Hey,
Switching to SASS/Compass seems to me like a nice idea. Although reading
Compass docs on using it in django/python projects [1], they recommend
to serve compiled css in as output for production, so the production
servers don't have to carry ruby/compass gems dependencies.
Also in django project development, you need to run "compass --watch" if
you want scss to automatically compile and developers need to install
ruby environment with necessary gems.
Switching to sass/compass is a good thing as it resolves the issue with
nodejs dependency for less and also brings compass goodness into play. I
think this solution is a bit rough for a python/django developer though.
Independently on whether we choose to stick with less or change to sass,
we'll still need to add dependency (nodejs or ruby). What we need to
consider is whether we want to compile css in production or not.
Recently mentioned solution of separating css and js into separate
project that outputs compiled js and css comes into play. Problem with
sass/compass here I see is that we'll probably need nodejs dependency
for js tools like bower, grunt, js test suites etc. With sass/compass
we'd need additional Ruby dependency.
Jirka
[1] http://compass-style.org/blog/2011/05/09/compass-django/
On 02/05/2014 08:23 PM, Gabriel Hurley wrote:
I would imagine the downstream distros won't have the same problems with Ruby
as they did with Node.js from a dependency standpoint, though it still doesn't
jive with the community's all-Python bias.
My real concern, though, is anyone who may have extended the Horizon
stylesheets using the capabilities of LESS. There are lots of ways you can
customize the appearance of Horizon, and some folks may have gone that route.
My recommended course of action would be to think deeply on some recommended ways of
"upgrading" from LESS to SASS for existing deployments who may have written
their own stylesheets. Treat this like a feature deprecation (which is what it is).
Otherwise, if it makes people's lives better to use SASS instead of LESS, it
sounds good to me.
- Gabriel
-----Original Message-----
From: Jason Rist [mailto:jr...@redhat.com]
Sent: Wednesday, February 05, 2014 9:48 AM
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [Horizon] RFC - Suggestion for switching from
Less to Sass (Bootstrap 3 & Sass support)
On Wed 05 Feb 2014 09:32:54 AM MST, Jaromir Coufal wrote:
Dear Horizoners,
in last days there were couple of interesting discussions about
updating to Bootstrap 3. In this e-mail, I would love to give a small
summary and propose a solution for us.
As Bootstrap was heavily dependent on Less, when we got rid of node.js
we started to use lesscpy. Unfortunately because of this change we
were unable to update to Bootstrap 3. Fixing lesscpy looks problematic
- there are issues with supporting all use-cases and even if we fix
this in some time, we might challenge these issues again in the future.
There is great news for Bootstrap. It started to support Sass [0].
(Thanks Toshi and MaxV for highlighting this news!)
Thanks to this step forward, we might get out of our lesscpy issues by
switching to Sass. I am very happy with this possible change, since
Sass is more powerful than Less and we will be able to update our
libraries without any constraints.
There are few downsides - we will need to change our Horizon Less
files to Sass, but it shouldn't be very big deal as far as we
discussed it with some Horizon folks. We can actually do it as a part
of Bootstrap update [1] (or CSS files restructuring [2]).
Other concern will be with compilers. So far I've found 3 ways:
* rails dependency (how big problem would it be?)
* https://pypi.python.org/pypi/scss/0.7.1
* https://pypi.python.org/pypi/SassPython/0.2.1
* ... (other suggestions?)
Nice benefit of Sass is, that we can use advantage of Compass
framework [3], which will save us a lot of energy when writing (not
just cross-browser) stylesheets thanks to their mixins.
When we discussed on IRC with Horizoners, it looks like this is good
way to go in order to move us forward. So I am here, bringing this
suggestion up to whole community.
My proposal for Horizon is to *switch from Less to Sass*. Then we can
unblock our already existing BPs, get Bootstrap updates and include
Compass framework. I believe this is all doable in Icehouse timeframe
if there are no problems with compilers.
Thoughts?
-- Jarda
[0] http://getbootstrap.com/getting-started/
[1] https://blueprints.launchpad.net/horizon/+spec/bootstrap-update
[2] https://blueprints.launchpad.net/horizon/+spec/css-breakdown
[3] http://compass-style.org/
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I think this is a fantastic idea. Having no experience with Less, but seeing
that
it is troublesome - if we can use SASS/Compass, I'd be much more
comfortable with the switch. +1
--
Jason E. Rist
Senior Software Engineer
OpenStack Management UI
Red Hat, Inc.
+1.919.754.4048
Freenode: jrist
github/identi.ca: knowncitizen
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