Mercurial > piecrust2

annotate piecrust/processing/sass.py @ 895:accfe8fc8440

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admin: Add a Micropub endpoint.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 02 Jul 2017 22:23:12 -0700
parents 4850f8c21b6e
children e00ff3dcb5ec
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
196
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Ludovic Chabant <ludovic@chabant.com>
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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, FORCE_BUILD
196
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9
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10
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11 logger = logging.getLogger(__name__)
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12
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13
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14 class SassProcessor(SimpleFileProcessor):
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15 PROCESSOR_NAME = 'sass'
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16
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17 def __init__(self):
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18 super(SassProcessor, self).__init__(
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19 extensions={'scss': 'css', 'sass': '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 initialize(self, app):
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24 super(SassProcessor, self).initialize(app)
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25
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26 def onPipelineStart(self, ctx):
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27 super(SassProcessor, self).onPipelineStart(ctx)
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28
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29 self._map_dir = os.path.join(ctx.tmp_dir, 'sass')
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30 if ctx.is_main_process:
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31 if not os.path.isdir(self._map_dir):
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32 os.makedirs(self._map_dir)
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33
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34 # Ignore include-only Sass files.
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35 ctx.ignore_patterns += ['_*.scss', '_*.sass']
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36
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37 def getDependencies(self, path):
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38 if _is_include_only(path):
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39 raise Exception("Include only Sass files should be ignored!")
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40
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41 map_path = self._getMapPath(path)
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42 try:
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43 with open(map_path, 'r') as f:
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44 dep_map = json.load(f)
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45 except IOError:
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46 # Map file not found... rebuild.
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47 logger.debug("No map file found for Sass file '%s' at '%s'. "
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48 "Rebuilding." % (path, map_path))
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49 return FORCE_BUILD
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50
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51 if dep_map.get('version') != 3:
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52 logger.warning("Unknown Sass map version. Rebuilding.")
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53 return FORCE_BUILD
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54
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55 sources = dep_map.get('sources', [])
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56 deps = list(map(_clean_scheme, sources))
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57 return deps
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58
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59 def _doProcess(self, in_path, out_path):
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60 self._ensureInitialized()
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61
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62 if _is_include_only(in_path):
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63 raise Exception("Include only Sass files should be ignored!")
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64
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65 sourcemap = 'none'
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66 if self.app.cache.enabled:
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67 sourcemap = 'file'
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68
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69 args = [self._conf['bin'],
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70 '--sourcemap=%s' % sourcemap,
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71 '--style', self._conf['style']]
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72
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73 cache_dir = self._conf['cache_dir']
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74 if cache_dir:
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75 args += ['--cache-location', cache_dir]
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76 else:
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77 args += ['--no-cache']
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78
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79 for lp in self._conf['load_paths']:
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80 args += ['-I', lp]
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81
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82 args += self._conf['options']
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83 args += [in_path, out_path]
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84 logger.debug("Processing Sass file: %s" % args)
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85
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86 # On Windows, we need to run the process in a shell environment
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87 # otherwise it looks like `PATH` isn't taken into account.
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88 shell = (platform.system() == 'Windows')
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89 try:
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90 retcode = subprocess.call(args, shell=shell)
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91 except FileNotFoundError as ex:
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92 logger.error("Tried running Sass processor with command: %s" %
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93 args)
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94 raise Exception("Error running Sass processor. "
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95 "Did you install it?") from ex
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96
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97 # The sourcemap is generated next to the CSS file... there doesn't
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98 # seem to be any option to override that, sadly... so we need to move
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99 # it to the cache directory.
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100 if self.app.cache.enabled:
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101 src_map_file = out_path + '.map'
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102 dst_map_file = self._getMapPath(in_path)
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103 if os.path.exists(dst_map_file):
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104 os.remove(dst_map_file)
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105 os.rename(src_map_file, dst_map_file)
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106
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107 if retcode != 0:
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108 raise Exception("Error occured in Sass compiler. Please check "
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109 "log messages above for more information.")
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110
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111 return True
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112
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113 def _ensureInitialized(self):
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114 if self._conf is not None:
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115 return
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116
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117 self._conf = self.app.config.get('sass') or {}
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118 self._conf.setdefault('bin', 'scss')
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119 self._conf.setdefault('style', 'nested')
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120 self._conf.setdefault('load_paths', [])
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121 if not isinstance(self._conf['load_paths'], list):
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122 raise Exception("The `sass/load_paths` configuration setting "
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123 "must be an array of paths.")
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124 self._conf.setdefault('options', [])
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125 if not isinstance(self._conf['options'], list):
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126 raise Exception("The `sass/options` configuration setting "
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127 "must be an array of arguments.")
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128
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129 cache_dir = None
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130 if self.app.cache.enabled:
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131 cache_dir = os.path.join(self.app.cache_dir, 'sass')
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132 self._conf.setdefault('cache_dir', cache_dir)
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133
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134 def _getMapPath(self, path):
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135 map_name = "%s_%s.map" % (
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136 os.path.basename(path),
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137 hashlib.md5(path.encode('utf8')).hexdigest())
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138 map_path = os.path.join(self._map_dir, map_name)
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139 return map_path
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140
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141
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142 def _clean_scheme(p):
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143 if p.startswith('file://'):
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144 return p[7:]
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145 return p
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146
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147
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148 def _is_include_only(path):
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149 name = os.path.basename(path)
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150 return len(name) > 0 and name[0] == '_'
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151