app/views/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 from app import app
  19
  20 def _convert(dir, src, dst):
  21         original_wd = os.getcwd()
  22         os.chdir(dir)
  23
  24         css = Scss()
  25         source = codecs.open(src, 'r', encoding='utf-8').read()
  26         output = css.compile(source)
  27
  28         os.chdir(original_wd)
  29
  30         outfile = codecs.open(dst, 'w', encoding='utf-8')
  31         outfile.write(output)
  32         outfile.close()
  33
  34 def _getDirPath(originalPath, create=False):
  35         path = originalPath
  36
  37         if not os.path.isdir(path):
  38                 path = os.path.join(app.root_path, path)
  39
  40         if not os.path.isdir(path):
  41                 if create:
  42                         os.mkdir(path)
  43                 else:
  44                         raise IOError("Unable to find " + originalPath)
  45
  46         return path
  47
  48 def sass(app, inputDir='scss', outputPath='static', force=False, cacheDir="public/static"):
  49         static_url_path = app.static_url_path
  50         inputDir = _getDirPath(inputDir)
  51         cacheDir = _getDirPath(cacheDir or outputPath, True)
  52
  53         def _sass(filepath):
  54                 sassfile = "%s/%s.scss" % (inputDir, filepath)
  55                 cacheFile = "%s/%s.css" % (cacheDir, filepath)
  56
  57                 # Source file exists, and needs regenerating
  58                 if os.path.isfile(sassfile) and (force or not os.path.isfile(cacheFile) or \
  59                                 os.path.getmtime(sassfile) > os.path.getmtime(cacheFile)):
  60                         _convert(inputDir, sassfile, cacheFile)
  61                         app.logger.debug('Compiled %s into %s' % (sassfile, cacheFile))
  62
  63                 return send_from_directory(cacheDir, filepath + ".css")
  64
  65         app.add_url_rule("/%s/<path:filepath>.css" % (outputPath), 'sass', _sass)
  66
  67 sass(app)