django management command + yui compressor

Can I call yui compressor: java -jar yuicompressor-x.y.z.jar [options] [input file] from a django management command and if so how do I go about doing it?

I develop locally on Window and host on Linux,开发者_运维知识库 so this seem like a solution that will work on both.

To expand on Van Gale's answer, it's most certainly possible. Here are the ingredients:

• An app that is in INSTALLED APPS
• The proper directory structure
• A python file to act as the command which inherits off of a Django management command class

Here's generally how this works...

When manage.py runs, if it does not find the command say "manage.py yui_compress" it searches through the installed apps. It looks in each app to see if app.management.commands exists, and then checks if there is a file "yui_compress.py" in that module. If so, it will initiate the class in that python file and use that.

So, it ends up looking like this...

app
   \management
        \commands
            yui_compress.py

Where yui_compress.py contains...

from django.core.management.base import NoArgsCommand

class Command(NoArgsCommand):
    help = "Does my special action."
    requires_model_validation = False

    def handle_noargs(self, **options):
        # Execute whatever code you want here
        pass

Of course 'app' needs to be in thE INSTALLED APPS inside of settings.py.

But then, Van does make a good suggestion to find a tool which already does what you want. :)

Yes, but you have to write the command part yourself. The best way to go about this would be to see how the stock commands are implemented or look at a project like django-command-extensions

However, an even better solution (i.e. less work) would be to use a project like django-compress that already defines a management command synccompress that will call yui compressor.

I recently added a YUI Compressor processor to django-mediasync.

If you'd like to use django-mediasync itself, here's the project page: https://github.com/sunlightlabs/django-mediasync

If you'd like to see the YUI Compressor command as a reference, here's a copy/paste from it (in case the paths change in the future)...

from django.conf import settings
import os
from subprocess import Popen, PIPE

def _yui_path(settings):
    if not hasattr(settings, 'MEDIASYNC'):
        return None
    path = settings.MEDIASYNC.get('YUI_COMPRESSOR_PATH', None)
    if path:
        path = os.path.realpath(os.path.expanduser(path))
    return path

def css_minifier(filedata, content_type, remote_path, is_active):
    is_css = (content_type == 'text/css' or remote_path.lower().endswith('.css'))
    yui_path = _yui_path(settings)
    if is_css and yui_path and is_active:
        proc = Popen(['java', '-jar', yui_path, '--type', 'css'], stdout=PIPE,
                     stderr=PIPE, stdin=PIPE)
        stdout, stderr = proc.communicate(input=filedata)
        return str(stdout)

def js_minifier(filedata, content_type, remote_path, is_active):
    is_js = (content_type == 'text/javascript' or remote_path.lower().endswith('.js'))
    yui_path = _yui_path(settings)
    if is_js and yui_path and is_active:
        proc = Popen(['java', '-jar', yui_path, '--type', 'js'], stdout=PIPE,
                     stderr=PIPE, stdin=PIPE)
        stdout, stderr = proc.communicate(input=filedata)
        return str(stdout)