Mercurial > hg
annotate mercurial/repoview.py @ 33451:e44d54260c32
phases: track phase movements in 'advanceboundary'
Makes advanceboundary record the phase movement of affected revisions in
tr.changes['phases'].
The tracking is not usable yet because the 'retractboundary' function can also
affect phases.
We'll improve that in the coming changesets.
author | Boris Feld <boris.feld@octobus.net> |
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date | Tue, 11 Jul 2017 02:39:52 +0200 |
parents | 48d1e1214d8c |
children | 586645e0589c |
rev | line source |
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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 |
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13 from .node import nullrev |
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14 from . import ( |
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15 obsolete, |
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16 phases, |
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17 tags as tagsmod, |
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18 ) |
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19 |
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20 def hideablerevs(repo): |
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21 """Revision candidates to be hidden |
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22 |
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23 This is a standalone function to allow extensions to wrap it. |
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24 |
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25 Because we use the set of immutable changesets as a fallback subset in |
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26 branchmap (see mercurial.branchmap.subsettable), you cannot set "public" |
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27 changesets as "hideable". Doing so would break multiple code assertions and |
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28 lead to crashes.""" |
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29 return obsolete.getrevs(repo, 'obsolete') |
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30 |
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31 def pinnedrevs(repo): |
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32 """revisions blocking hidden changesets from being filtered |
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33 """ |
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34 |
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35 cl = repo.changelog |
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36 pinned = set() |
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37 pinned.update([par.rev() for par in repo[None].parents()]) |
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38 pinned.update([cl.rev(bm) for bm in repo._bookmarks.values()]) |
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39 |
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40 tags = {} |
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41 tagsmod.readlocaltags(repo.ui, repo, tags, {}) |
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42 if tags: |
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43 rev, nodemap = cl.rev, cl.nodemap |
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44 pinned.update(rev(t[0]) for t in tags.values() if t[0] in nodemap) |
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45 return pinned |
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46 |
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47 |
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48 def _revealancestors(pfunc, hidden, revs): |
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49 """reveals contiguous chains of hidden ancestors of 'revs' by removing them |
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50 from 'hidden' |
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51 |
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52 - pfunc(r): a funtion returning parent of 'r', |
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53 - hidden: the (preliminary) hidden revisions, to be updated |
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54 - revs: iterable of revnum, |
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55 |
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56 (Ancestors are revealed exclusively, i.e. the elements in 'revs' are |
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57 *not* revealed) |
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58 """ |
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59 stack = list(revs) |
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60 while stack: |
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61 for p in pfunc(stack.pop()): |
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62 if p != nullrev and p in hidden: |
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63 hidden.remove(p) |
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64 stack.append(p) |
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65 |
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66 def computehidden(repo): |
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67 """compute the set of hidden revision to filter |
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68 |
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69 During most operation hidden should be filtered.""" |
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70 assert not repo.changelog.filteredrevs |
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71 |
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72 hidden = hideablerevs(repo) |
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73 if hidden: |
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74 hidden = set(hidden - pinnedrevs(repo)) |
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75 pfunc = repo.changelog.parentrevs |
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76 mutablephases = (phases.draft, phases.secret) |
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77 mutable = repo._phasecache.getrevset(repo, mutablephases) |
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78 |
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79 visible = mutable - hidden |
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80 _revealancestors(pfunc, hidden, visible) |
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81 return frozenset(hidden) |
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82 |
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83 def computeunserved(repo): |
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84 """compute the set of revision that should be filtered when used a server |
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85 |
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86 Secret and hidden changeset should not pretend to be here.""" |
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87 assert not repo.changelog.filteredrevs |
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88 # fast path in simple case to avoid impact of non optimised code |
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89 hiddens = filterrevs(repo, 'visible') |
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90 if phases.hassecret(repo): |
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91 cl = repo.changelog |
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92 secret = phases.secret |
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93 getphase = repo._phasecache.phase |
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94 first = min(cl.rev(n) for n in repo._phasecache.phaseroots[secret]) |
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95 revs = cl.revs(start=first) |
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96 secrets = set(r for r in revs if getphase(repo, r) >= secret) |
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97 return frozenset(hiddens | secrets) |
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98 else: |
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99 return hiddens |
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100 |
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101 def computemutable(repo): |
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102 """compute the set of revision that should be filtered when used a server |
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103 |
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104 Secret and hidden changeset should not pretend to be here.""" |
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105 assert not repo.changelog.filteredrevs |
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106 # fast check to avoid revset call on huge repo |
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107 if any(repo._phasecache.phaseroots[1:]): |
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108 getphase = repo._phasecache.phase |
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109 maymutable = filterrevs(repo, 'base') |
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110 return frozenset(r for r in maymutable if getphase(repo, r)) |
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111 return frozenset() |
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112 |
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113 def computeimpactable(repo): |
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114 """Everything impactable by mutable revision |
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115 |
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116 The immutable filter still have some chance to get invalidated. This will |
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117 happen when: |
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118 |
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119 - you garbage collect hidden changeset, |
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120 - public phase is moved backward, |
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121 - something is changed in the filtering (this could be fixed) |
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122 |
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123 This filter out any mutable changeset and any public changeset that may be |
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124 impacted by something happening to a mutable revision. |
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125 |
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126 This is achieved by filtered everything with a revision number egal or |
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127 higher than the first mutable changeset is filtered.""" |
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128 assert not repo.changelog.filteredrevs |
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129 cl = repo.changelog |
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130 firstmutable = len(cl) |
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131 for roots in repo._phasecache.phaseroots[1:]: |
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132 if roots: |
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133 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots)) |
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134 # protect from nullrev root |
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135 firstmutable = max(0, firstmutable) |
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136 return frozenset(xrange(firstmutable, len(cl))) |
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137 |
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138 # function to compute filtered set |
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139 # |
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140 # When adding a new filter you MUST update the table at: |
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141 # mercurial.branchmap.subsettable |
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142 # Otherwise your filter will have to recompute all its branches cache |
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143 # from scratch (very slow). |
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144 filtertable = {'visible': computehidden, |
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145 'served': computeunserved, |
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146 'immutable': computemutable, |
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147 'base': computeimpactable} |
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148 |
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149 def filterrevs(repo, filtername): |
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150 """returns set of filtered revision for this filter name""" |
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151 if filtername not in repo.filteredrevcache: |
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152 func = filtertable[filtername] |
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153 repo.filteredrevcache[filtername] = func(repo.unfiltered()) |
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154 return repo.filteredrevcache[filtername] |
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155 |
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156 class repoview(object): |
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157 """Provide a read/write view of a repo through a filtered changelog |
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158 |
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159 This object is used to access a filtered version of a repository without |
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160 altering the original repository object itself. We can not alter the |
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161 original object for two main reasons: |
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162 - It prevents the use of a repo with multiple filters at the same time. In |
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163 particular when multiple threads are involved. |
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164 - It makes scope of the filtering harder to control. |
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165 |
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166 This object behaves very closely to the original repository. All attribute |
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167 operations are done on the original repository: |
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168 - An access to `repoview.someattr` actually returns `repo.someattr`, |
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169 - A write to `repoview.someattr` actually sets value of `repo.someattr`, |
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170 - A deletion of `repoview.someattr` actually drops `someattr` |
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171 from `repo.__dict__`. |
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172 |
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173 The only exception is the `changelog` property. It is overridden to return |
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174 a (surface) copy of `repo.changelog` with some revisions filtered. The |
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175 `filtername` attribute of the view control the revisions that need to be |
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176 filtered. (the fact the changelog is copied is an implementation detail). |
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177 |
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178 Unlike attributes, this object intercepts all method calls. This means that |
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179 all methods are run on the `repoview` object with the filtered `changelog` |
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180 property. For this purpose the simple `repoview` class must be mixed with |
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181 the actual class of the repository. This ensures that the resulting |
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182 `repoview` object have the very same methods than the repo object. This |
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183 leads to the property below. |
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184 |
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185 repoview.method() --> repo.__class__.method(repoview) |
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186 |
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187 The inheritance has to be done dynamically because `repo` can be of any |
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188 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`. |
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189 """ |
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190 |
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191 def __init__(self, repo, filtername): |
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192 object.__setattr__(self, r'_unfilteredrepo', repo) |
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193 object.__setattr__(self, r'filtername', filtername) |
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194 object.__setattr__(self, r'_clcachekey', None) |
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195 object.__setattr__(self, r'_clcache', None) |
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196 |
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197 # not a propertycache on purpose we shall implement a proper cache later |
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198 @property |
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199 def changelog(self): |
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200 """return a filtered version of the changeset |
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201 |
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202 this changelog must not be used for writing""" |
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203 # some cache may be implemented later |
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204 unfi = self._unfilteredrepo |
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205 unfichangelog = unfi.changelog |
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206 # bypass call to changelog.method |
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207 unfiindex = unfichangelog.index |
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208 unfilen = len(unfiindex) - 1 |
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209 unfinode = unfiindex[unfilen - 1][7] |
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210 |
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211 revs = filterrevs(unfi, self.filtername) |
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212 cl = self._clcache |
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213 newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed) |
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214 # if cl.index is not unfiindex, unfi.changelog would be |
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215 # recreated, and our clcache refers to garbage object |
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216 if (cl is not None and |
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217 (cl.index is not unfiindex or newkey != self._clcachekey)): |
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218 cl = None |
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219 # could have been made None by the previous if |
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220 if cl is None: |
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221 cl = copy.copy(unfichangelog) |
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222 cl.filteredrevs = revs |
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223 object.__setattr__(self, r'_clcache', cl) |
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224 object.__setattr__(self, r'_clcachekey', newkey) |
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225 return cl |
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226 |
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227 def unfiltered(self): |
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228 """Return an unfiltered version of a repo""" |
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229 return self._unfilteredrepo |
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230 |
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231 def filtered(self, name): |
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232 """Return a filtered version of a repository""" |
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233 if name == self.filtername: |
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234 return self |
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235 return self.unfiltered().filtered(name) |
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236 |
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237 # everything access are forwarded to the proxied repo |
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238 def __getattr__(self, attr): |
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239 return getattr(self._unfilteredrepo, attr) |
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240 |
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241 def __setattr__(self, attr, value): |
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242 return setattr(self._unfilteredrepo, attr, value) |
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243 |
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244 def __delattr__(self, attr): |
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245 return delattr(self._unfilteredrepo, attr) |