terom@150: """
terom@150:     Template handler
terom@150: """
terom@150: 
terom@150: # use Mako
terom@150: from mako import exceptions
terom@150: from mako.template import Template
terom@150: from mako.lookup import TemplateLookup
terom@150: 
terom@150: # for http.ResponseError
terom@150: import http
terom@150: 
terom@150: # path to template files
terom@150: TEMPLATE_DIR = "templates"
terom@150: 
terom@150: # path to cached templates
terom@150: CACHE_DIR = "cache/templates"
terom@150: 
terom@150: # template file extension
terom@150: TEMPLATE_EXT = "tmpl"
terom@150: 
terom@150: 
terom@150: # our Mako template lookup handler
terom@150: _lookup = TemplateLookup(directories=[TEMPLATE_DIR], module_directory=CACHE_DIR)
terom@150: 
terom@150: 
terom@150: class TemplateError (http.ResponseError) :
terom@150:     """
terom@150:         Raised by the template module functions
terom@150:     """
terom@150: 
terom@150:     pass
terom@150: 
terom@150: def lookup (name) :
terom@150:     """
terom@150:         Looks up a template based on the bare "name", which does not include the path or file extension
terom@150:     """
terom@150:     
terom@150:     try :
terom@150:         return _lookup.get_template("%s.%s" % (name, TEMPLATE_EXT))
terom@150: 
terom@150:     except :
terom@150:         raise TemplateError("Template broken: %r" % (name, ), status='500 Internal Server Error', details=exceptions.text_error_template().render())
terom@150: 
terom@150: def load (path) :
terom@150:     """
terom@150:         Loads a template from a specific file
terom@150:     """
terom@150: 
terom@150:     try :
terom@150:         return Template(filename=path, module_directory=CACHE_DIR)
terom@150: 
terom@150:     except :
terom@150:         raise TemplateError("Template broken: %r" % (path, ), status='500 Internal Server Error', details=exceptions.text_error_template().render())
terom@150: 
terom@150: def render_template (tpl, **params) :
terom@150:     """
terom@150:         Render the given template, returning the output, or raising a TemplateError
terom@150:     """
terom@150: 
terom@150:     try :
terom@150:         return tpl.render(**params)
terom@153:     
terom@153:     # a template may render other templates
terom@153:     except TemplateError :
terom@153:         raise
terom@150: 
terom@150:     except :
terom@153:         details = exceptions.text_error_template().render()
terom@153: 
terom@153:         raise TemplateError("Template render failed", status='500 Internal Server Error', details=details)
terom@150: 
terom@150: def render (name, **params) :
terom@150:     """
terom@150:         Render a template, using lookup() on the given name
terom@150:     """
terom@150: 
terom@150:     return render_template(lookup(name), **params)
terom@150: 
terom@150: def render_file (path, **params) :
terom@150:     """
terom@150:         Render a template, using load() on the given path
terom@150:     """
terom@150: 
terom@150:     return render_template(load(path), **params)
terom@150: