Mercurial > hg4j

annotate src/org/tmatesoft/hg/core/HgUpdateConfigCommand.java @ 498:0205a5c4566b

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Issue 38: preserve user formatting and comments when updating configuration files
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 26 Oct 2012 18:17:15 +0200
parents ba36f66c32b4
children
rev   line source
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1 /*
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2 * Copyright (c) 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.core;
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18
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19 import java.io.File;
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20 import java.io.FileInputStream;
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21 import java.io.FileOutputStream;
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22 import java.io.IOException;
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23 import java.util.LinkedList;
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24 import java.util.List;
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25 import java.util.Map;
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26
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27 import org.tmatesoft.hg.internal.ConfigFile;
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28 import org.tmatesoft.hg.internal.ConfigFileParser;
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29 import org.tmatesoft.hg.internal.Internals;
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30 import org.tmatesoft.hg.repo.HgInternals;
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31 import org.tmatesoft.hg.repo.HgInvalidStateException;
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32 import org.tmatesoft.hg.repo.HgRepository;
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33
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34 /**
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35 * Command to alter Mercurial configuration settings at various levels (system-wide, user-wide, repository-wide).
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36 *
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37 * @author Artem Tikhomirov
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38 * @author TMate Software Ltd.
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39 */
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40 public final class HgUpdateConfigCommand extends HgAbstractCommand<HgUpdateConfigCommand> {
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41
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42 private final SessionContext sessionCtx;
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43 private final File configFile;
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44
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45 private final List<Operation> changes = new LinkedList<Operation>();
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46 private boolean ignoreMissingKeys = false;
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47
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48 private HgUpdateConfigCommand(SessionContext sessionContext, File configurationFile) {
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49 sessionCtx = sessionContext;
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50 configFile = configurationFile;
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51 }
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52
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53 public static HgUpdateConfigCommand forRepository(HgRepository hgRepo) {
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54 return new HgUpdateConfigCommand(hgRepo.getSessionContext(), HgInternals.getImplementationRepo(hgRepo).getFileFromRepoDir("hgrc"));
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55 }
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56
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57 public static HgUpdateConfigCommand forUser(SessionContext ctx) {
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58 return new HgUpdateConfigCommand(ctx, Internals.getUserConfigurationFileToWrite(ctx));
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59 }
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60
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61 public static HgUpdateConfigCommand forInstallation(SessionContext ctx) {
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62 return new HgUpdateConfigCommand(ctx, Internals.getInstallationConfigurationFileToWrite(ctx));
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63 }
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64
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65 /**
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66 * Remove an entry altogether. If no entry with the key found, {@link #execute()} fails.
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67 *
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68 * @param section identifies section to alter, not <code>null</code> or otherwise ill-formed name
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69 * @param key identifies entry within section, not <code>null</code> or otherwise ill-formed name
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70 * @return <code>this</code> for convenience
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71 * @throws IllegalArgumentException if arguments are <code>null</code> or empty
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72 */
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73 public HgUpdateConfigCommand remove(String section, String key) throws IllegalArgumentException {
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74 checkSection(section);
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75 checkKey(key);
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76 changes.add(Operation.deleteEntry(section, key));
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77 return this;
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78 }
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79
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80 /**
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81 * Delete single attribute in a multi-valued property. If specified value not found among values of
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82 * the identified entry, {@link #execute()} fails.
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83 *
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84 * @param section identifies section to alter, not <code>null</code> or otherwise ill-formed name
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85 * @param key identifies entry within section, not <code>null</code> or otherwise ill-formed name
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86 * @param value one of the values to remove, not <code>null</code> or an empty value
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87 * @return <code>this</code> for convenience
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88 * @throws IllegalArgumentException if arguments are <code>null</code> or empty
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89 */
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90 public HgUpdateConfigCommand remove(String section, String key, String value) throws IllegalArgumentException {
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91 checkSection(section);
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92 checkKey(key);
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93 changes.add(Operation.deleteValue(section, key, value));
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94 return this;
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95 }
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96
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97 /**
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98 * Set single-valued property or update multi-valued with a single value
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99 *
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100 * @param section identifies section to alter, not <code>null</code> or otherwise ill-formed name
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101 * @param key identifies entry within section, not <code>null</code> or otherwise ill-formed name
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102 * @param value new value, may be <code>null</code>
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103 * @return <code>this</code> for convenience
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104 * @throws IllegalArgumentException if arguments are <code>null</code> or empty
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105 */
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106 public HgUpdateConfigCommand put(String section, String key, String value) throws IllegalArgumentException {
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107 checkSection(section);
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108 checkKey(key);
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109 changes.add(Operation.setValue(section, key, value));
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110 return this;
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111 }
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112
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113 /**
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114 * Add value to a multi-valued entry. If specified entry not found, {@link #execute()} fails.
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115 *
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116 * @param section identifies section to alter, not <code>null</code> or otherwise ill-formed name
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117 * @param key identifies entry within section, not <code>null</code> or otherwise ill-formed name
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118 * @param value new value to add, not <code>null</code> or an empty value
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119 * @return <code>this</code> for convenience
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120 * @throws IllegalArgumentException if arguments are <code>null</code> or empty
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121 */
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122 public HgUpdateConfigCommand add(String section, String key, String value) throws IllegalArgumentException {
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123 checkSection(section);
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124 checkKey(key);
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125 changes.add(Operation.addValue(section, key, value));
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126 return this;
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127 }
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128
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129 /**
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130 * Tells whether {@link #execute()} shall fail with exception if keys selected for modification were not found.
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131 * If <code>true</code>, missing keys would be silently ignored.
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132 * When <code>false</code>(<em>default</em>), exception would be raised.
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133 *
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134 * @param ignoreMissing pass <code>true</code> to ignore any incorrect keys
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135 * @return <code>this</code> for convenience
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136 */
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137 public HgUpdateConfigCommand ignoreMissing(boolean ignoreMissing) {
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138 ignoreMissingKeys = ignoreMissing;
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139 return this;
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140 }
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141
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142 /**
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143 * Perform configuration file update.
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144 *
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145 * @throws HgMissingConfigElementException if attempt to alter an entry failed to find one, and missing keys are not ignored
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146 * @throws HgIOException when configuration file read/write attemt has failed
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147 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state
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148 */
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149 public void execute() throws HgMissingConfigElementException, HgIOException, HgException {
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150 try {
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151 ConfigFile cfgRead = new ConfigFile(sessionCtx);
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152 cfgRead.addLocation(configFile);
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153 ConfigFileParser cfgWrite = new ConfigFileParser();
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154 FileInputStream fis = new FileInputStream(configFile);
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155 cfgWrite.parse(fis);
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156 fis.close();
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157 for (Operation op : changes) {
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158 if (!ignoreMissingKeys && !cfgRead.hasSection(op.section)) {
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159 throw new HgMissingConfigElementException("Bad section name", op.section, op.key);
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160 }
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161 Map<String, String> sect = cfgRead.getSection(op.section);
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162 if (!ignoreMissingKeys && !sect.containsKey(op.key)) {
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163 throw new HgMissingConfigElementException("Bad key name", op.section, op.key);
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164 }
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165 String oldValue = sect.get(op.key);
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166 if (oldValue == null) {
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167 oldValue = "";
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168 }
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169 switch (op.kind) {
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170 case AddValue: {
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171 String separator = ", "; // XXX shall parse and find out separator kind in use
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172 String newValue = oldValue + separator + op.value;
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173 if (sect.containsKey(op.key)) {
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174 cfgWrite.change(op.section, op.key, newValue);
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175 } else {
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176 cfgWrite.add(op.section, op.key, newValue);
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177 }
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178 break;
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179 }
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180 case DelValue: {
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181 if (!ignoreMissingKeys && (oldValue.length() == 0 || !oldValue.contains(op.value))) {
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182 throw new HgMissingConfigElementException(String.format("Bad value '%s' to delete from '%s'", op.value, oldValue), op.section, op.key);
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183 }
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184 int start = oldValue.indexOf(op.value);
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185 if (start == -1) {
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186 // nothing to change
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187 break;
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188 }
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189 int commaPos = -1;
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190 for (int i = start-1; i >=0; i--) {
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191 if (oldValue.charAt(i) == ',') {
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192 commaPos = i;
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193 break;
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194 }
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195 }
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196 for (int i = start + op.value.length(); commaPos == -1 && i < oldValue.length(); i++) {
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197 if (oldValue.charAt(i) == ',') {
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198 commaPos = i;
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199 break;
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200 }
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201 }
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202 String newValue;
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203 if (commaPos >= 0) {
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204 if (commaPos < start) {
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205 // from preceding comma up to end of value
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206 newValue = oldValue.substring(0, commaPos) + oldValue.substring(start + op.value.length());
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207 } else {
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208 // from value start up to and including subsequent comma
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209 newValue = oldValue.substring(0, start) + oldValue.substring(commaPos+1);
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210 }
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211 } else {
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212 // found no separator, just remove the value
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213 // extra whitespaces (if space, not a comma is a separator) won't hurt
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214 newValue = oldValue.substring(0, start) + oldValue.substring(start + op.value.length());
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215 }
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216 cfgWrite.change(op.section, op.key, newValue);
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217 break;
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218 }
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219 case SetValue: {
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220 if (sect.containsKey(op.key)) {
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221 cfgWrite.change(op.section, op.key, op.value);
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222 } else {
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223 cfgWrite.add(op.section, op.key, op.value);
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224 }
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225 break;
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226 }
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227 case DelEntry: {
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228 cfgWrite.delete(op.section, op.key);
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229 break;
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230 }
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231 default: throw new HgInvalidStateException(String.format("Unknown change %s", op.kind));
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232 }
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233 }
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234 FileOutputStream fos = new FileOutputStream(configFile);
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235 cfgWrite.update(fos);
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236 fos.close();
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237 } catch (IOException ex) {
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238 String m = String.format("Failed to update configuration file %s", configFile);
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239 throw new HgBadArgumentException(m, ex); // TODO [post-1.0] better exception, it's not bad argument case
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240 }
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241 }
498
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242
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243 private static void checkSection(String section) throws IllegalArgumentException {
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244 if (section == null || section.trim().length() == 0) {
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245 throw new IllegalArgumentException(String.format("Section name can't be empty: %s", section));
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246 }
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247 }
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248
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249 private static void checkKey(String key) throws IllegalArgumentException {
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250 if (key == null || key.trim().length() == 0) {
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251 throw new IllegalArgumentException(String.format("Entry key can't be empty: %s", key));
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252 }
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253 }
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254
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255
498
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256 private static class Operation {
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257 private enum OpKind { AddValue, SetValue, DelValue, DelEntry };
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258
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259 public final OpKind kind;
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260 public final String section;
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261 public final String key;
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262 public final String value;
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263
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264 private Operation(OpKind t, String s, String k, String v) {
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265 kind = t;
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266 section = s;
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267 key = k;
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268 value = v;
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269 }
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270
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271 public static Operation deleteEntry(String section, String key) throws IllegalArgumentException {
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272 return new Operation(OpKind.DelEntry, section, key, null);
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273 }
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274 public static Operation deleteValue(String section, String key, String value) throws IllegalArgumentException {
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275 if (value == null || value.trim().length() == 0) {
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276 throw new IllegalArgumentException(String.format("Can't remove empty value '%s'", value));
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277 }
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278 return new Operation(OpKind.DelValue, section, key, value);
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279 }
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280 public static Operation addValue(String section, String key, String value) throws IllegalArgumentException {
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281 if (value == null || value.trim().length() == 0) {
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282 throw new IllegalArgumentException(String.format("Can't add empty value '%s'", value));
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283 }
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284 return new Operation(OpKind.AddValue, section, key, value);
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285 }
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286 public static Operation setValue(String section, String key, String value) throws IllegalArgumentException {
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287 return new Operation(OpKind.SetValue, section, key, value);
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288 }
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289 }
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290 }