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comparison piecrust/processing/less.py @ 3:f485ba500df3

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Gigantic change to basically make PieCrust 2 vaguely functional. - Serving works, with debug window. - Baking works, multi-threading, with dependency handling. - Various things not implemented yet.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 10 Aug 2014 23:43:16 -0700
parents
children 474c9882decf
comparison
equal deleted inserted replaced
2:40fa08b261b9 3:f485ba500df3
1 import os
2 import os.path
3 import json
4 import hashlib
5 import logging
6 import subprocess
7 from piecrust.processing.base import SimpleFileProcessor
8 from piecrust.processing.tree import FORCE_BUILD
9
10
11 logger = logging.getLogger(__name__)
12
13
14 class LessProcessor(SimpleFileProcessor):
15 PROCESSOR_NAME = 'less'
16
17 def __init__(self):
18 super(LessProcessor, self).__init__({'less': 'css'})
19 self._conf = None
20 self._map_dir = None
21
22 def onPipelineStart(self, pipeline):
23 self._map_dir = os.path.join(pipeline.tmp_dir, 'less')
24 if not os.path.isdir(self._map_dir):
25 os.makedirs(self._map_dir)
26
27 def getDependencies(self, path):
28 map_path = self._getMapPath(path)
29 try:
30 with open(map_path, 'r') as f:
31 dep_map = json.load(f)
32 source = dep_map.get('sources')
33 # The last one is always the file itself, so skip that. Also,
34 # make all paths absolute.
35 path_dir = os.path.dirname(path)
36 def _makeAbs(p):
37 return os.path.join(path_dir, p)
38 return map(_makeAbs, source[:-1])
39 except IOError:
40 # Map file not found... rebuild.
41 logger.debug("No map file found for LESS file '%s' at '%s'. "
42 "Rebuilding" % (path, map_path))
43 return FORCE_BUILD
44
45 def _doProcess(self, in_path, out_path):
46 self._ensureInitialized()
47
48 map_path = self._getMapPath(in_path)
49 map_path = os.path.relpath(map_path)
50 args = [self._conf['bin'], '--source-map=%s' % map_path]
51 args += self._conf['options']
52 args.append(in_path)
53 args.append(out_path)
54 logger.debug("Processing LESS file: %s" % args)
55 retcode = subprocess.call(args)
56 if retcode != 0:
57 raise Exception("Error occured in LESS compiler. Please check "
58 "log messages above for more information.")
59 return True
60
61 def _ensureInitialized(self):
62 if self._conf is not None:
63 return
64
65 self._conf = self.app.config.get('less') or {}
66 self._conf.setdefault('bin', 'lessc')
67 self._conf.setdefault('options',
68 ['--compress'])
69 if not isinstance(self._conf['options'], list):
70 raise Exception("The `less/options` configuration setting "
71 "must be an array of arguments.")
72
73 def _getMapPath(self, path):
74 map_name = "%s.map" % hashlib.md5(path).hexdigest()
75 map_path = os.path.join(self._map_dir, map_name)
76 return map_path
77