Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/variables.py @ 79:a43749f751e0

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Put a copyright and license note into every source file of the configmix package
author Franz Glasner <hg@dom66.de>
date Wed, 14 Mar 2018 23:58:47 +0100
parents aa8345dae995
children 218807d7d883
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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 r"""
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7 configmix.variables
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8 ^^^^^^^^^^^^^^^^^^^
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9
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10 Variable expansion: namespaces and filters
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12 """
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13
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14 from __future__ import division, absolute_import, print_function
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15
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16 import os
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17 from functools import wraps
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18
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19 from .compat import PY2, text_to_native_os_str, native_os_str_to_text, u
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22 __all__ = []
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25 _MARKER = object()
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28 def _envlookup(name, default=_MARKER):
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29 """Lookup an environment variable"""
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30 try:
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31 return native_os_str_to_text(os.environ[name])
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32 except KeyError:
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33 if default is _MARKER:
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34 raise
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35 else:
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36 return default
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39 def _oslookup(name, default=_MARKER):
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40 """Lookup an environment variable"""
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41 if name == "cwd":
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42 return native_os_str_to_text(os.getcwd())
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43 raise KeyError("key %r not found in the namespace" % name)
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46 def _pylookup(name, default=_MARKER):
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47 """Lookup a Python specific variable"""
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48 import platform
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49 if name == "version":
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50 return u(platform.python_version())
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51 elif name == "implementation":
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52 return u(platform.python_implementation())
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53 elif name == "version_maj_min":
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54 t = platform.python_version_tuple()
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55 return u('.'.join(t[:2]))
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56 elif name == "version_maj":
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57 t = platform.python_version_tuple()
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58 return u(t[0])
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59 else:
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60 if default is _MARKER:
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61 raise KeyError("variable %r not found in namespace PY" % name)
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62 else:
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63 return default
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66 _varns_registry = {
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67 "ENV": _envlookup,
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68 "OS": _oslookup,
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69 "PY": _pylookup
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70 }
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73 def lookup_varns(name):
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74 return _varns_registry[_normalized(name)]
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77 _filter_registry = {}
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80 def add_filter(name, fn):
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81 _filter_registry[_normalized(name)] = fn
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82
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83
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84 def lookup_filter(name):
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85 return _filter_registry[_normalized(name)]
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86
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87
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88 def filter(name):
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89 """Decorator for a filter function"""
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90
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91 def _decorator(f):
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92
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93 @wraps(f)
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94 def _f(appconfig, v):
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95 return f(appconfig, v)
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96
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97 add_filter(name, _f)
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98 return _f
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99
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100 return _decorator
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101
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102
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103 def _normalized(name):
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104 return name.replace('-', '_')
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105
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106
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107 #
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108 # Some pre-defined filter functions
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109 #
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110 if PY2:
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111
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112 @filter("urlquote")
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113 def urlquote(config, v):
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114 """Replace all special characters in string using the ``%xx`` escape"""
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115 from urllib import quote
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116 return quote(v.encode("utf-8"), safe=b"").decode("utf-8")
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117
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118 else:
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119
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120 @filter("urlquote")
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121 def urlquote(config, v):
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122 """Replace all special characters in string using the ``%xx`` escape"""
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123 from urllib.parse import quote
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124 return quote(v, safe="")
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125
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126
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127 @filter("saslprep")
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128 def saslprep(config, v):
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129 """Do a `SASLprep` according to RFC4013 on `v`.
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130
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131 This is a Stringprep Profile for usernames and passwords
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132
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133 """
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134 import passlib.utils
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135 return passlib.utils.saslprep(v)
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138 @filter("normpath")
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139 def normpath_impl(config, v):
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140 return os.path.normpath(v)
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141
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142
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143 @filter("abspath")
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144 def abspath_impl(config, v):
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145 return os.path.abspath(v)
33
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146
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147
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148 @filter("posixpath")
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149 def posixpath_impl(config, v):
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150 return v.replace(u('\\'), u('/'))
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151
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152
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153 @filter("lower")
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154 def lower_impl(config, v):
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155 return v.lower()
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156
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157
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158 @filter("upper")
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159 def upper_impl(config, v):
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160 return v.upper()