gistfile1.java

public String diff(String file, String left, String right)
            throws IOException, SubversionException {
        if (log.isDebugEnabled()) {
            log.debug("diff " + file + " " + left + " " + right);
        }

        StringBuffer tag1 = new StringBuffer().append(getValue("svn.document.root"));
        if (MAINBOOK.equals(type)) {
            tag1.append(getValue("svn.tags.path"));
        } else if (PASIENT.equals(type)) {
            tag1.append(getValue("svn.tags.pasient.path"));
        } else if (VETERINAR.equals(type)) {
            tag1.append(getValue("svn.tags.vet.path"));
        } else {
            throw new SubversionException("Type " + type + " unknown");
        }
        tag1.append('/');

        if (left == null) {
            // Then we want latest live
            tag1.append(getLatestLiveTag());
        } else {
            tag1.append(left);
        }

        StringBuffer tag2 = new StringBuffer().append(getValue("svn.document.root"));

        if (right == null) {
            // Then we want latest test
            if (MAINBOOK.equals(type)) {
                tag2.append(getValue("svn.trunk.path"));
            } else if (PASIENT.equals(type)) {
                tag2.append(getValue("svn.trunk.pasient.path"));
            } else if (VETERINAR.equals(type)) {
                tag2.append(getValue("svn.trunk.vet.path"));
            } else {
                throw new SubversionException("Type " + type + " unknown");
            }
        } else {
            if (MAINBOOK.equals(type)) {
                tag2.append(getValue("svn.working.tag.path"));
            } else if (PASIENT.equals(type)) {
                tag2.append(getValue("svn.working.tag.pasient.path"));
            } else if (VETERINAR.equals(type)) {
                tag2.append(getValue("svn.working.tag.vet.path"));
            } else {
                throw new SubversionException("Type " + type + " unknown");
            }

            tag2.append('/');
            tag2.append(right);
        }

        String[] command = new String[]{"svn",
                "diff",
                "--diff-cmd",
                getValue("svn.diff.path"),
                tag1.append("/web/content").append(file).toString(),
                tag2.append("/web/content").append(file).toString()};

        Iterator iter = run(command).iterator();

        StringBuffer content = new StringBuffer();

        if (iter.hasNext()) {
            // Strip the first two lines off - svn's diff header info
            iter.next();
            iter.next();

            while (iter.hasNext()) {
                content.append((String) iter.next()).append('\n');
            }
        }

        return content.toString();
    }