Mercurial > hg
annotate mercurial/changelog.py @ 6736:369ddc9c0339
lookup: optimize '.'
Remove error messages as behavior is documented in hg help revs
author | Matt Mackall <mpm@selenic.com> |
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date | Wed, 25 Jun 2008 17:33:34 -0500 |
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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 |
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6 # of the GNU General Public License, incorporated herein by reference. |
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7 |
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8 from node import bin, hex, nullid |
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9 from revlog import revlog |
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11 |
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12 def _string_escape(text): |
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13 """ |
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14 >>> d = {'nl': chr(10), 'bs': chr(92), 'cr': chr(13), 'nul': chr(0)} |
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15 >>> s = "ab%(nl)scd%(bs)s%(bs)sn%(nul)sab%(cr)scd%(bs)s%(nl)s" % d |
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16 >>> s |
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17 'ab\\ncd\\\\\\\\n\\x00ab\\rcd\\\\\\n' |
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18 >>> res = _string_escape(s) |
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19 >>> s == res.decode('string_escape') |
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20 True |
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21 """ |
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22 # subset of the string_escape codec |
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23 text = text.replace('\\', '\\\\').replace('\n', '\\n').replace('\r', '\\r') |
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24 return text.replace('\0', '\\0') |
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25 |
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26 class appender: |
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27 '''the changelog index must be update last on disk, so we use this class |
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28 to delay writes to it''' |
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29 def __init__(self, fp, buf): |
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30 self.data = buf |
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31 self.fp = fp |
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32 self.offset = fp.tell() |
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33 self.size = util.fstat(fp).st_size |
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34 |
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35 def end(self): |
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36 return self.size + len("".join(self.data)) |
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37 def tell(self): |
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38 return self.offset |
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39 def flush(self): |
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40 pass |
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41 def close(self): |
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42 self.fp.close() |
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43 |
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44 def seek(self, offset, whence=0): |
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45 '''virtual file offset spans real file and data''' |
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46 if whence == 0: |
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47 self.offset = offset |
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48 elif whence == 1: |
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49 self.offset += offset |
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50 elif whence == 2: |
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51 self.offset = self.end() + offset |
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52 if self.offset < self.size: |
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53 self.fp.seek(self.offset) |
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54 |
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55 def read(self, count=-1): |
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56 '''only trick here is reads that span real file and data''' |
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57 ret = "" |
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58 if self.offset < self.size: |
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59 s = self.fp.read(count) |
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60 ret = s |
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61 self.offset += len(s) |
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62 if count > 0: |
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63 count -= len(s) |
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64 if count != 0: |
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65 doff = self.offset - self.size |
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66 self.data.insert(0, "".join(self.data)) |
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67 del self.data[1:] |
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68 s = self.data[0][doff:doff+count] |
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69 self.offset += len(s) |
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70 ret += s |
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71 return ret |
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72 |
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73 def write(self, s): |
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74 self.data.append(str(s)) |
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75 self.offset += len(s) |
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76 |
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77 class changelog(revlog): |
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78 def __init__(self, opener): |
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79 revlog.__init__(self, opener, "00changelog.i") |
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80 |
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81 def delayupdate(self): |
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82 "delay visibility of index updates to other readers" |
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83 self._realopener = self.opener |
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84 self.opener = self._delayopener |
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85 self._delaycount = self.count() |
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86 self._delaybuf = [] |
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87 self._delayname = None |
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88 |
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89 def finalize(self, tr): |
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90 "finalize index updates" |
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91 self.opener = self._realopener |
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92 # move redirected index data back into place |
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93 if self._delayname: |
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94 util.rename(self._delayname + ".a", self._delayname) |
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95 elif self._delaybuf: |
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96 fp = self.opener(self.indexfile, 'a') |
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97 fp.write("".join(self._delaybuf)) |
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98 fp.close() |
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99 del self._delaybuf |
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100 # split when we're done |
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101 self.checkinlinesize(tr) |
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102 |
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103 def _delayopener(self, name, mode='r'): |
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104 fp = self._realopener(name, mode) |
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105 # only divert the index |
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106 if not name == self.indexfile: |
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107 return fp |
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108 # if we're doing an initial clone, divert to another file |
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109 if self._delaycount == 0: |
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110 self._delayname = fp.name |
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111 if not self.count(): |
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112 # make sure to truncate the file |
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113 mode = mode.replace('a', 'w') |
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114 return self._realopener(name + ".a", mode) |
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115 # otherwise, divert to memory |
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116 return appender(fp, self._delaybuf) |
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117 |
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118 def checkinlinesize(self, tr, fp=None): |
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119 if self.opener == self._delayopener: |
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120 return |
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121 return revlog.checkinlinesize(self, tr, fp) |
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122 |
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123 def decode_extra(self, text): |
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124 extra = {} |
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125 for l in text.split('\0'): |
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126 if l: |
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127 k, v = l.decode('string_escape').split(':', 1) |
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128 extra[k] = v |
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129 return extra |
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130 |
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131 def encode_extra(self, d): |
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132 # keys must be sorted to produce a deterministic changelog entry |
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133 keys = d.keys() |
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134 keys.sort() |
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135 items = [_string_escape('%s:%s' % (k, d[k])) for k in keys] |
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136 return "\0".join(items) |
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137 |
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138 def read(self, node): |
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139 """ |
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140 format used: |
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141 nodeid\n : manifest node in ascii |
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142 user\n : user, no \n or \r allowed |
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143 time tz extra\n : date (time is int or float, timezone is int) |
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144 : extra is metadatas, encoded and separated by '\0' |
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145 : older versions ignore it |
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146 files\n\n : files modified by the cset, no \n or \r allowed |
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147 (.*) : comment (free text, ideally utf-8) |
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148 |
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149 changelog v0 doesn't use extra |
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150 """ |
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151 text = self.revision(node) |
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153 return (nullid, "", (0, 0), [], "", {'branch': 'default'}) |
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154 last = text.index("\n\n") |
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155 desc = util.tolocal(text[last + 2:]) |
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156 l = text[:last].split('\n') |
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157 manifest = bin(l[0]) |
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158 user = util.tolocal(l[1]) |
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159 |
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160 extra_data = l[2].split(' ', 2) |
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161 if len(extra_data) != 3: |
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162 time = float(extra_data.pop(0)) |
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163 try: |
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164 # various tools did silly things with the time zone field. |
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165 timezone = int(extra_data[0]) |
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166 except: |
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167 timezone = 0 |
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168 extra = {} |
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169 else: |
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170 time, timezone, extra = extra_data |
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171 time, timezone = float(time), int(timezone) |
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172 extra = self.decode_extra(extra) |
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173 if not extra.get('branch'): |
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174 extra['branch'] = 'default' |
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175 files = l[3:] |
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176 return (manifest, user, (time, timezone), files, desc, extra) |
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177 |
203 | 178 def add(self, manifest, list, desc, transaction, p1=None, p2=None, |
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179 user=None, date=None, extra={}): |
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180 |
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181 user, desc = util.fromlocal(user), util.fromlocal(desc) |
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182 |
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183 if date: |
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184 parseddate = "%d %d" % util.parsedate(date) |
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185 else: |
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186 parseddate = "%d %d" % util.makedate() |
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187 if extra and extra.get("branch") in ("default", ""): |
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188 del extra["branch"] |
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189 if extra: |
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190 extra = self.encode_extra(extra) |
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191 parseddate = "%s %s" % (parseddate, extra) |
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192 list.sort() |
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193 l = [hex(manifest), user, parseddate] + list + ["", desc] |
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194 text = "\n".join(l) |
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195 return self.addrevision(text, transaction, self.count(), p1, p2) |