Mercurial > hg > decoupage

annotate decoupage/web.py @ 20:c17595c824a7

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try to fail gracefully if index.html exists
author egj@egj-laptop
date Sun, 03 Jan 2010 15:36:14 -0500
parents 8923fda80bd4
children 64ae0d2f402b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """
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2 decoupage: a view with webob
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3 """
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4
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5 import os
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6
10
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7 from formatters import formatters
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8
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9 from genshi.builder import Markup
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10 from genshi.template import TemplateLoader
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11 from martini.config import ConfigMunger
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12 from paste.fileapp import FileApp
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13 from pkg_resources import resource_filename
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14 from pkg_resources import iter_entry_points
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15 from webob import Request, Response, exc
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17 class Decoupage(object):
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19 ### class level variables
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20 defaults = { 'auto_reload': 'False',
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21 'configuration': None,
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22 'directory': None, # directory to serve
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23 'cascade': 'True', # whether to cascade configuration
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24 'template': 'index.html', # XXX see below
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25 'template_directories': '' # list of directories to look for templates
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26 }
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27
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28 def __init__(self, **app_conf):
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30 # set defaults from app configuration
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31 kw = self.app_conf('decoupage', app_conf)
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32 for key in self.defaults:
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33 setattr(self, key, kw.get(key, self.defaults[key]))
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34
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35 # configure defaults
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36 self.auto_reload = self.auto_reload.lower() == 'true'
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37 self.cascade = self.cascade.lower() == 'true'
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38 self.directory = self.directory.rstrip(os.path.sep)
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39 assert os.path.isdir(self.directory)
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40 self.template_directories = self.template_directories.split() # no spaces in directory names, for now
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41 assert sum([os.path.isdir(directory) for directory in self.template_directories]) == len(self.template_directories)
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42
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43 # static file server
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44 self.fileserver = FileApp
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45
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46 # pluggable index data formatters
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47 self.formatters = {}
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48 for formatter in iter_entry_points('decoupage.formatters'):
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49 try:
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50 _formatter = formatter.load()
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51 template_dir = resource_filename(formatter.module_name, 'templates')
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52 if template_dir not in self.template_directories and os.path.isdir(template_dir):
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53 self.template_directories.append(template_dir)
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54 except:
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55 continue # XXX should probably raise
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56 self.formatters[formatter.name] = _formatter
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57
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58 # template loader
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59 self.loader = TemplateLoader(self.template_directories,
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60 auto_reload=self.auto_reload)
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61
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62 ### methods dealing with HTTP
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63 def __call__(self, environ, start_response):
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64 request = Request(environ)
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65 filename = request.path_info.strip('/')
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66 path = os.path.join(self.directory, filename)
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67 if os.path.exists(path):
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68 if os.path.isdir(path):
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69
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70 if not request.path_info.endswith('/'):
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71 raise exc.HTTPMovedPermanently(add_slash=True)
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72
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73 res = self.get(request)
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74 return res(environ, start_response)
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75 else:
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76 fileserver = self.fileserver(path)
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77 return fileserver(environ, start_response)
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78 else:
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79 raise exc.HTTPNotFound()
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80
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81 def get_response(self, text, content_type='text/html'):
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82 """construct a response to a GET request"""
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83 res = Response(content_type=content_type, body=text)
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84 return res
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85
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86 def get(self, request):
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87 """
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88 return response to a GET requst
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89 """
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90 # ensure a sane path
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91 path = request.path_info.strip('/')
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92 directory = os.path.join(self.directory, path)
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93 path = '/%s' % path
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94
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95 # get the configuraton
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96 conf = self.conf(path)
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97
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98 # build data dictionary
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9f91acf9874c * split on space in formatters to be consist with everything else
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99 files = self.filedata(path, directory, conf)
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100 data = {'path': path, 'files': files, 'request': request }
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101 data['title'] = conf.get('/title')
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8923fda80bd4 misspelling
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102 data['directory'] = directory
14
4ca2530f8be1 stub for putting stylesheets and includes on templates"
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103 data['include'] = None
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104 data['css'] = ()
0
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105
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106 # apply formatters
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107 # XXX this should be cached if not self.auto_reload
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108 if '/formatters' in conf:
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109 # ordered list of formatters to be applied first
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110 formatters = [ i for i in conf['/formatters'].split()
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111 if i in self.formatters ]
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112 else:
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113 formatters = []
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114 for key in conf:
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115 if key.startswith('/'):
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116 key = key[1:]
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117 if key in self.formatters and key not in formatters:
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118 formatters.append(key)
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119 for name in formatters:
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120 formatter = self.formatters[name](conf.get('/%s' % name, ''))
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121 formatter(request, data)
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122
0
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123 # render the template
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124 template = conf.get('/template')
20
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125 local_index = False
0
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126 if template is None:
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127 if 'index.html' in [ f['name'] for f in files ]:
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128 local_index = os.path.join(directory, 'index.html')
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129 template = local_index
0
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130 else:
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131 template = self.template
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132 else:
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133 if not os.path.isabs(template):
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134 _template = os.path.join(directory, template)
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135 if os.path.exists(_template):
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136 template = _template
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137 else:
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138 for directory in self.template_directories:
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139 if template in os.listdir(directory):
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140 break
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141 else:
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142 raise IOError("template %s not found" % template)
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143
0
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144 template = self.loader.load(template)
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145 try:
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146 res = template.generate(**data).render('html', doctype='html')
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147 except TemplateSyntaxError:
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148 if local_index:
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149 return self.fileserver(local_index)
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150 raise
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151
0
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152 return self.get_response(res)
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153
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154 ### internal methods
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155
12
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156 def filedata(self, path, directory, conf):
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157 files = []
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158 for i in os.listdir(directory):
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159 files.append({'path' : '%s/%s' % (path.rstrip('/'), i),
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160 'name': i,
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161 'description': conf.get(i.lower(), None)})
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162 return files
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163
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164 def conf(self, path, cascade=None):
0
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165 """returns configuration dictionary appropriate to a path"""
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166 if cascade is None:
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167 cascase = self.cascade
0
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168
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169 directory = os.path.join(self.directory, path.strip('/'))
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170 if path.strip('/'):
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171 path_tuple = tuple(path.strip('/').split('/'))
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172 else:
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173 path_tuple = ()
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174
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175 # return cached configuration
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176 if hasattr(self, '_conf') and path_tuple in self._conf:
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177 return self._conf[path_tuple]
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178
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179 conf = {}
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180
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181 # local configuration
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182 ini_path = os.path.join(directory, 'index.ini')
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183 if os.path.exists(ini_path):
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184 _conf = ConfigMunger(ini_path).dict()
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185 if len(_conf) == 1:
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186 conf = _conf[_conf.keys()[0]].copy()
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187
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188 # global configuration
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189 if not conf and self.configuration and os.path.exists(self.configuration):
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190 conf = ConfigMunger(self.configuration).dict().get('/%s' % path.rstrip('/'), {})
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191
10
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192 # inherit and cascade configuration
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193 inherit_directory = None
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194 if '/inherit' in conf:
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195 inherit_directory = conf['/inherit']
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196 elif self.cascade and path_tuple:
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197 inherit_directory = '/%s' % '/'.join(path_tuple[:-1])
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198 if inherit_directory:
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199 parent_configuration = self.conf(inherit_directory)
0
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200 for key, value in parent_configuration.items():
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201 if key.startswith('/') and key not in conf:
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202 conf[key] = value
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203
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204 # cache configuration
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205 if not self.auto_reload:
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206 if not hasattr(self, '_conf'):
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207 self._conf = {}
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208 self._conf[path_tuple] = conf
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209
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210 return conf
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211
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212 def fmtrs(self, path):
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213 formatters = []
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214 for key, value in self.conf(path).items():
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215 if key.startswith('/'):
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216 key = key[1:]
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217 if key in self.formatters:
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218 formatter = self.formatters[key](value)
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219
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220
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221 def app_conf(self, keystr, app_conf):
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222 keystr += '.'
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223 return dict([(key.split(keystr, 1)[-1], value)
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224 for key, value in app_conf.items()
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225 if key.startswith(keystr) ])