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annotate piecrust/processing/less.py @ 111:208c652551a3

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Quick fix for making the server correctly update referenced pages. Disable the file-system cache for rendered segments when in server mode. We can bring this optimization back when we're actually using the baking record in the server too in order to know dependencies.
author Ludovic Chabant <ludovic@chabant.com>
date Thu, 16 Oct 2014 17:03:42 -0700
parents de6a296744f7
children 1c13f3389fcb
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1 import os
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2 import os.path
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3 import json
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4 import hashlib
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5 import logging
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6 import platform
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7 import subprocess
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8 from piecrust.processing.base import SimpleFileProcessor
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9 from piecrust.processing.tree import FORCE_BUILD
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12 logger = logging.getLogger(__name__)
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14
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15 class LessProcessor(SimpleFileProcessor):
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16 PROCESSOR_NAME = 'less'
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17
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18 def __init__(self):
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19 super(LessProcessor, self).__init__({'less': 'css'})
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20 self._conf = None
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21 self._map_dir = None
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22
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23 def onPipelineStart(self, pipeline):
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24 self._map_dir = os.path.join(pipeline.tmp_dir, 'less')
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25 if not os.path.isdir(self._map_dir):
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26 os.makedirs(self._map_dir)
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27
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28 def getDependencies(self, path):
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29 map_path = self._getMapPath(path)
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30 try:
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31 with open(map_path, 'r') as f:
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32 dep_map = json.load(f)
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33 source = dep_map.get('sources')
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34 # The last one is always the file itself, so skip that. Also,
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35 # make all paths absolute.
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36 path_dir = os.path.dirname(path)
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37 def _makeAbs(p):
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38 return os.path.join(path_dir, p)
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39 return list(map(_makeAbs, source[:-1]))
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40 except IOError:
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41 # Map file not found... rebuild.
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42 logger.debug("No map file found for LESS file '%s' at '%s'. "
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43 "Rebuilding" % (path, map_path))
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44 return FORCE_BUILD
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45
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46 def _doProcess(self, in_path, out_path):
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47 self._ensureInitialized()
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48
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49 map_path = self._getMapPath(in_path)
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50 map_path = os.path.relpath(map_path)
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51 args = [self._conf['bin'], '--source-map=%s' % map_path]
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52 args += self._conf['options']
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53 args.append(in_path)
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54 args.append(out_path)
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55 logger.debug("Processing LESS file: %s" % args)
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56
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57 # On Windows, we need to run the process in a shell environment
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58 # otherwise it looks like `PATH` isn't taken into account.
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59 shell=(platform.system() == 'Windows')
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60 try:
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61 retcode = subprocess.call(args, shell=shell)
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62 except FileNotFoundError as ex:
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63 logger.error("Tried running LESS processor with command: %s" %
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64 args)
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65 raise Exception("Error running LESS processor. "
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66 "Did you install it?") from ex
3
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67 if retcode != 0:
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68 raise Exception("Error occured in LESS compiler. Please check "
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69 "log messages above for more information.")
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70 return True
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71
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72 def _ensureInitialized(self):
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73 if self._conf is not None:
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74 return
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75
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76 self._conf = self.app.config.get('less') or {}
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77 self._conf.setdefault('bin', 'lessc')
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78 self._conf.setdefault('options',
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79 ['--compress'])
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80 if not isinstance(self._conf['options'], list):
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81 raise Exception("The `less/options` configuration setting "
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82 "must be an array of arguments.")
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83
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84 def _getMapPath(self, path):
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85 map_name = "%s.map" % hashlib.md5(path.encode('utf8')).hexdigest()
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86 map_path = os.path.join(self._map_dir, map_name)
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87 return map_path
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88