Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgBookmarks.java @ 606:5daa42067e7c

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Avoid mmap files when only few bytes are to be read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 14:16:35 +0200
parents c56edf42be64
children 5c68567b3645
rev   line source
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1 /*
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2 * Copyright (c) 2012-2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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18
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19 import static org.tmatesoft.hg.util.LogFacility.Severity.Error;
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20
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21 import java.io.File;
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22 import java.io.FileWriter;
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23 import java.io.IOException;
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24 import java.util.ArrayList;
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25 import java.util.Collection;
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26 import java.util.Collections;
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27 import java.util.LinkedHashMap;
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28 import java.util.Map;
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29
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30 import org.tmatesoft.hg.core.HgIOException;
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31 import org.tmatesoft.hg.core.HgRepositoryLockException;
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32 import org.tmatesoft.hg.core.Nodeid;
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33 import org.tmatesoft.hg.internal.Experimental;
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34 import org.tmatesoft.hg.internal.Internals;
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35 import org.tmatesoft.hg.internal.LineReader;
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36 import org.tmatesoft.hg.util.LogFacility;
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37
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38 /**
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39 *
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40 * @see http://mercurial.selenic.com/wiki/Bookmarks
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41 * @author Artem Tikhomirov
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42 * @author TMate Software Ltd.
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43 */
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44 public final class HgBookmarks {
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45 private final Internals internalRepo;
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46 private Map<String, Nodeid> bookmarks = Collections.emptyMap();
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47 private String activeBookmark;
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48
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49 HgBookmarks(Internals internals) {
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50 internalRepo = internals;
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51 }
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52
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53 /*package-local*/ void read() throws HgInvalidControlFileException {
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54 final LogFacility log = internalRepo.getSessionContext().getLog();
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55 final HgRepository repo = internalRepo.getRepo();
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56 File all = internalRepo.getFileFromRepoDir(HgRepositoryFiles.Bookmarks.getName());
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57 LinkedHashMap<String, Nodeid> bm = new LinkedHashMap<String, Nodeid>();
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58 if (all.canRead()) {
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59 LineReader lr1 = new LineReader(all, log);
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60 ArrayList<String> c = new ArrayList<String>();
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61 lr1.read(new LineReader.SimpleLineCollector(), c);
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62 for (String s : c) {
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63 int x = s.indexOf(' ');
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64 try {
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65 if (x > 0) {
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66 Nodeid nid = Nodeid.fromAscii(s.substring(0, x));
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67 String name = new String(s.substring(x+1));
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68 if (repo.getChangelog().isKnown(nid)) {
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69 // copy name part not to drag complete line
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70 bm.put(name, nid);
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71 } else {
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72 log.dump(getClass(), LogFacility.Severity.Info, "Bookmark %s points to non-existent revision %s, ignored.", name, nid);
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73 }
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74 } else {
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75 log.dump(getClass(), LogFacility.Severity.Warn, "Can't parse bookmark entry: %s", s);
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76 }
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77 } catch (IllegalArgumentException ex) {
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78 log.dump(getClass(), LogFacility.Severity.Warn, ex, String.format("Can't parse bookmark entry: %s", s));
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79 }
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80 }
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81 bookmarks = bm;
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82 } else {
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83 bookmarks = Collections.emptyMap();
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84 }
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85
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86 activeBookmark = null;
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87 File active = internalRepo.getFileFromRepoDir(HgRepositoryFiles.BookmarksCurrent.getName());
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88 if (active.canRead()) {
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89 LineReader lr2 = new LineReader(active, log);
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90 ArrayList<String> c = new ArrayList<String>(2);
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91 lr2.read(new LineReader.SimpleLineCollector(), c);
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92 if (c.size() > 0) {
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93 activeBookmark = c.get(0);
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94 }
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95 }
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96 }
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97
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98 /**
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99 * Tell name of the active bookmark
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100 * @return <code>null</code> if none active
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101 */
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102 public String getActiveBookmarkName() {
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103 return activeBookmark;
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104 }
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105
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106 /**
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107 * Retrieve revision associated with the named bookmark.
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108 *
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109 * @param bookmarkName name of the bookmark
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110 * @return revision or <code>null</code> if bookmark is not known
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111 */
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112 public Nodeid getRevision(String bookmarkName) {
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113 return bookmarks.get(bookmarkName);
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114 }
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115
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116 /**
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117 * Retrieve all bookmarks known in the repository
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118 * @return collection with names, never <code>null</code>
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119 */
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120 public Collection<String> getAllBookmarks() {
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121 // bookmarks are initialized with atomic assignment,
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122 // hence can use view (not a synchronized copy) here
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123 return Collections.unmodifiableSet(bookmarks.keySet());
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124 }
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125
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126 /**
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127 * Update currently bookmark with new commit.
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128 * Note, child has to be descendant of a p1 or p2
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129 *
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130 * @param p1 first parent, or <code>null</code>
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131 * @param p2 second parent, or <code>null</code>
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132 * @param child new commit, descendant of one of the parents, not <code>null</code>
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133 * @throws HgIOException if failed to write updated bookmark information
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134 * @throws HgRepositoryLockException if failed to lock repository for modifications
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135 */
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136 @Experimental(reason="Provisional API")
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137 public void updateActive(Nodeid p1, Nodeid p2, Nodeid child) throws HgIOException, HgRepositoryLockException {
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138 if (activeBookmark == null) {
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139 return;
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140 }
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141 Nodeid activeRev = getRevision(activeBookmark);
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142 if (!activeRev.equals(p1) && !activeRev.equals(p2)) {
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143 // from the wiki:
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144 // "active bookmarks are automatically updated when committing to the changeset they are pointing to"
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145 // FIXME: test ci 1, hg bookmark active, ci 2, hg bookmark -f -r 0 active, ci 3, check active still points to r0
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146 return;
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147 }
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148 if (child.equals(activeRev)) {
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149 return;
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150 }
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151 LinkedHashMap<String, Nodeid> copy = new LinkedHashMap<String, Nodeid>(bookmarks);
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152 copy.put(activeBookmark, child);
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153 bookmarks = copy;
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154 write();
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155 }
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156
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157 private void write() throws HgIOException, HgRepositoryLockException {
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158 File bookmarksFile = internalRepo.getRepositoryFile(HgRepositoryFiles.Bookmarks);
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159 HgRepositoryLock workingDirLock = internalRepo.getRepo().getWorkingDirLock();
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160 FileWriter fileWriter = null;
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161 workingDirLock.acquire();
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162 try {
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163 fileWriter = new FileWriter(bookmarksFile);
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164 for (String bm : bookmarks.keySet()) {
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165 Nodeid nid = bookmarks.get(bm);
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166 fileWriter.write(String.format("%s %s\n", nid.toString(), bm));
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167 }
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168 fileWriter.flush();
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169 } catch (IOException ex) {
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170 throw new HgIOException("Failed to serialize bookmarks", ex, bookmarksFile);
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171 } finally {
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172 try {
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173 if (fileWriter != null) {
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174 fileWriter.close();
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175 }
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176 } catch (IOException ex) {
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177 internalRepo.getSessionContext().getLog().dump(getClass(), Error, ex, null);
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178 }
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179 workingDirLock.release();
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180 }
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181 }
484
ae4d6604debd Bookmarks support added
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182 }