A Jinja2 extension to compile and/or compress your assets.
pip install jacFor LESS and CSS support, install less:
npm install -g lessFor COFFEE support, install coffee-script:
npm install -g coffee-scriptFor Sass and SCSS support, install sass:
gem install sassJavaScript minification is built-in using the Python rJsmin package.
When installing on Mac OS X set this shell variable, because jac dependencies contain C code:
export CFLAGS=-Qunused-argumentsTo use it, you just have to put your css or js inside a compress tag.
{% compress 'css' %}
<style type="text/sass">
sass stuff
</style>
<link rel="stylesheet" type="text/sass" href="file.sass">
{% endcompress %}
{% compress 'js' %}
<script type="text/coffeescript">
coffee stuff
</script>
<script type="text/coffeescript" src="file.coffee"></script>
{% endcompress %}You just have to create an environment with jac on it and configure output dir, static prefix and say where it can find your sources.
import jinja2
from jac import CompressorExtension
env = jinja2.Environment(extensions=[CompressorExtension])
env.compressor_output_dir = './static/dist'
env.compressor_static_prefix = '/static'
env.compressor_source_dirs = './static_files'After that just use template = env.from_string(html); template.render() to get it done.
Where you configure your app, just do this:
from jac.contrib.flask import JAC
app = Flask(__name__)
app.config['COMPRESSOR_DEBUG'] = app.config.get('DEBUG')
app.config['COMPRESSOR_OUTPUT_DIR'] = './static/dist'
app.config['COMPRESSOR_STATIC_PREFIX'] = '/static'
jac = JAC(app)And you are done.
JAC supports compressing static assets offline, then deploying to a production server. Here is a command to compress your static assets if using Flask: :
python -m jac.contrib.flask my_flask_module:create_appReplace my_flask_module with the correct import path to find your Flask app.
The compressor_classes template env variable tells jac which compressor to use for each mimetype. The default value for compressor_classes is:
{
'text/css': LessCompressor,
'text/coffeescript': CoffeeScriptCompressor,
'text/less': LessCompressor,
'text/javascript': JavaScriptCompressor,
'text/sass': SassCompressor,
'text/scss': SassCompressor,
}To use an alternate compressor class, provide a class with a compile class method accepting arg text and kwargs mimetype, cwd, uri_cwd, and debug. For example, to use libsass-python for SASS files instead of the built-in SassCompressor, create your custom compressor class:
import sass
class CustomSassCompressor(object):
"""Custom compressor for text/sass mimetype.
Uses libsass-python for compression.
"""
@classmethod
def compile(cls, text, cwd=None, **kwargs):
include_paths = []
if cwd:
include_paths += [cwd]
return sass.compile(string=text, include_paths=include_paths)Then tell jac to use your custom compressor for text/sass mimetypes:
env.compressor_classes['text/sass'] = CustomSassCompressorThe equivalent for Flask is:
jac.set_compressor('text/sass', CustomSassCompressor)To only customize the path of a compressor which forks a subprocess for the compile step (LessCompressor, CoffeeScriptCompressor, and SassCompressor), just extend the compressor class and overwrite the binary class attribute:
from jac.compressors import SassCompressor
class CustomSassCompressor(SassCompressor):
"""Custom SASS compressor using Compass binary instead of libsass for text/sass mimetype.
Uses the faster libsass wrapper sassc for SASS compression.
https://github.com/sass/sassc
"""
binary = '/usr/bin/sassc'
# Tell Flask to use our custom SASS compressor
jac.set_compressor('text/sass', CustomSassCompressor)virtualenv venv
. venv/bin/activate
pip install -r requirements_tests.txt
make coverage
make lintOr use tox to run with multiple python versions:
pip install tox
tox
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