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annotate hgext3rd/topic/stack.py @ 1909:36112e361ee4

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stack: display the base of the stack Displaying the first parent of the stack seems useful. I'm even tempted to call it 't0' and have the topic still active when 'hg up t0' is used to move to the base. As a side effect we gain a way to denote that the stack is not linear. I'm not super convinced that it is the right way to display it, but this is better than no information.
author Pierre-Yves David <pierre-yves.david@fb.com>
date Mon, 14 Mar 2016 23:37:58 +0000
parents 95874e8fc5f2
children 17782631d7e8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1895
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1 # stack.py - code related to stack workflow
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2 #
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3 # This software may be used and distributed according to the terms of the
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4 # GNU General Public License version 2 or any later version.
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5 import collections
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6 from mercurial.i18n import _
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7 from mercurial import error
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8 from mercurial import extensions
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9 from mercurial import obsolete
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10
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11 def getstack(repo, topic):
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12 # XXX need sorting
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13 trevs = repo.revs("topic(%s) - obsolete()", topic)
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14 return _orderrevs(repo, trevs)
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15
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16 def showstack(ui, repo, topic, opts):
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17 if not topic:
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18 topic = repo.currenttopic
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19 if not topic:
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20 raise error.Abort(_('no active topic to list'))
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21 fm = ui.formatter('topicstack', opts)
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22 prev = None
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23 for idx, r in enumerate(getstack(repo, topic)):
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24 ctx = repo[r]
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25 p1 = ctx.p1()
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26 if p1.obsolete():
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27 p1 = repo[_singlesuccessor(repo, p1)]
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28 if p1.rev() != prev:
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29 # display the parent of the chanset
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30 state = 'base'
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31 symbol= '_'
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32 fm.startitem()
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33 fm.plain(' ') # XXX 2 is the right padding by chance
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34 fm.write('topic.stack.state', '%s', symbol,
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35 label='topic.stack.state topic.stack.state.%s' % state)
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36 fm.plain(' ')
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37 fm.write('topic.stack.desc', '%s',
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38 p1.description().splitlines()[0],
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39 label='topic.stack.desc topic.stack.desc.%s' % state)
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40 fm.plain('\n')
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41 fm.end()
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42 # super crude initial version
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43 symbol = ':'
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44 state = 'clean'
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45 if repo.revs('%d and parents()', r):
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46 symbol = '@'
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47 state = 'current'
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48 if repo.revs('%d and unstable()', r):
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49 symbol = '$'
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50 state = 'unstable'
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51 fm.startitem()
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52 fm.write('topic.stack.index', 't%d', idx,
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53 label='topic.stack.index topic.stack.index.%s' % state)
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54 fm.write('topic.stack.state.symbol', '%s', symbol,
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55 label='topic.stack.state topic.stack.state.%s' % state)
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56 fm.plain(' ')
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57 fm.write('topic.stack.desc', '%s', ctx.description().splitlines()[0],
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58 label='topic.stack.desc topic.stack.desc.%s' % state)
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59 fm.condwrite(state != 'clean', 'topic.stack.state', ' (%s)', state,
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60 label='topic.stack.state topic.stack.state.%s' % state)
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61 fm.plain('\n')
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62 fm.end()
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63 prev = r
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64
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65 # Copied from evolve 081605c2e9b6
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66
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67 def _orderrevs(repo, revs):
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68 """Compute an ordering to solve instability for the given revs
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69
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70 revs is a list of unstable revisions.
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71
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72 Returns the same revisions ordered to solve their instability from the
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73 bottom to the top of the stack that the stabilization process will produce
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74 eventually.
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75
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76 This ensures the minimal number of stabilizations, as we can stabilize each
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77 revision on its final stabilized destination.
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78 """
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79 # Step 1: Build the dependency graph
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80 dependencies, rdependencies = builddependencies(repo, revs)
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81 # Step 2: Build the ordering
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82 # Remove the revisions with no dependency(A) and add them to the ordering.
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83 # Removing these revisions leads to new revisions with no dependency (the
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84 # one depending on A) that we can remove from the dependency graph and add
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85 # to the ordering. We progress in a similar fashion until the ordering is
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86 # built
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87 solvablerevs = [r for r in sorted(dependencies.keys())
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88 if not dependencies[r]]
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89 ordering = []
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90 while solvablerevs:
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91 rev = solvablerevs.pop()
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92 for dependent in rdependencies[rev]:
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93 dependencies[dependent].remove(rev)
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94 if not dependencies[dependent]:
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95 solvablerevs.append(dependent)
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96 del dependencies[rev]
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97 ordering.append(rev)
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98
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99 ordering.extend(sorted(dependencies))
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100 return ordering
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101
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102 def builddependencies(repo, revs):
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103 """returns dependency graphs giving an order to solve instability of revs
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104 (see _orderrevs for more information on usage)"""
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105
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106 # For each troubled revision we keep track of what instability if any should
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107 # be resolved in order to resolve it. Example:
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108 # dependencies = {3: [6], 6:[]}
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109 # Means that: 6 has no dependency, 3 depends on 6 to be solved
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110 dependencies = {}
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111 # rdependencies is the inverted dict of dependencies
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112 rdependencies = collections.defaultdict(set)
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113
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114 for r in revs:
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115 dependencies[r] = set()
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116 for p in repo[r].parents():
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117 try:
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118 succ = _singlesuccessor(repo, p)
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119 except MultipleSuccessorsError as exc:
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120 dependencies[r] = exc.successorssets
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121 continue
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122 if succ in revs:
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123 dependencies[r].add(succ)
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124 rdependencies[succ].add(r)
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125 return dependencies, rdependencies
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126
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127 def _singlesuccessor(repo, p):
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128 """returns p (as rev) if not obsolete or its unique latest successors
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129
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130 fail if there are no such successor"""
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131
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132 if not p.obsolete():
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133 return p.rev()
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134 obs = repo[p]
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135 ui = repo.ui
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136 newer = obsolete.successorssets(repo, obs.node())
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137 # search of a parent which is not killed
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138 while not newer:
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139 ui.debug("stabilize target %s is plain dead,"
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140 " trying to stabilize on its parent\n" %
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141 obs)
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142 obs = obs.parents()[0]
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143 newer = obsolete.successorssets(repo, obs.node())
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144 if len(newer) > 1 or len(newer[0]) > 1:
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145 raise MultipleSuccessorsError(newer)
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146
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147 return repo[newer[0][0]].rev()
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148
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149 class MultipleSuccessorsError(RuntimeError):
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150 """Exception raised by _singlesuccessor when multiple successor sets exists
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151
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152 The object contains the list of successorssets in its 'successorssets'
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153 attribute to call to easily recover.
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154 """
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155
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156 def __init__(self, successorssets):
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157 self.successorssets = successorssets