Mercurial > hg
annotate mercurial/filemerge.py @ 25018:93e015a3d1ea
commit: add ui.allowemptycommit config option
This adds a config flag that enables a user to make empty commits.
This is useful in a number of cases.
For instance, automation that creates release branches via
bookmarks may want to make empty commits to that release bookmark so that it
can't be fast-forwarded and so it can record information about the release
bookmark's creation. This is already possible with named branches, so making it
possible for bookmarks makes sense.
Another case we've wanted it is for mirroring repositories into Mercurial. We
have automation that syncs commits into hg by running things from the command
line. The ability to produce empty commits is useful for syncing unusual commits
from other VCS's.
In general, allowing the user to create the DAG as they see fit seems useful,
and when I mentioned this in IRC more than one person piped up and said they
were already hacking around this limitation by using mq, import, and
commit-dummy-change-then-amend-the-content-away style solutions.
author | Durham Goode <durham@fb.com> |
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date | Mon, 11 May 2015 16:18:28 -0700 |
parents | fd7287f0b43c |
children | 34ffe4c29782 |
rev | line source |
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1 # filemerge.py - file-level merge handling for Mercurial |
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2 # |
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3 # Copyright 2006, 2007, 2008 Matt Mackall <mpm@selenic.com> |
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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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7 |
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8 from node import short |
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9 from i18n import _ |
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10 import util, simplemerge, match, error, templater, templatekw |
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11 import os, tempfile, re, filecmp |
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12 import tagmerge |
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13 |
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14 def _toolstr(ui, tool, part, default=""): |
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15 return ui.config("merge-tools", tool + "." + part, default) |
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16 |
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17 def _toolbool(ui, tool, part, default=False): |
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18 return ui.configbool("merge-tools", tool + "." + part, default) |
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19 |
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20 def _toollist(ui, tool, part, default=[]): |
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21 return ui.configlist("merge-tools", tool + "." + part, default) |
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22 |
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23 internals = {} |
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24 # Merge tools to document. |
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25 internalsdoc = {} |
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26 |
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27 def internaltool(name, trymerge, onfailure=None): |
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28 '''return a decorator for populating internal merge tool table''' |
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29 def decorator(func): |
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30 fullname = ':' + name |
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31 func.__doc__ = "``%s``\n" % fullname + func.__doc__.strip() |
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32 internals[fullname] = func |
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33 internals['internal:' + name] = func |
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34 internalsdoc[fullname] = func |
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35 func.trymerge = trymerge |
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36 func.onfailure = onfailure |
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37 return func |
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38 return decorator |
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39 |
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40 def _findtool(ui, tool): |
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41 if tool in internals: |
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42 return tool |
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43 return findexternaltool(ui, tool) |
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44 |
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45 def findexternaltool(ui, tool): |
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46 for kn in ("regkey", "regkeyalt"): |
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47 k = _toolstr(ui, tool, kn) |
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48 if not k: |
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49 continue |
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50 p = util.lookupreg(k, _toolstr(ui, tool, "regname")) |
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51 if p: |
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52 p = util.findexe(p + _toolstr(ui, tool, "regappend")) |
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53 if p: |
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54 return p |
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55 exe = _toolstr(ui, tool, "executable", tool) |
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56 return util.findexe(util.expandpath(exe)) |
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57 |
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58 def _picktool(repo, ui, path, binary, symlink): |
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59 def check(tool, pat, symlink, binary): |
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60 tmsg = tool |
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61 if pat: |
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62 tmsg += " specified for " + pat |
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63 if not _findtool(ui, tool): |
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64 if pat: # explicitly requested tool deserves a warning |
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65 ui.warn(_("couldn't find merge tool %s\n") % tmsg) |
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66 else: # configured but non-existing tools are more silent |
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67 ui.note(_("couldn't find merge tool %s\n") % tmsg) |
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68 elif symlink and not _toolbool(ui, tool, "symlink"): |
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69 ui.warn(_("tool %s can't handle symlinks\n") % tmsg) |
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70 elif binary and not _toolbool(ui, tool, "binary"): |
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71 ui.warn(_("tool %s can't handle binary\n") % tmsg) |
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72 elif not util.gui() and _toolbool(ui, tool, "gui"): |
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73 ui.warn(_("tool %s requires a GUI\n") % tmsg) |
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74 else: |
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75 return True |
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76 return False |
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77 |
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78 # forcemerge comes from command line arguments, highest priority |
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79 force = ui.config('ui', 'forcemerge') |
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80 if force: |
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81 toolpath = _findtool(ui, force) |
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82 if toolpath: |
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83 return (force, util.shellquote(toolpath)) |
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84 else: |
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85 # mimic HGMERGE if given tool not found |
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86 return (force, force) |
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87 |
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88 # HGMERGE takes next precedence |
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89 hgmerge = os.environ.get("HGMERGE") |
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90 if hgmerge: |
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91 return (hgmerge, hgmerge) |
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92 |
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93 # then patterns |
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94 for pat, tool in ui.configitems("merge-patterns"): |
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95 mf = match.match(repo.root, '', [pat]) |
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96 if mf(path) and check(tool, pat, symlink, False): |
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97 toolpath = _findtool(ui, tool) |
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98 return (tool, util.shellquote(toolpath)) |
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99 |
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100 # then merge tools |
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101 tools = {} |
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102 for k, v in ui.configitems("merge-tools"): |
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103 t = k.split('.')[0] |
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104 if t not in tools: |
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105 tools[t] = int(_toolstr(ui, t, "priority", "0")) |
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106 names = tools.keys() |
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107 tools = sorted([(-p, t) for t, p in tools.items()]) |
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108 uimerge = ui.config("ui", "merge") |
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109 if uimerge: |
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110 if uimerge not in names: |
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111 return (uimerge, uimerge) |
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112 tools.insert(0, (None, uimerge)) # highest priority |
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113 tools.append((None, "hgmerge")) # the old default, if found |
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114 for p, t in tools: |
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115 if check(t, None, symlink, binary): |
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116 toolpath = _findtool(ui, t) |
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117 return (t, util.shellquote(toolpath)) |
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118 |
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119 # internal merge or prompt as last resort |
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120 if symlink or binary: |
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121 return ":prompt", None |
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122 return ":merge", None |
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123 |
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124 def _eoltype(data): |
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125 "Guess the EOL type of a file" |
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126 if '\0' in data: # binary |
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127 return None |
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128 if '\r\n' in data: # Windows |
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129 return '\r\n' |
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130 if '\r' in data: # Old Mac |
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131 return '\r' |
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132 if '\n' in data: # UNIX |
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133 return '\n' |
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134 return None # unknown |
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135 |
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136 def _matcheol(file, origfile): |
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137 "Convert EOL markers in a file to match origfile" |
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138 tostyle = _eoltype(util.readfile(origfile)) |
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139 if tostyle: |
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140 data = util.readfile(file) |
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141 style = _eoltype(data) |
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142 if style: |
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143 newdata = data.replace(style, tostyle) |
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144 if newdata != data: |
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145 util.writefile(file, newdata) |
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146 |
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147 @internaltool('prompt', False) |
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148 def _iprompt(repo, mynode, orig, fcd, fco, fca, toolconf): |
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149 """Asks the user which of the local or the other version to keep as |
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150 the merged version.""" |
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151 ui = repo.ui |
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152 fd = fcd.path() |
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153 |
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154 if ui.promptchoice(_(" no tool found to merge %s\n" |
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155 "keep (l)ocal or take (o)ther?" |
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156 "$$ &Local $$ &Other") % fd, 0): |
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157 return _iother(repo, mynode, orig, fcd, fco, fca, toolconf) |
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158 else: |
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159 return _ilocal(repo, mynode, orig, fcd, fco, fca, toolconf) |
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160 |
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161 @internaltool('local', False) |
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162 def _ilocal(repo, mynode, orig, fcd, fco, fca, toolconf): |
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163 """Uses the local version of files as the merged version.""" |
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164 return 0 |
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165 |
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166 @internaltool('other', False) |
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167 def _iother(repo, mynode, orig, fcd, fco, fca, toolconf): |
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168 """Uses the other version of files as the merged version.""" |
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169 repo.wwrite(fcd.path(), fco.data(), fco.flags()) |
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170 return 0 |
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171 |
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172 @internaltool('fail', False) |
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173 def _ifail(repo, mynode, orig, fcd, fco, fca, toolconf): |
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174 """ |
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175 Rather than attempting to merge files that were modified on both |
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176 branches, it marks them as unresolved. The resolve command must be |
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177 used to resolve these conflicts.""" |
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178 return 1 |
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179 |
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180 def _premerge(repo, toolconf, files, labels=None): |
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181 tool, toolpath, binary, symlink = toolconf |
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182 if symlink: |
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183 return 1 |
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184 a, b, c, back = files |
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185 |
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186 ui = repo.ui |
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187 |
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188 validkeep = ['keep', 'keep-merge3'] |
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189 |
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190 # do we attempt to simplemerge first? |
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191 try: |
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192 premerge = _toolbool(ui, tool, "premerge", not binary) |
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193 except error.ConfigError: |
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194 premerge = _toolstr(ui, tool, "premerge").lower() |
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195 if premerge not in validkeep: |
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196 _valid = ', '.join(["'" + v + "'" for v in validkeep]) |
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197 raise error.ConfigError(_("%s.premerge not valid " |
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198 "('%s' is neither boolean nor %s)") % |
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199 (tool, premerge, _valid)) |
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200 |
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201 if premerge: |
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202 if premerge == 'keep-merge3': |
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203 if not labels: |
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204 labels = _defaultconflictlabels |
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205 if len(labels) < 3: |
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206 labels.append('base') |
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207 r = simplemerge.simplemerge(ui, a, b, c, quiet=True, label=labels) |
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208 if not r: |
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209 ui.debug(" premerge successful\n") |
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210 return 0 |
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211 if premerge not in validkeep: |
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212 util.copyfile(back, a) # restore from backup and try again |
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213 return 1 # continue merging |
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214 |
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215 @internaltool('merge', True, |
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216 _("merging %s incomplete! " |
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217 "(edit conflicts, then use 'hg resolve --mark')\n")) |
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218 def _imerge(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None): |
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219 """ |
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220 Uses the internal non-interactive simple merge algorithm for merging |
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221 files. It will fail if there are any conflicts and leave markers in |
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222 the partially merged file. Markers will have two sections, one for each side |
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223 of merge.""" |
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224 tool, toolpath, binary, symlink = toolconf |
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225 if symlink: |
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226 repo.ui.warn(_('warning: internal :merge cannot merge symlinks ' |
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227 'for %s\n') % fcd.path()) |
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228 return False, 1 |
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229 r = _premerge(repo, toolconf, files, labels=labels) |
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230 if r: |
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231 a, b, c, back = files |
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232 |
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233 ui = repo.ui |
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234 |
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235 r = simplemerge.simplemerge(ui, a, b, c, label=labels) |
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236 return True, r |
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237 return False, 0 |
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238 |
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239 @internaltool('merge3', True, |
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240 _("merging %s incomplete! " |
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241 "(edit conflicts, then use 'hg resolve --mark')\n")) |
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242 def _imerge3(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None): |
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243 """ |
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244 Uses the internal non-interactive simple merge algorithm for merging |
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245 files. It will fail if there are any conflicts and leave markers in |
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246 the partially merged file. Marker will have three sections, one from each |
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247 side of the merge and one for the base content.""" |
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248 if not labels: |
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249 labels = _defaultconflictlabels |
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250 if len(labels) < 3: |
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251 labels.append('base') |
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252 return _imerge(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels) |
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253 |
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254 @internaltool('tagmerge', True, |
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255 _("automatic tag merging of %s failed! " |
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256 "(use 'hg resolve --tool :merge' or another merge " |
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257 "tool of your choice)\n")) |
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258 def _itagmerge(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None): |
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259 """ |
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260 Uses the internal tag merge algorithm (experimental). |
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261 """ |
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262 return tagmerge.merge(repo, fcd, fco, fca) |
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263 |
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264 @internaltool('dump', True) |
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265 def _idump(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None): |
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266 """ |
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267 Creates three versions of the files to merge, containing the |
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268 contents of local, other and base. These files can then be used to |
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269 perform a merge manually. If the file to be merged is named |
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270 ``a.txt``, these files will accordingly be named ``a.txt.local``, |
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271 ``a.txt.other`` and ``a.txt.base`` and they will be placed in the |
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272 same directory as ``a.txt``.""" |
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273 r = _premerge(repo, toolconf, files, labels=labels) |
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274 if r: |
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275 a, b, c, back = files |
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276 |
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277 fd = fcd.path() |
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278 |
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279 util.copyfile(a, a + ".local") |
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280 repo.wwrite(fd + ".other", fco.data(), fco.flags()) |
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281 repo.wwrite(fd + ".base", fca.data(), fca.flags()) |
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282 return False, r |
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283 |
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284 def _xmerge(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None): |
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285 r = _premerge(repo, toolconf, files, labels=labels) |
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286 if r: |
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287 tool, toolpath, binary, symlink = toolconf |
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288 a, b, c, back = files |
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289 out = "" |
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290 env = {'HG_FILE': fcd.path(), |
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291 'HG_MY_NODE': short(mynode), |
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292 'HG_OTHER_NODE': str(fco.changectx()), |
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293 'HG_BASE_NODE': str(fca.changectx()), |
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294 'HG_MY_ISLINK': 'l' in fcd.flags(), |
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295 'HG_OTHER_ISLINK': 'l' in fco.flags(), |
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296 'HG_BASE_ISLINK': 'l' in fca.flags(), |
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297 } |
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298 |
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299 ui = repo.ui |
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300 |
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301 args = _toolstr(ui, tool, "args", '$local $base $other') |
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302 if "$output" in args: |
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303 out, a = a, back # read input from backup, write to original |
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304 replace = {'local': a, 'base': b, 'other': c, 'output': out} |
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305 args = util.interpolate(r'\$', replace, args, |
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306 lambda s: util.shellquote(util.localpath(s))) |
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307 cmd = toolpath + ' ' + args |
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308 repo.ui.debug('launching merge tool: %s\n' % cmd) |
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309 r = ui.system(cmd, cwd=repo.root, environ=env) |
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310 repo.ui.debug('merge tool returned: %s\n' % r) |
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311 return True, r |
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312 return False, 0 |
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313 |
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314 def _formatconflictmarker(repo, ctx, template, label, pad): |
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315 """Applies the given template to the ctx, prefixed by the label. |
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316 |
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317 Pad is the minimum width of the label prefix, so that multiple markers |
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318 can have aligned templated parts. |
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319 """ |
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320 if ctx.node() is None: |
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321 ctx = ctx.p1() |
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322 |
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323 props = templatekw.keywords.copy() |
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324 props['templ'] = template |
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325 props['ctx'] = ctx |
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326 props['repo'] = repo |
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327 templateresult = template('conflictmarker', **props) |
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328 |
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329 label = ('%s:' % label).ljust(pad + 1) |
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330 mark = '%s %s' % (label, templater.stringify(templateresult)) |
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331 |
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332 if mark: |
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333 mark = mark.splitlines()[0] # split for safety |
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334 |
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335 # 8 for the prefix of conflict marker lines (e.g. '<<<<<<< ') |
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336 return util.ellipsis(mark, 80 - 8) |
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337 |
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338 _defaultconflictmarker = ('{node|short} ' + |
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339 '{ifeq(tags, "tip", "", "{tags} ")}' + |
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340 '{if(bookmarks, "{bookmarks} ")}' + |
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341 '{ifeq(branch, "default", "", "{branch} ")}' + |
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342 '- {author|user}: {desc|firstline}') |
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343 |
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344 _defaultconflictlabels = ['local', 'other'] |
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345 |
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346 def _formatlabels(repo, fcd, fco, fca, labels): |
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347 """Formats the given labels using the conflict marker template. |
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348 |
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349 Returns a list of formatted labels. |
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350 """ |
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351 cd = fcd.changectx() |
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352 co = fco.changectx() |
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353 ca = fca.changectx() |
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354 |
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355 ui = repo.ui |
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356 template = ui.config('ui', 'mergemarkertemplate', _defaultconflictmarker) |
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357 tmpl = templater.templater(None, cache={'conflictmarker': template}) |
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358 |
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359 pad = max(len(l) for l in labels) |
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360 |
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361 newlabels = [_formatconflictmarker(repo, cd, tmpl, labels[0], pad), |
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362 _formatconflictmarker(repo, co, tmpl, labels[1], pad)] |
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363 if len(labels) > 2: |
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364 newlabels.append(_formatconflictmarker(repo, ca, tmpl, labels[2], pad)) |
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365 return newlabels |
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366 |
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367 def filemerge(repo, mynode, orig, fcd, fco, fca, labels=None): |
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368 """perform a 3-way merge in the working directory |
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369 |
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370 mynode = parent node before merge |
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371 orig = original local filename before merge |
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372 fco = other file context |
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373 fca = ancestor file context |
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374 fcd = local file context for current/destination file |
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375 """ |
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376 |
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377 def temp(prefix, ctx): |
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378 pre = "%s~%s." % (os.path.basename(ctx.path()), prefix) |
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379 (fd, name) = tempfile.mkstemp(prefix=pre) |
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380 data = repo.wwritedata(ctx.path(), ctx.data()) |
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381 f = os.fdopen(fd, "wb") |
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382 f.write(data) |
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383 f.close() |
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384 return name |
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385 |
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386 if not fco.cmp(fcd): # files identical? |
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387 return None |
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388 |
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389 ui = repo.ui |
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390 fd = fcd.path() |
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391 binary = fcd.isbinary() or fco.isbinary() or fca.isbinary() |
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392 symlink = 'l' in fcd.flags() + fco.flags() |
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393 tool, toolpath = _picktool(repo, ui, fd, binary, symlink) |
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394 ui.debug("picked tool '%s' for %s (binary %s symlink %s)\n" % |
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395 (tool, fd, binary, symlink)) |
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396 |
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397 if tool in internals: |
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398 func = internals[tool] |
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399 trymerge = func.trymerge |
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400 onfailure = func.onfailure |
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401 else: |
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402 func = _xmerge |
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403 trymerge = True |
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404 onfailure = _("merging %s failed!\n") |
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405 |
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406 toolconf = tool, toolpath, binary, symlink |
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407 |
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408 if not trymerge: |
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409 return func(repo, mynode, orig, fcd, fco, fca, toolconf) |
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410 |
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411 a = repo.wjoin(fd) |
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412 b = temp("base", fca) |
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413 c = temp("other", fco) |
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414 back = a + ".orig" |
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415 util.copyfile(a, back) |
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416 |
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417 if orig != fco.path(): |
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418 ui.status(_("merging %s and %s to %s\n") % (orig, fco.path(), fd)) |
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419 else: |
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420 ui.status(_("merging %s\n") % fd) |
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421 |
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422 ui.debug("my %s other %s ancestor %s\n" % (fcd, fco, fca)) |
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423 |
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424 markerstyle = ui.config('ui', 'mergemarkers', 'basic') |
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425 if not labels: |
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426 labels = _defaultconflictlabels |
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427 if markerstyle != 'basic': |
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428 labels = _formatlabels(repo, fcd, fco, fca, labels) |
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429 |
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430 needcheck, r = func(repo, mynode, orig, fcd, fco, fca, toolconf, |
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431 (a, b, c, back), labels=labels) |
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432 if not needcheck: |
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433 if r: |
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434 if onfailure: |
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435 ui.warn(onfailure % fd) |
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436 else: |
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437 util.unlink(back) |
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438 |
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439 util.unlink(b) |
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440 util.unlink(c) |
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441 return r |
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442 |
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443 if not r and (_toolbool(ui, tool, "checkconflicts") or |
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444 'conflicts' in _toollist(ui, tool, "check")): |
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445 if re.search("^(<<<<<<< .*|=======|>>>>>>> .*)$", fcd.data(), |
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446 re.MULTILINE): |
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447 r = 1 |
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448 |
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449 checked = False |
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450 if 'prompt' in _toollist(ui, tool, "check"): |
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451 checked = True |
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452 if ui.promptchoice(_("was merge of '%s' successful (yn)?" |
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453 "$$ &Yes $$ &No") % fd, 1): |
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454 r = 1 |
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455 |
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456 if not r and not checked and (_toolbool(ui, tool, "checkchanged") or |
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457 'changed' in _toollist(ui, tool, "check")): |
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458 if filecmp.cmp(a, back): |
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459 if ui.promptchoice(_(" output file %s appears unchanged\n" |
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460 "was merge successful (yn)?" |
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461 "$$ &Yes $$ &No") % fd, 1): |
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462 r = 1 |
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463 |
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464 if _toolbool(ui, tool, "fixeol"): |
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465 _matcheol(a, back) |
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466 |
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467 if r: |
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468 if onfailure: |
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469 ui.warn(onfailure % fd) |
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470 else: |
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471 util.unlink(back) |
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472 |
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473 util.unlink(b) |
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474 util.unlink(c) |
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475 return r |
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476 |
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477 # tell hggettext to extract docstrings from these functions: |
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478 i18nfunctions = internals.values() |