Mercurial > hg
annotate mercurial/state.py @ 48180:f78d8b8c46d7
setup: stop packaging python3.dll and python3X.dll in the wheel distribution
Now that exewrapper is smart enough to find the DLLs it needs without help from
the build script, backout ed286d150aa8 and 2960b7fac966. Note that this will
require deleting the build/lib.win-amd64-3.X directory to actually remove it
from the final wheel.
Differential Revision: https://phab.mercurial-scm.org/D11455
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Sun, 19 Sep 2021 01:36:37 -0400 |
parents | f38bf44e077f |
children | 6000f5b25c9b |
rev | line source |
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1 # state.py - writing and reading state files in Mercurial |
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2 # |
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3 # Copyright 2018 Pulkit Goyal <pulkitmgoyal@gmail.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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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 """ |
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9 This file contains class to wrap the state for commands and other |
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10 related logic. |
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11 |
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12 All the data related to the command state is stored as dictionary in the object. |
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13 The class has methods using which the data can be stored to disk in a file under |
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14 .hg/ directory. |
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15 |
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16 We store the data on disk in cbor, for which we use the CBOR format to encode |
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17 the data. |
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18 """ |
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19 |
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20 from __future__ import absolute_import |
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21 |
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22 import contextlib |
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23 |
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24 from .i18n import _ |
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25 |
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26 from . import ( |
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27 error, |
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28 pycompat, |
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29 util, |
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30 ) |
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31 from .utils import cborutil |
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32 |
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33 if pycompat.TYPE_CHECKING: |
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34 from typing import ( |
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35 Any, |
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36 Dict, |
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37 ) |
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38 |
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39 for t in (Any, Dict): |
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40 assert t |
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41 |
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42 |
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43 class cmdstate(object): |
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44 """a wrapper class to store the state of commands like `rebase`, `graft`, |
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45 `histedit`, `shelve` etc. Extensions can also use this to write state files. |
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46 |
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47 All the data for the state is stored in the form of key-value pairs in a |
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48 dictionary. |
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49 |
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50 The class object can write all the data to a file in .hg/ directory and |
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51 can populate the object data reading that file. |
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52 |
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53 Uses cbor to serialize and deserialize data while writing and reading from |
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54 disk. |
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55 """ |
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56 |
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57 def __init__(self, repo, fname): |
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58 """repo is the repo object |
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59 fname is the file name in which data should be stored in .hg directory |
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60 """ |
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61 self._repo = repo |
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62 self.fname = fname |
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63 |
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64 def read(self): |
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65 # type: () -> Dict[bytes, Any] |
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66 """read the existing state file and return a dict of data stored""" |
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67 return self._read() |
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68 |
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69 def save(self, version, data): |
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70 """write all the state data stored to .hg/<filename> file |
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71 |
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72 we use third-party library cbor to serialize data to write in the file. |
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73 """ |
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74 if not isinstance(version, int): |
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75 raise error.ProgrammingError( |
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76 b"version of state file should be an integer" |
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77 ) |
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78 |
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79 with self._repo.vfs(self.fname, b'wb', atomictemp=True) as fp: |
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80 fp.write(b'%d\n' % version) |
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81 for chunk in cborutil.streamencode(data): |
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82 fp.write(chunk) |
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83 |
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84 def _read(self): |
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85 """reads the state file and returns a dictionary which contain |
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86 data in the same format as it was before storing""" |
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87 with self._repo.vfs(self.fname, b'rb') as fp: |
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88 try: |
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89 int(fp.readline()) |
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90 except ValueError: |
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91 raise error.CorruptedState( |
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92 b"unknown version of state file found" |
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93 ) |
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94 |
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95 return cborutil.decodeall(fp.read())[0] |
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96 |
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97 def delete(self): |
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98 """drop the state file if exists""" |
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99 util.unlinkpath(self._repo.vfs.join(self.fname), ignoremissing=True) |
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100 |
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101 def exists(self): |
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102 """check whether the state file exists or not""" |
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103 return self._repo.vfs.exists(self.fname) |
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104 |
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105 |
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106 class _statecheck(object): |
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107 """a utility class that deals with multistep operations like graft, |
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108 histedit, bisect, update etc and check whether such commands |
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109 are in an unfinished conditition or not and return appropriate message |
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110 and hint. |
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111 It also has the ability to register and determine the states of any new |
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112 multistep operation or multistep command extension. |
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113 """ |
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114 |
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115 def __init__( |
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116 self, |
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117 opname, |
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118 fname, |
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119 clearable, |
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120 allowcommit, |
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121 reportonly, |
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122 continueflag, |
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123 stopflag, |
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124 childopnames, |
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125 cmdmsg, |
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126 cmdhint, |
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127 statushint, |
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128 abortfunc, |
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129 continuefunc, |
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130 ): |
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131 self._opname = opname |
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132 self._fname = fname |
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133 self._clearable = clearable |
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134 self._allowcommit = allowcommit |
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135 self._reportonly = reportonly |
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136 self._continueflag = continueflag |
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137 self._stopflag = stopflag |
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138 self._childopnames = childopnames |
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139 self._delegating = False |
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140 self._cmdmsg = cmdmsg |
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141 self._cmdhint = cmdhint |
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142 self._statushint = statushint |
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143 self.abortfunc = abortfunc |
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144 self.continuefunc = continuefunc |
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145 |
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146 def statusmsg(self): |
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147 """returns the hint message corresponding to the command for |
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148 hg status --verbose |
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149 """ |
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150 if not self._statushint: |
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151 hint = _( |
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152 b'To continue: hg %s --continue\n' |
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153 b'To abort: hg %s --abort' |
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154 ) % (self._opname, self._opname) |
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155 if self._stopflag: |
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156 hint = hint + ( |
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157 _(b'\nTo stop: hg %s --stop') % (self._opname) |
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158 ) |
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159 return hint |
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160 return self._statushint |
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161 |
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162 def hint(self): |
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163 """returns the hint message corresponding to an interrupted |
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164 operation |
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165 """ |
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166 if not self._cmdhint: |
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167 if not self._stopflag: |
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168 return _(b"use 'hg %s --continue' or 'hg %s --abort'") % ( |
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169 self._opname, |
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170 self._opname, |
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171 ) |
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172 else: |
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173 return _( |
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174 b"use 'hg %s --continue', 'hg %s --abort', " |
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175 b"or 'hg %s --stop'" |
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176 ) % ( |
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177 self._opname, |
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178 self._opname, |
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179 self._opname, |
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180 ) |
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181 |
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182 return self._cmdhint |
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183 |
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184 def msg(self): |
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185 """returns the status message corresponding to the command""" |
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186 if not self._cmdmsg: |
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187 return _(b'%s in progress') % (self._opname) |
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188 return self._cmdmsg |
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189 |
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190 def continuemsg(self): |
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191 """returns appropriate continue message corresponding to command""" |
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192 return _(b'hg %s --continue') % (self._opname) |
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193 |
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194 def isunfinished(self, repo): |
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195 """determines whether a multi-step operation is in progress |
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196 or not |
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197 """ |
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198 if self._opname == b'merge': |
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199 return len(repo[None].parents()) > 1 |
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200 elif self._delegating: |
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201 return False |
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202 else: |
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203 return repo.vfs.exists(self._fname) |
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204 |
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205 |
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206 # A list of statecheck objects for multistep operations like graft. |
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207 _unfinishedstates = [] |
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208 _unfinishedstatesbyname = {} |
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209 |
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210 |
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211 def addunfinished( |
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212 opname, |
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213 fname, |
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214 clearable=False, |
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215 allowcommit=False, |
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216 reportonly=False, |
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217 continueflag=False, |
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218 stopflag=False, |
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219 childopnames=None, |
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220 cmdmsg=b"", |
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221 cmdhint=b"", |
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222 statushint=b"", |
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223 abortfunc=None, |
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224 continuefunc=None, |
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225 ): |
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226 """this registers a new command or operation to unfinishedstates |
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227 opname is the name the command or operation |
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228 fname is the file name in which data should be stored in .hg directory. |
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229 It is None for merge command. |
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230 clearable boolean determines whether or not interrupted states can be |
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231 cleared by running `hg update -C .` which in turn deletes the |
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232 state file. |
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233 allowcommit boolean decides whether commit is allowed during interrupted |
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234 state or not. |
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235 reportonly flag is used for operations like bisect where we just |
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236 need to detect the operation using 'hg status --verbose' |
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237 continueflag is a boolean determines whether or not a command supports |
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238 `--continue` option or not. |
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239 stopflag is a boolean that determines whether or not a command supports |
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240 --stop flag |
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241 childopnames is a list of other opnames this op uses as sub-steps of its |
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242 own execution. They must already be added. |
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243 cmdmsg is used to pass a different status message in case standard |
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244 message of the format "abort: cmdname in progress" is not desired. |
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245 cmdhint is used to pass a different hint message in case standard |
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246 message of the format "To continue: hg cmdname --continue |
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247 To abort: hg cmdname --abort" is not desired. |
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248 statushint is used to pass a different status message in case standard |
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249 message of the format ('To continue: hg cmdname --continue' |
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250 'To abort: hg cmdname --abort') is not desired |
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251 abortfunc stores the function required to abort an unfinished state. |
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252 continuefunc stores the function required to finish an interrupted |
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253 operation. |
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254 """ |
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255 childopnames = childopnames or [] |
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256 statecheckobj = _statecheck( |
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257 opname, |
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258 fname, |
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259 clearable, |
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260 allowcommit, |
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261 reportonly, |
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262 continueflag, |
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263 stopflag, |
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264 childopnames, |
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265 cmdmsg, |
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266 cmdhint, |
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267 statushint, |
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268 abortfunc, |
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269 continuefunc, |
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270 ) |
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271 |
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272 if opname == b'merge': |
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273 _unfinishedstates.append(statecheckobj) |
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274 else: |
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275 # This check enforces that for any op 'foo' which depends on op 'bar', |
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276 # 'foo' comes before 'bar' in _unfinishedstates. This ensures that |
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277 # getrepostate() always returns the most specific applicable answer. |
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278 for childopname in childopnames: |
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279 if childopname not in _unfinishedstatesbyname: |
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280 raise error.ProgrammingError( |
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281 _(b'op %s depends on unknown op %s') % (opname, childopname) |
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282 ) |
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283 |
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284 _unfinishedstates.insert(0, statecheckobj) |
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285 |
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286 if opname in _unfinishedstatesbyname: |
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287 raise error.ProgrammingError(_(b'op %s registered twice') % opname) |
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288 _unfinishedstatesbyname[opname] = statecheckobj |
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289 |
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290 |
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291 def _getparentandchild(opname, childopname): |
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292 p = _unfinishedstatesbyname.get(opname, None) |
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293 if not p: |
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294 raise error.ProgrammingError(_(b'unknown op %s') % opname) |
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295 if childopname not in p._childopnames: |
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296 raise error.ProgrammingError( |
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297 _(b'op %s does not delegate to %s') % (opname, childopname) |
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298 ) |
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299 c = _unfinishedstatesbyname[childopname] |
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300 return p, c |
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301 |
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302 |
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303 @contextlib.contextmanager |
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304 def delegating(repo, opname, childopname): |
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305 """context wrapper for delegations from opname to childopname. |
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306 |
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307 requires that childopname was specified when opname was registered. |
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308 |
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309 Usage: |
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310 def my_command_foo_that_uses_rebase(...): |
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311 ... |
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312 with state.delegating(repo, 'foo', 'rebase'): |
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313 _run_rebase(...) |
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314 ... |
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315 """ |
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316 |
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317 p, c = _getparentandchild(opname, childopname) |
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318 if p._delegating: |
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319 raise error.ProgrammingError( |
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320 _(b'cannot delegate from op %s recursively') % opname |
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321 ) |
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322 p._delegating = True |
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323 try: |
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324 yield |
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325 except error.ConflictResolutionRequired as e: |
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326 # Rewrite conflict resolution advice for the parent opname. |
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327 if e.opname == childopname: |
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328 raise error.ConflictResolutionRequired(opname) |
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329 raise e |
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330 finally: |
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331 p._delegating = False |
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332 |
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333 |
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334 def ischildunfinished(repo, opname, childopname): |
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335 """Returns true if both opname and childopname are unfinished.""" |
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336 |
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337 p, c = _getparentandchild(opname, childopname) |
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338 return (p._delegating or p.isunfinished(repo)) and c.isunfinished(repo) |
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339 |
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340 |
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341 def continuechild(ui, repo, opname, childopname): |
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342 """Checks that childopname is in progress, and continues it.""" |
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343 |
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344 p, c = _getparentandchild(opname, childopname) |
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345 if not ischildunfinished(repo, opname, childopname): |
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346 raise error.ProgrammingError( |
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347 _(b'child op %s of parent %s is not unfinished') |
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348 % (childopname, opname) |
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349 ) |
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350 if not c.continuefunc: |
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351 raise error.ProgrammingError( |
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352 _(b'op %s has no continue function') % childopname |
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353 ) |
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354 return c.continuefunc(ui, repo) |
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355 |
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356 |
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357 addunfinished( |
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358 b'update', |
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359 fname=b'updatestate', |
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360 clearable=True, |
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361 cmdmsg=_(b'last update was interrupted'), |
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362 cmdhint=_(b"use 'hg update' to get a consistent checkout"), |
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363 statushint=_(b"To continue: hg update ."), |
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364 ) |
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365 addunfinished( |
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366 b'bisect', |
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367 fname=b'bisect.state', |
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368 allowcommit=True, |
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369 reportonly=True, |
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370 statushint=_( |
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371 b'To mark the changeset good: hg bisect --good\n' |
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372 b'To mark the changeset bad: hg bisect --bad\n' |
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373 b'To abort: hg bisect --reset\n' |
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374 ), |
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375 ) |
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376 |
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377 |
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378 def getrepostate(repo): |
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379 # experimental config: commands.status.skipstates |
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380 skip = set(repo.ui.configlist(b'commands', b'status.skipstates')) |
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381 for state in _unfinishedstates: |
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382 if state._opname in skip: |
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383 continue |
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384 if state.isunfinished(repo): |
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385 return (state._opname, state.statusmsg()) |