Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/variables.py @ 44:b42e9936df2d

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Added "lower" and "upper" filters to make variable lower-case and upper-case
author Franz Glasner <f.glasner@feldmann-mg.com>
date Tue, 19 Apr 2016 12:25:34 +0200
parents 0e9f1f875ab0
children aa8345dae995
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1 # -*- coding: utf-8 -*-
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2 r"""Variable expansion: namespaces and filters
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3
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4 """
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5
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6 from __future__ import division, absolute_import, print_function
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7
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8 import os
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9 from functools import wraps
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10
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11 from .compat import PY2, text_to_native_os_str, native_os_str_to_text, u
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14 __all__ = []
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17 _MARKER = object()
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20 def _envlookup(name, default=_MARKER):
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21 """Lookup an environment variable"""
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22 try:
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23 return native_os_str_to_text(os.environ[name])
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24 except KeyError:
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25 if default is _MARKER:
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26 raise
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27 else:
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28 return default
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31 def _oslookup(name, default=_MARKER):
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32 """Lookup an environment variable"""
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33 if name == "cwd":
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34 return native_os_str_to_text(os.getcwd())
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35 raise KeyError("key %r not found in the namespace" % name)
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38 def _pylookup(name, default=_MARKER):
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39 """Lookup a Python specific variable"""
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40 import platform
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41 if name == "version":
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42 return u(platform.python_version())
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43 elif name == "implementation":
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44 return u(platform.python_implementation())
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45 elif name == "version_maj_min":
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46 t = platform.python_version_tuple()
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47 return u('.'.join(t[:2]))
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48 elif name == "version_maj":
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49 t = platform.python_version_tuple()
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50 return u(t[0])
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51 else:
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52 if default is _MARKER:
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53 raise KeyError("variable %r not found in namespace PY" % name)
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54 else:
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55 return default
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58 _varns_registry = {
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59 "ENV": _envlookup,
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60 "OS": _oslookup,
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61 "PY": _pylookup
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62 }
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65 def lookup_varns(name):
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66 return _varns_registry[_normalized(name)]
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69 _filter_registry = {}
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71
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72 def add_filter(name, fn):
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73 _filter_registry[_normalized(name)] = fn
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76 def lookup_filter(name):
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77 return _filter_registry[_normalized(name)]
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79
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80 def filter(name):
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81 """Decorator for a filter function"""
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82
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83 def _decorator(f):
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84
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85 @wraps(f)
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86 def _f(appconfig, v):
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87 return f(appconfig, v)
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88
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89 add_filter(name, _f)
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90 return _f
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91
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92 return _decorator
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93
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94
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95 def _normalized(name):
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96 return name.replace('-', '_')
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97
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98
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99 #
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100 # Some pre-defined filter functions
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101 #
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102 if PY2:
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103
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104 @filter("urlquote")
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105 def urlquote(config, v):
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106 """Replace all special characters in string using the ``%xx`` escape"""
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107 from urllib import quote
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108 return quote(v.encode("utf-8"), safe=b"").decode("utf-8")
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109
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110 else:
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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.parse import quote
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116 return quote(v, safe="")
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117
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118
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119 @filter("saslprep")
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120 def saslprep(config, v):
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121 """Do a `SASLprep` according to RFC4013 on `v`.
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122
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123 This is a Stringprep Profile for usernames and passwords
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124
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125 """
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126 import passlib.utils
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127 return passlib.utils.saslprep(v)
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128
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130 @filter("normpath")
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131 def normpath_impl(config, v):
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132 return os.path.normpath(v)
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135 @filter("abspath")
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136 def abspath_impl(config, v):
d70b58b0dfb9 A new variable namespace "OS" with a "cwd" function with new filters "abspath" and "normpath" for some minimal path manipulation
Franz Glasner <hg@dom66.de>
parents: 15
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137 return os.path.abspath(v)
33
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parents: 30
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138
3ee21f868440 Implement a "posixpath" filter to convert file path strings to use forward slashes.
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parents: 30
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139
3ee21f868440 Implement a "posixpath" filter to convert file path strings to use forward slashes.
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parents: 30
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140 @filter("posixpath")
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Franz Glasner <f.glasner@feldmann-mg.com>
parents: 30
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141 def posixpath_impl(config, v):
3ee21f868440 Implement a "posixpath" filter to convert file path strings to use forward slashes.
Franz Glasner <f.glasner@feldmann-mg.com>
parents: 30
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142 return v.replace(u('\\'), u('/'))
44
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parents: 43
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143
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parents: 43
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144
b42e9936df2d Added "lower" and "upper" filters to make variable lower-case and upper-case
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parents: 43
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145 @filter("lower")
b42e9936df2d Added "lower" and "upper" filters to make variable lower-case and upper-case
Franz Glasner <f.glasner@feldmann-mg.com>
parents: 43
diff changeset
146 def lower_impl(config, v):
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Franz Glasner <f.glasner@feldmann-mg.com>
parents: 43
diff changeset
147 return v.lower()
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parents: 43
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148
b42e9936df2d Added "lower" and "upper" filters to make variable lower-case and upper-case
Franz Glasner <f.glasner@feldmann-mg.com>
parents: 43
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149
b42e9936df2d Added "lower" and "upper" filters to make variable lower-case and upper-case
Franz Glasner <f.glasner@feldmann-mg.com>
parents: 43
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150 @filter("upper")
b42e9936df2d Added "lower" and "upper" filters to make variable lower-case and upper-case
Franz Glasner <f.glasner@feldmann-mg.com>
parents: 43
diff changeset
151 def upper_impl(config, v):
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Franz Glasner <f.glasner@feldmann-mg.com>
parents: 43
diff changeset
152 return v.upper()