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""" fabfile to prepare the notebook """
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from fabric.api import local,lcd
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from fabric.utils import abort
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import os
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from distutils.version import LooseVersion as V
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from subprocess import check_output
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pjoin = os.path.join
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static_dir = 'static'
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components_dir = os.path.join(static_dir, 'components')
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min_less_version = '1.4.0'
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max_less_version = '1.5.0' # exclusive
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def css(minify=True, verbose=False):
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"""generate the css from less files"""
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for name in ('style', 'ipython'):
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source = pjoin('style', "%s.less" % name)
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target = pjoin('style', "%s.min.css" % name)
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_compile_less(source, target, minify, verbose)
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def _to_bool(b):
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if not b in ['True', 'False', True, False]:
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abort('boolean expected, got: %s' % b)
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return (b in ['True', True])
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def _compile_less(source, target, minify=True, verbose=False):
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"""Compile a less file by source and target relative to static_dir"""
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minify = _to_bool(minify)
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verbose = _to_bool(verbose)
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min_flag = '-x' if minify is True else ''
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ver_flag = '--verbose' if verbose is True else ''
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# pin less to 1.4
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try:
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out = check_output(['lessc', '--version'])
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except OSError as err:
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raise ValueError("Unable to find lessc. Please install lessc >= %s and < %s " \
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% (min_less_version, max_less_version))
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out = out.decode('utf8', 'replace')
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less_version = out.split()[1]
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if V(less_version) < V(min_less_version):
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raise ValueError("lessc too old: %s < %s. Use `$ npm install lesscss@X.Y.Z` to install a specific version of less" % (less_version, min_less_version))
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if V(less_version) >= V(max_less_version):
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raise ValueError("lessc too new: %s >= %s. Use `$ npm install lesscss@X.Y.Z` to install a specific version of less" % (less_version, max_less_version))
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with lcd(static_dir):
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local('lessc {min_flag} {ver_flag} {source} {target}'.format(**locals()))
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