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annotate mercurial/state.py @ 42532:12243f15d53e

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statecheck: added support for STATES This removes `STATES` from `state.py` and adds support to `statecheck` class to handle its features. `getrepostate()` function is modified accordingly. This adds a method 'cmdutil.addunfinished()' for appending to the unfinishedstate list so as to keep 'merge' and 'bisect' at the last. This also makes two separate message formats for `checkunfinished()` and `getrepostate()` as there were previously present. Results of test changed are shown. Differential Revision: https://phab.mercurial-scm.org/D6503
author Taapas Agrawal <taapas2897@gmail.com>
date Sun, 09 Jun 2019 02:12:58 +0530
parents 5bddd2244814
children 0231032729c4
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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 from .i18n import _
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23
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24 from . import (
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25 error,
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26 util,
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27 )
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28 from .utils import (
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29 cborutil,
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30 )
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31
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32 class cmdstate(object):
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33 """a wrapper class to store the state of commands like `rebase`, `graft`,
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34 `histedit`, `shelve` etc. Extensions can also use this to write state files.
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35
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36 All the data for the state is stored in the form of key-value pairs in a
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37 dictionary.
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38
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39 The class object can write all the data to a file in .hg/ directory and
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40 can populate the object data reading that file.
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41
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42 Uses cbor to serialize and deserialize data while writing and reading from
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43 disk.
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44 """
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45
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46 def __init__(self, repo, fname):
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47 """ repo is the repo object
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48 fname is the file name in which data should be stored in .hg directory
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49 """
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50 self._repo = repo
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51 self.fname = fname
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52
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53 def read(self):
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54 """read the existing state file and return a dict of data stored"""
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55 return self._read()
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56
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57 def save(self, version, data):
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58 """write all the state data stored to .hg/<filename> file
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59
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60 we use third-party library cbor to serialize data to write in the file.
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61 """
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62 if not isinstance(version, int):
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63 raise error.ProgrammingError("version of state file should be"
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64 " an integer")
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65
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66 with self._repo.vfs(self.fname, 'wb', atomictemp=True) as fp:
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67 fp.write('%d\n' % version)
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68 for chunk in cborutil.streamencode(data):
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69 fp.write(chunk)
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70
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71 def _read(self):
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72 """reads the state file and returns a dictionary which contain
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73 data in the same format as it was before storing"""
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74 with self._repo.vfs(self.fname, 'rb') as fp:
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75 try:
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76 int(fp.readline())
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77 except ValueError:
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78 raise error.CorruptedState("unknown version of state file"
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79 " found")
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80
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81 return cborutil.decodeall(fp.read())[0]
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82
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83 def delete(self):
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84 """drop the state file if exists"""
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85 util.unlinkpath(self._repo.vfs.join(self.fname), ignoremissing=True)
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86
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87 def exists(self):
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88 """check whether the state file exists or not"""
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89 return self._repo.vfs.exists(self.fname)
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90
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91 class _statecheck(object):
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92 """a utility class that deals with multistep operations like graft,
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93 histedit, bisect, update etc and check whether such commands
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94 are in an unfinished conditition or not and return appropriate message
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95 and hint.
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96 It also has the ability to register and determine the states of any new
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97 multistep operation or multistep command extension.
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98 """
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99
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100 def __init__(self, opname, fname, clearable=False, allowcommit=False,
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101 reportonly=False, stopflag=False, cmdmsg="", cmdhint="",
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102 statushint=""):
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103 """opname is the name the command or operation
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104 fname is the file name in which data should be stored in .hg directory.
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105 It is None for merge command.
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106 clearable boolean determines whether or not interrupted states can be
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107 cleared by running `hg update -C .` which in turn deletes the
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108 state file.
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109 allowcommit boolean decides whether commit is allowed during interrupted
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110 state or not.
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111 reportonly flag is used for operations like bisect where we just
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112 need to detect the operation using 'hg status --verbose'
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113 stopflag is a boolean that determines whether or not a command supports
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114 --stop flag
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115 cmdmsg is used to pass a different status message in case standard
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116 message of the format "abort: cmdname in progress" is not desired.
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117 cmdhint is used to pass a different hint message in case standard
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118 message of the format "To continue: hg cmdname --continue
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119 To abort: hg cmdname --abort" is not desired.
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120 statushint is used to pass a different status message in case standard
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121 message of the format ('To continue: hg cmdname --continue'
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122 'To abort: hg cmdname --abort') is not desired
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123 """
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124 self._opname = opname
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125 self._fname = fname
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126 self._clearable = clearable
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127 self._allowcommit = allowcommit
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128 self._cmdhint = cmdhint
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129 self._statushint = statushint
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130 self._cmdmsg = cmdmsg
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131 self._stopflag = stopflag
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132 self._reportonly = reportonly
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133
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134 def statusmsg(self):
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135 """returns the hint message corresponding to the command for
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136 hg status --verbose
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137 """
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138 if not self._statushint:
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139 hint = (_('To continue: hg %s --continue\n'
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140 'To abort: hg %s --abort') % (self._opname,
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141 self._opname))
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142 if self._stopflag:
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143 hint = hint + (_('\nTo stop: hg %s --stop') %
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144 (self._opname))
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145 return hint
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146 return self._statushint
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147
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148 def hint(self):
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149 """returns the hint message corresponding to an interrupted
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150 operation
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151 """
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152 if not self._cmdhint:
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153 return (_("use 'hg %s --continue' or 'hg %s --abort'") %
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154 (self._opname, self._opname))
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155 return self._cmdhint
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156
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157 def msg(self):
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158 """returns the status message corresponding to the command"""
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159 if not self._cmdmsg:
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160 return _('%s in progress') % (self._opname)
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161 return self._cmdmsg
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162
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163 def isunfinished(self, repo):
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164 """determines whether a multi-step operation is in progress
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165 or not
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166 """
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167 if self._opname == 'merge':
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168 return len(repo[None].parents()) > 1
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169 else:
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170 return repo.vfs.exists(self._fname)
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171
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172 # A list of statecheck objects for multistep operations like graft.
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173 _unfinishedstates = []
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174
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175 def addunfinished(opname, **kwargs):
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176 """this registers a new command or operation to unfinishedstates
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177 """
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178 statecheckobj = _statecheck(opname, **kwargs)
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179 if opname == 'merge':
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180 _unfinishedstates.append(statecheckobj)
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181 else:
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182 _unfinishedstates.insert(0, statecheckobj)
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183
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184 addunfinished(
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185 'graft', fname='graftstate', clearable=True, stopflag=True,
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186 cmdhint=_("use 'hg graft --continue' or 'hg graft --stop' to stop"),
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187 )
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188 addunfinished(
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189 'update', fname='updatestate', clearable=True,
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190 cmdmsg=_('last update was interrupted'),
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191 cmdhint=_("use 'hg update' to get a consistent checkout"),
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192 statushint=_("To continue: hg update")
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193 )
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194 addunfinished(
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195 'bisect', fname='bisect.state', allowcommit=True, reportonly=True,
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196 statushint=_('To mark the changeset good: hg bisect --good\n'
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197 'To mark the changeset bad: hg bisect --bad\n'
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198 'To abort: hg bisect --reset\n')
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199 )
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200 addunfinished(
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201 'merge', fname=None, clearable=True, allowcommit=True,
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202 cmdmsg=_('outstanding uncommitted merge'),
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203 statushint=_('To continue: hg commit\n'
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204 'To abort: hg merge --abort'),
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205 cmdhint=_("use 'hg commit' or 'hg merge --abort'")
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206 )
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207
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208 def getrepostate(repo):
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209 # experimental config: commands.status.skipstates
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210 skip = set(repo.ui.configlist('commands', 'status.skipstates'))
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211 for state in _unfinishedstates:
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212 if state._opname in skip:
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213 continue
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214 if state.isunfinished(repo):
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215 return (state._opname, state.statusmsg())