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Test case for setting only lower or upper, no sensible default so should be an error
Test case for setting only lower or upper, no sensible default so should be an error

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fabfile.py
85 lines | 3.3 KiB | text/x-python | PythonLexer
""" fabfile to prepare the notebook """
from fabric.api import local,lcd
from fabric.utils import abort
import os
from distutils.version import LooseVersion as V
from subprocess import check_output
pjoin = os.path.join
static_dir = 'static'
components_dir = pjoin(static_dir, 'components')
here = os.path.dirname(__file__)
min_less_version = '1.7.0'
max_less_version = '1.8.0' # exclusive
def _need_css_update():
"""Does less need to run?"""
static_path = pjoin(here, static_dir)
css_targets = [
pjoin(static_path, 'style', '%s.min.css' % name)
for name in ('style', 'ipython')
]
css_maps = [t + '.map' for t in css_targets]
targets = css_targets + css_maps
if not all(os.path.exists(t) for t in targets):
# some generated files don't exist
return True
earliest_target = sorted(os.stat(t).st_mtime for t in targets)[0]
# check if any .less files are newer than the generated targets
for (dirpath, dirnames, filenames) in os.walk(static_path):
for f in filenames:
if f.endswith('.less'):
path = pjoin(static_path, dirpath, f)
timestamp = os.stat(path).st_mtime
if timestamp > earliest_target:
return True
return False
def css(minify=False, verbose=False, force=False):
"""generate the css from less files"""
minify = _to_bool(minify)
verbose = _to_bool(verbose)
force = _to_bool(force)
# minify implies force because it's not the default behavior
if not force and not minify and not _need_css_update():
print("css up-to-date")
return
for name in ('style', 'ipython'):
source = pjoin('style', "%s.less" % name)
target = pjoin('style', "%s.min.css" % name)
sourcemap = pjoin('style', "%s.min.css.map" % name)
_compile_less(source, target, sourcemap, minify, verbose)
def _to_bool(b):
if not b in ['True', 'False', True, False]:
abort('boolean expected, got: %s' % b)
return (b in ['True', True])
def _compile_less(source, target, sourcemap, minify=True, verbose=False):
"""Compile a less file by source and target relative to static_dir"""
min_flag = '-x' if minify is True else ''
ver_flag = '--verbose' if verbose is True else ''
# pin less to version number from above
try:
out = check_output(['lessc', '--version'])
except OSError as err:
raise ValueError("Unable to find lessc. Please install lessc >= %s and < %s " \
% (min_less_version, max_less_version))
out = out.decode('utf8', 'replace')
less_version = out.split()[1]
if V(less_version) < V(min_less_version):
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))
if V(less_version) >= V(max_less_version):
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))
static_path = pjoin(here, static_dir)
with lcd(static_dir):
local('lessc {min_flag} {ver_flag} --source-map={sourcemap} --source-map-basepath={static_path} --source-map-rootpath="../" {source} {target}'.format(**locals()))