James Moger
2011-04-21 a645ba09d693495c50ab0ee0d1fc2734407b73a4
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package com.gitblit.utils;
 
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;
 
import org.eclipse.jgit.diff.DiffEntry;
import org.eclipse.jgit.diff.DiffFormatter;
import org.eclipse.jgit.diff.RawTextComparator;
import org.eclipse.jgit.diff.DiffEntry.ChangeType;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.errors.StopWalkException;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.FileMode;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectLoader;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.StoredConfig;
import org.eclipse.jgit.revwalk.RevBlob;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevObject;
import org.eclipse.jgit.revwalk.RevSort;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.revwalk.filter.RevFilter;
import org.eclipse.jgit.treewalk.TreeWalk;
import org.eclipse.jgit.treewalk.filter.AndTreeFilter;
import org.eclipse.jgit.treewalk.filter.PathFilter;
import org.eclipse.jgit.treewalk.filter.PathFilterGroup;
import org.eclipse.jgit.treewalk.filter.TreeFilter;
import org.eclipse.jgit.util.io.DisabledOutputStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
 
import com.gitblit.wicket.models.Metric;
import com.gitblit.wicket.models.PathModel;
import com.gitblit.wicket.models.PathModel.PathChangeModel;
import com.gitblit.wicket.models.RefModel;
import com.gitblit.wicket.models.TicketModel;
import com.gitblit.wicket.models.TicketModel.Comment;
 
public class JGitUtils {
 
    /** Prefix for notes refs */
    public static final String R_NOTES = "refs/notes/";
 
    /** Standard notes ref */
    public static final String R_NOTES_COMMITS = R_NOTES + "commits";
 
    private final static Logger LOGGER = LoggerFactory.getLogger(JGitUtils.class);
 
    public static List<String> getRepositoryList(File repositoriesFolder, boolean exportAll, boolean readNested) {
        List<String> list = new ArrayList<String>();
        list.addAll(getNestedRepositories(repositoriesFolder, repositoriesFolder, exportAll, readNested));
        Collections.sort(list);
        return list;
    }
 
    public static List<String> getNestedRepositories(File repositoriesFolder, File folder, boolean exportAll, boolean readNested) {
        String basefile = repositoriesFolder.getAbsolutePath();
        List<String> list = new ArrayList<String>();
        for (File file : folder.listFiles()) {
            if (file.isDirectory() && !file.getName().equalsIgnoreCase(Constants.DOT_GIT)) {
                // if this is a git repository add it to the list
                File gitFolder = new File(file, Constants.DOT_GIT);
                boolean isGitRepository = gitFolder.exists() && gitFolder.isDirectory();
                boolean exportRepository = isGitRepository && (exportAll || new File(gitFolder, "git-daemon-export-ok").exists());
 
                if (exportRepository) {
                    // determine repository name relative to repositories folder
                    String filename = file.getAbsolutePath();
                    String repo = filename.substring(basefile.length()).replace('\\', '/');
                    if (repo.charAt(0) == '/') {
                        repo = repo.substring(1);
                    }
                    list.add(repo);
                }
 
                // look for nested repositories
                if (readNested) {
                    list.addAll(getNestedRepositories(repositoriesFolder, file, exportAll, readNested));
                }
            }
        }
        return list;
    }
 
    public static RevCommit getFirstCommit(Repository r, String branch) {
        if (StringUtils.isEmpty(branch)) {
            branch = Constants.HEAD;
        }
        try {
            RevWalk walk = new RevWalk(r);
            walk.sort(RevSort.REVERSE);
            RevCommit head = walk.parseCommit(r.resolve(branch));
            walk.markStart(head);
            RevCommit commit = walk.next();
            walk.dispose();
            return commit;
        } catch (Throwable t) {
            LOGGER.error("Failed to determine first commit", t);
        }
        return null;
    }
 
    public static Date getFirstChange(Repository r, String branch) {
        try {
            RevCommit commit = getFirstCommit(r, branch);
            return getCommitDate(commit);
        } catch (Throwable t) {
            LOGGER.error("Failed to determine first change", t);
        }
        return null;
    }
 
    public static Date getLastChange(Repository r) {
        RevCommit commit = getCommit(r, Constants.HEAD);
        return getCommitDate(commit);
    }
 
    public static RevCommit getCommit(Repository r, String objectId) {
        RevCommit commit = null;
        try {
            if (objectId == null || objectId.trim().length() == 0) {
                objectId = Constants.HEAD;
            }
            ObjectId object = r.resolve(objectId);
            RevWalk walk = new RevWalk(r);
            RevCommit rev = walk.parseCommit(object);
            commit = rev;
            walk.dispose();
        } catch (Throwable t) {
            LOGGER.error("Failed to determine last change", t);
        }
        return commit;
    }
 
    public static Map<ObjectId, List<String>> getAllRefs(Repository r) {
        Map<ObjectId, List<String>> refs = new HashMap<ObjectId, List<String>>();
        Map<AnyObjectId, Set<Ref>> allRefs = r.getAllRefsByPeeledObjectId();
        for (AnyObjectId id : allRefs.keySet()) {
            List<String> list = new ArrayList<String>();
            for (Ref setRef : allRefs.get(id)) {
                String name = setRef.getName();
                list.add(name);
            }
            refs.put(id.toObjectId(), list);
        }
        return refs;
    }
 
    public static Map<ObjectId, List<String>> getRefs(Repository r, String baseRef) {
        Map<ObjectId, List<String>> refs = new HashMap<ObjectId, List<String>>();
        Map<AnyObjectId, Set<Ref>> allRefs = r.getAllRefsByPeeledObjectId();
        for (AnyObjectId id : allRefs.keySet()) {
            List<String> list = new ArrayList<String>();
            for (Ref setRef : allRefs.get(id)) {
                String name = setRef.getName();
                if (name.startsWith(baseRef)) {
                    list.add(name);
                }
            }
            refs.put(id.toObjectId(), list);
        }
        return refs;
    }
 
    /**
     * Lookup an entry stored in a tree, failing if not present.
     * 
     * @param tree
     *            the tree to search.
     * @param path
     *            the path to find the entry of.
     * @return the parsed object entry at this path
     * @throws Exception
     */
    public static RevObject getRevObject(Repository r, final RevTree tree, final String path) {
        RevObject ro = null;
        RevWalk rw = new RevWalk(r);
        TreeWalk tw = new TreeWalk(r);
        tw.setFilter(PathFilterGroup.createFromStrings(Collections.singleton(path)));
        try {
            tw.reset(tree);
            while (tw.next()) {
                if (tw.isSubtree() && !path.equals(tw.getPathString())) {
                    tw.enterSubtree();
                    continue;
                }
                ObjectId entid = tw.getObjectId(0);
                FileMode entmode = tw.getFileMode(0);
                ro = rw.lookupAny(entid, entmode.getObjectType());
                rw.parseBody(ro);
            }
        } catch (Throwable t) {
            LOGGER.error("Can't find " + path + " in tree " + tree.name(), t);
        } finally {
            if (rw != null) {
                rw.dispose();
            }
        }
        return ro;
    }
 
    public static byte[] getRawContent(Repository r, RevBlob blob) {
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
            ObjectLoader ldr = r.open(blob.getId(), Constants.OBJ_BLOB);
            byte[] tmp = new byte[1024];
            InputStream in = ldr.openStream();
            int n;
            while ((n = in.read(tmp)) > 0) {
                os.write(tmp, 0, n);
            }
            in.close();
        } catch (Throwable t) {
            LOGGER.error("Failed to read raw content", t);
        }
        return os.toByteArray();
    }
 
    public static String getRawContentAsString(Repository r, RevBlob blob) {
        return new String(getRawContent(r, blob));
    }
 
    public static String getRawContentAsString(Repository r, RevCommit commit, String blobPath) {
        RevObject obj = getRevObject(r, commit.getTree(), blobPath);
        return new String(getRawContent(r, (RevBlob) obj));
    }
 
    public static List<PathModel> getFilesInPath(Repository r, String basePath, String objectId) {
        RevCommit commit = getCommit(r, objectId);
        return getFilesInPath(r, basePath, commit);
    }
 
    public static List<PathModel> getFilesInPath(Repository r, String basePath, RevCommit commit) {
        List<PathModel> list = new ArrayList<PathModel>();
        final TreeWalk walk = new TreeWalk(r);
        try {
            walk.addTree(commit.getTree());
            if (basePath != null && basePath.length() > 0) {
                PathFilter f = PathFilter.create(basePath);
                walk.setFilter(f);
                walk.setRecursive(false);
                boolean foundFolder = false;
                while (walk.next()) {
                    if (!foundFolder && walk.isSubtree()) {
                        walk.enterSubtree();
                    }
                    if (walk.getPathString().equals(basePath)) {
                        foundFolder = true;
                        continue;
                    }
                    if (foundFolder) {
                        list.add(getPathModel(walk, basePath, commit));
                    }
                }
            } else {
                walk.setRecursive(false);
                while (walk.next()) {
                    list.add(getPathModel(walk, null, commit));
                }
            }
        } catch (IOException e) {
            LOGGER.error("Failed to get files for commit " + commit.getName(), e);
        } finally {
            walk.release();
        }
        Collections.sort(list);
        return list;
    }
 
    public static List<PathChangeModel> getFilesInCommit(Repository r, String commitId) {
        RevCommit commit = getCommit(r, commitId);
        return getFilesInCommit(r, commit);
    }
 
    public static List<PathChangeModel> getFilesInCommit(Repository r, RevCommit commit) {
        List<PathChangeModel> list = new ArrayList<PathChangeModel>();
        try {
            final RevWalk rw = new RevWalk(r);
            RevCommit parent = rw.parseCommit(commit.getParent(0).getId());
            RevTree parentTree = parent.getTree();
            RevTree commitTree = commit.getTree();
 
            final TreeWalk walk = new TreeWalk(r);
            walk.reset();
            walk.setRecursive(true);
            walk.addTree(parentTree);
            walk.addTree(commitTree);
            walk.setFilter(TreeFilter.ANY_DIFF);
 
            RawTextComparator cmp = RawTextComparator.DEFAULT;
            DiffFormatter df = new DiffFormatter(DisabledOutputStream.INSTANCE);
            df.setRepository(r);
            df.setDiffComparator(cmp);
            df.setDetectRenames(true);
            List<DiffEntry> diffs = df.scan(parentTree, commitTree);
            for (DiffEntry diff : diffs) {
                if (diff.getChangeType().equals(ChangeType.DELETE)) {
                    list.add(new PathChangeModel(diff.getOldPath(), diff.getOldPath(), 0, diff.getNewMode().getBits(), commit.getId().getName(), diff.getChangeType()));
                } else {
                    list.add(new PathChangeModel(diff.getNewPath(), diff.getNewPath(), 0, diff.getNewMode().getBits(), commit.getId().getName(), diff.getChangeType()));
                }
            }
        } catch (Throwable t) {
            LOGGER.error("failed to determine files in commit!", t);
        }
        return list;
    }
 
    public static Map<ChangeType, AtomicInteger> getChangedPathsStats(List<PathChangeModel> paths) {
        Map<ChangeType, AtomicInteger> stats = new HashMap<ChangeType, AtomicInteger>();
        for (PathChangeModel path : paths) {
            if (!stats.containsKey(path.changeType)) {
                stats.put(path.changeType, new AtomicInteger(0));
            }
            stats.get(path.changeType).incrementAndGet();
        }
        return stats;
    }
 
    public static enum DiffOutputType {
        PLAIN, GITWEB, GITBLIT;
 
        public static DiffOutputType forName(String name) {
            for (DiffOutputType type : values()) {
                if (type.name().equalsIgnoreCase(name)) {
                    return type;
                }
            }
            return null;
        }
    }
 
    public static String getCommitDiff(Repository r, RevCommit commit, DiffOutputType outputType) {
        return getCommitDiff(r, null, commit, null, outputType);
    }
 
    public static String getCommitDiff(Repository r, RevCommit commit, String path, DiffOutputType outputType) {
        return getCommitDiff(r, null, commit, path, outputType);
    }
 
    public static String getCommitDiff(Repository r, RevCommit baseCommit, RevCommit commit, DiffOutputType outputType) {
        return getCommitDiff(r, baseCommit, commit, null, outputType);
    }
 
    public static String getCommitDiff(Repository r, RevCommit baseCommit, RevCommit commit, String path, DiffOutputType outputType) {
        try {
            RevTree baseTree;
            if (baseCommit == null) {
                final RevWalk rw = new RevWalk(r);
                RevCommit parent = rw.parseCommit(commit.getParent(0).getId());
                rw.dispose();
                baseTree = parent.getTree();
            } else {
                baseTree = baseCommit.getTree();
            }
 
            RevTree commitTree = commit.getTree();
 
            final TreeWalk walk = new TreeWalk(r);
            walk.reset();
            walk.setRecursive(true);
            walk.addTree(baseTree);
            walk.addTree(commitTree);
            walk.setFilter(TreeFilter.ANY_DIFF);
 
            final ByteArrayOutputStream os = new ByteArrayOutputStream();
            RawTextComparator cmp = RawTextComparator.DEFAULT;
            DiffFormatter df;
            switch (outputType) {
            case GITWEB:
                df = new GitWebDiffFormatter(os);
                break;
            case GITBLIT:
                df = new GitBlitDiffFormatter(os);
                break;
            case PLAIN:
            default:
                df = new DiffFormatter(os);
                break;
            }
            df.setRepository(r);
            df.setDiffComparator(cmp);
            df.setDetectRenames(true);
            List<DiffEntry> diffs = df.scan(baseTree, commitTree);
            if (path != null && path.length() > 0) {
                for (DiffEntry diff : diffs) {
                    if (diff.getNewPath().equalsIgnoreCase(path)) {
                        df.format(diff);
                        break;
                    }
                }
            } else {
                df.format(diffs);
            }
            String diff;
            if (df instanceof GitWebDiffFormatter) {
                // workaround for complex private methods in DiffFormatter
                diff = ((GitWebDiffFormatter) df).getHtml();
            } else {
                diff = os.toString();
            }
            df.flush();
            return diff;
        } catch (Throwable t) {
            LOGGER.error("failed to generate commit diff!", t);
        }
        return null;
    }
 
    public static String getCommitPatch(Repository r, RevCommit commit) {
        return getCommitPatch(r, commit);
    }
 
    public static String getCommitPatch(Repository r, RevCommit commit, String path) {
        return getCommitPatch(r, null, commit, path);
    }
 
    public static String getCommitPatch(Repository r, RevCommit baseCommit, RevCommit commit, String path) {
        try {
            RevTree baseTree;
            if (baseCommit == null) {
                final RevWalk rw = new RevWalk(r);
                RevCommit parent = rw.parseCommit(commit.getParent(0).getId());
                baseTree = parent.getTree();
            } else {
                baseTree = baseCommit.getTree();
            }
            RevTree commitTree = commit.getTree();
 
            final TreeWalk walk = new TreeWalk(r);
            walk.reset();
            walk.setRecursive(true);
            walk.addTree(baseTree);
            walk.addTree(commitTree);
            walk.setFilter(TreeFilter.ANY_DIFF);
 
            final ByteArrayOutputStream os = new ByteArrayOutputStream();
            RawTextComparator cmp = RawTextComparator.DEFAULT;
            PatchFormatter df = new PatchFormatter(os);
            df.setRepository(r);
            df.setDiffComparator(cmp);
            df.setDetectRenames(true);
            List<DiffEntry> diffs = df.scan(baseTree, commitTree);
            if (path != null && path.length() > 0) {
                for (DiffEntry diff : diffs) {
                    if (diff.getNewPath().equalsIgnoreCase(path)) {
                        df.format(diff);
                        break;
                    }
                }
            } else {
                df.format(diffs);
            }
            String diff = df.getPatch(commit);
            df.flush();
            return diff;
        } catch (Throwable t) {
            LOGGER.error("failed to generate commit diff!", t);
        }
        return null;
    }
 
    private static PathModel getPathModel(TreeWalk walk, String basePath, RevCommit commit) {
        String name;
        long size = 0;
        if (basePath == null) {
            name = walk.getPathString();
        } else {
            try {
                name = walk.getPathString().substring(basePath.length() + 1);
            } catch (Throwable t) {
                name = walk.getPathString();
            }
        }
        try {
            if (!walk.isSubtree()) {
                size = walk.getObjectReader().getObjectSize(walk.getObjectId(0), Constants.OBJ_BLOB);
            }
        } catch (Throwable t) {
            LOGGER.error("Failed to retrieve blob size", t);
        }
        return new PathModel(name, walk.getPathString(), size, walk.getFileMode(0).getBits(), commit.getName());
    }
 
    public static String getPermissionsFromMode(int mode) {
        if (FileMode.TREE.equals(mode)) {
            return "drwxr-xr-x";
        } else if (FileMode.REGULAR_FILE.equals(mode)) {
            return "-rw-r--r--";
        } else if (FileMode.EXECUTABLE_FILE.equals(mode)) {
            return "-rwxr-xr-x";
        } else if (FileMode.SYMLINK.equals(mode)) {
            // FIXME symlink permissions
            return "symlink";
        } else if (FileMode.GITLINK.equals(mode)) {
            // FIXME gitlink permissions
            return "gitlink";
        } else if (FileMode.MISSING.equals(mode)) {
            // FIXME missing permissions
            return "missing";
        }
        return "" + mode;
    }
 
    public static boolean isTreeFromMode(int mode) {
        return FileMode.TREE.equals(mode);
    }
 
    public static List<RevCommit> getRevLog(Repository r, int maxCount) {
        return getRevLog(r, Constants.HEAD, 0, maxCount);
    }
 
    public static List<RevCommit> getRevLog(Repository r, String objectId, int offset, int maxCount) {
        return getRevLog(r, objectId, null, offset, maxCount);
    }
 
    public static List<RevCommit> getRevLog(Repository r, String objectId, String path, int offset, int maxCount) {
        List<RevCommit> list = new ArrayList<RevCommit>();
        try {
            if (objectId == null || objectId.trim().length() == 0) {
                objectId = Constants.HEAD;
            }
            RevWalk walk = new RevWalk(r);
            ObjectId object = r.resolve(objectId);
            walk.markStart(walk.parseCommit(object));
            if (!StringUtils.isEmpty(path)) {
                TreeFilter filter = AndTreeFilter.create(PathFilterGroup.createFromStrings(Collections.singleton(path)), TreeFilter.ANY_DIFF);
                walk.setTreeFilter(filter);
            }
            Iterable<RevCommit> revlog = walk;
            if (offset > 0) {
                int count = 0;
                for (RevCommit rev : revlog) {
                    count++;
                    if (count > offset) {
                        list.add(rev);
                        if (maxCount > 0 && list.size() == maxCount) {
                            break;
                        }
                    }
                }
            } else {
                for (RevCommit rev : revlog) {
                    list.add(rev);
                    if (maxCount > 0 && list.size() == maxCount) {
                        break;
                    }
                }
            }
            walk.dispose();
        } catch (Throwable t) {
            LOGGER.error("Failed to determine last change", t);
        }
        return list;
    }
 
    public static enum SearchType {
        AUTHOR, COMMITTER, COMMIT;
 
        public static SearchType forName(String name) {
            for (SearchType type : values()) {
                if (type.name().equalsIgnoreCase(name)) {
                    return type;
                }
            }
            return null;
        }
 
        public String toString() {
            return name().toLowerCase();
        }
    }
 
    public static List<RevCommit> searchRevlogs(Repository r, String objectId, String value, final SearchType type, int offset, int maxCount) {
        final String lcValue = value.toLowerCase();
        List<RevCommit> list = new ArrayList<RevCommit>();
        try {
            if (objectId == null || objectId.trim().length() == 0) {
                objectId = Constants.HEAD;
            }
            RevWalk walk = new RevWalk(r);
            walk.setRevFilter(new RevFilter() {
 
                @Override
                public RevFilter clone() {
                    return this;
                }
 
                @Override
                public boolean include(RevWalk walker, RevCommit commit) throws StopWalkException, MissingObjectException, IncorrectObjectTypeException, IOException {
                    switch (type) {
                    case AUTHOR:
                        return (commit.getAuthorIdent().getName().toLowerCase().indexOf(lcValue) > -1) || (commit.getAuthorIdent().getEmailAddress().toLowerCase().indexOf(lcValue) > -1);
                    case COMMITTER:
                        return (commit.getCommitterIdent().getName().toLowerCase().indexOf(lcValue) > -1) || (commit.getCommitterIdent().getEmailAddress().toLowerCase().indexOf(lcValue) > -1);
                    case COMMIT:
                        return commit.getFullMessage().toLowerCase().indexOf(lcValue) > -1;
                    }
                    return false;
                }
 
            });
            ObjectId object = r.resolve(objectId);
            walk.markStart(walk.parseCommit(object));
            Iterable<RevCommit> revlog = walk;
            if (offset > 0) {
                int count = 0;
                for (RevCommit rev : revlog) {
                    count++;
                    if (count > offset) {
                        list.add(rev);
                        if (maxCount > 0 && list.size() == maxCount) {
                            break;
                        }
                    }
                }
            } else {
                for (RevCommit rev : revlog) {
                    list.add(rev);
                    if (maxCount > 0 && list.size() == maxCount) {
                        break;
                    }
                }
            }
            walk.dispose();
        } catch (Throwable t) {
            LOGGER.error("Failed to determine last change", t);
        }
        return list;
    }
 
    public static List<RefModel> getTags(Repository r, int maxCount) {
        return getRefs(r, Constants.R_TAGS, maxCount);
    }
 
    public static List<RefModel> getLocalBranches(Repository r, int maxCount) {
        return getRefs(r, Constants.R_HEADS, maxCount);
    }
 
    public static List<RefModel> getRemoteBranches(Repository r, int maxCount) {
        return getRefs(r, Constants.R_REMOTES, maxCount);
    }
 
    public static List<RefModel> getRefs(Repository r, String refs, int maxCount) {
        List<RefModel> list = new ArrayList<RefModel>();
        try {
            Map<String, Ref> map = r.getRefDatabase().getRefs(refs);
            for (String name : map.keySet()) {
                Ref ref = map.get(name);
                RevCommit commit = getCommit(r, ref.getObjectId().getName());
                list.add(new RefModel(name, ref, commit));
            }
            Collections.sort(list);
            Collections.reverse(list);
            if (maxCount > 0 && list.size() > maxCount) {
                list = new ArrayList<RefModel>(list.subList(0, maxCount));
            }
        } catch (IOException e) {
            LOGGER.error("Failed to retrieve " + refs, e);
        }
        return list;
    }
 
    public static Ref getRef(Repository r, String id) {
        try {
            Map<String, Ref> map = r.getRefDatabase().getRefs(id);
            for (String name : map.keySet()) {
                return map.get(name);
            }
        } catch (IOException e) {
            LOGGER.error("Failed to retrieve ref " + id, e);
        }
        return null;
    }
 
    public static Date getCommitDate(RevCommit commit) {
        return new Date(commit.getCommitTime() * 1000l);
    }
 
    public static String getDisplayName(PersonIdent person) {
        final StringBuilder r = new StringBuilder();
        r.append(person.getName());
        r.append(" <");
        r.append(person.getEmailAddress());
        r.append(">");
        return r.toString();
    }
 
    public static String getRepositoryDescription(Repository r) {
        File dir = r.getDirectory();
        if (dir.exists()) {
            File description = new File(dir, "description");
            if (description.exists() && description.length() > 0) {
                RandomAccessFile raf = null;
                try {
                    raf = new RandomAccessFile(description, "r");
                    byte[] buffer = new byte[(int) description.length()];
                    raf.readFully(buffer);
                    return new String(buffer);
                } catch (Throwable t) {
                } finally {
                    try {
                        raf.close();
                    } catch (Throwable t) {
                    }
                }
            }
        }
        return "";
    }
 
    public static String getRepositoryOwner(Repository r) {
        StoredConfig c = readConfig(r);
        if (c == null) {
            return "";
        }
        String o = c.getString("gitweb", null, "owner");
        return o == null ? "" : o;
    }
 
    private static StoredConfig readConfig(Repository r) {
        StoredConfig c = r.getConfig();
        if (c != null) {
            try {
                c.load();
            } catch (ConfigInvalidException cex) {
                LOGGER.error("Repository configuration is invalid!", cex);
            } catch (IOException cex) {
                LOGGER.error("Could not open repository configuration!", cex);
            }
            return c;
        }
        return null;
    }
 
    public static List<Metric> getDateMetrics(Repository r) {
        final List<RefModel> tags = getTags(r, -1);
        final Map<ObjectId, RefModel> tagMap = new HashMap<ObjectId, RefModel>();
        for (RefModel tag : tags) {
            tagMap.put(tag.getCommitId(), tag);
        }
        Metric total = new Metric("TOTAL");
        final Map<String, Metric> metricMap = new HashMap<String, Metric>();
        try {
            RevWalk walk = new RevWalk(r);
            ObjectId object = r.resolve(Constants.HEAD);
 
            RevCommit firstCommit = getFirstCommit(r, Constants.HEAD);
            RevCommit lastCommit = walk.parseCommit(object);
            int diffDays = (lastCommit.getCommitTime() - firstCommit.getCommitTime()) / (60 * 60 * 24);
            total.duration = diffDays;
            DateFormat df;
            if (diffDays <= 90) {
                // Days
                df = new SimpleDateFormat("yyyy-MM-dd");
            } else if (diffDays > 90 && diffDays < 365) {
                // Weeks
                df = new SimpleDateFormat("yyyy-MM (w)");
            } else {
                // Months
                df = new SimpleDateFormat("yyyy-MM");
            }
            walk.markStart(lastCommit);
 
            Iterable<RevCommit> revlog = walk;
            for (RevCommit rev : revlog) {
                Date d = getCommitDate(rev);
                String p = df.format(d);
                if (!metricMap.containsKey(p))
                    metricMap.put(p, new Metric(p));
                Metric m = metricMap.get(p);
                m.count++;
                total.count++;
                if (tagMap.containsKey(rev.getId())) {
                    m.tag++;
                    total.tag++;
                }
            }
        } catch (Throwable t) {
            LOGGER.error("Failed to mine log history for metrics", t);
        }
        List<String> keys = new ArrayList<String>(metricMap.keySet());
        Collections.sort(keys);
        List<Metric> metrics = new ArrayList<Metric>();
        for (String key : keys) {
            metrics.add(metricMap.get(key));
        }
        metrics.add(0, total);
        return metrics;
    }
 
    public static RefModel getTicketsBranch(Repository r) {
        RefModel ticgitBranch = null;
        try {
            // search for ticgit branch in local heads
            for (RefModel ref : getLocalBranches(r, -1)) {
                if (ref.getDisplayName().endsWith("ticgit")) {
                    ticgitBranch = ref;
                    break;
                }
            }
 
            // search for ticgit branch in remote heads
            if (ticgitBranch == null) {
                for (RefModel ref : getRemoteBranches(r, -1)) {
                    if (ref.getDisplayName().endsWith("ticgit")) {
                        ticgitBranch = ref;
                        break;
                    }
                }
            }
        } catch (Throwable t) {
            LOGGER.error("Failed to find ticgit branch!", t);
        }
        return ticgitBranch;
    }
 
    public static List<TicketModel> getTickets(Repository r) {
        RefModel ticgitBranch = getTicketsBranch(r);
        List<PathModel> paths = getFilesInPath(r, null, ticgitBranch.getCommit());
        List<TicketModel> tickets = new ArrayList<TicketModel>();
        for (PathModel ticketFolder : paths) {
            if (ticketFolder.isTree()) {
                try {
                    TicketModel t = new TicketModel(ticketFolder.name);
                    readTicketContents(r, ticgitBranch, t);
                    tickets.add(t);
                } catch (Throwable t) {
                    LOGGER.error("Failed to get a ticket!", t);
                }
            }
        }
        Collections.sort(tickets);
        Collections.reverse(tickets);
        return tickets;
    }
 
    public static TicketModel getTicket(Repository r, String ticketFolder) {
        RefModel ticketsBranch = getTicketsBranch(r);
        if (ticketsBranch != null) {
            try {
                TicketModel ticket = new TicketModel(ticketFolder);
                readTicketContents(r, ticketsBranch, ticket);
                return ticket;
            } catch (Throwable t) {
                LOGGER.error("Failed to get ticket " + ticketFolder, t);
            }
        }
        return null;
    }
 
    private static void readTicketContents(Repository r, RefModel ticketsBranch, TicketModel ticket) {
        List<PathModel> ticketFiles = getFilesInPath(r, ticket.name, ticketsBranch.getCommit());
        for (PathModel file : ticketFiles) {
            String content = getRawContentAsString(r, ticketsBranch.getCommit(), file.path).trim();
            if (file.name.equals("TICKET_ID")) {
                ticket.id = content;
            } else if (file.name.equals("TITLE")) {
                ticket.title = content;
            } else {
                String[] chunks = file.name.split("_");
                if (chunks[0].equals("ASSIGNED")) {
                    ticket.handler = content;
                } else if (chunks[0].equals("COMMENT")) {
                    try {
                        Comment c = new Comment(file.name, content);
                        ticket.comments.add(c);
                    } catch (ParseException e) {
                        e.printStackTrace();
                    }
                } else if (chunks[0].equals("TAG")) {
                    if (content.startsWith("TAG_")) {
                        ticket.tags.add(content.substring(4));
                    } else {
                        ticket.tags.add(content);
                    }
                } else if (chunks[0].equals("STATE")) {
                    ticket.state = content;
                }
            }
        }
        Collections.sort(ticket.comments);
    }
 
    public static String getTicketContent(Repository r, String filePath) {
        RefModel ticketsBranch = getTicketsBranch(r);
        if (ticketsBranch != null) {
            return getRawContentAsString(r, ticketsBranch.getCommit(), filePath);
        }
        return "";
    }
}