JS template filter for webassets

jqtfilter.py

"""
Webasset filter to combine JQuery Templates files into javascript-safe strings,
and put them into a namespace
"""
import os
from webassets.filter import Filter

class JqtFilter(Filter):
    name = 'jqt'

    def setup(self):
        self.compiled = []
        self.before = "(function(){"
        self.after = "})();"
        self.namespace = "JQT"
        self.extension = ".jqt"

    def input(self, _in, out, source_path, output_path):
        # just pass the strings
        fmt = "%(namespace)s['%(name)s']='%(template)s';"

        item = {
            'namespace': self.namespace,
            'template': _in.read().replace('\n', '').replace("'", r"\'"),
            'name': os.path.basename(source_path).replace(self.extension, "")
        }
        self.compiled.append(fmt % item)

    def output(self, _in, out, **kw):
        # setup namespace
        namespace = "%s=%s||{};" % (self.namespace, self.namespace)
        output = self.before + namespace + "".join(self.compiled) + self.after
        out.write(output)