Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/__init__.py @ 66:e78f307f81a0

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author Franz Glasner <f.glasner@feldmann-mg.com>
date Thu, 01 Mar 2018 11:22:47 +0100
parents 7dfcfc96f533
children b511c6d5dec2
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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 :License: BSD License.
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10 See LICENSE for details.
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11 :ID: $HGheader$
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12
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13 """
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15 from __future__ import division, print_function, absolute_import
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16
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17
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18 __version__ = "0.5"
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19
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20 __revision__ = "$Revision$"
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21
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22
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23 import copy
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24
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25 from .config import Configuration
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28 __all__ = ["load", "Configuration"]
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31 def load(*files):
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32 """Load the given configuration files, merge them in the given order
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33 and return the resulting :class:`configmix.config.Configuration` dictionary.
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34
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35 """
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36 if not files:
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37 return Configuration()
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38 else:
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39 ex = merge(None, _load_cfg_from_file(files[0]))
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40 for f in files:
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41 ex = merge(_load_cfg_from_file(f), ex)
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42 return Configuration(ex)
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45 def _load_cfg_from_file(filename):
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46 fnl = filename.lower()
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47 if fnl.endswith(".yml") or fnl.endswith("yaml"):
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48 from . import yaml
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49 with open(filename, "rb") as yf:
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50 return yaml.safe_load(yf)
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51 elif fnl.endswith(".py"):
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52 from . import py
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53 return py.load(filename)
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54 elif fnl.endswith(".ini"):
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55 from . import ini
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56 return ini.load(filename)
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57 else:
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58 raise ValueError("Unknown configuration file type for filename "
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59 "%r" % filename)
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61
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62 if 0:
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63 #
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64 # From: https://github.com/jet9/python-yconfig/blob/master/yconfig.py
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65 # License: BSD License
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66 #
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67 def dict_merge(a, b):
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68 """Recursively merges dict's. not just simple a['key'] = b['key'], if
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69 both a and bhave a key who's value is a dict then dict_merge is called
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70 on both values and the result stored in the returned dictionary."""
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71
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72 if not isinstance(b, dict):
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73 return b
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74 result = deepcopy(a)
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75 for k, v in b.iteritems():
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76 if k in result and isinstance(result[k], dict):
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77 result[k] = dict_merge(result[k], v)
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78 else:
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79 result[k] = deepcopy(v)
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80 return result
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82
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83 def merge(user, default, _first=True):
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84 """A simple (YAML-)tree merge.
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85
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86 From http://stackoverflow.com/questions/823196/yaml-merge-in-python
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87
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88 .. note:: `_first` is an internal argument.
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89
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90 """
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91 if _first and (user is None):
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92 return default
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93 if isinstance(user, dict) and isinstance(default, dict):
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94 for k, v in default.items():
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95 if k not in user:
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96 user[k] = v
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97 else:
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98 user[k] = merge(user[k], v, False)
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99 return user
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100
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101
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102 def safe_merge(user, default, _first=True):
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103 """A more safe version of :func:`merge()` that makes shallow copies of
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104 the returned container objects.
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105
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106 .. note:: `_first` is an internal argument.
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107
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108 """
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109 if _first and (user is None):
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110 return copy.copy(default)
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111 user = copy.copy(user)
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112 if isinstance(user, dict) and isinstance(default, dict):
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113 for k, v in default.items():
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114 if k not in user:
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115 user[k] = copy.copy(v)
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116 else:
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117 user[k] = merge(user[k], v, False)
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118 return user