher(text.getString(line)).matches())
 				return line;
 		}
 		return b;
 	}

 	private String path(int line) {
 		String p = blame.getSourcePath(line);
 		return p != null ? p : ""; //$NON-NLS-1$
 	}

 	private String author(int line) {
 		PersonIdent author = blame.getSourceAuthor(line);
 		if (author == null)
 			return ""; //$NON-NLS-1$
 		String name = showAuthorEmail ? author.getEmailAddress() : author
 				.getName();
 		return name != null ? name : ""; //$NON-NLS-1$
 	}

 	private String date(int line) {
 		if (blame.getSourceCommit(line) == null)
 			return ""; //$NON-NLS-1$

 		PersonIdent author = blame.getSourceAuthor(line);
 		if (author == null)
 			return ""; //$NON-NLS-1$

 		dateFmt.setTimeZone(author.getTimeZone());
 		if (!showRawTimestamp)
 			return dateFmt.format(author.getWhen());
 		return String.format("%d %s", //$NON-NLS-1$
 				valueOf(author.getWhen().getTime() / 1000L),
 				dateFmt.format(author.getWhen()));
 	}

 	private String abbreviate(ObjectReader reader, RevCommit commit)
 			throws IOException {
 		String r = abbreviatedCommits.get(commit);
 		if (r != null)
 			return r;

 		if (showBlankBoundary && commit.getParentCount() == 0)
 			commit = null;

 		if (commit == null) {
 			int len = showLongRevision ? OBJECT_ID_STRING_LENGTH : (abbrev + 1);
 			StringBuilder b = new StringBuilder(len);
 			for (int i = 0; i < len; i++)
 				b.append(' ');
 			r = b.toString();

 		} else if (!root && commit.getParentCount() == 0) {
 			if (showLongRevision)
 				r = "^" + commit.name().substring(0, OBJECT_ID_STRING_LENGTH - 1); //$NON-NLS-1$
 			else
 				r = "^" + reader.abbreviate(commit, abbrev).name(); //$NON-NLS-1$
 		} else {
 			if (showLongRevision)
 				r = commit.name();
 			else
 				r = reader.abbreviate(commit, abbrev + 1).name();
 		}

 		abbreviatedCommits.put(commit, r);
 		return r;
 	}
 }
	/*
	* Copyright (C) 2011, Google Inc.
	* Copyright (C) 2009, Christian Halstrick <christian.halstrick@sap.com>
	* Copyright (C) 2009, Johannes E. Schindelin
	* Copyright (C) 2009, Johannes Schindelin <johannes.schindelin@gmx.de>
	* and other copyright owners as documented in the project's IP log.
	*
	* This program and the accompanying materials are made available
	* under the terms of the Eclipse Distribution License v1.0 which
	* accompanies this distribution, is reproduced below, and is
	* available at http://www.eclipse.org/org/documents/edl-v10.php
	*
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or
	* without modification, are permitted provided that the following
	* conditions are met:
	*
	* - Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	*
	* - Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following
	* disclaimer in the documentation and/or other materials provided
	* with the distribution.
	*
	* - Neither the name of the Eclipse Foundation, Inc. nor the
	* names of its contributors may be used to endorse or promote
	* products derived from this software without specific prior
	* written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
	* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
	* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
	* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
	* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	package org.eclipse.jgit.pgm;

	import static java.lang.Integer.valueOf;
	import static java.lang.Long.valueOf;
	import static org.eclipse.jgit.lib.Constants.OBJECT_ID_STRING_LENGTH;

	import java.io.File;
	import java.io.IOException;
	import java.text.MessageFormat;
	import java.text.SimpleDateFormat;
	import java.util.ArrayList;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;
	import java.util.regex.Pattern;

	import org.eclipse.jgit.blame.BlameGenerator;
	import org.eclipse.jgit.blame.BlameResult;
	import org.eclipse.jgit.diff.RawText;
	import org.eclipse.jgit.diff.RawTextComparator;
	import org.eclipse.jgit.dircache.DirCache;
	import org.eclipse.jgit.errors.NoWorkTreeException;
	import org.eclipse.jgit.lib.Constants;
	import org.eclipse.jgit.lib.ObjectReader;
	import org.eclipse.jgit.lib.PersonIdent;
	import org.eclipse.jgit.pgm.internal.CLIText;
	import org.eclipse.jgit.revwalk.RevCommit;
	import org.eclipse.jgit.revwalk.RevFlag;
	import org.kohsuke.args4j.Argument;
	import org.kohsuke.args4j.Option;

	@Command(common = false, usage = "usage_Blame")
	class Blame extends TextBuiltin {
	private RawTextComparator comparator = RawTextComparator.DEFAULT;

	@Option(name = "-w", usage = "usage_ignoreWhitespace")
	void ignoreAllSpace(@SuppressWarnings("unused") boolean on) {
	comparator = RawTextComparator.WS_IGNORE_ALL;
	}

	@Option(name = "--abbrev", metaVar = "metaVar_n", usage = "usage_abbrevCommits")
	private int abbrev;

	@Option(name = "-l", usage = "usage_blameLongRevision")
	private boolean showLongRevision;

	@Option(name = "-t", usage = "usage_blameRawTimestamp")
	private boolean showRawTimestamp;

	@Option(name = "-b", usage = "usage_blameShowBlankBoundary")
	private boolean showBlankBoundary;

	@Option(name = "-s", usage = "usage_blameSuppressAuthor")
	private boolean noAuthor;

	@Option(name = "--show-email", aliases = { "-e" }, usage = "usage_blameShowEmail")
	private boolean showAuthorEmail;

	@Option(name = "--show-name", aliases = { "-f" }, usage = "usage_blameShowSourcePath")
	private boolean showSourcePath;

	@Option(name = "--show-number", aliases = { "-n" }, usage = "usage_blameShowSourceLine")
	private boolean showSourceLine;

	@Option(name = "--root", usage = "usage_blameShowRoot")
	private boolean root;

	@Option(name = "-L", metaVar = "metaVar_blameL", usage = "usage_blameRange")
	private String rangeString;

	@Option(name = "--reverse", metaVar = "metaVar_blameReverse", usage = "usage_blameReverse")
	private List<RevCommit> reverseRange = new ArrayList<>(2);

	@Argument(index = 0, required = false, metaVar = "metaVar_revision")
	private String revision;

	@Argument(index = 1, required = false, metaVar = "metaVar_file")
	private String file;

	private final Map<RevCommit, String> abbreviatedCommits = new HashMap<>();

	private SimpleDateFormat dateFmt;

	private int begin;

	private int end;

	private BlameResult blame;

	/** {@inheritDoc} */
	@Override
	protected void run() {
	if (file == null) {
	if (revision == null) {
	throw die(CLIText.get().fileIsRequired);
	}
	file = revision;
	revision = null;
	}

	boolean autoAbbrev = abbrev == 0;
	if (abbrev == 0) {
	abbrev = db.getConfig().getInt("core", "abbrev", 7); //$NON-NLS-1$ //$NON-NLS-2$
	}
	if (!showBlankBoundary) {
	root = db.getConfig().getBoolean("blame", "blankboundary", false); //$NON-NLS-1$ //$NON-NLS-2$
	}
	if (!root) {
	root = db.getConfig().getBoolean("blame", "showroot", false); //$NON-NLS-1$ //$NON-NLS-2$
	}

	if (showRawTimestamp) {
	dateFmt = new SimpleDateFormat("ZZZZ"); //$NON-NLS-1$
	} else {
	dateFmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss ZZZZ"); //$NON-NLS-1$
	}

	try (ObjectReader reader = db.newObjectReader();
	BlameGenerator generator = new BlameGenerator(db, file)) {
	RevFlag scanned = generator.newFlag("SCANNED"); //$NON-NLS-1$
	generator.setTextComparator(comparator);

	if (!reverseRange.isEmpty()) {
	RevCommit rangeStart = null;
	List<RevCommit> rangeEnd = new ArrayList<>(2);
	for (RevCommit c : reverseRange) {
	if (c.has(RevFlag.UNINTERESTING)) {
	rangeStart = c;
	} else {
	rangeEnd.add(c);
	}
	}
	generator.reverse(rangeStart, rangeEnd);
	} else if (revision != null) {
	generator.push(null, db.resolve(revision + "^{commit}")); //$NON-NLS-1$
	} else {
	generator.push(null, db.resolve(Constants.HEAD));
	if (!db.isBare()) {
	DirCache dc = db.readDirCache();
	int entry = dc.findEntry(file);
	if (0 <= entry) {
	generator.push(null, dc.getEntry(entry).getObjectId());
	}

	File inTree = new File(db.getWorkTree(), file);
	if (db.getFS().isFile(inTree)) {
	generator.push(null, new RawText(inTree));
	}
	}
	}

	blame = BlameResult.create(generator);
	begin = 0;
	end = blame.getResultContents().size();
	if (rangeString != null) {
	parseLineRangeOption();
	}
	blame.computeRange(begin, end);

	int authorWidth = 8;
	int dateWidth = 8;
	int pathWidth = 1;
	int maxSourceLine = 1;
	for (int line = begin; line < end; line++) {
	RevCommit c = blame.getSourceCommit(line);
	if (c != null && !c.has(scanned)) {
	c.add(scanned);
	if (autoAbbrev) {
	abbrev = Math.max(abbrev, uniqueAbbrevLen(reader, c));
	}
	authorWidth = Math.max(authorWidth, author(line).length());
	dateWidth = Math.max(dateWidth, date(line).length());
	pathWidth = Math.max(pathWidth, path(line).length());
	}
	while (line + 1 < end
	&& sameCommit(blame.getSourceCommit(line + 1), c)) {
	line++;
	}
	maxSourceLine = Math.max(maxSourceLine, blame.getSourceLine(line));
	}

	String pathFmt = MessageFormat.format(" %{0}s", valueOf(pathWidth)); //$NON-NLS-1$
	String numFmt = MessageFormat.format(" %{0}d", //$NON-NLS-1$
	valueOf(1 + (int) Math.log10(maxSourceLine + 1)));
	String lineFmt = MessageFormat.format(" %{0}d) ", //$NON-NLS-1$
	valueOf(1 + (int) Math.log10(end + 1)));
	String authorFmt = MessageFormat.format(" (%-{0}s %{1}s", //$NON-NLS-1$
	valueOf(authorWidth), valueOf(dateWidth));

	for (int line = begin; line < end;) {
	RevCommit c = blame.getSourceCommit(line);
	String commit = abbreviate(reader, c);
	String author = null;
	String date = null;
	if (!noAuthor) {
	author = author(line);
	date = date(line);
	}
	do {
	outw.print(commit);
	if (showSourcePath) {
	outw.format(pathFmt, path(line));
	}
	if (showSourceLine) {
	outw.format(numFmt, valueOf(blame.getSourceLine(line) + 1));
	}
	if (!noAuthor) {
	outw.format(authorFmt, author, date);
	}
	outw.format(lineFmt, valueOf(line + 1));
	outw.flush();
	blame.getResultContents().writeLine(outs, line);
	outs.flush();
	outw.print('\n');
	} while (++line < end
	&& sameCommit(blame.getSourceCommit(line), c));
	}
	} catch (NoWorkTreeException \| IOException e) {
	throw die(e.getMessage(), e);
	}
	}

	@SuppressWarnings("ReferenceEquality")
	private static boolean sameCommit(RevCommit a, RevCommit b) {
	// Reference comparison is intentional; BlameGenerator uses a single
	// RevWalk which caches the RevCommit objects, and if a given commit
	// is cached the RevWalk returns the same instance.
	return a == b;
	}

	private int uniqueAbbrevLen(ObjectReader reader, RevCommit commit)
	throws IOException {
	return reader.abbreviate(commit, abbrev).length();
	}

	private void parseLineRangeOption() {
	String beginStr, endStr;
	if (rangeString.startsWith("/")) { //$NON-NLS-1$
	int c = rangeString.indexOf("/,", 1); //$NON-NLS-1$
	if (c < 0) {
	beginStr = rangeString;
	endStr = String.valueOf(end);
	} else {
	beginStr = rangeString.substring(0, c);
	endStr = rangeString.substring(c + 2);
	}

	} else {
	int c = rangeString.indexOf(',');
	if (c < 0) {
	beginStr = rangeString;
	endStr = String.valueOf(end);
	} else if (c == 0) {
	beginStr = "0"; //$NON-NLS-1$
	endStr = rangeString.substring(1);
	} else {
	beginStr = rangeString.substring(0, c);
	endStr = rangeString.substring(c + 1);
	}
	}

	if (beginStr.isEmpty())
	begin = 0;
	else if (beginStr.startsWith("/")) //$NON-NLS-1$
	begin = findLine(0, beginStr);
	else
	begin = Math.max(0, Integer.parseInt(beginStr) - 1);

	if (endStr.isEmpty())
	end = blame.getResultContents().size();
	else if (endStr.startsWith("/")) //$NON-NLS-1$
	end = findLine(begin, endStr);
	else if (endStr.startsWith("-")) //$NON-NLS-1$
	end = begin + Integer.parseInt(endStr);
	else if (endStr.startsWith("+")) //$NON-NLS-1$
	end = begin + Integer.parseInt(endStr.substring(1));
	else
	end = Math.max(0, Integer.parseInt(endStr) - 1);
	}

	private int findLine(int b, String regex) {
	String re = regex.substring(1, regex.length() - 1);
	if (!re.startsWith("^")) //$NON-NLS-1$
	re = ".*" + re; //$NON-NLS-1$
	if (!re.endsWith("$")) //$NON-NLS-1$
	re = re + ".*"; //$NON-NLS-1$
	Pattern p = Pattern.compile(re);
	RawText text = blame.getResultContents();
	for (int line = b; line < text.size(); line++) {
	if (p.matcher(text.getString(line)).matches())
	return line;
	}
	return b;
	}

	private String path(int line) {
	String p = blame.getSourcePath(line);
	return p != null ? p : ""; //$NON-NLS-1$
	}

	private String author(int line) {
	PersonIdent author = blame.getSourceAuthor(line);
	if (author == null)
	return ""; //$NON-NLS-1$
	String name = showAuthorEmail ? author.getEmailAddress() : author
	.getName();
	return name != null ? name : ""; //$NON-NLS-1$
	}

	private String date(int line) {
	if (blame.getSourceCommit(line) == null)
	return ""; //$NON-NLS-1$

	PersonIdent author = blame.getSourceAuthor(line);
	if (author == null)
	return ""; //$NON-NLS-1$

	dateFmt.setTimeZone(author.getTimeZone());
	if (!showRawTimestamp)
	return dateFmt.format(author.getWhen());
	return String.format("%d %s", //$NON-NLS-1$
	valueOf(author.getWhen().getTime() / 1000L),
	dateFmt.format(author.getWhen()));
	}

	private String abbreviate(ObjectReader reader, RevCommit commit)
	throws IOException {
	String r = abbreviatedCommits.get(commit);
	if (r != null)
	return r;

	if (showBlankBoundary && commit.getParentCount() == 0)
	commit = null;

	if (commit == null) {
	int len = showLongRevision ? OBJECT_ID_STRING_LENGTH : (abbrev + 1);
	StringBuilder b = new StringBuilder(len);
	for (int i = 0; i < len; i++)
	b.append(' ');
	r = b.toString();

	} else if (!root && commit.getParentCount() == 0) {
	if (showLongRevision)
	r = "^" + commit.name().substring(0, OBJECT_ID_STRING_LENGTH - 1); //$NON-NLS-1$
	else
	r = "^" + reader.abbreviate(commit, abbrev).name(); //$NON-NLS-1$
	} else {
	if (showLongRevision)
	r = commit.name();
	else
	r = reader.abbreviate(commit, abbrev + 1).name();
	}

	abbreviatedCommits.put(commit, r);
	return r;
	}
	}