Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/variables.py @ 89:35ce96a3150e

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author Franz Glasner <hg@dom66.de>
date Sat, 17 Mar 2018 13:20:42 +0100
parents 218807d7d883
children cd6c5c1494f5
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1 # -*- coding: utf-8 -*-
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2 #-
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3 # :Copyright: (c) 2015-2018, Franz Glasner. All rights reserved.
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4 # :License: 3-clause BSD. See LICENSE.txt for details.
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5 #-
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6 """Variable expansion: namespaces and filters
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8 """
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9
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10 from __future__ import division, absolute_import, print_function
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11
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12 import os
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13 from functools import wraps
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14
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15 from .compat import PY2, text_to_native_os_str, native_os_str_to_text, u
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18 __all__ = []
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20
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21 _MARKER = object()
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24 def _envlookup(name, default=_MARKER):
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25 """Lookup an environment variable"""
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26 try:
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27 return native_os_str_to_text(os.environ[name])
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28 except KeyError:
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29 if default is _MARKER:
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30 raise
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31 else:
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32 return default
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35 def _oslookup(name, default=_MARKER):
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36 """Lookup an environment variable"""
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37 if name == "cwd":
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38 return native_os_str_to_text(os.getcwd())
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39 raise KeyError("key %r not found in the namespace" % name)
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42 def _pylookup(name, default=_MARKER):
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43 """Lookup a Python specific variable"""
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44 import platform
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45 if name == "version":
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46 return u(platform.python_version())
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47 elif name == "implementation":
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48 return u(platform.python_implementation())
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49 elif name == "version_maj_min":
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50 t = platform.python_version_tuple()
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51 return u('.'.join(t[:2]))
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52 elif name == "version_maj":
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53 t = platform.python_version_tuple()
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54 return u(t[0])
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55 else:
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56 if default is _MARKER:
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57 raise KeyError("variable %r not found in namespace PY" % name)
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58 else:
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59 return default
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62 _varns_registry = {
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63 "ENV": _envlookup,
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64 "OS": _oslookup,
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65 "PY": _pylookup
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66 }
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69 def lookup_varns(name):
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70 return _varns_registry[_normalized(name)]
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73 _filter_registry = {}
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76 def add_filter(name, fn):
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77 _filter_registry[_normalized(name)] = fn
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80 def lookup_filter(name):
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81 return _filter_registry[_normalized(name)]
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83
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84 def filter(name):
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85 """Decorator for a filter function"""
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86
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87 def _decorator(f):
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88
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89 @wraps(f)
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90 def _f(appconfig, v):
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91 return f(appconfig, v)
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92
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93 add_filter(name, _f)
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94 return _f
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95
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96 return _decorator
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97
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98
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99 def _normalized(name):
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100 return name.replace('-', '_')
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101
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102
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103 #
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104 # Some pre-defined filter functions
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105 #
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106 if PY2:
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107
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108 @filter("urlquote")
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109 def urlquote(config, v):
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110 """Replace all special characters in string using the ``%xx`` escape"""
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111 from urllib import quote
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112 return quote(v.encode("utf-8"), safe=b"").decode("utf-8")
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113
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114 else:
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115
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116 @filter("urlquote")
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117 def urlquote(config, v):
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118 """Replace all special characters in string using the ``%xx`` escape"""
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119 from urllib.parse import quote
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120 return quote(v, safe="")
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121
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122
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123 @filter("saslprep")
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124 def saslprep(config, v):
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125 """Do a `SASLprep` according to :rfc:`4013` on `v`.
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126
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127 This is a Stringprep Profile for usernames and passwords
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128
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129 """
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130 import passlib.utils
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131 return passlib.utils.saslprep(v)
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134 @filter("normpath")
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135 def normpath_impl(config, v):
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136 return os.path.normpath(v)
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137
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138
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139 @filter("abspath")
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140 def abspath_impl(config, v):
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141 return os.path.abspath(v)
33
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142
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143
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144 @filter("posixpath")
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145 def posixpath_impl(config, v):
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146 return v.replace(u('\\'), u('/'))
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147
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148
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149 @filter("lower")
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150 def lower_impl(config, v):
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151 return v.lower()
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152
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153
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154 @filter("upper")
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155 def upper_impl(config, v):
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156 return v.upper()