1

"""

     2

    Template handler

     3

"""

     4

     5

# use Mako

     6

from mako import exceptions

     7

from mako.template import Template

     8

from mako.lookup import TemplateLookup

     9

    10

# for http.ResponseError

    11

import http

    12

    13

# path to template files

    14

TEMPLATE_DIR = "templates"

    15

    16

# path to cached templates

    17

CACHE_DIR = "cache/templates"

    18

    19

# template file extension

    20

TEMPLATE_EXT = "tmpl"

    21

    22

    23

# our Mako template lookup handler

    24

_lookup = TemplateLookup(directories=[TEMPLATE_DIR], module_directory=CACHE_DIR)

    25

    26

    27

class TemplateError (http.ResponseError) :

    28

    """

    29

        Raised by the template module functions

    30

    """

    31

    32

    pass

    33

    34

def lookup (name) :

    35

    """

    36

        Looks up a template based on the bare "name", which does not include the path or file extension

    37

    """

    38

    39

    try :

    40

        return _lookup.get_template("%s.%s" % (name, TEMPLATE_EXT))

    41

    42

    except :

    43

        raise TemplateError("Template broken: %r" % (name, ), status='500 Internal Server Error', details=exceptions.text_error_template().render())

    44

    45

def load (path) :

    46

    """

    47

        Loads a template from a specific file

    48

    """

    49

    50

    try :

    51

        return Template(filename=path, module_directory=CACHE_DIR)

    52

    53

    except :

    54

        raise TemplateError("Template broken: %r" % (path, ), status='500 Internal Server Error', details=exceptions.text_error_template().render())

    55

    56

def render_template (tpl, **params) :

    57

    """

    58

        Render the given template, returning the output, or raising a TemplateError

    59

    """

    60

    61

    try :

    62

        return tpl.render(**params)

    63

    64

    except :

    65

        raise TemplateError("Template render failed", status='500 Internal Server Error', details=exceptions.text_error_template().render())

    66

    67

def render (name, **params) :

    68

    """

    69

        Render a template, using lookup() on the given name

    70

    """

    71

    72

    return render_template(lookup(name), **params)

    73

    74

def render_file (path, **params) :

    75

    """

    76

        Render a template, using load() on the given path

    77

    """

    78

    79

    return render_template(load(path), **params)

    80