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annotate piecrust/data/assetor.py @ 6:f5ca5c5bed85

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More Python 3 fixes, modularization, and new unit tests.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 16 Aug 2014 08:15:30 -0700
parents 474c9882decf
children a8f9c78a6608
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6
f5ca5c5bed85 More Python 3 fixes, modularization, and new unit tests.
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1 import os
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2 import os.path
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3 import logging
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4 from piecrust.uriutil import multi_replace
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7 logger = logging.getLogger(__name__)
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10 class UnsupportedAssetsError(Exception):
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11 pass
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14 def build_base_url(app, uri, assets_path):
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15 base_url_format = app.env.base_asset_url_format
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16 site_root = app.config.get('site/root')
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17 rel_path = os.path.relpath(assets_path, app.root_dir)
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18 pretty = app.config.get('site/pretty_urls')
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19 if not pretty:
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20 uri, _ = os.path.splitext(uri)
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21 uri = uri.lstrip('/')
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22 base_url = multi_replace(
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23 base_url_format,
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24 {
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25 '%site_root%': site_root,
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26 '%path%': rel_path,
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27 '%uri%': uri})
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28 return base_url.rstrip('/') + '/'
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30
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31 class Assetor(object):
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32 ASSET_DIR_SUFFIX = '-assets'
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33
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34 debug_render_doc = """Helps render URLs to files in the current page's
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35 asset folder."""
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36 debug_render = []
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37 debug_render_dynamic = ['_debugRenderAssetNames']
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38
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39 def __init__(self, page, uri):
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40 self._page = page
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41 self._uri = uri
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42 self._cache = None
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43
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44 def __getattr__(self, name):
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45 try:
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46 self._cacheAssets()
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47 return self._cache[name]
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48 except KeyError:
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49 raise AttributeError()
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50
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51 def __getitem__(self, key):
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52 self._cacheAssets()
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53 return self._cache[key]
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54
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55 def __iter__(self):
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56 self._cacheAssets()
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57 return self._cache.__iter__()
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58
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59 def iterkeys(self):
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60 return self.__iter__(self)
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61
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62 def _debugRenderAssetNames(self):
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63 self._cacheAssets()
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64 return list(self._cache.keys())
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65
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66 def _cacheAssets(self):
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67 if self._cache is not None:
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68 return
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70 self._cache = {}
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71 name, ext = os.path.splitext(self._page.path)
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72 assets_dir = name + Assetor.ASSET_DIR_SUFFIX
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73 if not os.path.isdir(assets_dir):
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74 return
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75
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76 base_url = build_base_url(self._page.app, self._uri, assets_dir)
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77 for _, __, filenames in os.walk(assets_dir):
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78 for fn in filenames:
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79 name, ext = os.path.splitext(fn)
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80 if name in self._cache:
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81 raise UnsupportedAssetsError(
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82 "Multiple asset files are named '%s'." % name)
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83 self._cache[name] = base_url + fn
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84