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annotate mercurial/graphmod.py @ 12951:101366ad816c stable

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graphmod: safer code when a changeset has two identical parents While this situation should never under normal use, some real life repos sometimes contain such changesets (older hg versions, broken rebases, etc...) hgweb was displaying an "Internal error" in this case, and graphlog displayed a redundant branch all the way to null: it does not cost us much to just ignore this extra parent when constructing the DAG.
author Nicolas Dumazet <nicdumz.commits@gmail.com>
date Mon, 08 Nov 2010 22:45:56 +0900
parents 94145b531cf9
children 9966c95b8c4f
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1 # Revision graph generator for Mercurial
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2 #
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3 # Copyright 2008 Dirkjan Ochtman <dirkjan@ochtman.nl>
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4 # Copyright 2007 Joel Rosdahl <joel@rosdahl.net>
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5 #
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6 # This software may be used and distributed according to the terms of the
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7 # GNU General Public License version 2 or any later version.
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8
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9 """supports walking the history as DAGs suitable for graphical output
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10
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11 The most basic format we use is that of::
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12
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13 (id, type, data, [parentids])
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14
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15 The node and parent ids are arbitrary integers which identify a node in the
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16 context of the graph returned. Type is a constant specifying the node type.
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17 Data depends on type.
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18 """
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19
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20 from mercurial.node import nullrev
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21
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22 CHANGESET = 'C'
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23
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24 def revisions(repo, start, stop):
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25 """cset DAG generator yielding (id, CHANGESET, ctx, [parentids]) tuples
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26
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27 This generator function walks through the revision history from revision
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28 start to revision stop (which must be less than or equal to start). It
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29 returns a tuple for each node. The node and parent ids are arbitrary
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30 integers which identify a node in the context of the graph returned.
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31 """
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32 cur = start
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33 while cur >= stop:
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34 ctx = repo[cur]
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35 parents = set([p.rev() for p in ctx.parents() if p.rev() != nullrev])
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36 yield (cur, CHANGESET, ctx, sorted(parents))
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37 cur -= 1
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38
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39 def filerevs(repo, path, start, stop, limit=None):
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40 """file cset DAG generator yielding (id, CHANGESET, ctx, [parentids]) tuples
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41
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42 This generator function walks through the revision history of a single
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43 file from revision start down to revision stop.
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44 """
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45 filerev = len(repo.file(path)) - 1
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46 rev = stop + 1
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47 count = 0
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48 while filerev >= 0 and rev > stop:
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49 fctx = repo.filectx(path, fileid=filerev)
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50 parents = set([f.linkrev() for f in fctx.parents() if f.path() == path])
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51 rev = fctx.rev()
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52 if rev <= start:
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53 yield (rev, CHANGESET, fctx.changectx(), sorted(parents))
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54 count += 1
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55 if count == limit:
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56 break
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57 filerev -= 1
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58
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59 def nodes(repo, nodes):
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60 """cset DAG generator yielding (id, CHANGESET, ctx, [parentids]) tuples
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61
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62 This generator function walks the given nodes. It only returns parents
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63 that are in nodes, too.
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64 """
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65 include = set(nodes)
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66 for node in nodes:
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67 ctx = repo[node]
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68 parents = set([p.rev() for p in ctx.parents() if p.node() in include])
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69 yield (ctx.rev(), CHANGESET, ctx, sorted(parents))
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70
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71 def colored(dag):
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72 """annotates a DAG with colored edge information
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73
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74 For each DAG node this function emits tuples::
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75
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76 (id, type, data, (col, color), [(col, nextcol, color)])
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77
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78 with the following new elements:
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79
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80 - Tuple (col, color) with column and color index for the current node
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81 - A list of tuples indicating the edges between the current node and its
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82 parents.
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83 """
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84 seen = []
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85 colors = {}
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86 newcolor = 1
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87 for (cur, type, data, parents) in dag:
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88
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89 # Compute seen and next
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90 if cur not in seen:
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91 seen.append(cur) # new head
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92 colors[cur] = newcolor
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93 newcolor += 1
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94
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95 col = seen.index(cur)
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96 color = colors.pop(cur)
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97 next = seen[:]
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98
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99 # Add parents to next
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100 addparents = [p for p in parents if p not in next]
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101 next[col:col + 1] = addparents
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102
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103 # Set colors for the parents
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104 for i, p in enumerate(addparents):
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105 if not i:
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106 colors[p] = color
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107 else:
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108 colors[p] = newcolor
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109 newcolor += 1
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110
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111 # Add edges to the graph
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112 edges = []
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113 for ecol, eid in enumerate(seen):
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114 if eid in next:
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115 edges.append((ecol, next.index(eid), colors[eid]))
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116 elif eid == cur:
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117 for p in parents:
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118 edges.append((ecol, next.index(p), color))
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119
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120 # Yield and move on
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121 yield (cur, type, data, (col, color), edges)
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122 seen = next