Mercurial > hg
annotate mercurial/copies.py @ 21107:4a6c8b6b10d3
revlog: backout 514d32de6646 - commonancestors
author | Mads Kiilerich <madski@unity3d.com> |
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date | Thu, 17 Apr 2014 20:01:39 +0200 |
parents | d9e211a658eb |
children | 722117c8e023 |
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1 # copies.py - copy detection for Mercurial |
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2 # |
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3 # Copyright 2008 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 import util |
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9 import heapq |
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10 |
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11 def _nonoverlap(d1, d2, d3): |
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12 "Return list of elements in d1 not in d2 or d3" |
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13 return sorted([d for d in d1 if d not in d3 and d not in d2]) |
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14 |
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15 def _dirname(f): |
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16 s = f.rfind("/") |
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17 if s == -1: |
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18 return "" |
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19 return f[:s] |
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20 |
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21 def _findlimit(repo, a, b): |
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22 """Find the earliest revision that's an ancestor of a or b but not both, |
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23 None if no such revision exists. |
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24 """ |
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25 # basic idea: |
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26 # - mark a and b with different sides |
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27 # - if a parent's children are all on the same side, the parent is |
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28 # on that side, otherwise it is on no side |
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29 # - walk the graph in topological order with the help of a heap; |
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30 # - add unseen parents to side map |
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31 # - clear side of any parent that has children on different sides |
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32 # - track number of interesting revs that might still be on a side |
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33 # - track the lowest interesting rev seen |
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34 # - quit when interesting revs is zero |
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35 |
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36 cl = repo.changelog |
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37 working = len(cl) # pseudo rev for the working directory |
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38 if a is None: |
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39 a = working |
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40 if b is None: |
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41 b = working |
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42 |
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43 side = {a: -1, b: 1} |
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44 visit = [-a, -b] |
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45 heapq.heapify(visit) |
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46 interesting = len(visit) |
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47 hascommonancestor = False |
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48 limit = working |
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49 |
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50 while interesting: |
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51 r = -heapq.heappop(visit) |
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52 if r == working: |
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53 parents = [cl.rev(p) for p in repo.dirstate.parents()] |
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54 else: |
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55 parents = cl.parentrevs(r) |
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56 for p in parents: |
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57 if p < 0: |
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58 continue |
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59 if p not in side: |
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60 # first time we see p; add it to visit |
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61 side[p] = side[r] |
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62 if side[p]: |
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63 interesting += 1 |
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64 heapq.heappush(visit, -p) |
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65 elif side[p] and side[p] != side[r]: |
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66 # p was interesting but now we know better |
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67 side[p] = 0 |
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68 interesting -= 1 |
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69 hascommonancestor = True |
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70 if side[r]: |
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71 limit = r # lowest rev visited |
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72 interesting -= 1 |
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73 |
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74 if not hascommonancestor: |
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75 return None |
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76 return limit |
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77 |
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78 def _chain(src, dst, a, b): |
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79 '''chain two sets of copies a->b''' |
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80 t = a.copy() |
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81 for k, v in b.iteritems(): |
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82 if v in t: |
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83 # found a chain |
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84 if t[v] != k: |
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85 # file wasn't renamed back to itself |
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86 t[k] = t[v] |
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87 if v not in dst: |
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88 # chain was a rename, not a copy |
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89 del t[v] |
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90 if v in src: |
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91 # file is a copy of an existing file |
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92 t[k] = v |
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93 |
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94 # remove criss-crossed copies |
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95 for k, v in t.items(): |
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96 if k in src and v in dst: |
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97 del t[k] |
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98 |
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99 return t |
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100 |
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101 def _tracefile(fctx, am, limit=-1): |
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102 '''return file context that is the ancestor of fctx present in ancestor |
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103 manifest am, stopping after the first ancestor lower than limit''' |
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104 |
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105 for f in fctx.ancestors(): |
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106 if am.get(f.path(), None) == f.filenode(): |
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107 return f |
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108 if f.rev() < limit: |
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109 return None |
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110 |
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111 def _dirstatecopies(d): |
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112 ds = d._repo.dirstate |
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113 c = ds.copies().copy() |
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114 for k in c.keys(): |
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115 if ds[k] not in 'anm': |
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116 del c[k] |
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117 return c |
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118 |
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119 def _forwardcopies(a, b): |
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120 '''find {dst@b: src@a} copy mapping where a is an ancestor of b''' |
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121 |
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122 # check for working copy |
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123 w = None |
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124 if b.rev() is None: |
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125 w = b |
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126 b = w.p1() |
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127 if a == b: |
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128 # short-circuit to avoid issues with merge states |
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129 return _dirstatecopies(w) |
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130 |
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131 # files might have to be traced back to the fctx parent of the last |
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132 # one-side-only changeset, but not further back than that |
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133 limit = _findlimit(a._repo, a.rev(), b.rev()) |
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134 if limit is None: |
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135 limit = -1 |
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136 am = a.manifest() |
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137 |
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138 # find where new files came from |
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139 # we currently don't try to find where old files went, too expensive |
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140 # this means we can miss a case like 'hg rm b; hg cp a b' |
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141 cm = {} |
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142 missing = set(b.manifest().iterkeys()) |
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143 missing.difference_update(a.manifest().iterkeys()) |
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144 |
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145 for f in missing: |
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146 ofctx = _tracefile(b[f], am, limit) |
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147 if ofctx: |
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148 cm[f] = ofctx.path() |
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149 |
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150 # combine copies from dirstate if necessary |
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151 if w is not None: |
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152 cm = _chain(a, w, cm, _dirstatecopies(w)) |
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153 |
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154 return cm |
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155 |
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156 def _backwardrenames(a, b): |
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157 # Even though we're not taking copies into account, 1:n rename situations |
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158 # can still exist (e.g. hg cp a b; hg mv a c). In those cases we |
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159 # arbitrarily pick one of the renames. |
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160 f = _forwardcopies(b, a) |
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161 r = {} |
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162 for k, v in sorted(f.iteritems()): |
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163 # remove copies |
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164 if v in a: |
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165 continue |
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166 r[v] = k |
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167 return r |
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168 |
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169 def pathcopies(x, y): |
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170 '''find {dst@y: src@x} copy mapping for directed compare''' |
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171 if x == y or not x or not y: |
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172 return {} |
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173 a = y.ancestor(x) |
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174 if a == x: |
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175 return _forwardcopies(x, y) |
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176 if a == y: |
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177 return _backwardrenames(x, y) |
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178 return _chain(x, y, _backwardrenames(x, a), _forwardcopies(a, y)) |
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179 |
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180 def mergecopies(repo, c1, c2, ca): |
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181 """ |
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182 Find moves and copies between context c1 and c2 that are relevant |
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183 for merging. |
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184 |
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185 Returns four dicts: "copy", "movewithdir", "diverge", and |
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186 "renamedelete". |
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187 |
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188 "copy" is a mapping from destination name -> source name, |
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189 where source is in c1 and destination is in c2 or vice-versa. |
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190 |
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191 "movewithdir" is a mapping from source name -> destination name, |
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192 where the file at source present in one context but not the other |
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193 needs to be moved to destination by the merge process, because the |
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194 other context moved the directory it is in. |
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195 |
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196 "diverge" is a mapping of source name -> list of destination names |
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197 for divergent renames. |
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198 |
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199 "renamedelete" is a mapping of source name -> list of destination |
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200 names for files deleted in c1 that were renamed in c2 or vice-versa. |
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201 """ |
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202 # avoid silly behavior for update from empty dir |
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203 if not c1 or not c2 or c1 == c2: |
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204 return {}, {}, {}, {} |
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205 |
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206 # avoid silly behavior for parent -> working dir |
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207 if c2.node() is None and c1.node() == repo.dirstate.p1(): |
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208 return repo.dirstate.copies(), {}, {}, {} |
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209 |
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210 limit = _findlimit(repo, c1.rev(), c2.rev()) |
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211 if limit is None: |
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212 # no common ancestor, no copies |
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213 return {}, {}, {}, {} |
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214 m1 = c1.manifest() |
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215 m2 = c2.manifest() |
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216 ma = ca.manifest() |
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217 |
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218 def makectx(f, n): |
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219 if len(n) != 20: # in a working context? |
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220 if c1.rev() is None: |
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221 return c1.filectx(f) |
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222 return c2.filectx(f) |
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223 return repo.filectx(f, fileid=n) |
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224 |
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225 ctx = util.lrucachefunc(makectx) |
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226 copy = {} |
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227 movewithdir = {} |
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228 fullcopy = {} |
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229 diverge = {} |
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230 |
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231 repo.ui.debug(" searching for copies back to rev %d\n" % limit) |
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232 |
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233 u1 = _nonoverlap(m1, m2, ma) |
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234 u2 = _nonoverlap(m2, m1, ma) |
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235 |
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236 if u1: |
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237 repo.ui.debug(" unmatched files in local:\n %s\n" |
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238 % "\n ".join(u1)) |
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239 if u2: |
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240 repo.ui.debug(" unmatched files in other:\n %s\n" |
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241 % "\n ".join(u2)) |
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242 |
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243 for f in u1: |
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244 checkcopies(ctx, f, m1, m2, ca, limit, diverge, copy, fullcopy) |
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245 |
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246 for f in u2: |
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247 checkcopies(ctx, f, m2, m1, ca, limit, diverge, copy, fullcopy) |
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248 |
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249 renamedelete = {} |
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250 renamedelete2 = set() |
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251 diverge2 = set() |
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252 for of, fl in diverge.items(): |
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253 if len(fl) == 1 or of in c1 or of in c2: |
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254 del diverge[of] # not actually divergent, or not a rename |
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255 if of not in c1 and of not in c2: |
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256 # renamed on one side, deleted on the other side, but filter |
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257 # out files that have been renamed and then deleted |
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258 renamedelete[of] = [f for f in fl if f in c1 or f in c2] |
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259 renamedelete2.update(fl) # reverse map for below |
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260 else: |
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261 diverge2.update(fl) # reverse map for below |
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262 |
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263 bothnew = sorted([d for d in m1 if d in m2 and d not in ma]) |
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264 if bothnew: |
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265 repo.ui.debug(" unmatched files new in both:\n %s\n" |
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266 % "\n ".join(bothnew)) |
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267 bothdiverge, _copy, _fullcopy = {}, {}, {} |
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268 for f in bothnew: |
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269 checkcopies(ctx, f, m1, m2, ca, limit, bothdiverge, _copy, _fullcopy) |
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270 checkcopies(ctx, f, m2, m1, ca, limit, bothdiverge, _copy, _fullcopy) |
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271 for of, fl in bothdiverge.items(): |
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272 if len(fl) == 2 and fl[0] == fl[1]: |
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273 copy[fl[0]] = of # not actually divergent, just matching renames |
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274 |
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275 if fullcopy and repo.ui.debugflag: |
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276 repo.ui.debug(" all copies found (* = to merge, ! = divergent, " |
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277 "% = renamed and deleted):\n") |
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278 for f in sorted(fullcopy): |
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279 note = "" |
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280 if f in copy: |
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281 note += "*" |
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282 if f in diverge2: |
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283 note += "!" |
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284 if f in renamedelete2: |
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285 note += "%" |
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286 repo.ui.debug(" src: '%s' -> dst: '%s' %s\n" % (fullcopy[f], f, |
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287 note)) |
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288 del diverge2 |
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289 |
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290 if not fullcopy: |
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291 return copy, movewithdir, diverge, renamedelete |
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292 |
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293 repo.ui.debug(" checking for directory renames\n") |
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294 |
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295 # generate a directory move map |
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296 d1, d2 = c1.dirs(), c2.dirs() |
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297 d1.addpath('/') |
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298 d2.addpath('/') |
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299 invalid = set() |
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300 dirmove = {} |
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301 |
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302 # examine each file copy for a potential directory move, which is |
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303 # when all the files in a directory are moved to a new directory |
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304 for dst, src in fullcopy.iteritems(): |
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305 dsrc, ddst = _dirname(src), _dirname(dst) |
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306 if dsrc in invalid: |
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307 # already seen to be uninteresting |
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308 continue |
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309 elif dsrc in d1 and ddst in d1: |
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310 # directory wasn't entirely moved locally |
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311 invalid.add(dsrc) |
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312 elif dsrc in d2 and ddst in d2: |
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313 # directory wasn't entirely moved remotely |
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314 invalid.add(dsrc) |
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315 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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316 # files from the same directory moved to two different places |
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317 invalid.add(dsrc) |
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318 else: |
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319 # looks good so far |
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320 dirmove[dsrc + "/"] = ddst + "/" |
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321 |
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322 for i in invalid: |
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323 if i in dirmove: |
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324 del dirmove[i] |
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325 del d1, d2, invalid |
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326 |
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327 if not dirmove: |
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328 return copy, movewithdir, diverge, renamedelete |
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329 |
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330 for d in dirmove: |
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331 repo.ui.debug(" discovered dir src: '%s' -> dst: '%s'\n" % |
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332 (d, dirmove[d])) |
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333 |
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334 # check unaccounted nonoverlapping files against directory moves |
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335 for f in u1 + u2: |
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336 if f not in fullcopy: |
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337 for d in dirmove: |
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338 if f.startswith(d): |
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339 # new file added in a directory that was moved, move it |
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340 df = dirmove[d] + f[len(d):] |
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341 if df not in copy: |
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342 movewithdir[f] = df |
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343 repo.ui.debug((" pending file src: '%s' -> " |
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344 "dst: '%s'\n") % (f, df)) |
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345 break |
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346 |
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347 return copy, movewithdir, diverge, renamedelete |
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348 |
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349 def checkcopies(ctx, f, m1, m2, ca, limit, diverge, copy, fullcopy): |
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350 """ |
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351 check possible copies of f from m1 to m2 |
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352 |
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353 ctx = function accepting (filename, node) that returns a filectx. |
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354 f = the filename to check |
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355 m1 = the source manifest |
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356 m2 = the destination manifest |
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357 ca = the changectx of the common ancestor |
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358 limit = the rev number to not search beyond |
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359 diverge = record all diverges in this dict |
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360 copy = record all non-divergent copies in this dict |
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361 fullcopy = record all copies in this dict |
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362 """ |
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363 |
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364 ma = ca.manifest() |
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365 |
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366 def _related(f1, f2, limit): |
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367 # Walk back to common ancestor to see if the two files originate |
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368 # from the same file. Since workingfilectx's rev() is None it messes |
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369 # up the integer comparison logic, hence the pre-step check for |
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370 # None (f1 and f2 can only be workingfilectx's initially). |
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371 |
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372 if f1 == f2: |
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373 return f1 # a match |
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374 |
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375 g1, g2 = f1.ancestors(), f2.ancestors() |
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376 try: |
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377 f1r, f2r = f1.rev(), f2.rev() |
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378 |
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379 if f1r is None: |
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380 f1 = g1.next() |
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381 if f2r is None: |
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382 f2 = g2.next() |
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383 |
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384 while True: |
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385 f1r, f2r = f1.rev(), f2.rev() |
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386 if f1r > f2r: |
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387 f1 = g1.next() |
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388 elif f2r > f1r: |
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389 f2 = g2.next() |
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390 elif f1 == f2: |
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391 return f1 # a match |
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392 elif f1r == f2r or f1r < limit or f2r < limit: |
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393 return False # copy no longer relevant |
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394 except StopIteration: |
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395 return False |
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396 |
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397 of = None |
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398 seen = set([f]) |
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399 for oc in ctx(f, m1[f]).ancestors(): |
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400 ocr = oc.rev() |
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401 of = oc.path() |
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402 if of in seen: |
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403 # check limit late - grab last rename before |
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404 if ocr < limit: |
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405 break |
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406 continue |
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407 seen.add(of) |
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408 |
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409 fullcopy[f] = of # remember for dir rename detection |
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410 if of not in m2: |
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411 continue # no match, keep looking |
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412 if m2[of] == ma.get(of): |
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413 break # no merge needed, quit early |
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414 c2 = ctx(of, m2[of]) |
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415 cr = _related(oc, c2, ca.rev()) |
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416 if cr and (of == f or of == c2.path()): # non-divergent |
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417 copy[f] = of |
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418 of = None |
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419 break |
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420 |
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421 if of in ma: |
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422 diverge.setdefault(of, []).append(f) |