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annotate piecrust/processing/less.py @ 232:e534d2bc657c

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cosmetic: Fix PEP8 spacing.
author Ludovic Chabant <ludovic@chabant.com>
date Wed, 11 Feb 2015 08:31:36 -0800
parents f82262f59600
children c1d4e86a3918
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 import os
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2 import os.path
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3 import sys
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4 import json
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5 import hashlib
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6 import logging
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7 import platform
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8 import subprocess
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9 from piecrust.processing.base import (
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10 SimpleFileProcessor, ExternalProcessException)
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11 from piecrust.processing.tree import FORCE_BUILD
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14 logger = logging.getLogger(__name__)
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16
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17 class LessProcessor(SimpleFileProcessor):
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18 PROCESSOR_NAME = 'less'
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19
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20 def __init__(self):
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21 super(LessProcessor, self).__init__({'less': 'css'})
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22 self._conf = None
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23 self._map_dir = None
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24
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25 def onPipelineStart(self, pipeline):
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26 self._map_dir = os.path.join(pipeline.tmp_dir, 'less')
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27 if not os.path.isdir(self._map_dir):
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28 os.makedirs(self._map_dir)
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29
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30 def getDependencies(self, path):
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31 map_path = self._getMapPath(path)
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32 try:
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33 with open(map_path, 'r') as f:
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34 dep_map = json.load(f)
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35
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36 # Check the version, since the `sources` list has changed
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37 # meanings over time.
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38 if dep_map.get('version') != 3:
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39 logger.warning("Unknown LESS map version. Force rebuilding.")
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40 return FORCE_BUILD
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41
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42 # Get the sources, but make all paths absolute.
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43 sources = dep_map.get('sources')
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44 path_dir = os.path.dirname(path)
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45 def _makeAbs(p):
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46 return os.path.join(path_dir, p)
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47 deps = list(map(_makeAbs, sources))
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48 return [map_path] + deps
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49 except IOError:
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50 # Map file not found... rebuild.
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51 logger.debug("No map file found for LESS file '%s' at '%s'. "
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52 "Rebuilding" % (path, map_path))
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53 return FORCE_BUILD
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54
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55 def _doProcess(self, in_path, out_path):
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56 self._ensureInitialized()
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57
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58 map_path = self._getMapPath(in_path)
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59 map_path = os.path.relpath(map_path)
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60 args = [self._conf['bin'], '--source-map=%s' % map_path]
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61 args += self._conf['options']
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62 args.append(in_path)
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63 args.append(out_path)
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64 logger.debug("Processing LESS file: %s" % args)
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65
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66 # On Windows, we need to run the process in a shell environment
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67 # otherwise it looks like `PATH` isn't taken into account.
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68 shell = (platform.system() == 'Windows')
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69 try:
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70 proc = subprocess.Popen(
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71 args, shell=shell,
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72 stderr=subprocess.PIPE)
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73 stdout_data, stderr_data = proc.communicate()
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74 except FileNotFoundError as ex:
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75 logger.error("Tried running LESS processor with command: %s" %
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76 args)
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77 raise Exception("Error running LESS processor. "
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78 "Did you install it?") from ex
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79 if proc.returncode != 0:
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80 raise ExternalProcessException(
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81 stderr_data.decode(sys.stderr.encoding))
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82
3
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83 return True
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84
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85 def _ensureInitialized(self):
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86 if self._conf is not None:
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87 return
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89 self._conf = self.app.config.get('less') or {}
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90 self._conf.setdefault('bin', 'lessc')
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91 self._conf.setdefault('options', ['--compress'])
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92 if not isinstance(self._conf['options'], list):
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93 raise Exception("The `less/options` configuration setting "
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94 "must be an array of arguments.")
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95
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96 def _getMapPath(self, path):
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97 map_name = "%s_%s.map" % (
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98 os.path.basename(path),
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99 hashlib.md5(path.encode('utf8')).hexdigest())
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100 map_path = os.path.join(self._map_dir, map_name)
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101 return map_path
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102