Mercurial > libervia-backend

annotate src/tools/common/template.py @ 2309:c7a72b75232b

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jp (shell): shell command (REPL mode), first draft: This command launch jp in REPL mode, allowing do normal jp commands with some facilities. Command can be selected with "cmd" (e.g. "cmd blog"). An argument can be fixed with "use" (e.g. "use output fancy"). Command is launched with "do", or directly with its name if it doesn't conflict with a shell command. Arguments completion is still TODO (only shell commands are completed so far).
author Goffi <goffi@goffi.org>
date Thu, 06 Jul 2017 20:28:25 +0200
parents 084a75b8aa7a
children 2dae79990122
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rev   line source
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1 #!/usr/bin/env python2
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2016 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 """ template generation """
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21
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22 from sat.core.constants import Const as C
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23 from sat.core.i18n import _
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24 from sat.core import exceptions
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25 from sat.core.log import getLogger
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26 log = getLogger(__name__)
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27 import os.path
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28 from xml.sax.saxutils import quoteattr
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29 import time
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30 from babel import support
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31 from babel import Locale
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32 from babel.core import UnknownLocaleError
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33 try:
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34 import sat_templates
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35 except ImportError:
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36 raise exceptions.MissingModule(u'sat_templates module is not available, please install it or check your path to use template engine')
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37 else:
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38 sat_templates # to avoid pyflakes warning
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39
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40 try:
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41 import jinja2
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42 except:
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43 raise exceptions.MissingModule(u'Missing module jinja2, please install it from http://jinja.pocoo.org or with pip install jinja2')
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44
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45 from jinja2 import Markup as safe
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46
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47 HTML_EXT = ('html', 'xhtml')
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48 DEFAULT_LOCALE = u'en'
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49 # TODO: handle external path (an additional search path for templates should be settable by user
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50 # TODO: handle absolute URL (should be used for trusted use cases) only (e.g. jp) for security reason
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51
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52
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53 class TemplateLoader(jinja2.FileSystemLoader):
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54
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55 def __init__(self):
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56 searchpath = os.path.dirname(sat_templates.__file__)
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57 super(TemplateLoader, self).__init__(searchpath, followlinks=True)
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58
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59 def parse_template(self, template):
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60 """parse template path and return theme and relative URL
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61
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62 @param template_path(unicode): path to template with parenthesis syntax
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63 @return (tuple[(unicode,None),unicode]): theme and template_path
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64 theme can be None if relative path is used
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65 relative path is the path from search path with theme specified
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66 e.g. default/blog/articles.html
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67 """
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68 if template.startswith(u'('):
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69 try:
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70 theme_end = template.index(u')')
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71 except IndexError:
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72 raise ValueError(u"incorrect theme in template")
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73 theme = template[1:theme_end]
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74 template = template[theme_end+1:]
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75 if not template or template.startswith(u'/'):
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76 raise ValueError(u"incorrect path after template name")
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77 template = os.path.join(theme, template)
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78 elif template.startswith(u'/'):
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79 # absolute path means no template
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80 theme = None
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81 raise NotImplementedError(u'absolute path is not implemented yet')
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82 else:
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83 theme = C.TEMPLATE_THEME_DEFAULT
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84 template = os.path.join(theme, template)
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85 return theme, template
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86
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87 def get_default_template(self, theme, template_path):
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88 """return default template path
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89
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90 @param theme(unicode): theme used
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91 @param template_path(unicode): path to the not found template
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92 @return (unicode, None): default path or None if there is not
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93 """
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94 ext = os.path.splitext(template_path)[1][1:]
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95 path_elems = template_path.split(u'/')
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96 if ext in HTML_EXT:
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97 if path_elems[1] == u'error':
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98 # if an inexisting error page is requested, we return base page
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99 default_path = os.path.join(theme, u'error/base.html')
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100 return default_path
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101 if theme != C.TEMPLATE_THEME_DEFAULT:
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102 # if template doesn't exists for this theme, we try with default
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103 return os.path.join(C.TEMPLATE_THEME_DEFAULT, path_elems[1:])
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104
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105 def get_source(self, environment, template):
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106 """relative path to template dir, with special theme handling
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107
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108 if the path is just relative, "default" theme is used.
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109 The theme can be specified in parenthesis just before the path
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110 e.g.: (some_theme)path/to/template.html
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111 """
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112 theme, template_path = self.parse_template(template)
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113 try:
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114 return super(TemplateLoader, self).get_source(environment, template_path)
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115 except jinja2.exceptions.TemplateNotFound as e:
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116 # in some special cases, a defaut template is returned if nothing is found
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117 if theme is not None:
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118 default_path = self.get_default_template(theme, template_path)
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119 if default_path is not None:
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120 return super(TemplateLoader, self).get_source(environment, default_path)
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121 # if no default template is found, we re-raise the error
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122 raise e
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123
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124
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125 class Indexer(object):
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126 """Index global to a page"""
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127
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128 def __init__(self):
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129 self._idx = 0
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130
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131 def next(self):
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132 self._idx+=1
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133 return self._idx
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134
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135 def current(self):
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136 return self._idx
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137
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138
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139 class ScriptsHandler(object):
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140
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141 def __init__(self, renderer, template_path, template_root_dir, root_path):
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142 self.renderer = renderer
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143 self.template_root_dir = template_root_dir
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144 self.root_path = root_path
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145 self.scripts = [] # we don't use a set because order may be important
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146 dummy, self.theme, self.is_default_theme = renderer.getThemeData(template_path)
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147
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148 def include(self, library_name):
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149 """Mark that a script need to be imported.
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150
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151 Must be used before base.html is extended, as <script> are generated there.
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152 If called several time with the same library, it will be imported once.
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153 @param library_name(unicode): name of the library to import
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154 """
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155 if library_name.endswith('.js'):
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156 library_name = library_name[:-3]
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157 if library_name not in self.scripts:
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158 self.scripts.append(library_name)
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159 return u''
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160
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161 def generate_scripts(self):
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162 """Generate the <script> elements
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163
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164 @return (unicode): <scripts> HTML tags
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165 """
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166 scripts = []
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167 tpl = u'<script src={src}></script>'
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168 for library in self.scripts:
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169 path = self.renderer.getStaticPath(library, self.template_root_dir, self.theme, self.is_default_theme, '.js')
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170 if path is None:
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171 log.warning(_(u"Can't find {}.js javascript library").format(library))
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172 continue
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173 path = os.path.join(self.root_path, path)
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174 scripts.append(tpl.format(src=quoteattr(path)))
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175 return safe(u'\n'.join(scripts))
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176
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177
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178 class Renderer(object):
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179
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180 def __init__(self, host):
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181 self.host = host
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182 self.base_dir = os.path.dirname(sat_templates.__file__) # FIXME: should be modified if we handle use extra dirs
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183 self.env = jinja2.Environment(
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184 loader=TemplateLoader(),
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185 autoescape=jinja2.select_autoescape(['html', 'xhtml', 'xml']),
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186 trim_blocks=True,
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187 lstrip_blocks=True,
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188 extensions=['jinja2.ext.i18n'],
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189 )
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190 self._locale_str = DEFAULT_LOCALE
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191 self._locale = Locale.parse(self._locale_str)
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192 self.installTranslations()
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193 # we want to have access to SàT constants in templates
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194 self.env.globals[u'C'] = C
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195 # custom filters
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196 self.env.filters['next_gidx'] = self._next_gidx
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197 self.env.filters['cur_gidx'] = self._cur_gidx
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198 self.env.filters['date_days'] = self._date_days
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199
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200 def installTranslations(self):
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201 i18n_dir = os.path.join(self.base_dir, 'i18n')
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202 self.translations = {}
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203 for lang_dir in os.listdir(i18n_dir):
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204 lang_path = os.path.join(i18n_dir, lang_dir)
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205 if not os.path.isdir(lang_path):
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206 continue
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207 po_path = os.path.join(lang_path, 'LC_MESSAGES/sat.mo')
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208 try:
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209 with open(po_path, 'rb') as f:
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210 self.translations[Locale.parse(lang_dir)] = support.Translations(f, 'sat')
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211 except EnvironmentError:
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212 log.error(_(u"Can't find template translation at {path}").format(path = po_path))
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213 except UnknownLocaleError as e:
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214 log.error(_(u"Invalid locale name: {msg}").format(msg=e))
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215 else:
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216 log.info(_(u'loaded {lang} templates translations').format(lang=lang_dir))
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217 self.env.install_null_translations(True)
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218
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219 def setLocale(self, locale_str):
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220 if locale_str == self._locale_str:
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221 return
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222 locale = Locale.parse(locale_str)
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223 locale_str = unicode(locale)
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224 if locale_str != DEFAULT_LOCALE:
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225 try:
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226 translations = self.translations[locale]
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227 except KeyError:
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228 log.warning(_(u"Can't find locale {locale}".format(locale=locale)))
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229 locale_str = DEFAULT_LOCALE
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230 locale = Locale.parse(self._locale_str)
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231 else:
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232 self.env.install_gettext_translations(translations, True)
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233 log.debug(_(u'Switched to {lang}').format(lang=locale.english_name))
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234
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235 if locale_str == DEFAULT_LOCALE:
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236 self.env.install_null_translations(True)
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237
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238 self._locale = locale
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239 self._locale_str = locale_str
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240
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241 def getThemeAndRoot(self, template):
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242 """retrieve theme and root dir of a given tempalte
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243
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244 @param template(unicode): template to parse
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245 @return (tuple[unicode, unicode]): theme and absolute path to theme's root dir
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246 """
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247 theme, dummy = self.env.loader.parse_template(template)
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248 return theme, os.path.join(self.base_dir, theme)
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249
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250 def getStaticPath(self, name, template_root_dir, theme, is_default, ext='.css'):
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251 """retrieve path of a static file if it exists with current theme or default
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252
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253 File will be looked at [theme]/static/[name][ext], and then default
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254 if not found.
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255 @param name(unicode): name of the file to look for
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256 @param template_root_dir(unicode): absolute path to template root used
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257 @param theme(unicode): name of the template theme used
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258 @param is_default(bool): True if theme is the default theme
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259 @return (unicode, None): relative path if found, else None
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260 """
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261 file_ = None
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262 path = os.path.join(theme, C.TEMPLATE_STATIC_DIR, name + ext)
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263 if os.path.exists(os.path.join(template_root_dir, path)):
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diff changeset
264 file_ = path
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265 elif not is_default:
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diff changeset
266 path = os.path.join(C.TEMPLATE_THEME_DEFAULT, C.TEMPLATE_STATIC_DIR, name + ext)
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diff changeset
267 if os.path.exists(os.path.join(template_root_dir, path)):
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268 file_.append(path)
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269 return file_
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270
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271 def getThemeData(self, template_path):
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272 """return template data got from template_path
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273
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274 @return tuple(unicde, unicode, bool):
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275 path_elems: elements of the path
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276 theme: theme of the page
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277 is_default: True if the theme is the default theme
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278 """
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279 path_elems = template_path.split(u'/')
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280 theme = path_elems.pop(0)
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281 is_default = theme == C.TEMPLATE_THEME_DEFAULT
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282 return (path_elems, theme, is_default)
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283
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284 def getCSSFiles(self, template_path, template_root_dir):
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285 """retrieve CSS files to use according to theme and template path
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286
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287 for each element of the path, a .css file is looked for in /static, and returned if it exists.
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288 previous element are kept by replacing '/' with '_', and styles.css is always returned.
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289 For instance, if template_path is some_theme/blog/articles.html:
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290 some_theme/static/styles.css is returned if it exists else default/static/styles.css
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291 some_theme/static/blog.css is returned if it exists else default/static/blog.css (if it exists too)
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292 some_theme/static/blog_articles.css is returned if it exists else default/static/blog_articles.css (if it exists too)
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293 @param template_path(unicode): relative path to template file (e.g. some_theme/blog/articles.html)
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294 @param template_root_dir(unicode): absolute path of the theme root dir used
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295 @return list[unicode]: relative path to CSS files to use
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296 """
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297 # TODO: some caching would be nice
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298 css_files = []
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299 path_elems, theme, is_default = self.getThemeData(template_path)
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300 for css in (u'fonts', u'styles'):
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301 css_path = self.getStaticPath(css, template_root_dir, theme, is_default)
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302 if css_path is not None:
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303 css_files.append(css_path)
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304
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305 for idx, path in enumerate(path_elems):
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306 css_path = self.getStaticPath(u'_'.join(path_elems[:idx+1]), template_root_dir, theme, is_default)
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307 if css_path is not None:
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308 css_files.append(css_path)
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309
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310 return css_files
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311
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312 @jinja2.contextfilter
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313 def _next_gidx(self, ctx, value):
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314 """Use next current global index as suffix"""
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315 return u"{}_{}".format(value, ctx['gidx'].next())
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316
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317 @jinja2.contextfilter
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318 def _cur_gidx(self, ctx, value):
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319 """Use current current global index as suffix"""
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320 return u"{}_{}".format(value, ctx['gidx'].current())
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321
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322 def _date_days(self, timestamp):
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323 return int(time.time() - int(timestamp))/(3600*24)
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324
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325 def render(self, template, theme=None, locale=DEFAULT_LOCALE, root_path=u'', css_files=None, css_inline=False, **kwargs):
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326 """render a template
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327
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328 @param template(unicode): template to render (e.g. blog/articles.html)
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329 @param theme(unicode): template theme
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330 @param root_path(unicode): prefix of the path/URL to use for template root
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331 must end with a u'/'
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332 @param css_files(list[unicode],None): CSS files to used
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333 CSS files must be in static dir of the template
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334 use None for automatic selection of CSS files based on template category
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335 None is recommended. General static/style.css and theme file name will be used.
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336 @param css_inline(bool): if True, CSS will be embedded in the HTML page
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337 @param **kwargs: variable to transmit to the template
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338 """
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339 if not template:
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340 raise ValueError(u"template can't be empty")
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341 if theme is not None:
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342 # use want to set a theme, we add it to the template path
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343 if template[0] == u'(':
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344 raise ValueError(u"you can't specify theme in template path and in argument at the same time")
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345 elif template[0] == u'/':
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346 raise ValueError(u"you can't specify theme with absolute paths")
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347 template= u'(' + theme + u')' + template
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348 else:
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349 theme, dummy = self.env.loader.parse_template(template)
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350
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351 template_source = self.env.get_template(template)
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352 template_root_dir = os.path.normpath(self.base_dir) # FIXME: should be modified if we handle use extra dirs
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353 # XXX: template_path may have a different theme as first element than theme if a default page is used
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354 template_path = template_source.filename[len(template_root_dir)+1:]
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355
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356 if css_files is None:
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357 css_files = self.getCSSFiles(template_path, template_root_dir)
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358
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359 if css_inline:
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360 css_contents = []
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361 for css_file in css_files:
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362 css_file_path = os.path.join(template_root_dir, css_file)
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363 with open(css_file_path) as f:
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364 css_contents.append(f.read())
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365 if css_contents:
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366 kwargs['css_content'] = '\n'.join(css_contents)
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367
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368 scripts_handler = ScriptsHandler(self, template_path, template_root_dir, root_path)
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369 self.setLocale(locale)
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370 # XXX: theme used in template arguments is the requested theme, which may differ from actual theme
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371 # if the template doesn't exist in the requested theme.
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372 return template_source.render(theme=theme, root_path=root_path, css_files=css_files, locale=self._locale, gidx=Indexer(), script=scripts_handler, **kwargs)