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annotate piecrust/templating/pystacheengine.py @ 196:154b8df04829

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processing: Add Compass and Sass processors. The Sass processor is similar to the Less processor, i.e. it tries to be part of the structured pipeline processing by using the mapfile produced by the Sass compiler in order to provide a list of dependencies. The Compass processor is completely acting outside of the pipeline, so the server won't know what's up to date and what's not. It's expected that the user will run `compass watch` to keep things up to date. However, it will require to pass the server's cache directory to put things in, so we'll need to add some easy way to get that path for the user.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 11 Jan 2015 23:08:49 -0800
parents 139179dc7abd
children f4b7c8f183a4
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139179dc7abd render: Add support for a Mustache template engine.
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1 import logging
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2 import pystache
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3 from piecrust.templating.base import (
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4 TemplateEngine, TemplateNotFoundError, TemplatingError)
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5
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6
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7 logger = logging.getLogger(__name__)
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8
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9
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10 class PystacheTemplateEngine(TemplateEngine):
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11 ENGINE_NAMES = ['mustache']
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12 EXTENSIONS = ['mustache']
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13
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14 def __init__(self):
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15 self.renderer = None
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16
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17 def renderString(self, txt, data, filename=None):
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18 self._ensureLoaded()
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19 try:
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20 return self.renderer.render(txt, data)
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21 except pystache.TemplateNotFoundError as ex:
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22 raise TemplateNotFoundError() from ex
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23 except pystache.PystacheError as ex:
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24 raise TemplatingError(str(ex), filename) from ex
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25
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26 def renderFile(self, paths, data):
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27 self._ensureLoaded()
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28 tpl = None
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29 logger.debug("Looking for template: %s" % paths)
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30 for p in paths:
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31 if not p.endswith('.mustache'):
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32 raise TemplatingError(
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33 "The Mustache template engine only accepts template "
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34 "filenames with a `.mustache` extension. Got: %s" %
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35 p)
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36 name = p[:-9] # strip `.mustache`
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37 try:
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38 tpl = self.renderer.load_template(name)
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39 except Exception as ex:
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40 print(p, ex)
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41 pass
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42
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43 if tpl is None:
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44 raise TemplateNotFoundError()
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45
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46 try:
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47 return self.renderer.render(tpl, data)
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48 except pystache.PystacheError as ex:
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49 raise TemplatingError(str(ex)) from ex
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50
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51 def _ensureLoaded(self):
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52 if self.renderer:
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53 return
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54
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55 self.renderer = pystache.Renderer(
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56 search_dirs=self.app.templates_dirs)
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57