Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/__init__.py @ 73:6216c561532a

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Put a Copyright and License notice into the package's __init__.py
author Franz Glasner <hg@dom66.de>
date Fri, 02 Mar 2018 01:48:11 +0100
parents b511c6d5dec2
children 3a8f712d27df
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1 # -*- coding: utf-8 -*-
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2 r"""
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3 configmix
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4 ^^^^^^^^^
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5
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6 A library for helping with configuration files.
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7
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8 :Author: Franz Glasner
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9 :Copyright: Copyright (c) 2015-2018, Franz Glasner.
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10 All rights reserved.
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11 :License: BSD 3-Clause License.
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12 See LICENSE.txt for details.
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13 :ID: $Header$
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14
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15 """
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16
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17 from __future__ import division, print_function, absolute_import
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18
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19
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20 __version__ = "0.5"
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21
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22 __revision__ = "$Revision$"
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23
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25 import copy
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26
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27 from .config import Configuration
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30 __all__ = ["load", "Configuration"]
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32
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33 def load(*files):
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34 """Load the given configuration files, merge them in the given order
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35 and return the resulting :class:`configmix.config.Configuration` dictionary.
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36
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37 """
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38 if not files:
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39 return Configuration()
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40 else:
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41 ex = merge(None, _load_cfg_from_file(files[0]))
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42 for f in files:
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43 ex = merge(_load_cfg_from_file(f), ex)
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44 return Configuration(ex)
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47 def _load_cfg_from_file(filename):
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48 fnl = filename.lower()
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49 if fnl.endswith(".yml") or fnl.endswith("yaml"):
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50 from . import yaml
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51 with open(filename, "rb") as yf:
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52 return yaml.safe_load(yf)
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53 elif fnl.endswith(".py"):
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54 from . import py
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55 return py.load(filename)
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56 elif fnl.endswith(".ini"):
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57 from . import ini
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58 return ini.load(filename)
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59 else:
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60 raise ValueError("Unknown configuration file type for filename "
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61 "%r" % filename)
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63
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64 if 0:
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65 #
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66 # From: https://github.com/jet9/python-yconfig/blob/master/yconfig.py
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67 # License: BSD License
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68 #
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69 def dict_merge(a, b):
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70 """Recursively merges dict's. not just simple a['key'] = b['key'], if
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71 both a and bhave a key who's value is a dict then dict_merge is called
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72 on both values and the result stored in the returned dictionary."""
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74 if not isinstance(b, dict):
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75 return b
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76 result = deepcopy(a)
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77 for k, v in b.iteritems():
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78 if k in result and isinstance(result[k], dict):
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79 result[k] = dict_merge(result[k], v)
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80 else:
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81 result[k] = deepcopy(v)
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82 return result
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84
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85 def merge(user, default, _first=True):
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86 """A simple (YAML-)tree merge.
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87
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88 From http://stackoverflow.com/questions/823196/yaml-merge-in-python
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89
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90 .. note:: `_first` is an internal argument.
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91
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92 """
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93 if _first and (user is None):
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94 return default
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95 if isinstance(user, dict) and isinstance(default, dict):
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96 for k, v in default.items():
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97 if k not in user:
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98 user[k] = v
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99 else:
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100 user[k] = merge(user[k], v, False)
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101 return user
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102
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103
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104 def safe_merge(user, default, _first=True):
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105 """A more safe version of :func:`merge()` that makes shallow copies of
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106 the returned container objects.
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107
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108 .. note:: `_first` is an internal argument.
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109
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110 """
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111 if _first and (user is None):
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112 return copy.copy(default)
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113 user = copy.copy(user)
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114 if isinstance(user, dict) and isinstance(default, dict):
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115 for k, v in default.items():
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116 if k not in user:
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117 user[k] = copy.copy(v)
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118 else:
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119 user[k] = merge(user[k], v, False)
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120 return user