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annotate piecrust/templating/pystacheengine.py @ 371:c2ca72fb7f0b 2.0.0a8

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caching: Use separate caches for config variants and other contexts. * The `_cache` directory is now organized in multiple "sub-caches" for different contexts. * A new context is created when config variants or overrides are applied. * `serve` context uses a different context that the other commends, to prevent the `bake` command's output from messing up the preview server (e.g. with how asset URLs are generated differently between the two). * Fix a few places where the cache directory was referenced directly.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 03 May 2015 23:59:46 -0700
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