Mercurial > hg
annotate hgext/split.py @ 46843:728d89f6f9b1
refactor: prefer checks against nullrev over nullid
A common pattern is using a changeset context and obtaining the node to
compare against nullid. Change this to obtain the nullrev instead. In
the future, the nullid becomes a property of the repository and is no
longer a global constant, so using nullrev is much easier to reason
about. Python function call overhead makes the difference moot, but
future changes will result in more dictionary lookups otherwise, so
prefer the simpler pattern.
Differential Revision: https://phab.mercurial-scm.org/D10290
author | Joerg Sonnenberger <joerg@bec.de> |
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date | Tue, 30 Mar 2021 02:32:30 +0200 |
parents | 7f6c002d7c0a |
children | 8ee1ac083ee7 |
rev | line source |
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35455 | 1 # split.py - split a changeset into smaller ones |
2 # | |
3 # Copyright 2015 Laurent Charignon <lcharignon@fb.com> | |
4 # Copyright 2017 Facebook, Inc. | |
5 # | |
6 # This software may be used and distributed according to the terms of the | |
7 # GNU General Public License version 2 or any later version. | |
8 """command to split a changeset into smaller ones (EXPERIMENTAL)""" | |
9 | |
10 from __future__ import absolute_import | |
11 | |
12 from mercurial.i18n import _ | |
13 | |
14 from mercurial.node import ( | |
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15 nullrev, |
35455 | 16 short, |
17 ) | |
18 | |
19 from mercurial import ( | |
20 bookmarks, | |
21 cmdutil, | |
22 commands, | |
23 error, | |
24 hg, | |
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25 pycompat, |
35455 | 26 registrar, |
27 revsetlang, | |
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28 rewriteutil, |
35455 | 29 scmutil, |
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30 util, |
35455 | 31 ) |
32 | |
33 # allow people to use split without explicitly enabling rebase extension | |
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34 from . import rebase |
35455 | 35 |
36 cmdtable = {} | |
37 command = registrar.command(cmdtable) | |
38 | |
39 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for | |
40 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should | |
41 # be specifying the version(s) of Mercurial they are tested with, or | |
42 # leave the attribute unspecified. | |
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43 testedwith = b'ships-with-hg-core' |
35455 | 44 |
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45 |
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46 @command( |
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47 b'split', |
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48 [ |
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49 (b'r', b'rev', b'', _(b"revision to split"), _(b'REV')), |
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50 (b'', b'rebase', True, _(b'rebase descendants after split')), |
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51 ] |
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52 + cmdutil.commitopts2, |
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53 _(b'hg split [--no-rebase] [[-r] REV]'), |
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54 helpcategory=command.CATEGORY_CHANGE_MANAGEMENT, |
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55 helpbasic=True, |
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56 ) |
35455 | 57 def split(ui, repo, *revs, **opts): |
58 """split a changeset into smaller ones | |
59 | |
60 Repeatedly prompt changes and commit message for new changesets until there | |
61 is nothing left in the original changeset. | |
62 | |
63 If --rev was not given, split the working directory parent. | |
64 | |
65 By default, rebase connected non-obsoleted descendants onto the new | |
66 changeset. Use --no-rebase to avoid the rebase. | |
67 """ | |
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68 opts = pycompat.byteskwargs(opts) |
35455 | 69 revlist = [] |
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70 if opts.get(b'rev'): |
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71 revlist.append(opts.get(b'rev')) |
35455 | 72 revlist.extend(revs) |
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73 with repo.wlock(), repo.lock(): |
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74 tr = repo.transaction(b'split') |
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75 # If the rebase somehow runs into conflicts, make sure |
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76 # we close the transaction so the user can continue it. |
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77 with util.acceptintervention(tr): |
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78 revs = scmutil.revrange(repo, revlist or [b'.']) |
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79 if len(revs) > 1: |
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80 raise error.InputError(_(b'cannot split multiple revisions')) |
35455 | 81 |
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82 rev = revs.first() |
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83 # Handle nullrev specially here (instead of leaving for precheck() |
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84 # below) so we get a nicer message and error code. |
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85 if rev is None or rev == nullrev: |
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86 ui.status(_(b'nothing to split\n')) |
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87 return 1 |
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88 ctx = repo[rev] |
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89 if ctx.node() is None: |
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90 raise error.InputError(_(b'cannot split working directory')) |
35455 | 91 |
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92 if opts.get(b'rebase'): |
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93 # Skip obsoleted descendants and their descendants so the rebase |
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94 # won't cause conflicts for sure. |
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95 descendants = list(repo.revs(b'(%d::) - (%d)', rev, rev)) |
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96 torebase = list( |
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97 repo.revs( |
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98 b'%ld - (%ld & obsolete())::', descendants, descendants |
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99 ) |
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100 ) |
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101 else: |
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102 torebase = [] |
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103 rewriteutil.precheck(repo, [rev] + torebase, b'split') |
35455 | 104 |
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105 if len(ctx.parents()) > 1: |
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106 raise error.InputError(_(b'cannot split a merge changeset')) |
35455 | 107 |
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108 cmdutil.bailifchanged(repo) |
35455 | 109 |
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110 # Deactivate bookmark temporarily so it won't get moved |
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111 # unintentionally |
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112 bname = repo._activebookmark |
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113 if bname and repo._bookmarks[bname] != ctx.node(): |
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114 bookmarks.deactivate(repo) |
35455 | 115 |
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116 wnode = repo[b'.'].node() |
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117 top = None |
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118 try: |
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119 top = dosplit(ui, repo, tr, ctx, opts) |
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120 finally: |
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121 # top is None: split failed, need update --clean recovery. |
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122 # wnode == ctx.node(): wnode split, no need to update. |
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123 if top is None or wnode != ctx.node(): |
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124 hg.clean(repo, wnode, show_stats=False) |
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125 if bname: |
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126 bookmarks.activate(repo, bname) |
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127 if torebase and top: |
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128 dorebase(ui, repo, torebase, top) |
35455 | 129 |
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130 |
35455 | 131 def dosplit(ui, repo, tr, ctx, opts): |
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132 committed = [] # [ctx] |
35455 | 133 |
134 # Set working parent to ctx.p1(), and keep working copy as ctx's content | |
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135 if ctx.node() != repo.dirstate.p1(): |
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136 hg.clean(repo, ctx.node(), show_stats=False) |
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137 with repo.dirstate.parentchange(): |
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138 scmutil.movedirstate(repo, ctx.p1()) |
35455 | 139 |
140 # Any modified, added, removed, deleted result means split is incomplete | |
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141 def incomplete(repo): |
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142 st = repo.status() |
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143 return any((st.modified, st.added, st.removed, st.deleted)) |
35455 | 144 |
145 # Main split loop | |
146 while incomplete(repo): | |
147 if committed: | |
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148 header = _( |
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149 b'HG: Splitting %s. So far it has been split into:\n' |
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150 ) % short(ctx.node()) |
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151 # We don't want color codes in the commit message template, so |
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152 # disable the label() template function while we render it. |
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153 with ui.configoverride( |
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154 {(b'templatealias', b'label(l,x)'): b"x"}, b'split' |
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155 ): |
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156 for c in committed: |
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157 summary = cmdutil.format_changeset_summary(ui, c, b'split') |
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158 header += _(b'HG: - %s\n') % summary |
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159 header += _( |
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160 b'HG: Write commit message for the next split changeset.\n' |
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161 ) |
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163 header = _( |
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164 b'HG: Splitting %s. Write commit message for the ' |
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165 b'first split changeset.\n' |
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166 ) % short(ctx.node()) |
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167 opts.update( |
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168 { |
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169 b'edit': True, |
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170 b'interactive': True, |
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171 b'message': header + ctx.description(), |
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172 } |
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173 ) |
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174 commands.commit(ui, repo, **pycompat.strkwargs(opts)) |
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175 newctx = repo[b'.'] |
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177 | |
178 if not committed: | |
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179 raise error.InputError(_(b'cannot split an empty revision')) |
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181 scmutil.cleanupnodes( |
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182 repo, |
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183 {ctx.node(): [c.node() for c in committed]}, |
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184 operation=b'split', |
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185 fixphase=True, |
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186 ) |
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188 return committed[-1] | |
189 | |
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190 |
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191 def dorebase(ui, repo, src, destctx): |
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192 rebase.rebase( |
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193 ui, |
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194 repo, |
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195 rev=[revsetlang.formatspec(b'%ld', src)], |
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196 dest=revsetlang.formatspec(b'%d', destctx.rev()), |
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197 ) |