Mercurial > hg
annotate mercurial/copies.py @ 16239:287f76b3f502
hgweb: support multi-level repository indexes by enabling descend and collapse
The descend option in hgweb can be used to display all reachable repositories
within a directory hierarchy if set to True. However, all reachable
repositories, regardless of their depth below the root of the hierarchy, are
then listed at the same level - expanded - in the hgweb interface. This patch
adds support for showing only each level of a directory hierarchy, with
subrepositories being shown alongside their parent repositories only at the
appropriate level (because there is no way to navigate to subrepositories from
within repositories), and the contents of directories hidden - collapsed -
behind a link for each directory. To enable this multi-level navigation, a new
option called collapse must be set to True when the descend option is set to
True.
author | Paul Boddie <paul@boddie.org.uk> |
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date | Sat, 18 Feb 2012 20:10:19 +0100 |
parents | 828fe2ca7cbb |
children | ad394c897b16 |
rev | line source |
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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, actx): |
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102 '''return file context that is the ancestor of fctx present in actx''' |
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103 stop = actx.rev() |
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104 am = actx.manifest() |
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105 |
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106 for f in fctx.ancestors(): |
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107 if am.get(f.path(), None) == f.filenode(): |
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108 return f |
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109 if f.rev() < stop: |
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110 return None |
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111 |
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112 def _dirstatecopies(d): |
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113 ds = d._repo.dirstate |
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114 c = ds.copies().copy() |
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115 for k in c.keys(): |
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116 if ds[k] not in 'anm': |
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117 del c[k] |
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118 return c |
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119 |
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120 def _forwardcopies(a, b): |
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121 '''find {dst@b: src@a} copy mapping where a is an ancestor of b''' |
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122 |
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123 # check for working copy |
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124 w = None |
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125 if b.rev() is None: |
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126 w = b |
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127 b = w.p1() |
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128 if a == b: |
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129 # short-circuit to avoid issues with merge states |
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130 return _dirstatecopies(w) |
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131 |
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132 # find where new files came from |
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133 # we currently don't try to find where old files went, too expensive |
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134 # this means we can miss a case like 'hg rm b; hg cp a b' |
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135 cm = {} |
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136 for f in b: |
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137 if f not in a: |
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138 ofctx = _tracefile(b[f], a) |
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139 if ofctx: |
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140 cm[f] = ofctx.path() |
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141 |
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142 # combine copies from dirstate if necessary |
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143 if w is not None: |
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144 cm = _chain(a, w, cm, _dirstatecopies(w)) |
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145 |
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146 return cm |
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147 |
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148 def _backwardcopies(a, b): |
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149 # because the forward mapping is 1:n, we can lose renames here |
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150 # in particular, we find renames better than copies |
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151 f = _forwardcopies(b, a) |
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152 r = {} |
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153 for k, v in f.iteritems(): |
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154 r[v] = k |
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155 return r |
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156 |
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157 def pathcopies(x, y): |
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158 '''find {dst@y: src@x} copy mapping for directed compare''' |
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159 if x == y or not x or not y: |
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160 return {} |
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161 a = y.ancestor(x) |
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162 if a == x: |
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163 return _forwardcopies(x, y) |
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164 if a == y: |
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165 return _backwardcopies(x, y) |
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166 return _chain(x, y, _backwardcopies(x, a), _forwardcopies(a, y)) |
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167 |
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168 def mergecopies(repo, c1, c2, ca): |
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169 """ |
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170 Find moves and copies between context c1 and c2 that are relevant |
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171 for merging. |
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172 |
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173 Returns two dicts, "copy" and "diverge". |
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174 |
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175 "copy" is a mapping from destination name -> source name, |
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176 where source is in c1 and destination is in c2 or vice-versa. |
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177 |
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178 "diverge" is a mapping of source name -> list of destination names |
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179 for divergent renames. |
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180 """ |
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181 # avoid silly behavior for update from empty dir |
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182 if not c1 or not c2 or c1 == c2: |
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183 return {}, {} |
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184 |
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185 # avoid silly behavior for parent -> working dir |
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186 if c2.node() is None and c1.node() == repo.dirstate.p1(): |
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187 return repo.dirstate.copies(), {} |
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188 |
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189 limit = _findlimit(repo, c1.rev(), c2.rev()) |
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190 if limit is None: |
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191 # no common ancestor, no copies |
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192 return {}, {} |
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193 m1 = c1.manifest() |
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194 m2 = c2.manifest() |
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195 ma = ca.manifest() |
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196 |
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197 def makectx(f, n): |
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198 if len(n) != 20: # in a working context? |
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199 if c1.rev() is None: |
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200 return c1.filectx(f) |
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201 return c2.filectx(f) |
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202 return repo.filectx(f, fileid=n) |
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203 |
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204 ctx = util.lrucachefunc(makectx) |
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205 copy = {} |
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206 fullcopy = {} |
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207 diverge = {} |
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208 |
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209 def related(f1, f2, limit): |
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210 # Walk back to common ancestor to see if the two files originate |
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211 # from the same file. Since workingfilectx's rev() is None it messes |
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212 # up the integer comparison logic, hence the pre-step check for |
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213 # None (f1 and f2 can only be workingfilectx's initially). |
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214 |
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215 if f1 == f2: |
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216 return f1 # a match |
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217 |
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218 g1, g2 = f1.ancestors(), f2.ancestors() |
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219 try: |
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220 f1r, f2r = f1.rev(), f2.rev() |
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221 |
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222 if f1r is None: |
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223 f1 = g1.next() |
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224 if f2r is None: |
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225 f2 = g2.next() |
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226 |
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227 while True: |
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228 f1r, f2r = f1.rev(), f2.rev() |
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229 if f1r > f2r: |
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230 f1 = g1.next() |
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231 elif f2r > f1r: |
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232 f2 = g2.next() |
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233 elif f1 == f2: |
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234 return f1 # a match |
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235 elif f1r == f2r or f1r < limit or f2r < limit: |
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236 return False # copy no longer relevant |
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237 except StopIteration: |
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238 return False |
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239 |
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240 def checkcopies(f, m1, m2): |
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241 '''check possible copies of f from m1 to m2''' |
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242 of = None |
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243 seen = set([f]) |
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244 for oc in ctx(f, m1[f]).ancestors(): |
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245 ocr = oc.rev() |
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246 of = oc.path() |
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247 if of in seen: |
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248 # check limit late - grab last rename before |
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249 if ocr < limit: |
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250 break |
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251 continue |
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252 seen.add(of) |
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253 |
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254 fullcopy[f] = of # remember for dir rename detection |
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255 if of not in m2: |
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256 continue # no match, keep looking |
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257 if m2[of] == ma.get(of): |
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258 break # no merge needed, quit early |
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259 c2 = ctx(of, m2[of]) |
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260 cr = related(oc, c2, ca.rev()) |
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261 if cr and (of == f or of == c2.path()): # non-divergent |
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262 copy[f] = of |
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263 of = None |
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264 break |
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265 |
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266 if of in ma: |
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267 diverge.setdefault(of, []).append(f) |
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268 |
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269 repo.ui.debug(" searching for copies back to rev %d\n" % limit) |
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270 |
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271 u1 = _nonoverlap(m1, m2, ma) |
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272 u2 = _nonoverlap(m2, m1, ma) |
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273 |
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274 if u1: |
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275 repo.ui.debug(" unmatched files in local:\n %s\n" |
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276 % "\n ".join(u1)) |
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277 if u2: |
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278 repo.ui.debug(" unmatched files in other:\n %s\n" |
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279 % "\n ".join(u2)) |
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280 |
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281 for f in u1: |
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282 checkcopies(f, m1, m2) |
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283 for f in u2: |
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284 checkcopies(f, m2, m1) |
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285 |
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286 diverge2 = set() |
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287 for of, fl in diverge.items(): |
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288 if len(fl) == 1 or of in c2: |
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289 del diverge[of] # not actually divergent, or not a rename |
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290 else: |
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291 diverge2.update(fl) # reverse map for below |
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292 |
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293 if fullcopy: |
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294 repo.ui.debug(" all copies found (* = to merge, ! = divergent):\n") |
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295 for f in fullcopy: |
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296 note = "" |
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297 if f in copy: |
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298 note += "*" |
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299 if f in diverge2: |
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300 note += "!" |
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301 repo.ui.debug(" %s -> %s %s\n" % (f, fullcopy[f], note)) |
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302 del diverge2 |
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303 |
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304 if not fullcopy: |
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305 return copy, diverge |
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306 |
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307 repo.ui.debug(" checking for directory renames\n") |
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308 |
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309 # generate a directory move map |
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310 d1, d2 = c1.dirs(), c2.dirs() |
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311 invalid = set([""]) |
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312 dirmove = {} |
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313 |
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314 # examine each file copy for a potential directory move, which is |
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315 # when all the files in a directory are moved to a new directory |
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316 for dst, src in fullcopy.iteritems(): |
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317 dsrc, ddst = _dirname(src), _dirname(dst) |
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318 if dsrc in invalid: |
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319 # already seen to be uninteresting |
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320 continue |
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321 elif dsrc in d1 and ddst in d1: |
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322 # directory wasn't entirely moved locally |
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323 invalid.add(dsrc) |
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324 elif dsrc in d2 and ddst in d2: |
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325 # directory wasn't entirely moved remotely |
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326 invalid.add(dsrc) |
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327 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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328 # files from the same directory moved to two different places |
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329 invalid.add(dsrc) |
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330 else: |
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331 # looks good so far |
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332 dirmove[dsrc + "/"] = ddst + "/" |
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333 |
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334 for i in invalid: |
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335 if i in dirmove: |
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336 del dirmove[i] |
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337 del d1, d2, invalid |
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338 |
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339 if not dirmove: |
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340 return copy, diverge |
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341 |
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342 for d in dirmove: |
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343 repo.ui.debug(" dir %s -> %s\n" % (d, dirmove[d])) |
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344 |
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345 # check unaccounted nonoverlapping files against directory moves |
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346 for f in u1 + u2: |
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347 if f not in fullcopy: |
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348 for d in dirmove: |
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349 if f.startswith(d): |
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350 # new file added in a directory that was moved, move it |
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351 df = dirmove[d] + f[len(d):] |
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352 if df not in copy: |
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353 copy[f] = df |
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354 repo.ui.debug(" file %s -> %s\n" % (f, copy[f])) |
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355 break |
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356 |
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357 return copy, diverge |