Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/Internals.java @ 434:7e1912b4ce99 v0.9.0

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Record few known issues while skimming through TODOs
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 30 Mar 2012 17:11:39 +0200
parents 48f993aa2f41
children 909306e412e2
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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19 import static org.tmatesoft.hg.internal.RequiresFile.*;
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20
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21 import java.io.File;
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22 import java.io.FileOutputStream;
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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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33 import org.tmatesoft.hg.core.SessionContext;
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34 import org.tmatesoft.hg.repo.HgInternals;
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35 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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36 import org.tmatesoft.hg.repo.HgRepoConfig.ExtensionsSection;
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37 import org.tmatesoft.hg.repo.HgRepository;
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38 import org.tmatesoft.hg.util.PathRewrite;
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40 /**
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41 * Fields/members that shall not be visible
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public final class Internals {
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47
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48 /**
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49 * Allows to specify Mercurial installation directory to detect installation-wide configurations.
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50 * Without this property set, hg4j would attempt to deduce this value locating hg executable.
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51 */
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52 public static final String CFG_PROPERTY_HG_INSTALL_ROOT = "hg4j.hg.install_root";
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54 /**
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55 * Tells repository not to cache files/revlogs
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56 * XXX perhaps, need to respect this property not only for data files, but for manifest and changelog as well?
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57 * (@see HgRepository#getChangelog and #getManifest())
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58 */
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59 public static final String CFG_PROPERTY_REVLOG_STREAM_CACHE = "hg4j.repo.disable_revlog_cache";
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60
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61 /**
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62 * Name of charset to use when translating Unicode filenames to Mercurial storage paths, string,
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63 * to resolve with {@link Charset#forName(String)}.
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64 * E.g. <code>"cp1251"</code> or <code>"Latin-1"</code>.
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65 *
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66 * <p>Mercurial uses system encoding when mangling storage paths. Default value
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67 * based on 'file.encoding' Java system property is usually fine here, however
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68 * in certain scenarios it may be desirable to force a different one, and this
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69 * property is exactly for this purpose.
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70 *
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71 * <p>E.g. Eclipse defaults to project encoding (Launch config, Common page) when launching an application,
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72 * and if your project happen to use anything but filesystem default (say, UTF8 on cp1251 system),
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73 * native storage paths won't match
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74 */
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75 public static final String CFG_PROPERTY_FS_FILENAME_ENCODING = "hg.fs.filename.encoding";
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77 private int requiresFlags = 0;
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78 private List<Filter.Factory> filterFactories;
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79 private final SessionContext sessionContext;
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80 private final boolean isCaseSensitiveFileSystem;
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81 private final boolean shallCacheRevlogsInRepo;
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82
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83 public Internals(SessionContext ctx) {
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84 sessionContext = ctx;
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85 isCaseSensitiveFileSystem = !runningOnWindows();
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86 Object p = ctx.getProperty(CFG_PROPERTY_REVLOG_STREAM_CACHE, true);
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87 shallCacheRevlogsInRepo = p instanceof Boolean ? ((Boolean) p).booleanValue() : Boolean.parseBoolean(String.valueOf(p));
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88 }
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89
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90 public void parseRequires(HgRepository hgRepo, File requiresFile) throws HgInvalidControlFileException {
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91 try {
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92 new RequiresFile().parse(this, requiresFile);
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93 } catch (IOException ex) {
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94 throw new HgInvalidControlFileException("Parse failed", ex, requiresFile);
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95 }
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96 }
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98 public/*for tests, otherwise pkg*/ void setStorageConfig(int version, int flags) {
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99 requiresFlags = flags;
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100 }
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102 public PathRewrite buildNormalizePathRewrite() {
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103 if (runningOnWindows()) {
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104 return new WinToNixPathRewrite();
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105 } else {
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106 return new PathRewrite.Empty(); // or strip leading slash, perhaps?
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107 }
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108 }
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110 // XXX perhaps, should keep both fields right here, not in the HgRepository
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111 public PathRewrite buildDataFilesHelper() {
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112 // Note, tests in TestStorePath depend on the encoding not being cached
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113 Charset cs = getFileEncoding();
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114 // StoragePathHelper needs fine-grained control over char encoding, hence doesn't use EncodingHelper
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115 return new StoragePathHelper((requiresFlags & STORE) != 0, (requiresFlags & FNCACHE) != 0, (requiresFlags & DOTENCODE) != 0, cs);
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116 }
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117
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118 public PathRewrite buildRepositoryFilesHelper() {
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119 if ((requiresFlags & STORE) != 0) {
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120 return new PathRewrite() {
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121 public CharSequence rewrite(CharSequence path) {
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122 return "store/" + path;
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123 }
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124 };
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125 } else {
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126 return new PathRewrite.Empty();
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127 }
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128 }
114
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129
331
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130 public List<Filter.Factory> getFilters(HgRepository hgRepo) {
114
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131 if (filterFactories == null) {
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132 filterFactories = new ArrayList<Filter.Factory>();
331
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133 ExtensionsSection cfg = hgRepo.getConfiguration().getExtensions();
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134 if (cfg.isEnabled("eol")) {
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135 NewlineFilter.Factory ff = new NewlineFilter.Factory();
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136 ff.initialize(hgRepo);
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137 filterFactories.add(ff);
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138 }
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139 if (cfg.isEnabled("keyword")) {
114
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140 KeywordFilter.Factory ff = new KeywordFilter.Factory();
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141 ff.initialize(hgRepo);
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142 filterFactories.add(ff);
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143 }
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144 }
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145 return filterFactories;
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146 }
202
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147
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148 public void initEmptyRepository(File hgDir) throws IOException {
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149 hgDir.mkdir();
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150 FileOutputStream requiresFile = new FileOutputStream(new File(hgDir, "requires"));
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151 StringBuilder sb = new StringBuilder(40);
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152 sb.append("revlogv1\n");
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153 if ((requiresFlags & STORE) != 0) {
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154 sb.append("store\n");
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155 }
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156 if ((requiresFlags & FNCACHE) != 0) {
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157 sb.append("fncache\n");
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158 }
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159 if ((requiresFlags & DOTENCODE) != 0) {
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160 sb.append("dotencode\n");
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161 }
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162 requiresFile.write(sb.toString().getBytes());
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163 requiresFile.close();
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164 new File(hgDir, "store").mkdir(); // with that, hg verify says ok.
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165 }
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166
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167 public boolean isCaseSensitiveFileSystem() {
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168 return isCaseSensitiveFileSystem;
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169 }
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170
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171 public EncodingHelper buildFileNameEncodingHelper() {
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172 return new EncodingHelper(getFileEncoding(), sessionContext);
412
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173 }
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174
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175 private Charset getFileEncoding() {
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176 Object altEncoding = sessionContext.getProperty(CFG_PROPERTY_FS_FILENAME_ENCODING, null);
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177 Charset cs;
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178 if (altEncoding == null) {
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179 cs = Charset.defaultCharset();
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180 } else {
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181 try {
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182 cs = Charset.forName(altEncoding.toString());
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183 } catch (IllegalArgumentException ex) {
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184 // both IllegalCharsetNameException and UnsupportedCharsetException are subclasses of IAE, too
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185 // not severe enough to throw an exception, imo. Just record the fact it's bad ad we ignore it
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186 sessionContext.getLog().error(Internals.class, ex, String.format("Bad configuration value for filename encoding %s", altEncoding));
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187 cs = Charset.defaultCharset();
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188 }
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189 }
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190 return cs;
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191 }
202
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192
292
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193 public static boolean runningOnWindows() {
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194 return System.getProperty("os.name").indexOf("Windows") != -1;
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195 }
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196
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197 /**
419
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198 * @param fsHint optional hint pointing to filesystem of interest (generally, it's possible to mount
413
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199 * filesystems with different capabilities and repository's capabilities would depend on which fs it resides)
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200 * @return <code>true</code> if executable files deserve tailored handling
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201 */
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202 public static boolean checkSupportsExecutables(File fsHint) {
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203 // *.exe are not executables for Mercurial
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204 return !runningOnWindows();
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205 }
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206
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207 /**
419
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208 * @param fsHint optional hint pointing to filesystem of interest (generally, it's possible to mount
413
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209 * filesystems with different capabilities and repository's capabilities would depend on which fs it resides)
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210 * @return <code>true</code> if filesystem knows what symbolic links are
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211 */
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212 public static boolean checkSupportsSymlinks(File fsHint) {
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213 // Windows supports soft symbolic links starting from Vista
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214 // However, as of Mercurial 2.1.1, no support for this functionality
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215 // 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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216 return !runningOnWindows();
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217 }
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218
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219
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220 /**
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221 * For Unix, returns installation root, which is the parent directory of the hg executable (or symlink) being run.
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222 * For Windows, it's Mercurial installation directory itself
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223 * @param ctx
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224 */
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225 private static File findHgInstallRoot(SessionContext ctx) {
379
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226 // let clients to override Hg install location
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227 String p = (String) ctx.getProperty(CFG_PROPERTY_HG_INSTALL_ROOT, null);
379
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228 if (p != null) {
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229 return new File(p);
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230 }
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231 StringTokenizer st = new StringTokenizer(System.getenv("PATH"), System.getProperty("path.separator"), false);
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232 final boolean runsOnWin = runningOnWindows();
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233 while (st.hasMoreTokens()) {
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234 String pe = st.nextToken();
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235 File execCandidate = new File(pe, runsOnWin ? "hg.exe" : "hg");
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236 if (execCandidate.exists() && execCandidate.isFile()) {
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237 File execDir = execCandidate.getParentFile();
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238 // e.g. on Unix runs "/shared/tools/bin/hg", directory of interest is "/shared/tools/"
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239 return runsOnWin ? execDir : execDir.getParentFile();
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240 }
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241 }
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242 return null;
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243 }
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244
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245 /**
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246 * @see http://www.selenic.com/mercurial/hgrc.5.html
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247 */
331
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248 public ConfigFile readConfiguration(HgRepository hgRepo, File repoRoot) throws IOException {
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249 ConfigFile configFile = new ConfigFile();
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250 File hgInstallRoot = findHgInstallRoot(HgInternals.getContext(hgRepo)); // may be null
379
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251 //
351
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252 if (runningOnWindows()) {
379
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253 if (hgInstallRoot != null) {
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254 for (File f : getWindowsConfigFilesPerInstall(hgInstallRoot)) {
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255 configFile.addLocation(f);
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256 }
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257 }
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258 LinkedHashSet<String> locations = new LinkedHashSet<String>();
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259 locations.add(System.getenv("USERPROFILE"));
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260 locations.add(System.getenv("HOME"));
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261 locations.remove(null);
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262 for (String loc : locations) {
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263 File location = new File(loc);
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264 configFile.addLocation(new File(location, "Mercurial.ini"));
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265 configFile.addLocation(new File(location, ".hgrc"));
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266 }
351
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267 } else {
379
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268 if (hgInstallRoot != null) {
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269 File d = new File(hgInstallRoot, "etc/mercurial/hgrc.d/");
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270 if (d.isDirectory() && d.canRead()) {
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271 for (File f : listConfigFiles(d)) {
351
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272 configFile.addLocation(f);
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273 }
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274 }
379
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275 configFile.addLocation(new File(hgInstallRoot, "etc/mercurial/hgrc"));
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276 }
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277 // same, but with absolute paths
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278 File d = new File("/etc/mercurial/hgrc.d/");
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279 if (d.isDirectory() && d.canRead()) {
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280 for (File f : listConfigFiles(d)) {
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281 configFile.addLocation(f);
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282 }
351
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283 }
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284 configFile.addLocation(new File("/etc/mercurial/hgrc"));
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285 configFile.addLocation(new File(System.getenv("HOME"), ".hgrc"));
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286 }
331
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287 // last one, overrides anything else
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288 // <repo>/.hg/hgrc
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289 configFile.addLocation(new File(repoRoot, "hgrc"));
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290 return configFile;
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291 }
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292
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293 private static List<File> getWindowsConfigFilesPerInstall(File hgInstallDir) {
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294 File f = new File(hgInstallDir, "Mercurial.ini");
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295 if (f.exists()) {
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296 return Collections.singletonList(f);
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297 }
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298 f = new File(hgInstallDir, "hgrc.d/");
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299 if (f.canRead() && f.isDirectory()) {
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300 return listConfigFiles(f);
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301 }
418
528b6780a8bd A bit of FIXME cleanup (mostly degraded to TODO post 1.0), comments and javadoc
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302 // TODO post-1.0 query registry, e.g. with
379
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303 // Runtime.exec("reg query HKLM\Software\Mercurial")
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304 //
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305 f = new File("C:\\Mercurial\\Mercurial.ini");
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306 if (f.exists()) {
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307 return Collections.singletonList(f);
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308 }
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309 return Collections.emptyList();
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310 }
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311
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312 private static List<File> listConfigFiles(File dir) {
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313 assert dir.canRead();
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314 assert dir.isDirectory();
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315 final File[] allFiles = dir.listFiles();
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316 // File is Comparable, lexicographically by default
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317 Arrays.sort(allFiles);
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318 ArrayList<File> rv = new ArrayList<File>(allFiles.length);
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319 for (File f : allFiles) {
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320 if (f.getName().endsWith(".rc")) {
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321 rv.add(f);
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322 }
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323 }
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324 return rv;
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325 }
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326
382
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327 public static File getInstallationConfigurationFileToWrite(SessionContext ctx) {
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328 File hgInstallRoot = findHgInstallRoot(ctx); // may be null
379
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329 // choice of which hgrc to pick here is according to my own pure discretion
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330 if (hgInstallRoot != null) {
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331 // use this location only if it's writable
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332 File cfg = new File(hgInstallRoot, runningOnWindows() ? "Mercurial.ini" : "etc/mercurial/hgrc");
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333 if (cfg.canWrite() || cfg.getParentFile().canWrite()) {
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334 return cfg;
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335 }
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336 }
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337 // fallback
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338 if (runningOnWindows()) {
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339 if (hgInstallRoot == null) {
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340 return new File("C:\\Mercurial\\Mercurial.ini");
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341 } else {
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342 // yes, we tried this file already (above) and found it non-writable
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343 // let caller fail with can't write
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344 return new File(hgInstallRoot, "Mercurial.ini");
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345 }
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346 } else {
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347 return new File("/etc/mercurial/hgrc");
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348 }
378
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349 }
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350
382
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351 public static File getUserConfigurationFileToWrite(SessionContext ctx) {
379
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352 LinkedHashSet<String> locations = new LinkedHashSet<String>();
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353 final boolean runsOnWindows = runningOnWindows();
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354 if (runsOnWindows) {
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355 locations.add(System.getenv("USERPROFILE"));
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356 }
379
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357 locations.add(System.getenv("HOME"));
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358 locations.remove(null);
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359 for (String loc : locations) {
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360 File location = new File(loc);
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361 File rv = new File(location, ".hgrc");
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362 if (rv.exists() && rv.canWrite()) {
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363 return rv;
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364 }
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365 if (runsOnWindows) {
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366 rv = new File(location, "Mercurial.ini");
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367 if (rv.exists() && rv.canWrite()) {
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368 return rv;
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369 }
378
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370 }
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371 }
379
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372 // fallback to default, let calling code fail with Exception if can't write
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373 return new File(System.getProperty("user.home"), ".hgrc");
378
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374 }
388
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375
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376 public boolean shallCacheRevlogs() {
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377 return shallCacheRevlogsInRepo;
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378 }
407
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379
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380 public static <T> CharSequence join(Iterable<T> col, CharSequence separator) {
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381 if (col == null) {
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382 return String.valueOf(col);
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383 }
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384 Iterator<T> it = col.iterator();
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385 if (!it.hasNext()) {
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386 return "[]";
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387 }
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388 String v = String.valueOf(it.next());
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389 StringBuilder sb = new StringBuilder(v);
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390 while (it.hasNext()) {
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391 sb.append(separator);
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392 v = String.valueOf(it.next());
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393 sb.append(v);
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394 }
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395 return sb;
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396 }
420
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397
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398 /**
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399 * keep an eye on all long to int downcasts to get a chance notice the lost of data
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400 * Use if there's even subtle chance there might be loss
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401 * (ok not to use if there's no way for l to be greater than int)
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402 */
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403 public static int ltoi(long l) {
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404 int i = (int) l;
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405 assert ((long) i) == l : "Loss of data!";
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406 return i;
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407 }
74
6f1b88693d48 Complete refactoring to org.tmatesoft
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408 }