Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/__init__.py @ 266:46571485b7d4

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Allow loading configuration files from directories when using the "<dir>" prefix in filenames. Unknown filetypes within these directories are ignored automatically.
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 10 Sep 2020 02:00:11 +0200
parents 39c379fa8c65
children d715c10f2930
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1 # -*- coding: utf-8 -*-
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2 """A library for helping with configuration files.
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3
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4 :Author: Franz Glasner
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5 :Copyright: (c) 2015–2020, Franz Glasner.
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6 All rights reserved.
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7 :License: 3-clause BSD License.
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8 See LICENSE.txt for details.
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9 :ID: @(#) $Header$
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11 """
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13 from __future__ import division, print_function, absolute_import
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15
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f62764292b9d +++++ v0.9
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16 __version__ = "0.9"
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17
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18 __revision__ = "|VCSRevision|"
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19 __date__ = "|VCSJustDate|"
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20
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21 __all__ = ["load", "safe_load",
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22 "set_assoc", "get_assoc", "clear_assoc",
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23 "get_default_assoc",
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24 "Configuration",
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25 "try_determine_filemode"]
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27
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28 import fnmatch
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29 import copy
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30 import io
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31 import os
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32 import re
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33
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34 from .compat import u, u2fs
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35 from .config import Configuration
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37
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38 COMMENTS = [
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39 u("__comment"),
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40 u("__doc"),
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41 ]
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42 """Prefixes for comment configuration keys that are to be handled as
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43 comments
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44
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45 """
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46
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47
172
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48 def load(*files, **kwargs):
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49 """Load the given configuration files, merge them in the given order
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50 and return the resulting configuration dictionary.
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51
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52 :param files: the filenames of the configuration files to read and merge
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53 :keyword defaults: optional configuration dictionary with some default
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54 settings where the settings from `files` are merged
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55 into
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56 :type defaults: dict-alike or None
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57 :keyword extras: optional configuration dictionary that will applied
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58 last
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60 Use this for example to overwrite configuration file
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61 settings from commandline arguments.
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62 :type extras: dict-alike or None
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63 :returns: the configuration
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64 :rtype: ~configmix.config.Configuration
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66 """
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67 defaults = kwargs.get("defaults")
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68 extras = kwargs.get("extras")
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69 if defaults is None:
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70 ex = Configuration()
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71 else:
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72 ex = merge(None, Configuration(defaults))
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73 for f in files:
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74 if f.startswith("<dir>"):
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75 for f2 in _get_configuration_files_from_dir(f[5:]):
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76 nx = _load_cfg_from_file(f2, ignore_unknown=True)
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77 if nx is not None:
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78 ex = merge(nx, ex)
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79 else:
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80 nx = _load_cfg_from_file(f)
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81 if nx is not None:
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82 ex = merge(nx, ex)
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83 if extras:
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84 ex = merge(Configuration(extras), ex)
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85 return Configuration(ex)
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87
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88 def safe_load(*files, **kwargs):
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89 """Analogous to :func:`load` but do merging with :func:`safe_merge`
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90 instead of :func:`merge`
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92 """
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93 defaults = kwargs.get("defaults")
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94 extras = kwargs.get("extras")
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95 if defaults is None:
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96 ex = Configuration()
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97 else:
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98 ex = safe_merge(None, Configuration(defaults))
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99 for f in files:
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100 if f.startswith("<dir>"):
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101 for f2 in _get_configuration_files_from_dir(f[5:]):
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102 nx = _load_cfg_from_file(f2, ignore_unknown=True)
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103 if nx is not None:
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104 ex = safe_merge(nx, ex)
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105 else:
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106 nx = _load_cfg_from_file(f)
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107 if nx is not None:
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108 ex = safe_merge(nx, ex)
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109 if extras:
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110 ex = safe_merge(Configuration(extras), ex)
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111 return Configuration(ex)
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113
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114 def _get_configuration_files_from_dir(root):
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115 """Returns the sorted list of files within directory `root`
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117 """
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118 files = []
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119
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120 if not os.path.isdir(root):
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121 return files
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122
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123 dirfiles = os.listdir(root)
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124 dirfiles.sort()
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125 for f in dirfiles:
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126 path = os.path.join(root, f)
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127 if os.path.isdir(path):
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128 # XXX TBD Recurse??? depth-first???
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129 continue
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130 files.append(path)
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131 return files
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132
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133
138
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134 def _load_yaml(filename):
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135 from . import yaml
166
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136 with open(u2fs(filename), "rb") as yf:
138
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137 return yaml.safe_load(yf)
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138
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139
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140 def _load_json(filename):
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141 from . import json
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142 return json.load(filename)
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143
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144
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145 def _load_py(filename):
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146 from . import py
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147 return py.load(filename)
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148
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149
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150 def _load_ini(filename):
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151 from . import ini
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152 return ini.load(filename)
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153
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154
195
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155 def _load_toml(filename):
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156 from . import toml
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157 return toml.load(filename)
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158
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159
227
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160 def _load_ignore(filename):
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161 """A loader that returns `None` just to ignore `filename`"""
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162 return None
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163
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164
180
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165 EMACS_MODELINE = re.compile(r"-\*-(.*?)-\*-")
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166 EMACS_MODE = re.compile(r"(?:\A\s*|;\s*)mode[:=]\s*([-_.a-zA-Z0-9]+)")
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167
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168
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169 def try_determine_filemode(filename):
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170 """Try to determine an explicitely given filemode from an Emacs-compatible
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171 mode declaration (e.g. ``mode=python``).
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172
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173 :param str filename:
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174 :return: the found mode string or `None`
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175 :rtype: str or None
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176
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diff changeset
177 Only the first two lines are searched for.
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178
206
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179 Conveniently to be used in calls to :func:`~.set_assoc` to determine
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180 the file-mode by content instead of filename extension.
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181
180
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182 """
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183 with io.open(filename, encoding="ascii", errors="replace") as f:
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diff changeset
184 idx = 0
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185 for l in f:
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186 idx += 1
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187 mo = EMACS_MODELINE.search(l)
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188 if mo:
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189 mo = EMACS_MODE.search(mo.group(1))
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diff changeset
190 if mo:
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191 return mo.group(1)
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192 if idx >= 2:
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diff changeset
193 break
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194 return None
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195
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diff changeset
196
178
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197 DEFAULT_MODE_LOADERS = {
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198 "python": _load_py,
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199 "yaml": _load_yaml,
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200 "conf": _load_ini,
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diff changeset
201 "conf-windows": _load_ini,
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202 "ini": _load_ini,
195
28e6c1413947 Added support for TOML style configuration files
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diff changeset
203 "toml": _load_toml,
197
7865f28038a4 Add the "conf-toml" mode mapping to the TOML loader
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diff changeset
204 "conf-toml": _load_toml,
178
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205 "javascript": _load_json,
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206 "json": _load_json,
228
b2c75efad9e4 Renamed the 'ignore' loader key to '-*-ignore-*-'
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diff changeset
207 "-*-ignore-*-": _load_ignore,
178
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diff changeset
208 }
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209 """Default associations between file modes and loader functions"""
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210
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diff changeset
211
181
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212 DEFAULT_ASSOC = [
178
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213 ("*.yml", "yaml"),
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214 ("*.yaml", "yaml"),
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215 ("*.json", "json"),
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216 ("*.py", "python"),
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217 ("*.ini", "conf"),
195
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diff changeset
218 ("*.toml", "toml"),
171
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219 ]
178
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220 """The builtin default associations of filename extensions with
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221 file modes -- in that order.
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222
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223 The "mode" part may be a string or a callable with a filename
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224 parameter that returns the mode string for the file or `None` if it
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diff changeset
225 can not determined.
171
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diff changeset
226
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diff changeset
227 """
139
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228
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229
188
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diff changeset
230 USE_DEFAULT_ASSOC = object()
181
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diff changeset
231 """Marker for the default association for an extension.
139
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diff changeset
232
181
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diff changeset
233 To be used in :func:`set_assoc`.
139
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234 """
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235
181
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diff changeset
236
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diff changeset
237 def get_default_assoc(pattern):
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238 """Return the default file-mode association for the :mod:`fnmatch`
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239 pattern `pattern`.
171
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diff changeset
240
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241 :raises: :class:`KeyError` if the `pattern` is not found.
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242
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243 """
181
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diff changeset
244 for pat, fmode in DEFAULT_ASSOC:
171
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diff changeset
245 if pattern == pat:
181
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diff changeset
246 return fmode
171
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diff changeset
247 else:
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248 raise KeyError("No loader for pattern %r" % pattern)
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249
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250
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251 mode_loaders = {}
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252 """All configured associations between file modes and loader functions.
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253
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254 See :data:`DEFAULT_MODE_LOADERS`.
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255
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256 """
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257
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258 _extensions = []
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259 """All configured assiciations of filename extensions with file modes.
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260
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261 See :data:`DEFAULT_ASSOC`
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262
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263 """
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264
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265
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266 def clear_assoc():
139
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267 """Remove all configured loader associations.
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268
187
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269 The :data:`.DEFAULT_ASSOC` are **not** changed.
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270
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271 """
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272 del _extensions[:]
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273
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274
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275 def get_assoc(pattern):
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276 """Return the default loader for the :mod:`fnmatch` pattern `pattern`.
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277
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278 :raises: :class:`KeyError` if the `pattern` is not found.
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279
171
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280 """
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281 for pat, fmode in _extensions:
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282 if pattern == pat:
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283 return fmode
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284 else:
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285 raise KeyError("No associated file-mode for pattern %r" % pattern)
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286
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287
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288 def set_assoc(fnpattern, mode, append=False):
179
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289 """Associate a :mod:`fnmatch` style pattern `fnpattern` with a
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290 file-mode `mode` that determines what will be called when
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291 :func:`load` encounters a file argument that matches `fnpattern`.
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292
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293 :param str fnpattern: the :mod:`fnmatch` pattern to associate a loader
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294 with
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295 :param mode: a mode string or a callable that accepts a `filename`
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296 argument and returns a file-mode for the given file
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297 (or `None`)
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298 :type mode: str or callable
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299
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300 :keyword bool append: If `False` (which is the default) then this
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301 function inserts the given pattern at the head position of the
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302 currently defined associations, if `True` the pattern will be appended
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303
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304 The OS specific case-sensitivity behaviour of
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305 :func:`fnmatch.fnmatch` applies (i.e. :func:`os.path.normpath`
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306 will be called for both arguments).
141
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307
188
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308 If `loader` is :data:`.USE_DEFAULT_ASSOC` then the default association
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309 from :data:`.DEFAULT_ASSOC` will be used -- if any.
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310
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311 """
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312 if mode is USE_DEFAULT_ASSOC:
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313 for p, m in DEFAULT_ASSOC:
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314 if p == fnpattern:
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315 if append:
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316 _extensions.append((fnpattern, m))
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317 else:
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318 _extensions.insert(0, (fnpattern, m))
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319 break
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320 else:
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321 raise ValueError("no DEFAULT mode for pattern: %r" % fnpattern)
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322 else:
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323 if append:
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324 _extensions.append((fnpattern, mode))
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325 else:
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326 _extensions.insert(0, (fnpattern, mode))
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327
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328
266
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329 def _load_cfg_from_file(filename, ignore_unknown=False):
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330 """Determine the loader for file `filename` and return the loaded
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331 configuration dict.
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332
266
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333 If `ignore_unknown` is `True` then unknown extensions are ignored.
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334 Otherwise a :exc:`ValueError` exception is raised.
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335
227
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336 Can return `None` is the file should be ignored by the caller.
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337
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338 """
178
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339 for p, m in _extensions:
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340 if fnmatch.fnmatch(filename, p):
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341 if callable(m):
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342 m = m(filename)
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343 if m is None:
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344 continue
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345 return mode_loaders[m](filename)
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346 else:
266
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347 if ignore_unknown:
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348 return None
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349 else:
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350 raise ValueError("Unknown configuration file type for filename "
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351 "%r" % filename)
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352
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353
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354 if 0:
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355 #
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356 # From: https://github.com/jet9/python-yconfig/blob/master/yconfig.py
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357 # License: BSD License
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358 #
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359 def dict_merge(a, b):
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360 """Recursively merges dict's. not just simple a['key'] = b['key'], if
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361 both a and bhave a key who's value is a dict then dict_merge is called
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362 on both values and the result stored in the returned dictionary."""
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363
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364 if not isinstance(b, dict):
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365 return b
207
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366 result = deepcopy(a) # noqa
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367 for k, v in b.iteritems():
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368 if k in result and isinstance(result[k], dict):
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369 result[k] = dict_merge(result[k], v)
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370 else:
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371 result[k] = deepcopy(v) # noqa
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372 return result
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373
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374
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375 def merge(user, default, filter_comments=True):
110
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376 """Logically merge the configuration in `user` into `default`.
98
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377
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378 :param ~configmix.config.Configuration user:
110
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379 the new configuration that will be logically merged
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380 into `default`
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381 :param ~configmix.config.Configuration default:
110
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382 the base configuration where `user` is logically merged into
144
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383 :param bool filter_comments: flag whether to filter comment keys that
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384 start with any of the items in :data:`COMMENTS`
110
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385 :returns: `user` with the necessary amendments from `default`.
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386 If `user` is ``None`` then `default` is returned.
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387
144
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diff changeset
388 .. note:: The configuration in `user` is augmented/changed
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389 **inplace**.
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390
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diff changeset
391 The configuration in `default` will be changed **inplace**
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392 when filtering out comments (which is the default).
8
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393
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394 From http://stackoverflow.com/questions/823196/yaml-merge-in-python
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395
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396 """
110
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397 if user is None:
144
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398 if filter_comments:
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399 _filter_comments(default)
13
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400 return default
144
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401 if filter_comments:
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402 _filter_comments(user)
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403 if isinstance(user, dict) and isinstance(default, dict):
9
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404 for k, v in default.items():
144
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405 if filter_comments and _is_comment(k):
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406 continue
8
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407 if k not in user:
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408 user[k] = v
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409 else:
144
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410 user[k] = _merge(user[k], v, filter_comments)
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411 return user
10
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412
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413
144
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414 def _merge(user, default, filter_comments):
110
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415 """Recursion helper for :meth:`merge`
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416
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417 """
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418 if isinstance(user, dict) and isinstance(default, dict):
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419 for k, v in default.items():
144
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420 if filter_comments and _is_comment(k):
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diff changeset
421 continue
110
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422 if k not in user:
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423 user[k] = v
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424 else:
144
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425 user[k] = _merge(user[k], v, filter_comments)
110
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426 return user
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diff changeset
427
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428
144
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diff changeset
429 def safe_merge(user, default, filter_comments=True):
111
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430 """A more safe version of :func:`merge` that makes deep copies of
13
24ba462b9b4b Return the `default' argument when the given `user' argument is `None' and when it is the first call on merge
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diff changeset
431 the returned container objects.
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432
144
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433 Contrary to :func:`merge` no given argument is ever changed
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diff changeset
434 inplace. Every object from `default` is decoupled from the result
165
6ca90e80f4f4 FIX: Docu: wording
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435 -- so changing the `default` configuration later does not propagate
144
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diff changeset
436 into a merged configuration later.
111
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diff changeset
437
10
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438 """
110
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439 if user is None:
144
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440 if filter_comments:
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441 _filter_comments(default)
111
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442 return copy.deepcopy(default)
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443 user = copy.deepcopy(user)
144
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444 if filter_comments:
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445 _filter_comments(user)
10
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446 if isinstance(user, dict) and isinstance(default, dict):
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447 for k, v in default.items():
144
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448 if filter_comments and _is_comment(k):
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diff changeset
449 continue
10
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diff changeset
450 if k not in user:
111
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451 user[k] = copy.deepcopy(v)
10
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diff changeset
452 else:
144
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diff changeset
453 user[k] = _safe_merge(user[k], v, filter_comments)
10
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diff changeset
454 return user
111
d51a18e5b0e3 Reimplement configmix.safe_merge() do to a deepcopy of all source configurations when merging.
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diff changeset
455
d51a18e5b0e3 Reimplement configmix.safe_merge() do to a deepcopy of all source configurations when merging.
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diff changeset
456
144
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diff changeset
457 def _safe_merge(user, default, filter_comments):
111
d51a18e5b0e3 Reimplement configmix.safe_merge() do to a deepcopy of all source configurations when merging.
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diff changeset
458 """Recursion helper for :meth:`safe_merge`
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diff changeset
459
d51a18e5b0e3 Reimplement configmix.safe_merge() do to a deepcopy of all source configurations when merging.
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diff changeset
460 """
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diff changeset
461 if isinstance(user, dict) and isinstance(default, dict):
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diff changeset
462 for k, v in default.items():
144
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diff changeset
463 if filter_comments and _is_comment(k):
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diff changeset
464 continue
111
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diff changeset
465 if k not in user:
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diff changeset
466 user[k] = copy.deepcopy(v)
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diff changeset
467 else:
144
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diff changeset
468 user[k] = _safe_merge(user[k], v, filter_comments)
111
d51a18e5b0e3 Reimplement configmix.safe_merge() do to a deepcopy of all source configurations when merging.
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diff changeset
469 return user
139
c87b0dc54e1d Allow custom configuration filename extensions and custom loaders that can handle custom configuration file syntax styles
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diff changeset
470
c87b0dc54e1d Allow custom configuration filename extensions and custom loaders that can handle custom configuration file syntax styles
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diff changeset
471
144
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diff changeset
472 def _filter_comments(d):
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diff changeset
473 """Recursively filter comments keys in the dict `d`.
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diff changeset
474
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diff changeset
475 Comment keys are keys that start with any of the items in
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diff changeset
476 :data:`COMMENTS`.
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diff changeset
477
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diff changeset
478 """
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diff changeset
479 if not isinstance(d, dict):
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diff changeset
480 return
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diff changeset
481 # use a copy of the keys because we change `d` while iterating
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diff changeset
482 for k in list(d.keys()):
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diff changeset
483 if _is_comment(k):
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diff changeset
484 del d[k]
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diff changeset
485 else:
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diff changeset
486 if isinstance(d[k], dict):
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diff changeset
487 _filter_comments(d[k])
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diff changeset
488
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diff changeset
489
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diff changeset
490 def _is_comment(k):
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diff changeset
491 for i in COMMENTS:
256
7e26d31f52de FIX: Allow non-text keys when merging: handle .startswith() errors gracefully
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parents: 253
diff changeset
492 try:
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diff changeset
493 if k.startswith(i):
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diff changeset
494 return True
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diff changeset
495 except AttributeError:
7e26d31f52de FIX: Allow non-text keys when merging: handle .startswith() errors gracefully
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diff changeset
496 # non-string key
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diff changeset
497 return False
144
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diff changeset
498 return False
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diff changeset
499
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parents: 141
diff changeset
500
139
c87b0dc54e1d Allow custom configuration filename extensions and custom loaders that can handle custom configuration file syntax styles
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diff changeset
501 #
178
eeb3ed104ea1 Begin refactoring the associations between filename extensions and loader functions:
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diff changeset
502 # Init loader defaults: mode->loader and extension->mode
139
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diff changeset
503 #
189
0d0980ed74cc Rename the "_mode_loaders" variable to "mode_loaders" and make is therefore a "public" item
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parents: 188
diff changeset
504 mode_loaders.update(DEFAULT_MODE_LOADERS)
181
7cfdc972af42 Refactor: Renamed public functions to be conform with the new loader search
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parents: 180
diff changeset
505 for _pattern, _mode in DEFAULT_ASSOC:
7cfdc972af42 Refactor: Renamed public functions to be conform with the new loader search
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parents: 180
diff changeset
506 set_assoc(_pattern, _mode)