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annotate piecrust/processing/less.py @ 120:133845647083

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Better error management and removal support in baking/processing. * Baker and processor pipeline now store errors in their records. * They also support deleting output files that are no longer valid. * The basic transitional record class implements more boilerplate code. * The processor pipeline is run from the `bake` command directly. * New unit tests. * Unit test mocking now mocks `os.remove` too.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 09 Nov 2014 14:46:23 -0800
parents 0811f92cbdc7
children b4724e577a8c
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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
3
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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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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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34 # Check the version, since the `sources` list has changed
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35 # meanings over time.
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36 if dep_map.get('version') != 3:
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37 logger.warning("Unknown LESS map version. Force rebuilding.")
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38 return FORCE_BUILD
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39
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40 # Get the sources, but make all paths absolute.
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41 sources = dep_map.get('sources')
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42 path_dir = os.path.dirname(path)
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43 def _makeAbs(p):
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44 return os.path.join(path_dir, p)
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45 deps = list(map(_makeAbs, sources))
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46 return [map_path] + deps
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47 except IOError:
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48 # Map file not found... rebuild.
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49 logger.debug("No map file found for LESS file '%s' at '%s'. "
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50 "Rebuilding" % (path, map_path))
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51 return FORCE_BUILD
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52
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53 def _doProcess(self, in_path, out_path):
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54 self._ensureInitialized()
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55
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56 map_path = self._getMapPath(in_path)
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57 map_path = os.path.relpath(map_path)
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58 args = [self._conf['bin'], '--source-map=%s' % map_path]
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59 args += self._conf['options']
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60 args.append(in_path)
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61 args.append(out_path)
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62 logger.debug("Processing LESS file: %s" % args)
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64 # On Windows, we need to run the process in a shell environment
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65 # otherwise it looks like `PATH` isn't taken into account.
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66 shell = (platform.system() == 'Windows')
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67 try:
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68 retcode = subprocess.call(args, shell=shell)
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69 except FileNotFoundError as ex:
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70 logger.error("Tried running LESS processor with command: %s" %
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71 args)
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72 raise Exception("Error running LESS processor. "
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73 "Did you install it?") from ex
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74 if retcode != 0:
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75 raise Exception("Error occured in LESS compiler. Please check "
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76 "log messages above for more information.")
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77 return True
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78
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79 def _ensureInitialized(self):
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80 if self._conf is not None:
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81 return
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82
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83 self._conf = self.app.config.get('less') or {}
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84 self._conf.setdefault('bin', 'lessc')
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85 self._conf.setdefault('options',
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86 ['--compress'])
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87 if not isinstance(self._conf['options'], list):
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88 raise Exception("The `less/options` configuration setting "
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89 "must be an array of arguments.")
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90
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91 def _getMapPath(self, path):
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92 map_name = "%s_%s.map" % (
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93 os.path.basename(path),
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94 hashlib.md5(path.encode('utf8')).hexdigest())
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95 map_path = os.path.join(self._map_dir, map_name)
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96 return map_path
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97