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annotate src/org/tmatesoft/hg/internal/Internals.java @ 491:4a670f76e7d1

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Javadoc for HgRepository#getLocation()
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Oct 2012 21:07:27 +0200
parents b3c16d1aede0
children ba36f66c32b4
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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.internal;
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18
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19 import static org.tmatesoft.hg.internal.RequiresFile.*;
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20 import static org.tmatesoft.hg.util.LogFacility.Severity.Error;
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21
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22 import java.io.File;
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23 import java.io.IOException;
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24 import java.nio.charset.Charset;
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25 import java.util.ArrayList;
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26 import java.util.Arrays;
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27 import java.util.Collections;
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28 import java.util.Iterator;
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29 import java.util.LinkedHashSet;
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30 import java.util.List;
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31 import java.util.StringTokenizer;
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32
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33 import org.tmatesoft.hg.core.SessionContext;
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34 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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35 import org.tmatesoft.hg.repo.HgRepoConfig.ExtensionsSection;
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36 import org.tmatesoft.hg.repo.HgRepository;
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37 import org.tmatesoft.hg.util.PathRewrite;
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39 /**
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40 * Fields/members that shall not be visible
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41 *
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42 * @author Artem Tikhomirov
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43 * @author TMate Software Ltd.
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44 */
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45 public final class Internals {
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46
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47 /**
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48 * Allows to specify Mercurial installation directory to detect installation-wide configurations.
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49 * Without this property set, hg4j would attempt to deduce this value locating hg executable.
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50 */
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51 public static final String CFG_PROPERTY_HG_INSTALL_ROOT = "hg4j.hg.install_root";
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53 /**
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54 * Tells repository not to cache files/revlogs
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55 * XXX perhaps, need to respect this property not only for data files, but for manifest and changelog as well?
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56 * (@see HgRepository#getChangelog and #getManifest())
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57 */
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58 public static final String CFG_PROPERTY_REVLOG_STREAM_CACHE = "hg4j.repo.disable_revlog_cache";
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59
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60 /**
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61 * Name of charset to use when translating Unicode filenames to Mercurial storage paths, string,
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62 * to resolve with {@link Charset#forName(String)}.
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63 * E.g. <code>"cp1251"</code> or <code>"Latin-1"</code>.
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64 *
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65 * <p>Mercurial uses system encoding when mangling storage paths. Default value
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66 * based on 'file.encoding' Java system property is usually fine here, however
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67 * in certain scenarios it may be desirable to force a different one, and this
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68 * property is exactly for this purpose.
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69 *
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70 * <p>E.g. Eclipse defaults to project encoding (Launch config, Common page) when launching an application,
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71 * and if your project happen to use anything but filesystem default (say, UTF8 on cp1251 system),
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72 * native storage paths won't match
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73 */
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74 public static final String CFG_PROPERTY_FS_FILENAME_ENCODING = "hg.fs.filename.encoding";
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76 private int requiresFlags = 0;
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77 private List<Filter.Factory> filterFactories;
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78 private final HgRepository repo;
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79 private final File repoDir;
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80 private final boolean isCaseSensitiveFileSystem;
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81 private final boolean shallCacheRevlogsInRepo;
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82 private final DataAccessProvider dataAccess;
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83
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84 public Internals(HgRepository hgRepo, File hgDir) {
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85 repo = hgRepo;
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86 repoDir = hgDir;
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87 isCaseSensitiveFileSystem = !runningOnWindows();
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88 SessionContext ctx = repo.getSessionContext();
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89 shallCacheRevlogsInRepo = new PropertyMarshal(ctx).getBoolean(CFG_PROPERTY_REVLOG_STREAM_CACHE, true);
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90 dataAccess = new DataAccessProvider(ctx);
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91 }
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93 public boolean isInvalid() {
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94 return !repoDir.exists() || !repoDir.isDirectory();
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95 }
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97 public File getFileFromRepoDir(String name) {
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98 return new File(repoDir, name);
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99 }
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101 public SessionContext getContext() {
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102 return repo.getSessionContext();
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103 }
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104
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105 public HgRepository getRepo() {
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106 return repo;
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107 }
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108
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109 public DataAccessProvider getDataAccess() {
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110 return dataAccess;
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111 }
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112
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113 public void parseRequires() throws HgInvalidControlFileException {
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114 File requiresFile =getFileFromRepoDir("requires");
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115 try {
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116 new RequiresFile().parse(this, requiresFile);
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117 } catch (IOException ex) {
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118 throw new HgInvalidControlFileException("Parse failed", ex, requiresFile);
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119 }
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120 }
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121
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122 public/*for tests, otherwise pkg*/ void setStorageConfig(int version, int flags) {
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123 requiresFlags = flags;
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124 }
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125
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126 public PathRewrite buildNormalizePathRewrite() {
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127 if (runningOnWindows()) {
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128 return new WinToNixPathRewrite();
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129 } else {
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130 return new PathRewrite.Empty(); // or strip leading slash, perhaps?
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131 }
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132 }
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133
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134 // XXX perhaps, should keep both fields right here, not in the HgRepository
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135 public PathRewrite buildDataFilesHelper() {
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136 return new RepoInitializer().setRequires(requiresFlags).buildDataFilesHelper(getContext());
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137 }
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138
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139 public PathRewrite buildRepositoryFilesHelper() {
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140 if ((requiresFlags & STORE) != 0) {
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141 return new PathRewrite() {
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142 public CharSequence rewrite(CharSequence path) {
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143 return "store/" + path;
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144 }
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145 };
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146 } else {
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147 return new PathRewrite.Empty();
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148 }
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149 }
114
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150
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151 public List<Filter.Factory> getFilters() {
114
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152 if (filterFactories == null) {
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153 filterFactories = new ArrayList<Filter.Factory>();
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154 ExtensionsSection cfg = repo.getConfiguration().getExtensions();
331
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155 if (cfg.isEnabled("eol")) {
114
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156 NewlineFilter.Factory ff = new NewlineFilter.Factory();
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157 ff.initialize(repo);
114
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158 filterFactories.add(ff);
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159 }
331
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160 if (cfg.isEnabled("keyword")) {
114
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161 KeywordFilter.Factory ff = new KeywordFilter.Factory();
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162 ff.initialize(repo);
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163 filterFactories.add(ff);
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164 }
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165 }
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166 return filterFactories;
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167 }
202
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168
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169 public boolean isCaseSensitiveFileSystem() {
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170 return isCaseSensitiveFileSystem;
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171 }
412
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172
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173 public EncodingHelper buildFileNameEncodingHelper() {
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174 SessionContext ctx = repo.getSessionContext();
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175 return new EncodingHelper(getFileEncoding(ctx), ctx);
412
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176 }
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177
490
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178 /*package-local*/ static Charset getFileEncoding(SessionContext ctx) {
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179 Object altEncoding = ctx.getConfigurationProperty(CFG_PROPERTY_FS_FILENAME_ENCODING, null);
412
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180 Charset cs;
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181 if (altEncoding == null) {
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182 cs = Charset.defaultCharset();
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183 } else {
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184 try {
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185 cs = Charset.forName(altEncoding.toString());
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186 } catch (IllegalArgumentException ex) {
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187 // both IllegalCharsetNameException and UnsupportedCharsetException are subclasses of IAE, too
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188 // not severe enough to throw an exception, imo. Just record the fact it's bad ad we ignore it
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189 ctx.getLog().dump(Internals.class, Error, ex, String.format("Bad configuration value for filename encoding %s", altEncoding));
412
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190 cs = Charset.defaultCharset();
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191 }
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192 }
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193 return cs;
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194 }
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195
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196 public static boolean runningOnWindows() {
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197 return System.getProperty("os.name").indexOf("Windows") != -1;
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198 }
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199
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200 /**
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201 * @param fsHint optional hint pointing to filesystem of interest (generally, it's possible to mount
413
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202 * filesystems with different capabilities and repository's capabilities would depend on which fs it resides)
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203 * @return <code>true</code> if executable files deserve tailored handling
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204 */
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205 public static boolean checkSupportsExecutables(File fsHint) {
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206 // *.exe are not executables for Mercurial
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207 return !runningOnWindows();
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208 }
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209
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210 /**
419
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211 * @param fsHint optional hint pointing to filesystem of interest (generally, it's possible to mount
413
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212 * filesystems with different capabilities and repository's capabilities would depend on which fs it resides)
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213 * @return <code>true</code> if filesystem knows what symbolic links are
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214 */
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215 public static boolean checkSupportsSymlinks(File fsHint) {
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216 // Windows supports soft symbolic links starting from Vista
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217 // However, as of Mercurial 2.1.1, no support for this functionality
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218 // XXX perhaps, makes sense to override with a property a) to speed up when no links are in use b) investigate how this runs windows
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219 return !runningOnWindows();
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220 }
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221
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222
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223 /**
379
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224 * For Unix, returns installation root, which is the parent directory of the hg executable (or symlink) being run.
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225 * For Windows, it's Mercurial installation directory itself
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226 * @param ctx
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227 */
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228 private static File findHgInstallRoot(SessionContext ctx) {
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229 // let clients to override Hg install location
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230 String p = (String) ctx.getConfigurationProperty(CFG_PROPERTY_HG_INSTALL_ROOT, null);
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231 if (p != null) {
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232 return new File(p);
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233 }
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234 StringTokenizer st = new StringTokenizer(System.getenv("PATH"), System.getProperty("path.separator"), false);
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235 final boolean runsOnWin = runningOnWindows();
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236 while (st.hasMoreTokens()) {
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237 String pe = st.nextToken();
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238 File execCandidate = new File(pe, runsOnWin ? "hg.exe" : "hg");
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239 if (execCandidate.exists() && execCandidate.isFile()) {
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240 File execDir = execCandidate.getParentFile();
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241 // e.g. on Unix runs "/shared/tools/bin/hg", directory of interest is "/shared/tools/"
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242 return runsOnWin ? execDir : execDir.getParentFile();
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243 }
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244 }
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245 return null;
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246 }
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247
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248 /**
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249 * @see http://www.selenic.com/mercurial/hgrc.5.html
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250 */
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251 public ConfigFile readConfiguration() throws IOException {
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252 SessionContext sessionCtx = repo.getSessionContext();
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253 ConfigFile configFile = new ConfigFile(sessionCtx);
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254 File hgInstallRoot = findHgInstallRoot(sessionCtx); // may be null
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255 //
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256 if (runningOnWindows()) {
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257 if (hgInstallRoot != null) {
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258 for (File f : getWindowsConfigFilesPerInstall(hgInstallRoot)) {
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259 configFile.addLocation(f);
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260 }
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261 }
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262 LinkedHashSet<String> locations = new LinkedHashSet<String>();
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263 locations.add(System.getenv("USERPROFILE"));
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264 locations.add(System.getenv("HOME"));
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265 locations.remove(null);
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266 for (String loc : locations) {
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267 File location = new File(loc);
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268 configFile.addLocation(new File(location, "Mercurial.ini"));
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269 configFile.addLocation(new File(location, ".hgrc"));
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270 }
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271 } else {
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272 if (hgInstallRoot != null) {
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273 File d = new File(hgInstallRoot, "etc/mercurial/hgrc.d/");
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274 if (d.isDirectory() && d.canRead()) {
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275 for (File f : listConfigFiles(d)) {
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276 configFile.addLocation(f);
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277 }
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278 }
379
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279 configFile.addLocation(new File(hgInstallRoot, "etc/mercurial/hgrc"));
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280 }
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281 // same, but with absolute paths
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282 File d = new File("/etc/mercurial/hgrc.d/");
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283 if (d.isDirectory() && d.canRead()) {
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284 for (File f : listConfigFiles(d)) {
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285 configFile.addLocation(f);
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286 }
351
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287 }
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288 configFile.addLocation(new File("/etc/mercurial/hgrc"));
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289 configFile.addLocation(new File(System.getenv("HOME"), ".hgrc"));
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290 }
331
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291 // last one, overrides anything else
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292 // <repo>/.hg/hgrc
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293 configFile.addLocation(getFileFromRepoDir("hgrc"));
331
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294 return configFile;
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295 }
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296
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297 private static List<File> getWindowsConfigFilesPerInstall(File hgInstallDir) {
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298 File f = new File(hgInstallDir, "Mercurial.ini");
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299 if (f.exists()) {
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300 return Collections.singletonList(f);
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301 }
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302 f = new File(hgInstallDir, "hgrc.d/");
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303 if (f.canRead() && f.isDirectory()) {
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304 return listConfigFiles(f);
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305 }
418
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306 // TODO post-1.0 query registry, e.g. with
379
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307 // Runtime.exec("reg query HKLM\Software\Mercurial")
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308 //
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309 f = new File("C:\\Mercurial\\Mercurial.ini");
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310 if (f.exists()) {
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311 return Collections.singletonList(f);
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312 }
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313 return Collections.emptyList();
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314 }
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315
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316 private static List<File> listConfigFiles(File dir) {
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317 assert dir.canRead();
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318 assert dir.isDirectory();
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319 final File[] allFiles = dir.listFiles();
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320 // File is Comparable, lexicographically by default
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321 Arrays.sort(allFiles);
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322 ArrayList<File> rv = new ArrayList<File>(allFiles.length);
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323 for (File f : allFiles) {
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324 if (f.getName().endsWith(".rc")) {
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325 rv.add(f);
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326 }
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327 }
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328 return rv;
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329 }
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330
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331 public static File getInstallationConfigurationFileToWrite(SessionContext ctx) {
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332 File hgInstallRoot = findHgInstallRoot(ctx); // may be null
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333 // choice of which hgrc to pick here is according to my own pure discretion
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334 if (hgInstallRoot != null) {
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335 // use this location only if it's writable
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336 File cfg = new File(hgInstallRoot, runningOnWindows() ? "Mercurial.ini" : "etc/mercurial/hgrc");
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337 if (cfg.canWrite() || cfg.getParentFile().canWrite()) {
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338 return cfg;
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339 }
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340 }
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341 // fallback
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342 if (runningOnWindows()) {
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343 if (hgInstallRoot == null) {
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344 return new File("C:\\Mercurial\\Mercurial.ini");
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345 } else {
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346 // yes, we tried this file already (above) and found it non-writable
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347 // let caller fail with can't write
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348 return new File(hgInstallRoot, "Mercurial.ini");
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349 }
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350 } else {
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351 return new File("/etc/mercurial/hgrc");
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352 }
378
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353 }
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354
382
82336b7c54f4 Per-repository UpdateConfigCommand completed. Access to system properties through SessionContext to ease alternation
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355 public static File getUserConfigurationFileToWrite(SessionContext ctx) {
379
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356 LinkedHashSet<String> locations = new LinkedHashSet<String>();
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357 final boolean runsOnWindows = runningOnWindows();
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358 if (runsOnWindows) {
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359 locations.add(System.getenv("USERPROFILE"));
378
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360 }
379
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361 locations.add(System.getenv("HOME"));
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362 locations.remove(null);
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363 for (String loc : locations) {
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364 File location = new File(loc);
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365 File rv = new File(location, ".hgrc");
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366 if (rv.exists() && rv.canWrite()) {
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367 return rv;
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368 }
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369 if (runsOnWindows) {
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370 rv = new File(location, "Mercurial.ini");
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371 if (rv.exists() && rv.canWrite()) {
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372 return rv;
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373 }
378
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374 }
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375 }
379
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376 // fallback to default, let calling code fail with Exception if can't write
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377 return new File(System.getProperty("user.home"), ".hgrc");
378
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378 }
388
b015f3918120 Work on FIXME: correct HgDataFile#workingCopy with tests; BasicSessionContext with property override; platform-specific options to internals
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379
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380 public boolean shallCacheRevlogs() {
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381 return shallCacheRevlogsInRepo;
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382 }
407
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383
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384 public static <T> CharSequence join(Iterable<T> col, CharSequence separator) {
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385 if (col == null) {
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386 return String.valueOf(col);
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387 }
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388 Iterator<T> it = col.iterator();
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389 if (!it.hasNext()) {
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390 return "[]";
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391 }
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392 String v = String.valueOf(it.next());
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393 StringBuilder sb = new StringBuilder(v);
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394 while (it.hasNext()) {
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395 sb.append(separator);
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diff changeset
396 v = String.valueOf(it.next());
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397 sb.append(v);
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398 }
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399 return sb;
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400 }
420
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 419
diff changeset
401
6c22bdc0bdfd Respect long offsets in revlogs
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402 /**
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403 * keep an eye on all long to int downcasts to get a chance notice the lost of data
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diff changeset
404 * Use if there's even subtle chance there might be loss
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diff changeset
405 * (ok not to use if there's no way for l to be greater than int)
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diff changeset
406 */
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parents: 419
diff changeset
407 public static int ltoi(long l) {
6c22bdc0bdfd Respect long offsets in revlogs
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diff changeset
408 int i = (int) l;
6c22bdc0bdfd Respect long offsets in revlogs
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diff changeset
409 assert ((long) i) == l : "Loss of data!";
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 419
diff changeset
410 return i;
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 419
diff changeset
411 }
74
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
412 }