Mercurial > public > mercurial-scm > python-hglib

annotate hglib/util.py @ 79:ca5f8f43e585

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branches: more robust parsing strategy The right side of output is more strictly defined than the left, so parse from right to left. This fixes issues with spaces in branch names.
author Matt Mackall <mpm@selenic.com>
date Wed, 09 Nov 2011 16:09:46 -0600
parents 4282391dd693
children f98d6e234cd9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 import itertools, cStringIO, error, os, subprocess
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3 def grouper(n, iterable):
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4 ''' list(grouper(2, range(4))) -> [(0, 1), (2, 3)] '''
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5 args = [iter(iterable)] * n
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6 return itertools.izip(*args)
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8 def eatlines(s, n):
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9 """
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10 >>> eatlines("1\\n2", 1)
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11 '2'
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12 >>> eatlines("1\\n2", 2)
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13 ''
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14 >>> eatlines("1\\n2", 3)
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15 ''
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16 >>> eatlines("1\\n2\\n3", 1)
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17 '2\\n3'
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18 """
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19 cs = cStringIO.StringIO(s)
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20
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21 for line in cs:
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22 n -= 1
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23 if n == 0:
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24 return cs.read()
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25 return ''
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27 def skiplines(s, prefix):
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28 """
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29 Skip lines starting with prefix in s
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30
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31 >>> skiplines('a\\nb\\na\\n', 'a')
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32 'b\\na\\n'
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33 >>> skiplines('a\\na\\n', 'a')
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34 ''
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35 >>> skiplines('', 'a')
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36 ''
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37 >>> skiplines('a\\nb', 'b')
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38 'a\\nb'
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39 """
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40 cs = cStringIO.StringIO(s)
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41
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42 for line in cs:
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43 if not line.startswith(prefix):
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44 return line + cs.read()
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45
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46 return ''
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47
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48 def cmdbuilder(name, *args, **kwargs):
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49 """
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50 A helper for building the command arguments
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51
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52 args are the positional arguments
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53
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54 kwargs are the options
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55 keys that are single lettered are prepended with '-', others with '--',
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56 underscores are replaced with dashes
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57
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58 keys with False boolean values are ignored, lists add the key multiple times
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59
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60 None arguments are skipped
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61
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62 >>> cmdbuilder('cmd', a=True, b=False, c=None)
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63 ['cmd', '-a']
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64 >>> cmdbuilder('cmd', long=True)
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65 ['cmd', '--long']
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66 >>> cmdbuilder('cmd', str='s')
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67 ['cmd', '--str', 's']
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68 >>> cmdbuilder('cmd', d_ash=True)
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69 ['cmd', '--d-ash']
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70 >>> cmdbuilder('cmd', _=True)
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71 ['cmd', '-']
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72 >>> cmdbuilder('cmd', list=[1, 2])
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73 ['cmd', '--list', '1', '--list', '2']
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74 >>> cmdbuilder('cmd', None)
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75 ['cmd']
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76 """
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77 cmd = [name]
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78 for arg, val in kwargs.items():
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79 if val is None:
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80 continue
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81
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82 arg = arg.replace('_', '-')
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83 if arg != '-':
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84 arg = '-' + arg if len(arg) == 1 else '--' + arg
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85 if isinstance(val, bool):
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86 if val:
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87 cmd.append(arg)
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88 elif isinstance(val, list):
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89 for v in val:
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90 cmd.append(arg)
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91 cmd.append(str(v))
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92 else:
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93 cmd.append(arg)
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94 cmd.append(str(val))
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95
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96 for a in args:
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97 if a is not None:
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98 cmd.append(a)
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99
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100 return cmd
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101
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102 class reterrorhandler(object):
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103 """
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104 This class is meant to be used with rawcommand() error handler argument.
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105 It remembers the return value the command returned if it's one of allowed
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106 values, which is only 1 if none are given. Otherwise it raises a CommandError.
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107
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108 >>> e = reterrorhandler('')
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109 >>> bool(e)
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110 True
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111 >>> e(1, 'a', '')
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112 'a'
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113 >>> bool(e)
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114 False
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115 """
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116 def __init__(self, args, allowed=None):
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117 self.args = args
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118 self.ret = 0
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119 if allowed is None:
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120 self.allowed = [1]
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121 else:
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122 self.allowed = allowed
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123
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124 def __call__(self, ret, out, err):
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125 self.ret = ret
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126 if ret not in self.allowed:
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127 raise error.CommandError(self.args, ret, out, err)
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128 return out
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129
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130 def __nonzero__(self):
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131 """ Returns True if the return code was 0, False otherwise """
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132 return self.ret == 0
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133
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134 class propertycache(object):
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135 """
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136 Decorator that remembers the return value of a function call.
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137
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138 >>> class obj(object):
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139 ... def func(self):
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140 ... print 'func'
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141 ... return []
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142 ... func = propertycache(func)
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143 >>> o = obj()
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144 >>> o.func
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145 func
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146 []
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147 >>> o.func
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148 []
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149 """
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150 def __init__(self, func):
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151 self.func = func
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152 self.name = func.__name__
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153 def __get__(self, obj, type=None):
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154 result = self.func(obj)
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155 setattr(obj, self.name, result)
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156 return result
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157
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158 close_fds = os.name == 'posix'
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159
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160 startupinfo = None
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161 if os.name == 'nt':
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162 startupinfo = subprocess.STARTUPINFO()
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163 startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
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164
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165 def popen(args, env={}):
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166 environ = None
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167 if env:
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168 environ = dict(os.environ)
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169 environ.update(env)
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170
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171 return subprocess.Popen(args, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
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172 stderr=subprocess.PIPE, close_fds=close_fds,
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173 startupinfo=startupinfo, env=environ)