package com.gitblit.utils;
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import static org.eclipse.jgit.lib.Constants.encodeASCII;
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import java.io.IOException;
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import java.io.OutputStream;
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import org.eclipse.jgit.diff.DiffFormatter;
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import org.eclipse.jgit.diff.RawText;
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public class HtmlDiffFormatter extends DiffFormatter {
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private final OutputStream os;
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public HtmlDiffFormatter(OutputStream os) {
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super(os);
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this.os = os;
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}
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/**
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* Output a hunk header
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*
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* @param aStartLine
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* within first source
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* @param aEndLine
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* within first source
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* @param bStartLine
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* within second source
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* @param bEndLine
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* within second source
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* @throws IOException
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*/
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@Override
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protected void writeHunkHeader(int aStartLine, int aEndLine, int bStartLine, int bEndLine) throws IOException {
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os.write("<div class=\"diff hunk_header\"><span class=\"diff hunk_info\">".getBytes());
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os.write('@');
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os.write('@');
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writeRange('-', aStartLine + 1, aEndLine - aStartLine);
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writeRange('+', bStartLine + 1, bEndLine - bStartLine);
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os.write(' ');
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os.write('@');
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os.write('@');
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// TODO not sure if JGit can determine hunk section
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//os.write("<span class=\"diff hunk_section\">".getBytes());
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//os.write("</span>".getBytes());
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os.write("</span></div>".getBytes());
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}
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private void writeRange(final char prefix, final int begin, final int cnt) throws IOException {
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os.write(' ');
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os.write(prefix);
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switch (cnt) {
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case 0:
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// If the range is empty, its beginning number must
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// be the
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// line just before the range, or 0 if the range is
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// at the
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// start of the file stream. Here, begin is always 1
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// based,
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// so an empty file would produce "0,0".
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//
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os.write(encodeASCII(begin - 1));
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os.write(',');
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os.write('0');
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break;
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case 1:
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// If the range is exactly one line, produce only
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// the number.
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//
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os.write(encodeASCII(begin));
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break;
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default:
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os.write(encodeASCII(begin));
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os.write(',');
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os.write(encodeASCII(cnt));
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break;
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}
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}
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@Override
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protected void writeLine(final char prefix, final RawText text, final int cur) throws IOException {
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switch (prefix) {
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case '+':
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os.write("<div class=\"diff add\">".getBytes());
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break;
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case '-':
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os.write("<div class=\"diff remove\">".getBytes());
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break;
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}
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os.write(prefix);
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text.writeLine(os, cur);
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switch (prefix) {
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case '+':
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case '-':
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os.write("</div>".getBytes());
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break;
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default:
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os.write('\n');
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}
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}
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/**
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* Workaround function for complex private methods in DiffFormatter. This
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* sets the html for the diff headers.
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*
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* @return
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*/
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public String getHtml() {
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String html = os.toString();
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String[] lines = html.split("\n");
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StringBuilder sb = new StringBuilder();
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sb.append("<div class=\"diff\">");
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for (String line : lines) {
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if (line.startsWith("diff")) {
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sb.append("<div class=\"diff header\">").append(line).append("</div>");
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} else if (line.startsWith("---")) {
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sb.append("<div class=\"diff remove\">").append(line).append("</div>");
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} else if (line.startsWith("+++")) {
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sb.append("<div class=\"diff add\">").append(line).append("</div>");
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} else {
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sb.append(line).append('\n');
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}
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}
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sb.append("</div>");
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return sb.toString();
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}
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}
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