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Hi all,

I've started working on updating Bootstrap to version 3 in Horizon. 
https://blueprints.launchpad.net/horizon/+spec/bootstrap-update

As I have described in blueprint whiteboard, I am experiencing compile 
problems with the new lesscpy compiler that we started using recently. 
The compiled css code is incorrect and when running the compilation from 
terminal, about 200 syntax errors occur. This is related to certain 
features of Less not being supported by lesscpy. I have created a GIthub 
issue for lesscpy here: https://github.com/robotis/Lesscpy/issues/22 .

Sasha Peilicke has already started working on updating the lesscpy 
library to support all less features needed to compile Bootstrap 3 
properly. Although I think that it will take more than a few weeks 
before lesscpy is there where we need it.

I have part of Bootstrap 3 update ready and as it is quite a large patch 
I would like to get this in as soon as possible because any rebase to a 
new Horizon master is quite tedious process. Also there are another 
blueprints that depend on this update (font-icons and css-breakdown, see 
dependency tree).

So I would like to propose to revert the patch that introduces lesscpy 
library (a0739c9423 Drop NodeJS dependency in favor of pure-python 
lesscpy) and use the lessc library for the time being untill lesscpy is 
capable of compiling Bootstrap 3.

I have revert patch ready together with update of lessc library in 
horizon/bin, which I can make part of Bootstrap-update blueprint and 
send them right away to gerrit for a review. I have also tested that 
with this setup the Bootstrap 3 updated Horizon less file compiles properly.

When lesscpy is ready to support Bootstrap 3, geting back to lesscpy is 
then simple process of just reapplying the reverted commit.

-- Jirka Tomasek



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