Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgIgnore.java @ 176:a8df7162ec75

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Extracting complete branch using remote between call to detect incoming changes is done. Arguments reorderd in remote repo to better match Hg server ideology, not my mental convenience
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 02 Apr 2011 03:01:14 +0200
parents 8248aae33f7d
children fad70a9e6c7f
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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18
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19 import java.io.BufferedReader;
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20 import java.io.File;
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21 import java.io.FileReader;
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22 import java.io.IOException;
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23 import java.util.ArrayList;
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24 import java.util.Collections;
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25 import java.util.List;
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26 import java.util.regex.Pattern;
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27
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28 import org.tmatesoft.hg.util.Path;
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29
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30 /**
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31 * Handling of ignored paths according to .hgignore configuration
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32 *
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33 * @author Artem Tikhomirov
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34 * @author TMate Software Ltd.
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35 */
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36 public class HgIgnore {
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37
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38 private List<Pattern> entries;
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39
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40 HgIgnore() {
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41 entries = Collections.emptyList();
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42 }
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43
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44 /* package-local */void read(File hgignoreFile) throws IOException {
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45 if (!hgignoreFile.exists()) {
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46 return;
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47 }
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48 ArrayList<Pattern> result = new ArrayList<Pattern>(entries); // start with existing
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49 String syntax = "regex"; // or "glob"
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50 BufferedReader fr = new BufferedReader(new FileReader(hgignoreFile));
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51 String line;
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52 while ((line = fr.readLine()) != null) {
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53 line = line.trim();
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54 if (line.startsWith("syntax:")) {
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55 syntax = line.substring("syntax:".length()).trim();
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56 if (!"regex".equals(syntax) && !"glob".equals(syntax)) {
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57 throw new IllegalStateException(line);
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58 }
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59 } else if (line.length() > 0) {
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60 // shall I account for local paths in the file (i.e.
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61 // back-slashed on windows)?
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62 int x;
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63 if ((x = line.indexOf('#')) >= 0) {
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64 line = line.substring(0, x).trim();
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65 if (line.length() == 0) {
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66 continue;
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67 }
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68 }
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69 if ("glob".equals(syntax)) {
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70 // hgignore(5)
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71 // (http://www.selenic.com/mercurial/hgignore.5.html) says slashes '\' are escape characters,
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72 // hence no special treatment of Windows path
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73 // however, own attempts make me think '\' on Windows are not treated as escapes
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74 line = glob2regex(line);
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75 }
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76 result.add(Pattern.compile(line)); // case-sensitive
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77 }
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78 }
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79 result.trimToSize();
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80 entries = result;
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81 }
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82
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83 // note, #isIgnored(), even if queried for directories and returned positive reply, may still get
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84 // a file from that ignored folder to get examined. Thus, patterns like "bin" shall match not only a folder,
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85 // but any file under that folder as well
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86 // Alternatively, file walker may memorize folder is ignored and uses this information for all nested files. However,
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87 // this approach would require walker (a) return directories (b) provide nesting information. This may become
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88 // troublesome when one walks not over io.File, but Eclipse's IResource or any other custom VFS.
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89 //
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90 //
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91 // might be interesting, although looks like of no direct use in my case
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92 // @see http://stackoverflow.com/questions/1247772/is-there-an-equivalent-of-java-util-regex-for-glob-type-patterns
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93 private String glob2regex(String line) {
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94 assert line.length() > 0;
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95 StringBuilder sb = new StringBuilder(line.length() + 10);
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96 sb.append('^'); // help avoid matcher.find() to match 'bin' pattern in the middle of the filename
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97 int start = 0, end = line.length() - 1;
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98 // '*' at the beginning and end of a line are useless for Pattern
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99 // XXX although how about **.txt - such globs can be seen in a config, are they valid for HgIgnore?
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100 while (start <= end && line.charAt(start) == '*') start++;
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101 while (end > start && line.charAt(end) == '*') end--;
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102
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103 for (int i = start; i <= end; i++) {
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104 char ch = line.charAt(i);
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105 if (ch == '.' || ch == '\\') {
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106 sb.append('\\');
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107 } else if (ch == '?') {
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108 // simple '.' substitution might work out, however, more formally
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109 // a char class seems more appropriate to avoid accidentally
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110 // matching a subdirectory with ? char (i.e. /a/b?d against /a/bad, /a/bed and /a/b/d)
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111 // @see http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_13_03
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112 // quote: "The slash character in a pathname shall be explicitly matched by using one or more slashes in the pattern;
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113 // it shall neither be matched by the asterisk or question-mark special characters nor by a bracket expression"
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114 sb.append("[^/]");
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115 continue;
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116 } else if (ch == '*') {
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117 sb.append("[^/]*?");
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118 continue;
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119 }
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120 sb.append(ch);
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121 }
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122 return sb.toString();
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123 }
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124
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125 // TODO use PathGlobMatcher
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126 public boolean isIgnored(Path path) {
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127 for (Pattern p : entries) {
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128 if (p.matcher(path).find()) {
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129 return true;
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130 }
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131 }
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132 return false;
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133 }
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134 }