Mercurial > hg > martINI

annotate martini/config.py @ 4:f7f335561ceb

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make special usage strings for each program; again, really should abstract this
author k0s <k0scist@gmail.com>
date Tue, 02 Mar 2010 20:27:25 -0500
parents 3c3522ce6e3a
children 09bed87f7fa4
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3c3522ce6e3a initial import of martINI from https://svn.openplans.org/svn/standalone/martINI/
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1 #!/usr/bin/env python
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2
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3 import os
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4 import sys
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5 import urllib2
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6
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7 from ConfigParser import ConfigParser
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8 from ConfigParser import InterpolationMissingOptionError
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9 from ConfigParser import MissingSectionHeaderError
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10 from ConfigParser import NoOptionError
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11 from StringIO import StringIO
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12
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13 def file_pointer(resource):
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14 """returns a file-like object given a string"""
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15 # XXX could go in utils.py
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16
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17 if not isinstance(resource, basestring):
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18 # assume resource is already a file-like object
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19 return resource
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20
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21 if os.path.exists(resource):
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22 return file(resource)
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23 if sum([resource.startswith(http) for http in 'http://', 'https://']):
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24 return urllib2.urlopen(resource)
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25 return StringIO(resource)
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26
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27
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28 class ConfigMunger(ConfigParser):
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29 """combine configuration from .ini files"""
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30
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31 def __init__(self, *conf, **kw):
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32 ConfigParser.__init__(self, kw.get('defaults',{}))
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33 self.read(*conf)
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34
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35 def __getitem__(self, section):
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36 """
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37 return an object with __getitem__ defined appropriately
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38 to allow referencing like self['foo']['bar']
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39 """
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40 return dict(self.items(section))
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41
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42 def get(self, section, option, default=None, raw=False, vars=None):
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43 try:
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44 value = ConfigParser.get(self, section, option, raw, vars)
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45 except NoOptionError:
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46 return default
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47 return value
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48
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49 def set(self, section, option, value):
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50 if section not in self.sections():
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51 self.add_section(section)
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52 ConfigParser.set(self, section, option, value)
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53
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54 def move_section(self, section, newname):
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55 if self.has_section(section):
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56 _section = self[section]
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57 self.remove_section(section)
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58 else:
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59 _section = {}
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60 self.read({newname: _section})
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61
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62 def dict(self):
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63 """return a dictionary of dictionaries;
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64 the outer with keys of section names;
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65 the inner with keys, values of the section"""
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66 return dict([(section, self[section])
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67 for section in self.sections()])
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68
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69 def read(self, *ini):
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70 for _ini in ini:
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71 if isinstance(_ini, dict):
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72 for section, contents in _ini.items():
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73 for option, value in contents.items():
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74 self.set(section, option, value)
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75 elif isinstance(_ini, list) or isinstance(_ini, tuple):
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76
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77 # ensure list or tuple of 3-tuples
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78 assert len([option for option in _ini
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79 if isinstance(option, tuple)
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80 and len(option) == 3])
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81
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82 for section, option, value in _ini:
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83 self.set(section, option, value)
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84 else:
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85 fp = file_pointer(_ini)
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86 try:
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87 self.readfp(fp)
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88 except MissingSectionHeaderError:
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89 fp.seek(0)
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90 fp = StringIO("[DEFAULTS]\n" + fp.read())
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91 self.readfp(fp)
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92
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93 def missing(self):
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94 """returns missing variable names"""
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95 missing = set()
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96
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97 for section in self.sections():
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98 for key, val in self.items(section, raw=True):
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99 try:
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100 self.get(section, key)
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101 except InterpolationMissingOptionError, e:
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102 missing.add(e.reference)
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103 return missing
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104
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105 def tuples(self):
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106 """
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107 return options in format appropriate to trac:
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108 [ (section, option, value) ]
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109 """
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110 options = []
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111 for section in self.sections():
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112 options.extend([(section,) + item
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113 for item in self.items(section)])
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114 return options
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115
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116 def write(self, fp=sys.stdout, raw=False, sorted=True, vars=None):
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117 sections = self.sections()
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118 if sorted:
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119 sections.sort()
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120
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121 for section in sections:
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122 print >> fp, '[%s]' % section
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123 options = self.options(section)
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124 if sorted:
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125 options.sort()
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126 for option in options:
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127 print >> fp, "%s = %s" % (option, self.get(section, option, raw, vars))
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128 if section != sections[-1]:
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129 print >> fp
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130
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131 if __name__ == '__main__':
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132 import sys
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133 from optparse import OptionParser
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134 parser = OptionParser()
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135 parser.add_option('--missing', action="store_true", default=False,
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136 help="list missing template variables")
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137 munger = ConfigMunger()
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138 options, args = parser.parse_args()
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139 munger.read(*args)
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140 if options.missing:
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141 for missing in munger.missing():
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142 print missing
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143 else:
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144 munger.write(sys.stdout)