annotate mercurial/repoview.py @ 37733:d43810fe52b0

tests: port inline extensions in test-http.t to Python 3 Differential Revision: https://phab.mercurial-scm.org/D3342
author Augie Fackler <augie@google.com>
date Fri, 13 Apr 2018 21:22:05 -0400
parents 07fdac1d5c66
children 5b592ac502ef
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1 # repoview.py - Filtered view of a localrepo object
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2 #
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3 # Copyright 2012 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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4 # Logilab SA <contact@logilab.fr>
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5 #
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6 # This software may be used and distributed according to the terms of the
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7 # GNU General Public License version 2 or any later version.
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8
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9 from __future__ import absolute_import
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10
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11 import copy
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12 import weakref
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13
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14 from .node import nullrev
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15 from . import (
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16 obsolete,
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17 phases,
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18 pycompat,
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19 tags as tagsmod,
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20 )
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21
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22 def hideablerevs(repo):
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23 """Revision candidates to be hidden
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24
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25 This is a standalone function to allow extensions to wrap it.
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26
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27 Because we use the set of immutable changesets as a fallback subset in
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28 branchmap (see mercurial.branchmap.subsettable), you cannot set "public"
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29 changesets as "hideable". Doing so would break multiple code assertions and
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30 lead to crashes."""
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31 return obsolete.getrevs(repo, 'obsolete')
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32
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33 def pinnedrevs(repo):
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34 """revisions blocking hidden changesets from being filtered
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35 """
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36
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37 cl = repo.changelog
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38 pinned = set()
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39 pinned.update([par.rev() for par in repo[None].parents()])
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40 pinned.update([cl.rev(bm) for bm in repo._bookmarks.values()])
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41
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42 tags = {}
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43 tagsmod.readlocaltags(repo.ui, repo, tags, {})
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44 if tags:
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45 rev, nodemap = cl.rev, cl.nodemap
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46 pinned.update(rev(t[0]) for t in tags.values() if t[0] in nodemap)
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47 return pinned
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49
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50 def _revealancestors(pfunc, hidden, revs):
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51 """reveals contiguous chains of hidden ancestors of 'revs' by removing them
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52 from 'hidden'
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53
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54 - pfunc(r): a funtion returning parent of 'r',
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55 - hidden: the (preliminary) hidden revisions, to be updated
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56 - revs: iterable of revnum,
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57
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58 (Ancestors are revealed exclusively, i.e. the elements in 'revs' are
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59 *not* revealed)
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60 """
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61 stack = list(revs)
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62 while stack:
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63 for p in pfunc(stack.pop()):
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64 if p != nullrev and p in hidden:
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65 hidden.remove(p)
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66 stack.append(p)
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67
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68 def computehidden(repo, visibilityexceptions=None):
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69 """compute the set of hidden revision to filter
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70
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71 During most operation hidden should be filtered."""
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72 assert not repo.changelog.filteredrevs
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73
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74 hidden = hideablerevs(repo)
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75 if hidden:
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76 hidden = set(hidden - pinnedrevs(repo))
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77 if visibilityexceptions:
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78 hidden -= visibilityexceptions
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79 pfunc = repo.changelog.parentrevs
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80 mutablephases = (phases.draft, phases.secret)
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81 mutable = repo._phasecache.getrevset(repo, mutablephases)
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82
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83 visible = mutable - hidden
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84 _revealancestors(pfunc, hidden, visible)
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85 return frozenset(hidden)
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86
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87 def computeunserved(repo, visibilityexceptions=None):
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88 """compute the set of revision that should be filtered when used a server
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89
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90 Secret and hidden changeset should not pretend to be here."""
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91 assert not repo.changelog.filteredrevs
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92 # fast path in simple case to avoid impact of non optimised code
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93 hiddens = filterrevs(repo, 'visible')
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94 if phases.hassecret(repo):
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95 cl = repo.changelog
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96 secret = phases.secret
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97 getphase = repo._phasecache.phase
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98 first = min(cl.rev(n) for n in repo._phasecache.phaseroots[secret])
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99 revs = cl.revs(start=first)
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100 secrets = set(r for r in revs if getphase(repo, r) >= secret)
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101 return frozenset(hiddens | secrets)
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102 else:
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103 return hiddens
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104
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105 def computemutable(repo, visibilityexceptions=None):
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106 assert not repo.changelog.filteredrevs
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107 # fast check to avoid revset call on huge repo
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108 if any(repo._phasecache.phaseroots[1:]):
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109 getphase = repo._phasecache.phase
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110 maymutable = filterrevs(repo, 'base')
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111 return frozenset(r for r in maymutable if getphase(repo, r))
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112 return frozenset()
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113
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114 def computeimpactable(repo, visibilityexceptions=None):
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115 """Everything impactable by mutable revision
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116
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117 The immutable filter still have some chance to get invalidated. This will
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118 happen when:
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119
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120 - you garbage collect hidden changeset,
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121 - public phase is moved backward,
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122 - something is changed in the filtering (this could be fixed)
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123
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124 This filter out any mutable changeset and any public changeset that may be
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125 impacted by something happening to a mutable revision.
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126
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127 This is achieved by filtered everything with a revision number egal or
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128 higher than the first mutable changeset is filtered."""
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129 assert not repo.changelog.filteredrevs
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130 cl = repo.changelog
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131 firstmutable = len(cl)
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132 for roots in repo._phasecache.phaseroots[1:]:
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133 if roots:
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134 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots))
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135 # protect from nullrev root
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136 firstmutable = max(0, firstmutable)
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137 return frozenset(xrange(firstmutable, len(cl)))
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138
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139 # function to compute filtered set
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140 #
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141 # When adding a new filter you MUST update the table at:
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142 # mercurial.branchmap.subsettable
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143 # Otherwise your filter will have to recompute all its branches cache
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144 # from scratch (very slow).
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145 filtertable = {'visible': computehidden,
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146 'visible-hidden': computehidden,
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147 'served': computeunserved,
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148 'immutable': computemutable,
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149 'base': computeimpactable}
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150
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151 def filterrevs(repo, filtername, visibilityexceptions=None):
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152 """returns set of filtered revision for this filter name
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153
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154 visibilityexceptions is a set of revs which must are exceptions for
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155 hidden-state and must be visible. They are dynamic and hence we should not
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156 cache it's result"""
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157 if filtername not in repo.filteredrevcache:
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158 func = filtertable[filtername]
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159 if visibilityexceptions:
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160 return func(repo.unfiltered, visibilityexceptions)
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161 repo.filteredrevcache[filtername] = func(repo.unfiltered())
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162 return repo.filteredrevcache[filtername]
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163
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164 class repoview(object):
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165 """Provide a read/write view of a repo through a filtered changelog
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166
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167 This object is used to access a filtered version of a repository without
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168 altering the original repository object itself. We can not alter the
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169 original object for two main reasons:
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170 - It prevents the use of a repo with multiple filters at the same time. In
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171 particular when multiple threads are involved.
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172 - It makes scope of the filtering harder to control.
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173
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174 This object behaves very closely to the original repository. All attribute
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175 operations are done on the original repository:
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176 - An access to `repoview.someattr` actually returns `repo.someattr`,
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177 - A write to `repoview.someattr` actually sets value of `repo.someattr`,
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178 - A deletion of `repoview.someattr` actually drops `someattr`
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179 from `repo.__dict__`.
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180
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181 The only exception is the `changelog` property. It is overridden to return
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182 a (surface) copy of `repo.changelog` with some revisions filtered. The
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183 `filtername` attribute of the view control the revisions that need to be
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184 filtered. (the fact the changelog is copied is an implementation detail).
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185
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186 Unlike attributes, this object intercepts all method calls. This means that
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187 all methods are run on the `repoview` object with the filtered `changelog`
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188 property. For this purpose the simple `repoview` class must be mixed with
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189 the actual class of the repository. This ensures that the resulting
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190 `repoview` object have the very same methods than the repo object. This
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191 leads to the property below.
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192
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193 repoview.method() --> repo.__class__.method(repoview)
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194
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195 The inheritance has to be done dynamically because `repo` can be of any
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196 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`.
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197 """
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198
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199 def __init__(self, repo, filtername, visibilityexceptions=None):
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200 object.__setattr__(self, r'_unfilteredrepo', repo)
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201 object.__setattr__(self, r'filtername', filtername)
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202 object.__setattr__(self, r'_clcachekey', None)
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203 object.__setattr__(self, r'_clcache', None)
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204 # revs which are exceptions and must not be hidden
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205 object.__setattr__(self, r'_visibilityexceptions',
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206 visibilityexceptions)
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207
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208 # not a propertycache on purpose we shall implement a proper cache later
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209 @property
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210 def changelog(self):
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211 """return a filtered version of the changeset
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212
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213 this changelog must not be used for writing"""
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214 # some cache may be implemented later
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215 unfi = self._unfilteredrepo
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216 unfichangelog = unfi.changelog
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217 # bypass call to changelog.method
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218 unfiindex = unfichangelog.index
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219 unfilen = len(unfiindex) - 1
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220 unfinode = unfiindex[unfilen - 1][7]
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221
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222 revs = filterrevs(unfi, self.filtername, self._visibilityexceptions)
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223 cl = self._clcache
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224 newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed)
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225 # if cl.index is not unfiindex, unfi.changelog would be
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226 # recreated, and our clcache refers to garbage object
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227 if (cl is not None and
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228 (cl.index is not unfiindex or newkey != self._clcachekey)):
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229 cl = None
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230 # could have been made None by the previous if
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231 if cl is None:
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232 cl = copy.copy(unfichangelog)
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233 cl.filteredrevs = revs
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234 object.__setattr__(self, r'_clcache', cl)
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235 object.__setattr__(self, r'_clcachekey', newkey)
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236 return cl
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237
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238 def unfiltered(self):
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239 """Return an unfiltered version of a repo"""
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240 return self._unfilteredrepo
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241
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Pulkit Goyal <7895pulkit@gmail.com>
parents: 35249
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242 def filtered(self, name, visibilityexceptions=None):
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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243 """Return a filtered version of a repository"""
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Pulkit Goyal <7895pulkit@gmail.com>
parents: 35249
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244 if name == self.filtername and not visibilityexceptions:
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245 return self
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Pulkit Goyal <7895pulkit@gmail.com>
parents: 35249
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246 return self.unfiltered().filtered(name, visibilityexceptions)
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247
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d4ad9d695a9e repoview: include filter name in repr for debugging
Yuya Nishihara <yuya@tcha.org>
parents: 35248
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248 def __repr__(self):
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Yuya Nishihara <yuya@tcha.org>
parents: 35248
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249 return r'<%s:%s %r>' % (self.__class__.__name__,
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250 pycompat.sysstr(self.filtername),
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Yuya Nishihara <yuya@tcha.org>
parents: 35248
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251 self.unfiltered())
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252
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253 # everything access are forwarded to the proxied repo
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254 def __getattr__(self, attr):
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255 return getattr(self._unfilteredrepo, attr)
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256
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257 def __setattr__(self, attr, value):
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258 return setattr(self._unfilteredrepo, attr, value)
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259
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260 def __delattr__(self, attr):
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261 return delattr(self._unfilteredrepo, attr)
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c752fbe228fb repoview: extract a factory function of proxy class
Yuya Nishihara <yuya@tcha.org>
parents: 34649
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262
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Yuya Nishihara <yuya@tcha.org>
parents: 34649
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263 # Python <3.4 easily leaks types via __mro__. See
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Yuya Nishihara <yuya@tcha.org>
parents: 34649
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264 # https://bugs.python.org/issue17950. We cache dynamically created types
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parents: 34649
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265 # so they won't be leaked on every invocation of repo.filtered().
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Yuya Nishihara <yuya@tcha.org>
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266 _filteredrepotypes = weakref.WeakKeyDictionary()
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267
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parents: 34649
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268 def newtype(base):
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Yuya Nishihara <yuya@tcha.org>
parents: 34649
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269 """Create a new type with the repoview mixin and the given base class"""
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Yuya Nishihara <yuya@tcha.org>
parents: 34649
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270 if base not in _filteredrepotypes:
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Yuya Nishihara <yuya@tcha.org>
parents: 34649
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271 class filteredrepo(repoview, base):
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Yuya Nishihara <yuya@tcha.org>
parents: 34649
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272 pass
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Yuya Nishihara <yuya@tcha.org>
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273 _filteredrepotypes[base] = filteredrepo
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274 return _filteredrepotypes[base]