Mercurial > hg
annotate mercurial/changelog.py @ 30341:3dfb5a0171c9
manifestctx: add _revlog() function
The `self._repo.manifestlog._revlog` code is getting copy and pasted a lot in
manifestctx. Let's make it a function so it can be reused. This will make future
patches cleaner too.
author | Durham Goode <durham@fb.com> |
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date | Tue, 08 Nov 2016 08:03:43 -0800 |
parents | 5e4f16874a9f |
children | be520fe3a3e9 |
rev | line source |
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1095 | 1 # changelog.py - changelog class for mercurial |
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2 # |
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3 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import collections |
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11 |
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12 from .i18n import _ |
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13 from .node import ( |
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14 bin, |
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15 hex, |
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16 nullid, |
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17 ) |
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18 |
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19 from . import ( |
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20 encoding, |
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21 error, |
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22 revlog, |
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23 util, |
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24 ) |
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25 |
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26 _defaultextra = {'branch': 'default'} |
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27 |
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28 def _string_escape(text): |
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29 """ |
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30 >>> d = {'nl': chr(10), 'bs': chr(92), 'cr': chr(13), 'nul': chr(0)} |
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31 >>> s = "ab%(nl)scd%(bs)s%(bs)sn%(nul)sab%(cr)scd%(bs)s%(nl)s" % d |
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32 >>> s |
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33 'ab\\ncd\\\\\\\\n\\x00ab\\rcd\\\\\\n' |
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34 >>> res = _string_escape(s) |
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35 >>> s == res.decode('string_escape') |
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36 True |
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37 """ |
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38 # subset of the string_escape codec |
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39 text = text.replace('\\', '\\\\').replace('\n', '\\n').replace('\r', '\\r') |
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40 return text.replace('\0', '\\0') |
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41 |
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42 def decodeextra(text): |
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43 """ |
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44 >>> sorted(decodeextra(encodeextra({'foo': 'bar', 'baz': chr(0) + '2'}) |
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45 ... ).iteritems()) |
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46 [('baz', '\\x002'), ('branch', 'default'), ('foo', 'bar')] |
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47 >>> sorted(decodeextra(encodeextra({'foo': 'bar', |
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48 ... 'baz': chr(92) + chr(0) + '2'}) |
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49 ... ).iteritems()) |
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50 [('baz', '\\\\\\x002'), ('branch', 'default'), ('foo', 'bar')] |
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51 """ |
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52 extra = _defaultextra.copy() |
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53 for l in text.split('\0'): |
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54 if l: |
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55 if '\\0' in l: |
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56 # fix up \0 without getting into trouble with \\0 |
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57 l = l.replace('\\\\', '\\\\\n') |
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58 l = l.replace('\\0', '\0') |
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59 l = l.replace('\n', '') |
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60 k, v = l.decode('string_escape').split(':', 1) |
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61 extra[k] = v |
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62 return extra |
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63 |
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64 def encodeextra(d): |
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65 # keys must be sorted to produce a deterministic changelog entry |
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66 items = [_string_escape('%s:%s' % (k, d[k])) for k in sorted(d)] |
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67 return "\0".join(items) |
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68 |
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69 def stripdesc(desc): |
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70 """strip trailing whitespace and leading and trailing empty lines""" |
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71 return '\n'.join([l.rstrip() for l in desc.splitlines()]).strip('\n') |
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72 |
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73 class appender(object): |
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74 '''the changelog index must be updated last on disk, so we use this class |
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75 to delay writes to it''' |
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76 def __init__(self, vfs, name, mode, buf): |
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77 self.data = buf |
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78 fp = vfs(name, mode) |
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79 self.fp = fp |
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80 self.offset = fp.tell() |
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81 self.size = vfs.fstat(fp).st_size |
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82 |
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83 def end(self): |
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84 return self.size + len("".join(self.data)) |
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85 def tell(self): |
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86 return self.offset |
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87 def flush(self): |
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88 pass |
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89 def close(self): |
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90 self.fp.close() |
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91 |
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92 def seek(self, offset, whence=0): |
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93 '''virtual file offset spans real file and data''' |
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94 if whence == 0: |
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95 self.offset = offset |
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96 elif whence == 1: |
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97 self.offset += offset |
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98 elif whence == 2: |
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99 self.offset = self.end() + offset |
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100 if self.offset < self.size: |
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101 self.fp.seek(self.offset) |
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102 |
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103 def read(self, count=-1): |
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104 '''only trick here is reads that span real file and data''' |
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105 ret = "" |
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106 if self.offset < self.size: |
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107 s = self.fp.read(count) |
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108 ret = s |
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109 self.offset += len(s) |
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110 if count > 0: |
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111 count -= len(s) |
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112 if count != 0: |
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113 doff = self.offset - self.size |
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114 self.data.insert(0, "".join(self.data)) |
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115 del self.data[1:] |
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116 s = self.data[0][doff:doff + count] |
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117 self.offset += len(s) |
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118 ret += s |
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119 return ret |
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120 |
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121 def write(self, s): |
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122 self.data.append(str(s)) |
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123 self.offset += len(s) |
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124 |
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125 def _divertopener(opener, target): |
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126 """build an opener that writes in 'target.a' instead of 'target'""" |
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127 def _divert(name, mode='r', checkambig=False): |
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128 if name != target: |
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129 return opener(name, mode) |
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130 return opener(name + ".a", mode) |
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131 return _divert |
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132 |
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133 def _delayopener(opener, target, buf): |
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134 """build an opener that stores chunks in 'buf' instead of 'target'""" |
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135 def _delay(name, mode='r', checkambig=False): |
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136 if name != target: |
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137 return opener(name, mode) |
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138 return appender(opener, name, mode, buf) |
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139 return _delay |
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140 |
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141 _changelogrevision = collections.namedtuple(u'changelogrevision', |
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142 (u'manifest', u'user', u'date', |
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143 u'files', u'description', |
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144 u'extra')) |
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145 |
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146 class changelogrevision(object): |
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147 """Holds results of a parsed changelog revision. |
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148 |
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149 Changelog revisions consist of multiple pieces of data, including |
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150 the manifest node, user, and date. This object exposes a view into |
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151 the parsed object. |
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152 """ |
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153 |
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154 __slots__ = ( |
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155 u'_offsets', |
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156 u'_text', |
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157 ) |
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158 |
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159 def __new__(cls, text): |
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160 if not text: |
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161 return _changelogrevision( |
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162 manifest=nullid, |
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163 user='', |
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164 date=(0, 0), |
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165 files=[], |
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166 description='', |
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167 extra=_defaultextra, |
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168 ) |
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169 |
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170 self = super(changelogrevision, cls).__new__(cls) |
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171 # We could return here and implement the following as an __init__. |
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172 # But doing it here is equivalent and saves an extra function call. |
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173 |
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174 # format used: |
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175 # nodeid\n : manifest node in ascii |
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176 # user\n : user, no \n or \r allowed |
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177 # time tz extra\n : date (time is int or float, timezone is int) |
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178 # : extra is metadata, encoded and separated by '\0' |
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179 # : older versions ignore it |
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180 # files\n\n : files modified by the cset, no \n or \r allowed |
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181 # (.*) : comment (free text, ideally utf-8) |
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182 # |
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183 # changelog v0 doesn't use extra |
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184 |
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185 nl1 = text.index('\n') |
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186 nl2 = text.index('\n', nl1 + 1) |
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187 nl3 = text.index('\n', nl2 + 1) |
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188 |
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189 # The list of files may be empty. Which means nl3 is the first of the |
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190 # double newline that precedes the description. |
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191 if text[nl3 + 1] == '\n': |
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192 doublenl = nl3 |
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193 else: |
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194 doublenl = text.index('\n\n', nl3 + 1) |
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195 |
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196 self._offsets = (nl1, nl2, nl3, doublenl) |
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197 self._text = text |
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198 |
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199 return self |
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200 |
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201 @property |
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202 def manifest(self): |
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203 return bin(self._text[0:self._offsets[0]]) |
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204 |
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205 @property |
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206 def user(self): |
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207 off = self._offsets |
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208 return encoding.tolocal(self._text[off[0] + 1:off[1]]) |
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209 |
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210 @property |
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211 def _rawdate(self): |
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212 off = self._offsets |
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213 dateextra = self._text[off[1] + 1:off[2]] |
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214 return dateextra.split(' ', 2)[0:2] |
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215 |
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216 @property |
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217 def _rawextra(self): |
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218 off = self._offsets |
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219 dateextra = self._text[off[1] + 1:off[2]] |
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220 fields = dateextra.split(' ', 2) |
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221 if len(fields) != 3: |
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222 return None |
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223 |
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224 return fields[2] |
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225 |
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226 @property |
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227 def date(self): |
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228 raw = self._rawdate |
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229 time = float(raw[0]) |
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230 # Various tools did silly things with the timezone. |
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231 try: |
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232 timezone = int(raw[1]) |
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233 except ValueError: |
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234 timezone = 0 |
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235 |
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236 return time, timezone |
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237 |
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238 @property |
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239 def extra(self): |
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240 raw = self._rawextra |
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241 if raw is None: |
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242 return _defaultextra |
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243 |
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244 return decodeextra(raw) |
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245 |
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246 @property |
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247 def files(self): |
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248 off = self._offsets |
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249 if off[2] == off[3]: |
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250 return [] |
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251 |
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252 return self._text[off[2] + 1:off[3]].split('\n') |
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253 |
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254 @property |
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255 def description(self): |
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256 return encoding.tolocal(self._text[self._offsets[3] + 2:]) |
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257 |
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258 class changelog(revlog.revlog): |
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259 def __init__(self, opener): |
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260 revlog.revlog.__init__(self, opener, "00changelog.i", |
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261 checkambig=True) |
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262 if self._initempty: |
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263 # changelogs don't benefit from generaldelta |
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264 self.version &= ~revlog.REVLOGGENERALDELTA |
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265 self._generaldelta = False |
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266 |
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267 # Delta chains for changelogs tend to be very small because entries |
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268 # tend to be small and don't delta well with each. So disable delta |
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269 # chains. |
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270 self.storedeltachains = False |
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271 |
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272 self._realopener = opener |
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273 self._delayed = False |
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274 self._delaybuf = None |
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275 self._divert = False |
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276 self.filteredrevs = frozenset() |
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277 |
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278 def tip(self): |
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279 """filtered version of revlog.tip""" |
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280 for i in xrange(len(self) -1, -2, -1): |
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281 if i not in self.filteredrevs: |
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282 return self.node(i) |
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283 |
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284 def __contains__(self, rev): |
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285 """filtered version of revlog.__contains__""" |
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286 return (0 <= rev < len(self) |
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287 and rev not in self.filteredrevs) |
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288 |
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289 def __iter__(self): |
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290 """filtered version of revlog.__iter__""" |
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291 if len(self.filteredrevs) == 0: |
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292 return revlog.revlog.__iter__(self) |
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293 |
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294 def filterediter(): |
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295 for i in xrange(len(self)): |
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296 if i not in self.filteredrevs: |
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297 yield i |
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298 |
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299 return filterediter() |
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300 |
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301 def revs(self, start=0, stop=None): |
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302 """filtered version of revlog.revs""" |
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303 for i in super(changelog, self).revs(start, stop): |
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304 if i not in self.filteredrevs: |
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305 yield i |
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306 |
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307 @util.propertycache |
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308 def nodemap(self): |
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309 # XXX need filtering too |
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310 self.rev(self.node(0)) |
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311 return self._nodecache |
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312 |
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313 def reachableroots(self, minroot, heads, roots, includepath=False): |
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314 return self.index.reachableroots2(minroot, heads, roots, includepath) |
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315 |
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316 def headrevs(self): |
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317 if self.filteredrevs: |
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318 try: |
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319 return self.index.headrevsfiltered(self.filteredrevs) |
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320 # AttributeError covers non-c-extension environments and |
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321 # old c extensions without filter handling. |
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322 except AttributeError: |
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323 return self._headrevs() |
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324 |
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325 return super(changelog, self).headrevs() |
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326 |
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327 def strip(self, *args, **kwargs): |
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328 # XXX make something better than assert |
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329 # We can't expect proper strip behavior if we are filtered. |
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330 assert not self.filteredrevs |
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331 super(changelog, self).strip(*args, **kwargs) |
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332 |
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333 def rev(self, node): |
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334 """filtered version of revlog.rev""" |
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335 r = super(changelog, self).rev(node) |
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336 if r in self.filteredrevs: |
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337 raise error.FilteredLookupError(hex(node), self.indexfile, |
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338 _('filtered node')) |
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339 return r |
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340 |
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341 def node(self, rev): |
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342 """filtered version of revlog.node""" |
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343 if rev in self.filteredrevs: |
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344 raise error.FilteredIndexError(rev) |
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345 return super(changelog, self).node(rev) |
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346 |
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347 def linkrev(self, rev): |
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348 """filtered version of revlog.linkrev""" |
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349 if rev in self.filteredrevs: |
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350 raise error.FilteredIndexError(rev) |
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351 return super(changelog, self).linkrev(rev) |
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352 |
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353 def parentrevs(self, rev): |
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354 """filtered version of revlog.parentrevs""" |
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355 if rev in self.filteredrevs: |
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356 raise error.FilteredIndexError(rev) |
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357 return super(changelog, self).parentrevs(rev) |
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358 |
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359 def flags(self, rev): |
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360 """filtered version of revlog.flags""" |
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361 if rev in self.filteredrevs: |
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362 raise error.FilteredIndexError(rev) |
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363 return super(changelog, self).flags(rev) |
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364 |
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365 def delayupdate(self, tr): |
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366 "delay visibility of index updates to other readers" |
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367 |
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368 if not self._delayed: |
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369 if len(self) == 0: |
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370 self._divert = True |
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371 if self._realopener.exists(self.indexfile + '.a'): |
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372 self._realopener.unlink(self.indexfile + '.a') |
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373 self.opener = _divertopener(self._realopener, self.indexfile) |
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374 else: |
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375 self._delaybuf = [] |
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376 self.opener = _delayopener(self._realopener, self.indexfile, |
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377 self._delaybuf) |
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378 self._delayed = True |
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379 tr.addpending('cl-%i' % id(self), self._writepending) |
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380 tr.addfinalize('cl-%i' % id(self), self._finalize) |
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381 |
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382 def _finalize(self, tr): |
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383 "finalize index updates" |
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384 self._delayed = False |
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385 self.opener = self._realopener |
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386 # move redirected index data back into place |
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387 if self._divert: |
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388 assert not self._delaybuf |
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389 tmpname = self.indexfile + ".a" |
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390 nfile = self.opener.open(tmpname) |
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391 nfile.close() |
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392 self.opener.rename(tmpname, self.indexfile, checkambig=True) |
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393 elif self._delaybuf: |
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394 fp = self.opener(self.indexfile, 'a', checkambig=True) |
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395 fp.write("".join(self._delaybuf)) |
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396 fp.close() |
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397 self._delaybuf = None |
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398 self._divert = False |
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399 # split when we're done |
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400 self.checkinlinesize(tr) |
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401 |
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402 def readpending(self, file): |
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403 """read index data from a "pending" file |
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404 |
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405 During a transaction, the actual changeset data is already stored in the |
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406 main file, but not yet finalized in the on-disk index. Instead, a |
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407 "pending" index is written by the transaction logic. If this function |
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408 is running, we are likely in a subprocess invoked in a hook. The |
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409 subprocess is informed that it is within a transaction and needs to |
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410 access its content. |
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411 |
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412 This function will read all the index data out of the pending file and |
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413 overwrite the main index.""" |
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414 |
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415 if not self.opener.exists(file): |
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416 return # no pending data for changelog |
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417 r = revlog.revlog(self.opener, file) |
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418 self.index = r.index |
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419 self.nodemap = r.nodemap |
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420 self._nodecache = r._nodecache |
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421 self._chunkcache = r._chunkcache |
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422 |
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423 def _writepending(self, tr): |
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424 "create a file containing the unfinalized state for pretxnchangegroup" |
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425 if self._delaybuf: |
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426 # make a temporary copy of the index |
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427 fp1 = self._realopener(self.indexfile) |
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428 pendingfilename = self.indexfile + ".a" |
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429 # register as a temp file to ensure cleanup on failure |
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430 tr.registertmp(pendingfilename) |
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431 # write existing data |
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432 fp2 = self._realopener(pendingfilename, "w") |
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433 fp2.write(fp1.read()) |
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434 # add pending data |
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435 fp2.write("".join(self._delaybuf)) |
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436 fp2.close() |
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437 # switch modes so finalize can simply rename |
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438 self._delaybuf = None |
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439 self._divert = True |
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440 self.opener = _divertopener(self._realopener, self.indexfile) |
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441 |
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442 if self._divert: |
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443 return True |
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444 |
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445 return False |
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446 |
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447 def checkinlinesize(self, tr, fp=None): |
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448 if not self._delayed: |
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449 revlog.revlog.checkinlinesize(self, tr, fp) |
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450 |
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451 def read(self, node): |
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452 """Obtain data from a parsed changelog revision. |
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453 |
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454 Returns a 6-tuple of: |
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455 |
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456 - manifest node in binary |
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457 - author/user as a localstr |
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458 - date as a 2-tuple of (time, timezone) |
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459 - list of files |
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460 - commit message as a localstr |
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461 - dict of extra metadata |
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462 |
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463 Unless you need to access all fields, consider calling |
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464 ``changelogrevision`` instead, as it is faster for partial object |
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465 access. |
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466 """ |
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467 c = changelogrevision(self.revision(node)) |
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468 return ( |
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469 c.manifest, |
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470 c.user, |
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471 c.date, |
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472 c.files, |
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473 c.description, |
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474 c.extra |
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475 ) |
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476 |
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477 def changelogrevision(self, nodeorrev): |
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478 """Obtain a ``changelogrevision`` for a node or revision.""" |
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479 return changelogrevision(self.revision(nodeorrev)) |
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480 |
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481 def readfiles(self, node): |
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482 """ |
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483 short version of read that only returns the files modified by the cset |
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484 """ |
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485 text = self.revision(node) |
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486 if not text: |
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487 return [] |
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488 last = text.index("\n\n") |
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489 l = text[:last].split('\n') |
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490 return l[3:] |
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491 |
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492 def add(self, manifest, files, desc, transaction, p1, p2, |
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493 user, date=None, extra=None): |
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494 # Convert to UTF-8 encoded bytestrings as the very first |
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495 # thing: calling any method on a localstr object will turn it |
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496 # into a str object and the cached UTF-8 string is thus lost. |
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497 user, desc = encoding.fromlocal(user), encoding.fromlocal(desc) |
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498 |
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499 user = user.strip() |
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500 # An empty username or a username with a "\n" will make the |
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501 # revision text contain two "\n\n" sequences -> corrupt |
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502 # repository since read cannot unpack the revision. |
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503 if not user: |
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504 raise error.RevlogError(_("empty username")) |
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505 if "\n" in user: |
7633 | 506 raise error.RevlogError(_("username %s contains a newline") |
507 % repr(user)) | |
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508 |
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509 desc = stripdesc(desc) |
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510 |
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511 if date: |
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512 parseddate = "%d %d" % util.parsedate(date) |
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513 else: |
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514 parseddate = "%d %d" % util.makedate() |
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515 if extra: |
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516 branch = extra.get("branch") |
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517 if branch in ("default", ""): |
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518 del extra["branch"] |
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519 elif branch in (".", "null", "tip"): |
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520 raise error.RevlogError(_('the name \'%s\' is reserved') |
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521 % branch) |
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522 if extra: |
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523 extra = encodeextra(extra) |
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524 parseddate = "%s %s" % (parseddate, extra) |
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525 l = [hex(manifest), user, parseddate] + sorted(files) + ["", desc] |
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526 text = "\n".join(l) |
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add __len__ and __iter__ methods to repo and revlog
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527 return self.addrevision(text, transaction, len(self), p1, p2) |
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528 |
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branchmap: cache open/closed branch head information
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529 def branchinfo(self, rev): |
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530 """return the branch name and open/close state of a revision |
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531 |
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changelog: please check-code and remove tabs
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532 This function exists because creating a changectx object |
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533 just to access this is costly.""" |
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534 extra = self.read(rev)[5] |
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535 return encoding.tolocal(extra.get("branch")), 'close' in extra |