Mercurial > hg
annotate mercurial/copies.py @ 12025:2315a95ee887
mdiff.patch(): add a special case for when the base text is empty
remove the special casing from revlog.addgroup()
author | Benoit Boissinot <benoit.boissinot@ens-lyon.org> |
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date | Mon, 23 Aug 2010 13:28:04 +0200 |
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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 _dirs(files): |
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22 d = set() |
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23 for f in files: |
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24 f = _dirname(f) |
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25 while f not in d: |
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26 d.add(f) |
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27 f = _dirname(f) |
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28 return d |
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29 |
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30 def _findlimit(repo, a, b): |
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31 """Find the earliest revision that's an ancestor of a or b but not both, |
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32 None if no such revision exists. |
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33 """ |
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34 # basic idea: |
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35 # - mark a and b with different sides |
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36 # - if a parent's children are all on the same side, the parent is |
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37 # on that side, otherwise it is on no side |
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38 # - walk the graph in topological order with the help of a heap; |
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39 # - add unseen parents to side map |
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40 # - clear side of any parent that has children on different sides |
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41 # - track number of interesting revs that might still be on a side |
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42 # - track the lowest interesting rev seen |
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43 # - quit when interesting revs is zero |
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44 |
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45 cl = repo.changelog |
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46 working = len(cl) # pseudo rev for the working directory |
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47 if a is None: |
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48 a = working |
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49 if b is None: |
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50 b = working |
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51 |
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52 side = {a: -1, b: 1} |
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53 visit = [-a, -b] |
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54 heapq.heapify(visit) |
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55 interesting = len(visit) |
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56 hascommonancestor = False |
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57 limit = working |
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58 |
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59 while interesting: |
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60 r = -heapq.heappop(visit) |
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61 if r == working: |
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62 parents = [cl.rev(p) for p in repo.dirstate.parents()] |
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63 else: |
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64 parents = cl.parentrevs(r) |
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65 for p in parents: |
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66 if p < 0: |
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67 continue |
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68 if p not in side: |
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69 # first time we see p; add it to visit |
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70 side[p] = side[r] |
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71 if side[p]: |
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72 interesting += 1 |
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73 heapq.heappush(visit, -p) |
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74 elif side[p] and side[p] != side[r]: |
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75 # p was interesting but now we know better |
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76 side[p] = 0 |
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77 interesting -= 1 |
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78 hascommonancestor = True |
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79 if side[r]: |
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80 limit = r # lowest rev visited |
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81 interesting -= 1 |
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82 |
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83 if not hascommonancestor: |
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84 return None |
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85 return limit |
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86 |
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87 def copies(repo, c1, c2, ca, checkdirs=False): |
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88 """ |
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89 Find moves and copies between context c1 and c2 |
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90 """ |
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91 # avoid silly behavior for update from empty dir |
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92 if not c1 or not c2 or c1 == c2: |
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93 return {}, {} |
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94 |
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95 # avoid silly behavior for parent -> working dir |
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96 if c2.node() is None and c1.node() == repo.dirstate.parents()[0]: |
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97 return repo.dirstate.copies(), {} |
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98 |
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99 limit = _findlimit(repo, c1.rev(), c2.rev()) |
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100 if limit is None: |
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101 # no common ancestor, no copies |
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102 return {}, {} |
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103 m1 = c1.manifest() |
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104 m2 = c2.manifest() |
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105 ma = ca.manifest() |
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106 |
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107 def makectx(f, n): |
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108 if len(n) != 20: # in a working context? |
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109 if c1.rev() is None: |
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110 return c1.filectx(f) |
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111 return c2.filectx(f) |
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112 return repo.filectx(f, fileid=n) |
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113 |
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114 ctx = util.lrucachefunc(makectx) |
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115 copy = {} |
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116 fullcopy = {} |
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117 diverge = {} |
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118 |
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119 def related(f1, f2, limit): |
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120 # Walk back to common ancestor to see if the two files originate |
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121 # from the same file. Since workingfilectx's rev() is None it messes |
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122 # up the integer comparison logic, hence the pre-step check for |
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123 # None (f1 and f2 can only be workingfilectx's initially). |
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124 |
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125 if f1 == f2: |
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126 return f1 # a match |
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127 |
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128 g1, g2 = f1.ancestors(), f2.ancestors() |
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129 try: |
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130 f1r, f2r = f1.rev(), f2.rev() |
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131 |
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132 if f1r is None: |
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133 f1 = g1.next() |
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134 if f2r is None: |
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135 f2 = g2.next() |
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136 |
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137 while 1: |
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138 f1r, f2r = f1.rev(), f2.rev() |
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139 if f1r > f2r: |
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140 f1 = g1.next() |
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141 elif f2r > f1r: |
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142 f2 = g2.next() |
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143 elif f1 == f2: |
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144 return f1 # a match |
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145 elif f1r == f2r or f1r < limit or f2r < limit: |
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146 return False # copy no longer relevant |
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147 except StopIteration: |
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148 return False |
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149 |
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150 def checkcopies(f, m1, m2): |
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151 '''check possible copies of f from m1 to m2''' |
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152 of = None |
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153 seen = set([f]) |
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154 for oc in ctx(f, m1[f]).ancestors(): |
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155 ocr = oc.rev() |
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156 of = oc.path() |
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157 if of in seen: |
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158 # check limit late - grab last rename before |
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159 if ocr < limit: |
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160 break |
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161 continue |
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162 seen.add(of) |
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163 |
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164 fullcopy[f] = of # remember for dir rename detection |
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165 if of not in m2: |
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166 continue # no match, keep looking |
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167 if m2[of] == ma.get(of): |
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168 break # no merge needed, quit early |
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169 c2 = ctx(of, m2[of]) |
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170 cr = related(oc, c2, ca.rev()) |
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171 if cr and (of == f or of == c2.path()): # non-divergent |
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172 copy[f] = of |
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173 of = None |
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174 break |
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175 |
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176 if of in ma: |
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177 diverge.setdefault(of, []).append(f) |
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178 |
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179 repo.ui.debug(" searching for copies back to rev %d\n" % limit) |
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180 |
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181 u1 = _nonoverlap(m1, m2, ma) |
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182 u2 = _nonoverlap(m2, m1, ma) |
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183 |
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184 if u1: |
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185 repo.ui.debug(" unmatched files in local:\n %s\n" |
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186 % "\n ".join(u1)) |
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187 if u2: |
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188 repo.ui.debug(" unmatched files in other:\n %s\n" |
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189 % "\n ".join(u2)) |
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190 |
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191 for f in u1: |
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192 checkcopies(f, m1, m2) |
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193 for f in u2: |
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194 checkcopies(f, m2, m1) |
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195 |
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196 diverge2 = set() |
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197 for of, fl in diverge.items(): |
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198 if len(fl) == 1: |
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199 del diverge[of] # not actually divergent |
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200 else: |
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201 diverge2.update(fl) # reverse map for below |
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202 |
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203 if fullcopy: |
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204 repo.ui.debug(" all copies found (* = to merge, ! = divergent):\n") |
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205 for f in fullcopy: |
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206 note = "" |
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207 if f in copy: |
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208 note += "*" |
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209 if f in diverge2: |
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210 note += "!" |
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211 repo.ui.debug(" %s -> %s %s\n" % (f, fullcopy[f], note)) |
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212 del diverge2 |
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213 |
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214 if not fullcopy or not checkdirs: |
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215 return copy, diverge |
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216 |
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217 repo.ui.debug(" checking for directory renames\n") |
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218 |
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219 # generate a directory move map |
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220 d1, d2 = _dirs(m1), _dirs(m2) |
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221 invalid = set() |
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222 dirmove = {} |
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223 |
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224 # examine each file copy for a potential directory move, which is |
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225 # when all the files in a directory are moved to a new directory |
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226 for dst, src in fullcopy.iteritems(): |
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227 dsrc, ddst = _dirname(src), _dirname(dst) |
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228 if dsrc in invalid: |
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229 # already seen to be uninteresting |
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230 continue |
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231 elif dsrc in d1 and ddst in d1: |
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232 # directory wasn't entirely moved locally |
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233 invalid.add(dsrc) |
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234 elif dsrc in d2 and ddst in d2: |
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235 # directory wasn't entirely moved remotely |
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236 invalid.add(dsrc) |
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237 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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238 # files from the same directory moved to two different places |
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239 invalid.add(dsrc) |
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240 else: |
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241 # looks good so far |
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242 dirmove[dsrc + "/"] = ddst + "/" |
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243 |
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244 for i in invalid: |
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245 if i in dirmove: |
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246 del dirmove[i] |
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247 del d1, d2, invalid |
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248 |
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249 if not dirmove: |
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250 return copy, diverge |
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251 |
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252 for d in dirmove: |
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253 repo.ui.debug(" dir %s -> %s\n" % (d, dirmove[d])) |
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254 |
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255 # check unaccounted nonoverlapping files against directory moves |
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256 for f in u1 + u2: |
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257 if f not in fullcopy: |
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258 for d in dirmove: |
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259 if f.startswith(d): |
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260 # new file added in a directory that was moved, move it |
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261 df = dirmove[d] + f[len(d):] |
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262 if df not in copy: |
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263 copy[f] = df |
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264 repo.ui.debug(" file %s -> %s\n" % (f, copy[f])) |
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265 break |
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266 |
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267 return copy, diverge |