Mercurial > piecrust2

annotate piecrust/processing/sass.py @ 499:a406b75c4bea

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sass: Overwrite the old map file with the new one always.
author Ludovic Chabant <ludovic@chabant.com>
date Thu, 23 Jul 2015 23:03:33 -0700
parents aa686b8fbfd0
children 81d9c3a3a0b5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
196
154b8df04829 processing: Add Compass and Sass processors.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
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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10
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11
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12 logger = logging.getLogger(__name__)
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13
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14
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15 class SassProcessor(SimpleFileProcessor):
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16 PROCESSOR_NAME = 'sass'
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17
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18 def __init__(self):
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19 super(SassProcessor, self).__init__(
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20 extensions={'scss': 'css', 'sass': 'css'})
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21 self._conf = None
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22 self._map_dir = None
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23
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24 def initialize(self, app):
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25 super(SassProcessor, self).initialize(app)
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26
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27 def onPipelineStart(self, pipeline):
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28 super(SassProcessor, self).onPipelineStart(pipeline)
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29
481
aa686b8fbfd0 bake: Fix random crash with the Sass processor.
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30 self._map_dir = os.path.join(pipeline.tmp_dir, 'sass')
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31 if pipeline.is_first_worker:
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32 if not os.path.isdir(self._map_dir):
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33 os.makedirs(self._map_dir)
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34
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35 # Ignore include-only Sass files.
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36 pipeline.addIgnorePatterns(['_*.scss', '_*.sass'])
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37
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38 def getDependencies(self, path):
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39 if _is_include_only(path):
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40 raise Exception("Include only Sass files should be ignored!")
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41
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42 map_path = self._getMapPath(path)
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43 try:
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44 with open(map_path, 'r') as f:
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45 dep_map = json.load(f)
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46 except IOError:
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47 # Map file not found... rebuild.
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48 logger.debug("No map file found for Sass file '%s' at '%s'. "
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49 "Rebuilding." % (path, map_path))
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50 return FORCE_BUILD
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51
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52 if dep_map.get('version') != 3:
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53 logger.warning("Unknown Sass map version. Rebuilding.")
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54 return FORCE_BUILD
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55
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56 sources = dep_map.get('sources', [])
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57 deps = list(map(_clean_scheme, sources))
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58 return deps
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59
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60 def _doProcess(self, in_path, out_path):
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61 self._ensureInitialized()
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62
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63 if _is_include_only(in_path):
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64 raise Exception("Include only Sass files should be ignored!")
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65
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66 sourcemap = 'none'
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67 if self.app.cache.enabled:
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68 sourcemap = 'file'
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69
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70 args = [self._conf['bin'],
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71 '--sourcemap=%s' % sourcemap,
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72 '--style', self._conf['style']]
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73
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74 cache_dir = self._conf['cache_dir']
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75 if cache_dir:
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76 args += ['--cache-location', cache_dir]
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77 else:
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78 args += ['--no-cache']
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79
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80 for lp in self._conf['load_paths']:
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81 args += ['-I', lp]
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82
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83 args += self._conf['options']
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84 args += [in_path, out_path]
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85 logger.debug("Processing Sass file: %s" % args)
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86
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87 # On Windows, we need to run the process in a shell environment
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88 # otherwise it looks like `PATH` isn't taken into account.
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89 shell = (platform.system() == 'Windows')
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90 try:
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91 retcode = subprocess.call(args, shell=shell)
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92 except FileNotFoundError as ex:
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93 logger.error("Tried running Sass processor with command: %s" %
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94 args)
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95 raise Exception("Error running Sass processor. "
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96 "Did you install it?") from ex
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97
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98 # The sourcemap is generated next to the CSS file... there doesn't
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99 # seem to be any option to override that, sadly... so we need to move
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100 # it to the cache directory.
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101 if self.app.cache.enabled:
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102 src_map_file = out_path + '.map'
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103 dst_map_file = self._getMapPath(in_path)
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104 if os.path.exists(dst_map_file):
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105 os.remove(dst_map_file)
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106 os.rename(src_map_file, dst_map_file)
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107
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108 if retcode != 0:
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109 raise Exception("Error occured in Sass compiler. Please check "
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110 "log messages above for more information.")
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111
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112 return True
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113
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114 def _ensureInitialized(self):
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115 if self._conf is not None:
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116 return
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117
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118 self._conf = self.app.config.get('sass') or {}
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119 self._conf.setdefault('bin', 'scss')
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120 self._conf.setdefault('style', 'nested')
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121 self._conf.setdefault('load_paths', [])
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122 if not isinstance(self._conf['load_paths'], list):
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123 raise Exception("The `sass/load_paths` configuration setting "
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124 "must be an array of paths.")
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125 self._conf.setdefault('options', [])
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126 if not isinstance(self._conf['options'], list):
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127 raise Exception("The `sass/options` configuration setting "
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128 "must be an array of arguments.")
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129
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130 cache_dir = None
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131 if self.app.cache.enabled:
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132 cache_dir = os.path.join(self.app.sub_cache_dir, 'sass')
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133 self._conf.setdefault('cache_dir', cache_dir)
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134
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135 def _getMapPath(self, path):
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136 map_name = "%s_%s.map" % (
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137 os.path.basename(path),
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138 hashlib.md5(path.encode('utf8')).hexdigest())
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139 map_path = os.path.join(self._map_dir, map_name)
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140 return map_path
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141
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142
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143 def _clean_scheme(p):
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144 if p.startswith('file://'):
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145 return p[7:]
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146 return p
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147
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148
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149 def _is_include_only(path):
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150 name = os.path.basename(path)
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151 return len(name) > 0 and name[0] == '_'
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152