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annotate mercurial/phases.py @ 15482:a667c89e49b3

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phases: add retractboundary function to move boundary backward The advanceboundary documentation is updated to highlight the difference.
author Pierre-Yves David <pierre-yves.david@ens-lyon.org>
date Fri, 11 Nov 2011 00:16:53 +0100
parents 0b7ce2f739fb
children 79cc89de5be1
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1 # Mercurial phases support code
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2 #
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3 # Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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4 # Logilab SA <contact@logilab.fr>
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5 # Augie Fackler <durin42@gmail.com>
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6 #
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7 # This software may be used and distributed according to the terms of the
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8 # GNU General Public License version 2 or any later version.
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9
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10 import errno
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11 from node import nullid, bin, hex, short
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12 from i18n import _
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13
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14 allphases = range(2)
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15 trackedphases = allphases[1:]
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16
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17 def readroots(repo):
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18 """Read phase roots from disk"""
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19 roots = [set() for i in allphases]
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20 roots[0].add(nullid)
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21 try:
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22 f = repo.sopener('phaseroots')
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23 try:
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24 for line in f:
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25 phase, nh = line.strip().split()
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26 roots[int(phase)].add(bin(nh))
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27 finally:
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28 f.close()
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29 except IOError, inst:
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30 if inst.errno != errno.ENOENT:
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31 raise
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32 return roots
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33
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34 def writeroots(repo):
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35 """Write phase roots from disk"""
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36 f = repo.sopener('phaseroots', 'w', atomictemp=True)
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37 try:
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38 for phase, roots in enumerate(repo._phaseroots):
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39 for h in roots:
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40 f.write('%i %s\n' % (phase, hex(h)))
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41 repo._dirtyphases = False
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42 finally:
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43 f.close()
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44
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45 def filterunknown(repo, phaseroots=None):
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46 """remove unknown nodes from the phase boundary
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47
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48 no data is lost as unknown node only old data for their descentants
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49 """
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50 if phaseroots is None:
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51 phaseroots = repo._phaseroots
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52 for phase, nodes in enumerate(phaseroots):
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53 missing = [node for node in nodes if node not in repo]
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54 if missing:
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55 for mnode in missing:
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56 msg = _('Removing unknown node %(n)s from %(p)i-phase boundary')
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57 repo.ui.debug(msg, {'n': short(mnode), 'p': phase})
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58 nodes.symmetric_difference_update(missing)
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59 repo._dirtyphases = True
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60
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61 def advanceboundary(repo, targetphase, nodes):
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62 """Add nodes to a phase changing other nodes phases if necessary.
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63
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64 This function move boundary *forward* this means that all nodes are set
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65 in the target phase or kept in a *lower* phase.
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66
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67 Simplify boundary to contains phase roots only."""
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68 for phase in xrange(targetphase + 1, len(allphases)):
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69 # filter nodes that are not in a compatible phase already
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70 # XXX rev phase cache might have been invalidated by a previous loop
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71 # XXX we need to be smarter here
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72 nodes = [n for n in nodes if repo[n].phase() >= phase]
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73 if not nodes:
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74 break # no roots to move anymore
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75 roots = repo._phaseroots[phase]
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76 olds = roots.copy()
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77 ctxs = list(repo.set('roots((%ln::) - (%ln::%ln))', olds, olds, nodes))
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78 roots.clear()
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79 roots.update(ctx.node() for ctx in ctxs)
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80 if olds != roots:
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81 # invalidate cache (we probably could be smarter here
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82 if '_phaserev' in vars(repo):
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83 del repo._phaserev
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84 repo._dirtyphases = True
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85
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86 def retractboundary(repo, targetphase, nodes):
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87 """Set nodes back to a phase changing other nodes phases if necessary.
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88
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89 This function move boundary *backward* this means that all nodes are set
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90 in the target phase or kept in a *higher* phase.
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91
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92 Simplify boundary to contains phase roots only."""
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93 currentroots = repo._phaseroots[targetphase]
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94 newroots = [n for n in nodes if repo[n].phase() < targetphase]
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95 if newroots:
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96 currentroots.update(newroots)
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97 ctxs = repo.set('roots(%ln::)', currentroots)
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98 currentroots.intersection_update(ctx.node() for ctx in ctxs)
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99 if '_phaserev' in vars(repo):
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100 del repo._phaserev
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101 repo._dirtyphases = True
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102