Mercurial > hg
annotate mercurial/destutil.py @ 28071:261324dd5f5b
merge: introduce method to minimize merge regions
In the next diff, we will use this to trim down the start and end of conflict
regions where the A and B sides both made the same changes.
author | Ryan McElroy <rmcelroy@fb.com> |
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date | Wed, 10 Feb 2016 08:25:03 -0800 |
parents | 6b1fc09c699a |
children | bd74b5e0d2c0 |
rev | line source |
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1 # destutil.py - Mercurial utility function for command destination |
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2 # |
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3 # Copyright Matt Mackall <mpm@selenic.com> and other |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 from .i18n import _ |
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11 from . import ( |
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12 bookmarks, |
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13 error, |
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14 obsolete, |
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15 ) |
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16 |
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17 def _destupdatevalidate(repo, rev, clean, check): |
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18 """validate that the destination comply to various rules |
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19 |
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20 This exists as its own function to help wrapping from extensions.""" |
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21 wc = repo[None] |
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22 p1 = wc.p1() |
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23 if not clean: |
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24 # Check that the update is linear. |
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25 # |
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26 # Mercurial do not allow update-merge for non linear pattern |
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27 # (that would be technically possible but was considered too confusing |
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28 # for user a long time ago) |
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29 # |
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30 # See mercurial.merge.update for details |
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31 if p1.rev() not in repo.changelog.ancestors([rev], inclusive=True): |
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32 dirty = wc.dirty(missing=True) |
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33 foreground = obsolete.foreground(repo, [p1.node()]) |
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34 if not repo[rev].node() in foreground: |
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35 if dirty: |
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36 msg = _("uncommitted changes") |
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37 hint = _("commit and merge, or update --clean to" |
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38 " discard changes") |
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39 raise error.UpdateAbort(msg, hint=hint) |
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40 elif not check: # destination is not a descendant. |
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41 msg = _("not a linear update") |
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42 hint = _("merge or update --check to force update") |
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43 raise error.UpdateAbort(msg, hint=hint) |
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44 |
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45 def _destupdateobs(repo, clean, check): |
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46 """decide of an update destination from obsolescence markers""" |
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47 node = None |
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48 wc = repo[None] |
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49 p1 = wc.p1() |
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50 movemark = None |
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51 |
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52 if p1.obsolete() and not p1.children(): |
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53 # allow updating to successors |
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54 successors = obsolete.successorssets(repo, p1.node()) |
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55 |
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56 # behavior of certain cases is as follows, |
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57 # |
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58 # divergent changesets: update to highest rev, similar to what |
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59 # is currently done when there are more than one head |
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60 # (i.e. 'tip') |
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61 # |
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62 # replaced changesets: same as divergent except we know there |
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63 # is no conflict |
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64 # |
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65 # pruned changeset: no update is done; though, we could |
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66 # consider updating to the first non-obsolete parent, |
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67 # similar to what is current done for 'hg prune' |
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68 |
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69 if successors: |
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70 # flatten the list here handles both divergent (len > 1) |
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71 # and the usual case (len = 1) |
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72 successors = [n for sub in successors for n in sub] |
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73 |
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74 # get the max revision for the given successors set, |
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75 # i.e. the 'tip' of a set |
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76 node = repo.revs('max(%ln)', successors).first() |
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77 if bookmarks.isactivewdirparent(repo): |
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78 movemark = repo['.'].node() |
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79 return node, movemark, None |
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80 |
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81 def _destupdatebook(repo, clean, check): |
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82 """decide on an update destination from active bookmark""" |
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83 # we also move the active bookmark, if any |
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84 activemark = None |
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85 node, movemark = bookmarks.calculateupdate(repo.ui, repo, None) |
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86 if node is not None: |
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87 activemark = node |
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88 return node, movemark, activemark |
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89 |
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90 def _destupdatebranch(repo, clean, check): |
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91 """decide on an update destination from current branch""" |
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92 wc = repo[None] |
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93 movemark = node = None |
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94 try: |
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95 node = repo.revs('max(.::(head() and branch(%s)))' |
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96 , wc.branch()).first() |
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97 if bookmarks.isactivewdirparent(repo): |
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98 movemark = repo['.'].node() |
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99 except error.RepoLookupError: |
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100 if wc.branch() == 'default': # no default branch! |
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101 node = repo.lookup('tip') # update to tip |
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102 else: |
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103 raise error.Abort(_("branch %s not found") % wc.branch()) |
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104 return node, movemark, None |
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105 |
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106 # order in which each step should be evalutated |
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107 # steps are run until one finds a destination |
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108 destupdatesteps = ['evolution', 'bookmark', 'branch'] |
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109 # mapping to ease extension overriding steps. |
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110 destupdatestepmap = {'evolution': _destupdateobs, |
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111 'bookmark': _destupdatebook, |
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112 'branch': _destupdatebranch, |
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113 } |
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114 |
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115 def destupdate(repo, clean=False, check=False): |
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116 """destination for bare update operation |
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117 |
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118 return (rev, movemark, activemark) |
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119 |
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120 - rev: the revision to update to, |
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121 - movemark: node to move the active bookmark from |
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122 (cf bookmark.calculate update), |
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123 - activemark: a bookmark to activate at the end of the update. |
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124 """ |
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125 node = movemark = activemark = None |
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126 |
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127 for step in destupdatesteps: |
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128 node, movemark, activemark = destupdatestepmap[step](repo, clean, check) |
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129 if node is not None: |
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130 break |
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131 rev = repo[node].rev() |
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132 |
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133 _destupdatevalidate(repo, rev, clean, check) |
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134 |
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135 return rev, movemark, activemark |
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136 |
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137 def _destmergebook(repo): |
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138 """find merge destination in the active bookmark case""" |
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139 node = None |
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140 bmheads = repo.bookmarkheads(repo._activebookmark) |
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141 curhead = repo[repo._activebookmark].node() |
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142 if len(bmheads) == 2: |
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143 if curhead == bmheads[0]: |
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144 node = bmheads[1] |
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145 else: |
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146 node = bmheads[0] |
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147 elif len(bmheads) > 2: |
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148 raise error.Abort(_("multiple matching bookmarks to merge - " |
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149 "please merge with an explicit rev or bookmark"), |
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150 hint=_("run 'hg heads' to see all heads")) |
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151 elif len(bmheads) <= 1: |
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152 raise error.Abort(_("no matching bookmark to merge - " |
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153 "please merge with an explicit rev or bookmark"), |
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154 hint=_("run 'hg heads' to see all heads")) |
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155 assert node is not None |
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156 return node |
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157 |
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158 def _destmergebranch(repo): |
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159 """find merge destination based on branch heads""" |
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160 node = None |
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161 branch = repo[None].branch() |
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162 bheads = repo.branchheads(branch) |
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163 nbhs = [bh for bh in bheads if not repo[bh].bookmarks()] |
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164 |
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165 if len(nbhs) > 2: |
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166 raise error.Abort(_("branch '%s' has %d heads - " |
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167 "please merge with an explicit rev") |
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168 % (branch, len(bheads)), |
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169 hint=_("run 'hg heads .' to see heads")) |
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170 |
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171 parent = repo.dirstate.p1() |
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172 if len(nbhs) <= 1: |
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173 if len(bheads) > 1: |
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174 raise error.Abort(_("heads are bookmarked - " |
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175 "please merge with an explicit rev"), |
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176 hint=_("run 'hg heads' to see all heads")) |
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177 if len(repo.heads()) > 1: |
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178 raise error.Abort(_("branch '%s' has one head - " |
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179 "please merge with an explicit rev") |
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180 % branch, |
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181 hint=_("run 'hg heads' to see all heads")) |
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182 msg, hint = _('nothing to merge'), None |
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183 if parent != repo.lookup(branch): |
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184 hint = _("use 'hg update' instead") |
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185 raise error.Abort(msg, hint=hint) |
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186 |
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187 if parent not in bheads: |
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188 raise error.Abort(_('working directory not at a head revision'), |
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189 hint=_("use 'hg update' or merge with an " |
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190 "explicit revision")) |
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191 if parent == nbhs[0]: |
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192 node = nbhs[-1] |
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193 else: |
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194 node = nbhs[0] |
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195 assert node is not None |
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196 return node |
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197 |
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198 def destmerge(repo): |
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199 if repo._activebookmark: |
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200 node = _destmergebook(repo) |
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201 else: |
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202 node = _destmergebranch(repo) |
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203 return repo[node].rev() |
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204 |
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205 histeditdefaultrevset = 'reverse(only(.) and not public() and not ::merge())' |
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206 |
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207 def desthistedit(ui, repo): |
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208 """Default base revision to edit for `hg histedit`.""" |
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209 # Avoid cycle: scmutil -> revset -> destutil |
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210 from . import scmutil |
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211 |
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212 default = ui.config('histedit', 'defaultrev', histeditdefaultrevset) |
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213 if default: |
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214 revs = scmutil.revrange(repo, [default]) |
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215 if revs: |
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216 # The revset supplied by the user may not be in ascending order nor |
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217 # take the first revision. So do this manually. |
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218 revs.sort() |
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219 return revs.first() |
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220 |
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221 return None |
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222 |
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223 def _statusotherbook(ui, repo): |
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224 bmheads = repo.bookmarkheads(repo._activebookmark) |
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225 curhead = repo[repo._activebookmark].node() |
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226 if repo.revs('%n and parents()', curhead): |
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227 # we are on the active bookmark |
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228 bmheads = [b for b in bmheads if curhead != b] |
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229 if bmheads: |
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230 msg = _('%i other divergent bookmarks for "%s"\n') |
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231 ui.status(msg % (len(bmheads), repo._activebookmark)) |
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232 |
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233 def _statusotherbranchheads(ui, repo): |
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234 currentbranch = repo.dirstate.branch() |
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235 heads = repo.branchheads(currentbranch) |
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236 l = len(heads) |
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237 if repo.revs('%ln and parents()', heads): |
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238 # we are on a head |
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239 heads = repo.revs('%ln - parents()', heads) |
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240 if heads and l != len(heads): |
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241 ui.status(_('%i other heads for branch "%s"\n') % |
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242 (len(heads), currentbranch)) |
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243 |
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244 def statusotherdests(ui, repo): |
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245 """Print message about other head""" |
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246 # XXX we should probably include a hint: |
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247 # - about what to do |
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248 # - how to see such heads |
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249 if repo._activebookmark: |
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250 _statusotherbook(ui, repo) |
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251 else: |
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252 _statusotherbranchheads(ui, repo) |