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/*
* Copyright (C) 2013, Christian Halstrick <christian.halstrick@sap.com> and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.lib;
import static java.nio.charset.StandardCharsets.UTF_8;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.LinkedList;
import java.util.List;
import org.eclipse.jgit.lib.RebaseTodoLine.Action;
import org.eclipse.jgit.util.IO;
import org.eclipse.jgit.util.RawParseUtils;
/**
* Offers methods to read and write files formatted like the git-rebase-todo
* file
*
* @since 3.2
*/
public class RebaseTodoFile {
private Repository repo;
/**
* Constructor for RebaseTodoFile.
*
* @param repo
* a {@link org.eclipse.jgit.lib.Repository} object.
*/
public RebaseTodoFile(Repository repo) {
this.repo = repo;
}
/**
* Read a file formatted like the git-rebase-todo file. The "done" file is
* also formatted like the git-rebase-todo file. These files can be found in
* .git/rebase-merge/ or .git/rebase-append/ folders.
*
* @param path
* path to the file relative to the repository's git-dir. E.g.
* "rebase-merge/git-rebase-todo" or "rebase-append/done"
* @param includeComments
* <code>true</code> if also comments should be reported
* @return the list of steps
* @throws java.io.IOException
*/
public List<RebaseTodoLine> readRebaseTodo(String path,
boolean includeComments) throws IOException {
byte[] buf = IO.readFully(new File(repo.getDirectory(), path));
int ptr = 0;
int tokenBegin = 0;
List<RebaseTodoLine> r = new LinkedList<>();
while (ptr < buf.length) {
tokenBegin = ptr;
ptr = RawParseUtils.nextLF(buf, ptr);
int lineStart = tokenBegin;
int lineEnd = ptr - 2;
if (lineEnd >= 0 && buf[lineEnd] == '\r')
lineEnd--;
// Handle comments
if (buf[tokenBegin] == '#') {
if (includeComments)
parseComments(buf, tokenBegin, r, lineEnd);
} else {
// skip leading spaces+tabs+cr
tokenBegin = nextParsableToken(buf, tokenBegin, lineEnd);
// Handle empty lines (maybe empty after skipping leading
// whitespace)
if (tokenBegin == -1) {
if (includeComments)
r.add(new RebaseTodoLine(RawParseUtils.decode(buf,
lineStart, 1 + lineEnd)));
continue;
}
RebaseTodoLine line = parseLine(buf, tokenBegin, lineEnd);
if (line == null)
continue;
r.add(line);
}
}
return r;
}
private static void parseComments(byte[] buf, int tokenBegin,
List<RebaseTodoLine> r, int lineEnd) {
RebaseTodoLine line = null;
String commentString = RawParseUtils.decode(buf,
tokenBegin, lineEnd + 1);
try {
int skip = tokenBegin + 1; // skip '#'
skip = nextParsableToken(buf, skip, lineEnd);
if (skip != -1) {
// try to parse the line as non-comment
line = parseLine(buf, skip, lineEnd);
if (line != null) {
// successfully parsed as non-comment line
// mark this line as a comment explicitly
line.setAction(Action.COMMENT);
// use the read line as comment string
line.setComment(commentString);
}
}
} catch (Exception e) {
// parsing as non-comment line failed
line = null;
} finally {
if (line == null)
line = new RebaseTodoLine(commentString);
r.add(line);
}
}
/**
* Skip leading space, tab, CR and LF characters
*
* @param buf
* @param tokenBegin
* @param lineEnd
* @return the token within the range of the given {@code buf} that doesn't
* need to be skipped, {@code -1} if no such token found within the
* range (i.e. empty line)
*/
private static int nextParsableToken(byte[] buf, int tokenBegin, int lineEnd) {
while (tokenBegin <= lineEnd
&& (buf[tokenBegin] == ' ' || buf[tokenBegin] == '\t' || buf[tokenBegin] == '\r'))
tokenBegin++;
if (tokenBegin > lineEnd)
return -1;
return tokenBegin;
}
private static RebaseTodoLine parseLine(byte[] buf, int tokenBegin,
int lineEnd) {
RebaseTodoLine.Action action = null;
AbbreviatedObjectId commit = null;
int nextSpace = RawParseUtils.next(buf, tokenBegin, ' ');
int tokenCount = 0;
while (tokenCount < 3 && nextSpace <= lineEnd) {
switch (tokenCount) {
case 0:
String actionToken = new String(buf, tokenBegin,
nextSpace - tokenBegin - 1, UTF_8);
tokenBegin = nextSpace;
action = RebaseTodoLine.Action.parse(actionToken);
if (action == null)
return null; // parsing failed
break;
case 1:
nextSpace = RawParseUtils.next(buf, tokenBegin, ' ');
String commitToken;
if (nextSpace > lineEnd + 1) {
commitToken = new String(buf, tokenBegin,
lineEnd - tokenBegin + 1, UTF_8);
} else {
commitToken = new String(buf, tokenBegin,
nextSpace - tokenBegin - 1, UTF_8);
}
tokenBegin = nextSpace;
commit = AbbreviatedObjectId.fromString(commitToken);
break;
case 2:
return new RebaseTodoLine(action, commit,
RawParseUtils.decode(buf, tokenBegin, 1 + lineEnd));
}
tokenCount++;
}
if (tokenCount == 2)
return new RebaseTodoLine(action, commit, ""); //$NON-NLS-1$
return null;
}
/**
* Write a file formatted like a git-rebase-todo file.
*
* @param path
* path to the file relative to the repository's git-dir. E.g.
* "rebase-merge/git-rebase-todo" or "rebase-append/done"
* @param steps
* the steps to be written
* @param append
* whether to append to an existing file or to write a new file
* @throws java.io.IOException
*/
public void writeRebaseTodoFile(String path, List<RebaseTodoLine> steps,
boolean append) throws IOException {
try (OutputStream fw = new BufferedOutputStream(new FileOutputStream(
new File(repo.getDirectory(), path), append))) {
StringBuilder sb = new StringBuilder();
for (RebaseTodoLine step : steps) {
sb.setLength(0);
if (RebaseTodoLine.Action.COMMENT.equals(step.action))
sb.append(step.getComment());
else {
sb.append(step.getAction().toToken());
sb.append(" "); //$NON-NLS-1$
sb.append(step.getCommit().name());
sb.append(" "); //$NON-NLS-1$
sb.append(step.getShortMessage().trim());
}
sb.append('\n');
fw.write(Constants.encode(sb.toString()));
}
}
}
}
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