app/sass.py

   1 # -*- coding: utf-8 -*-
   2 """
   3 A small Flask extension that makes it easy to use Sass (SCSS) with your
   4 Flask application.
   5
   6 Code unabashedly adapted from https://github.com/weapp/flask-coffee2js
   7
   8 :copyright: (c) 2012 by Ivan Miric.
   9 :license: MIT, see LICENSE for more details.
  10 """
  11
  12 import os
  13 import os.path
  14 import codecs
  15 from flask import *
  16 from scss import Scss
  17
  18 def _convert(dir, src, dst):
  19         original_wd = os.getcwd()
  20         os.chdir(dir)
  21
  22         css = Scss()
  23         source = codecs.open(src, 'r', encoding='utf-8').read()
  24         output = css.compile(source)
  25
  26         os.chdir(original_wd)
  27
  28         outfile = codecs.open(dst, 'w', encoding='utf-8')
  29         outfile.write(output)
  30         outfile.close()
  31
  32 def _getDirPath(app, originalPath, create=False):
  33         path = originalPath
  34
  35         if not os.path.isdir(path):
  36                 path = os.path.join(app.root_path, path)
  37
  38         if not os.path.isdir(path):
  39                 if create:
  40                         os.mkdir(path)
  41                 else:
  42                         raise IOError("Unable to find " + originalPath)
  43
  44         return path
  45
  46 def sass(app, inputDir='scss', outputPath='static', force=False, cacheDir="public/static"):
  47         static_url_path = app.static_url_path
  48         inputDir = _getDirPath(app, inputDir)
  49         cacheDir = _getDirPath(app, cacheDir or outputPath, True)
  50
  51         def _sass(filepath):
  52                 sassfile = "%s/%s.scss" % (inputDir, filepath)
  53                 cacheFile = "%s/%s.css" % (cacheDir, filepath)
  54
  55                 # Source file exists, and needs regenerating
  56                 if os.path.isfile(sassfile) and (force or not os.path.isfile(cacheFile) or \
  57                                 os.path.getmtime(sassfile) > os.path.getmtime(cacheFile)):
  58                         _convert(inputDir, sassfile, cacheFile)
  59                         app.logger.debug('Compiled %s into %s' % (sassfile, cacheFile))
  60
  61                 return send_from_directory(cacheDir, filepath + ".css")
  62
  63         app.add_url_rule("/%s/<path:filepath>.css" % (outputPath), 'sass', _sass)