Mercurial > libervia-backend

annotate src/tools/common/template.py @ 2260:45b89d7c5c81

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jp (invitation): fixed inconsistency in language handling
author Goffi <goffi@goffi.org>
date Wed, 21 Jun 2017 08:00:14 +0200
parents e572482f6cbd
children 322694543225
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 collections import OrderedDict
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29 from xml.sax.saxutils import quoteattr
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30 import time
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31 from babel import support
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32 from babel import Locale
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33 from babel.core import UnknownLocaleError
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34 try:
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35 import sat_templates
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36 except ImportError:
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37 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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38 else:
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39 sat_templates # to avoid pyflakes warning
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40
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41 try:
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42 import jinja2
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43 except:
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44 raise exceptions.MissingModule(u'Missing module jinja2, please install it from http://jinja.pocoo.org or with pip install jinja2')
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45
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46 HTML_EXT = ('html', 'xhtml')
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47 DEFAULT_LOCALE = u'en'
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48 # TODO: handle external path (an additional search path for templates should be settable by user
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49 # TODO: handle absolute URL (should be used for trusted use cases) only (e.g. jp) for security reason
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50
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51
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52 class TemplateLoader(jinja2.FileSystemLoader):
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53
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54 def __init__(self):
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55 searchpath = os.path.dirname(sat_templates.__file__)
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56 super(TemplateLoader, self).__init__(searchpath, followlinks=True)
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57
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58 def parse_template(self, template):
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59 """parse template path and return theme and relative URL
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60
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61 @param template_path(unicode): path to template with parenthesis syntax
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62 @return (tuple[(unicode,None),unicode]): theme and template_path
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63 theme can be None if relative path is used
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64 relative path is the path from search path with theme specified
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65 e.g. default/blog/articles.html
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66 """
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67 if template.startswith(u'('):
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68 try:
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69 theme_end = template.index(u')')
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70 except IndexError:
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71 raise ValueError(u"incorrect theme in template")
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72 theme = template[1:theme_end]
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73 template = template[theme_end+1:]
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74 if not template or template.startswith(u'/'):
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75 raise ValueError(u"incorrect path after template name")
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76 template = os.path.join(theme, template)
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77 elif template.startswith(u'/'):
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78 # absolute path means no template
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79 theme = None
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80 raise NotImplementedError(u'absolute path is not implemented yet')
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81 else:
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82 theme = C.TEMPLATE_THEME_DEFAULT
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83 template = os.path.join(theme, template)
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84 return theme, template
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85
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86 def get_default_template(self, theme, template_path):
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87 """return default template path
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88
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89 @param theme(unicode): theme used
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90 @param template_path(unicode): path to the not found template
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91 @return (unicode, None): default path or None if there is not
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92 """
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93 ext = os.path.splitext(template_path)[1][1:]
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94 path_elems = template_path.split(u'/')
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95 if ext in HTML_EXT:
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96 if path_elems[1] == u'error':
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97 # if an inexisting error page is requested, we return base page
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98 default_path = os.path.join(theme, u'error/base.html')
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99 return default_path
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100 if theme != C.TEMPLATE_THEME_DEFAULT:
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101 # if template doesn't exists for this theme, we try with default
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102 return os.path.join(C.TEMPLATE_THEME_DEFAULT, path_elems[1:])
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103
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104 def get_source(self, environment, template):
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105 """relative path to template dir, with special theme handling
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106
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107 if the path is just relative, "default" theme is used.
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108 The theme can be specified in parenthesis just before the path
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109 e.g.: (some_theme)path/to/template.html
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110 """
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111 theme, template_path = self.parse_template(template)
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112 try:
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113 return super(TemplateLoader, self).get_source(environment, template_path)
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114 except jinja2.exceptions.TemplateNotFound as e:
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115 # in some special cases, a defaut template is returned if nothing is found
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116 if theme is not None:
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117 default_path = self.get_default_template(theme, template_path)
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118 if default_path is not None:
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119 return super(TemplateLoader, self).get_source(environment, default_path)
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120 # if no default template is found, we re-raise the error
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121 raise e
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122
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123
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124 class Indexer(object):
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125 """Index global to a page"""
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126
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127 def __init__(self):
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128 self._idx = 0
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129
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130 def next(self):
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131 self._idx+=1
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132 return self._idx
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133
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134 def current(self):
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135 return self._idx
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136
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137
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138 class ScriptsHandler(object):
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139 # TODO: this class is not finished/used yet, and add_script is referenced in default/script/base.html
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140 # but doesn't exist yet here
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141
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142 def __init__(self, renderer, template_path, template_root_dir):
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143 self.renderer = renderer
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144 self.template_root_dir = template_root_dir
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145 self.scripts = OrderedDict
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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 import_script(self, library_name):
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149 if library_name.endswith('.js'):
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150 library_name = library_name[:-3]
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151 if library_name not in self.scripts:
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152 self.scripts[library_name] = {}
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153
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154 def generate(self):
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155 """Generate the <scripts> elements
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156 @return (unicode): <scripts> HTML tags
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157 """
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158 scripts = []
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159 tpl = u'<script src="{src}"></script>'
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160 for library,data in self.scripts:
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161 path = self.renderer.getStaticPath(library, self.template_root_dir, self.theme, self.is_default_theme, '.js')
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162 if path is None:
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163 log.warning(_(u"Can't find {}.js javascript library").format(library))
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164 continue
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165 scripts.append(tpl.format(src=quoteattr(path)))
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166 return u'\n'.join(scripts)
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167
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168
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169 class Renderer(object):
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170
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171 def __init__(self, host):
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172 self.host = host
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173 self.base_dir = os.path.dirname(sat_templates.__file__) # FIXME: should be modified if we handle use extra dirs
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174 self.env = jinja2.Environment(
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175 loader=TemplateLoader(),
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176 autoescape=jinja2.select_autoescape(['html', 'xhtml', 'xml']),
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177 trim_blocks=True,
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178 lstrip_blocks=True,
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179 extensions=['jinja2.ext.i18n'],
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180 )
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181 self._locale_str = DEFAULT_LOCALE
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182 self._locale = Locale.parse(self._locale_str)
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183 self.installTranslations()
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184 # we want to have access to SàT constants in templates
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185 self.env.globals[u'C'] = C
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186 # custom filters
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187 self.env.filters['next_gidx'] = self._next_gidx
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188 self.env.filters['cur_gidx'] = self._cur_gidx
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189 self.env.filters['blog_date'] = self._blog_date
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190
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191 def installTranslations(self):
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192 i18n_dir = os.path.join(self.base_dir, 'i18n')
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193 self.translations = {}
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194 for lang_dir in os.listdir(i18n_dir):
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195 lang_path = os.path.join(i18n_dir, lang_dir)
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196 if not os.path.isdir(lang_path):
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197 continue
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198 po_path = os.path.join(lang_path, 'LC_MESSAGES/sat.mo')
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199 try:
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200 with open(po_path, 'rb') as f:
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201 self.translations[Locale.parse(lang_dir)] = support.Translations(f, 'sat')
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202 except EnvironmentError:
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203 log.error(_(u"Can't find template translation at {path}").format(path = po_path))
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204 except UnknownLocaleError as e:
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205 log.error(_(u"Invalid locale name: {msg}").format(msg=e))
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206 else:
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207 log.info(_(u'loaded {lang} templates translations').format(lang=lang_dir))
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208 self.env.install_null_translations(True)
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209
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210 def setLocale(self, locale_str):
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211 if locale_str == self._locale_str:
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212 return
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213 locale = Locale.parse(locale_str)
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214 locale_str = unicode(locale)
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215 if locale_str != DEFAULT_LOCALE:
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diff changeset
216 try:
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217 translations = self.translations[locale]
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218 except KeyError:
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219 log.warning(_(u"Can't find locale {locale}".format(locale=locale)))
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220 locale_str = DEFAULT_LOCALE
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221 locale = Locale.parse(self._locale_str)
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222 else:
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223 self.env.install_gettext_translations(translations, True)
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diff changeset
224 log.debug(_(u'Switched to {lang}').format(lang=locale.english_name))
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diff changeset
225
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diff changeset
226 if locale_str == DEFAULT_LOCALE:
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227 self.env.install_null_translations(True)
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diff changeset
228
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229 self._locale = locale
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230 self._locale_str = locale_str
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diff changeset
231
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232 def getThemeAndRoot(self, template):
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233 """retrieve theme and root dir of a given tempalte
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234
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235 @param template(unicode): template to parse
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236 @return (tuple[unicode, unicode]): theme and absolute path to theme's root dir
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237 """
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238 theme, dummy = self.env.loader.parse_template(template)
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239 return theme, os.path.join(self.base_dir, theme)
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240
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diff changeset
241 def getStaticPath(self, name, template_root_dir, theme, is_default, ext='.css'):
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242 """retrieve path of a static file if it exists with current theme or default
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243
2245
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244 File will be looked at [theme]/static/[name][ext], and then default
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245 if not found.
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246 @param name(unicode): name of the file to look for
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247 @param template_root_dir(unicode): absolute path to template root used
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248 @param theme(unicode): name of the template theme used
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249 @param is_default(bool): True if theme is the default theme
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250 @return (unicode, None): relative path if found, else None
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251 """
2245
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252 file_ = None
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253 path = os.path.join(theme, C.TEMPLATE_STATIC_DIR, name + ext)
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diff changeset
254 if os.path.exists(os.path.join(template_root_dir, path)):
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255 file_ = path
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256 elif not is_default:
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diff changeset
257 path = os.path.join(C.TEMPLATE_THEME_DEFAULT, C.TEMPLATE_STATIC_DIR, name + ext)
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diff changeset
258 if os.path.exists(os.path.join(template_root_dir, path)):
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diff changeset
259 file_.append(path)
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diff changeset
260 return file_
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diff changeset
261
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diff changeset
262 def getThemeData(self, template_path):
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diff changeset
263 """return template data got from template_path
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diff changeset
264
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diff changeset
265 @return tuple(unicde, unicode, bool):
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diff changeset
266 path_elems: elements of the path
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diff changeset
267 theme: theme of the page
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diff changeset
268 is_default: True if the theme is the default theme
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diff changeset
269 """
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270 path_elems = template_path.split(u'/')
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271 theme = path_elems.pop(0)
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272 is_default = theme == C.TEMPLATE_THEME_DEFAULT
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273 return (path_elems, theme, is_default)
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274
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275 def getCSSFiles(self, template_path, template_root_dir):
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276 """retrieve CSS files to use according to theme and template path
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277
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278 for each element of the path, a .css file is looked for in /static, and returned if it exists.
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279 previous element are kept by replacing '/' with '_', and styles.css is always returned.
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280 For instance, if template_path is some_theme/blog/articles.html:
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281 some_theme/static/styles.css is returned if it exists else default/static/styles.css
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282 some_theme/static/blog.css is returned if it exists else default/static/blog.css (if it exists too)
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283 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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284 @param template_path(unicode): relative path to template file (e.g. some_theme/blog/articles.html)
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285 @param template_root_dir(unicode): absolute path of the theme root dir used
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286 @return list[unicode]: relative path to CSS files to use
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287 """
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288 # TODO: some caching would be nice
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289 css_files = []
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290 path_elems, theme, is_default = self.getThemeData(template_path)
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291 for css in (u'fonts', u'styles'):
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292 css_path = self.getStaticPath(css, template_root_dir, theme, is_default)
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293 if css_path is not None:
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294 css_files.append(css_path)
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295
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296 for idx, path in enumerate(path_elems):
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297 css_path = self.getStaticPath(u'_'.join(path_elems[:idx+1]), template_root_dir, theme, is_default)
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298 if css_path is not None:
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299 css_files.append(css_path)
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300
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301 return css_files
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302
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303 @jinja2.contextfilter
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304 def _next_gidx(self, ctx, value):
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305 """Use next current global index as suffix"""
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306 return u"{}_{}".format(value, ctx['gidx'].next())
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307
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308 @jinja2.contextfilter
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309 def _cur_gidx(self, ctx, value):
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310 """Use current current global index as suffix"""
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311 return u"{}_{}".format(value, ctx['gidx'].current())
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312
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313 def _blog_date(self, timestamp):
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314 # FIXME: Q&D, need to be done properly
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315 return unicode(int(time.time() - int(timestamp))/(3600*24)) + u" days ago"
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316
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317 def render(self, template, theme=None, locale=DEFAULT_LOCALE, root_path=u'', css_files=None, css_inline=False, **kwargs):
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318 """render a template
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319
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320 @param template(unicode): template to render (e.g. blog/articles.html)
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321 @param theme(unicode): template theme
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322 @param root_path(unicode): prefix of the path/URL to use for template root
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323 must end with a u'/'
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324 @param css_files(list[unicode],None): CSS files to used
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325 CSS files must be in static dir of the template
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326 use None for automatic selection of CSS files based on template category
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327 None is recommended. General static/style.css and theme file name will be used.
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328 @param css_inline(bool): if True, CSS will be embedded in the HTML page
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329 @param **kwargs: variable to transmit to the template
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330 """
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331 if not template:
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332 raise ValueError(u"template can't be empty")
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333 if theme is not None:
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334 # use want to set a theme, we add it to the template path
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335 if template[0] == u'(':
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336 raise ValueError(u"you can't specify theme in template path and in argument at the same time")
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337 elif template[0] == u'/':
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338 raise ValueError(u"you can't specify theme with absolute paths")
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339 template= u'(' + theme + u')' + template
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340 else:
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341 theme, dummy = self.env.loader.parse_template(template)
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342
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343 template_source = self.env.get_template(template)
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344 template_root_dir = os.path.normpath(self.base_dir) # FIXME: should be modified if we handle use extra dirs
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345 # XXX: template_path may have a different theme as first element than theme if a default page is used
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346 template_path = template_source.filename[len(template_root_dir)+1:]
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347
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348 if css_files is None:
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349 css_files = self.getCSSFiles(template_path, template_root_dir)
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350
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351 if css_inline:
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352 css_contents = []
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353 for css_file in css_files:
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354 css_file_path = os.path.join(template_root_dir, css_file)
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355 with open(css_file_path) as f:
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356 css_contents.append(f.read())
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357 if css_contents:
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358 kwargs['css_content'] = '\n'.join(css_contents)
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359
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360 scripts_handler = ScriptsHandler(self, template_path, template_root_dir)
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361 self.setLocale(locale)
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362 # XXX: theme used in template arguments is the requested theme, which may differ from actual theme
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363 # if the template doesn't exist in the requested theme.
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364 return template_source.render(theme=theme, root_path=root_path, css_files=css_files, locale=locale, gidx=Indexer(), scripts_handler=scripts_handler, **kwargs)