author | Nishanth Amuluru <nishanth@fossee.in> |
Sun, 09 Jan 2011 11:13:36 +0530 | |
changeset 114 | 1a88b04adb39 |
parent 69 | c6bca38c1cbf |
permissions | -rw-r--r-- |
69
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1 |
# copies.py - copy detection for Mercurial |
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# |
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# Copyright 2008 Matt Mackall <mpm@selenic.com> |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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|
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import util |
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import heapq |
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|
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def _nonoverlap(d1, d2, d3): |
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"Return list of elements in d1 not in d2 or d3" |
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return sorted([d for d in d1 if d not in d3 and d not in d2]) |
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|
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def _dirname(f): |
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s = f.rfind("/") |
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if s == -1: |
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return "" |
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return f[:s] |
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|
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def _dirs(files): |
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d = set() |
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for f in files: |
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f = _dirname(f) |
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while f not in d: |
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d.add(f) |
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f = _dirname(f) |
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return d |
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|
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def _findlimit(repo, a, b): |
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"""Find the earliest revision that's an ancestor of a or b but not both, |
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None if no such revision exists. |
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""" |
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# basic idea: |
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# - mark a and b with different sides |
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# - if a parent's children are all on the same side, the parent is |
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# on that side, otherwise it is on no side |
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# - walk the graph in topological order with the help of a heap; |
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# - add unseen parents to side map |
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# - clear side of any parent that has children on different sides |
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# - track number of interesting revs that might still be on a side |
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# - track the lowest interesting rev seen |
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# - quit when interesting revs is zero |
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|
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cl = repo.changelog |
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working = len(cl) # pseudo rev for the working directory |
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if a is None: |
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a = working |
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if b is None: |
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b = working |
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|
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side = {a: -1, b: 1} |
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visit = [-a, -b] |
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heapq.heapify(visit) |
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interesting = len(visit) |
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hascommonancestor = False |
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limit = working |
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|
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while interesting: |
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r = -heapq.heappop(visit) |
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if r == working: |
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parents = [cl.rev(p) for p in repo.dirstate.parents()] |
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else: |
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parents = cl.parentrevs(r) |
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for p in parents: |
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if p < 0: |
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continue |
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if p not in side: |
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# first time we see p; add it to visit |
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side[p] = side[r] |
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if side[p]: |
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interesting += 1 |
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heapq.heappush(visit, -p) |
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elif side[p] and side[p] != side[r]: |
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# p was interesting but now we know better |
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side[p] = 0 |
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interesting -= 1 |
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hascommonancestor = True |
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if side[r]: |
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limit = r # lowest rev visited |
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interesting -= 1 |
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|
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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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""" |
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Find moves and copies between context c1 and c2 |
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""" |
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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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# avoid silly behavior for parent -> working dir |
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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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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 or of in c2: |
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|
199 |
del diverge[of] # not actually divergent, or not a rename |
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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: |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
238 |
# files from the same directory moved to two different places |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
239 |
invalid.add(dsrc) |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
240 |
else: |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
241 |
# looks good so far |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
242 |
dirmove[dsrc + "/"] = ddst + "/" |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
243 |
|
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
244 |
for i in invalid: |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
245 |
if i in dirmove: |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
246 |
del dirmove[i] |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
247 |
del d1, d2, invalid |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
248 |
|
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
249 |
if not dirmove: |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
250 |
return copy, diverge |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
251 |
|
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
252 |
for d in dirmove: |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
253 |
repo.ui.debug(" dir %s -> %s\n" % (d, dirmove[d])) |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
254 |
|
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
255 |
# check unaccounted nonoverlapping files against directory moves |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
256 |
for f in u1 + u2: |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
257 |
if f not in fullcopy: |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
258 |
for d in dirmove: |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
259 |
if f.startswith(d): |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
260 |
# new file added in a directory that was moved, move it |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
261 |
df = dirmove[d] + f[len(d):] |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
262 |
if df not in copy: |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
263 |
copy[f] = df |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
264 |
repo.ui.debug(" file %s -> %s\n" % (f, copy[f])) |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
265 |
break |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
266 |
|
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
267 |
return copy, diverge |