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annotate piecrust/processing/less.py @ 880:342e3ea24b5d

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serve: Fix asset processing loop.
author Ludovic Chabant <ludovic@chabant.com>
date Thu, 15 Jun 2017 22:55:32 -0700
parents 4850f8c21b6e
children 63be34ce6e65
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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, FORCE_BUILD)
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13 logger = logging.getLogger(__name__)
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15
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16 class LessProcessor(SimpleFileProcessor):
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17 PROCESSOR_NAME = 'less'
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18
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19 def __init__(self):
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20 super(LessProcessor, self).__init__({'less': '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 onPipelineStart(self, ctx):
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25 self._map_dir = os.path.join(ctx.tmp_dir, 'less')
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26 if (ctx.is_main_process and
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27 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 except OSError:
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36 # Map file not found... rebuild.
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37 logger.debug("No map file found for LESS file '%s' at '%s'. "
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38 "Rebuilding" % (path, map_path))
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39 return FORCE_BUILD
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40
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41 # Check the version, since the `sources` list has changed
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42 # meanings over time.
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43 if dep_map.get('version') != 3:
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44 logger.warning("Unknown LESS map version. Force rebuilding.")
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45 return FORCE_BUILD
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46
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47 # Get the sources, but make all paths absolute.
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48 sources = dep_map.get('sources')
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49 path_dir = os.path.dirname(path)
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51 def _makeAbs(p):
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52 return os.path.join(path_dir, p)
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53 deps = list(map(_makeAbs, sources))
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54 return [map_path] + deps
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55
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56 def _doProcess(self, in_path, out_path):
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57 self._ensureInitialized()
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58
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59 map_path = self._getMapPath(in_path)
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60 map_url = '/' + os.path.relpath(
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61 map_path, self.app.root_dir).replace('\\', '/')
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63 # On Windows, it looks like LESSC is confused with paths when the
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64 # map file is not to be created in the same directory as the input
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65 # file (it ends up writing invalid dependencies in the map file, with
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66 # a mix of relative and absolute paths stuck together).
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67 # So create it there and move it afterwards... :(
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68 temp_map_path = os.path.join(
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69 os.path.dirname(in_path),
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70 os.path.basename(map_path))
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71
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72 args = [self._conf['bin'],
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73 '--source-map=%s' % temp_map_path,
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74 '--source-map-url=%s' % map_url]
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75 args += self._conf['options']
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76 args.append(in_path)
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77 args.append(out_path)
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78 logger.debug("Processing LESS file: %s" % args)
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79
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80 # On Windows, we need to run the process in a shell environment
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81 # otherwise it looks like `PATH` isn't taken into account.
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82 shell = (platform.system() == 'Windows')
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83 try:
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84 proc = subprocess.Popen(
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85 args, shell=shell,
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86 stderr=subprocess.PIPE)
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87 stdout_data, stderr_data = proc.communicate()
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88 except FileNotFoundError as ex:
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89 logger.error("Tried running LESS processor with command: %s" %
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90 args)
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91 raise Exception("Error running LESS processor. "
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92 "Did you install it?") from ex
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93 if proc.returncode != 0:
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94 raise ExternalProcessException(
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95 stderr_data.decode(sys.stderr.encoding))
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96
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97 logger.debug("Moving map file: %s -> %s" % (temp_map_path, map_path))
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98 if os.path.exists(map_path):
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99 os.remove(map_path)
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100 os.rename(temp_map_path, map_path)
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101
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102 return True
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103
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104 def _ensureInitialized(self):
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105 if self._conf is not None:
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106 return
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107
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108 self._conf = self.app.config.get('less') or {}
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109 self._conf.setdefault('bin', 'lessc')
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110 self._conf.setdefault('options', ['--compress'])
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111 if not isinstance(self._conf['options'], list):
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112 raise Exception("The `less/options` configuration setting "
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113 "must be an array of arguments.")
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114
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115 def _getMapPath(self, path):
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116 map_name = "%s_%s.map" % (
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117 os.path.basename(path),
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118 hashlib.md5(path.encode('utf8')).hexdigest())
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119 map_path = os.path.join(self._map_dir, map_name)
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120 return map_path
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121