Further minify non-visible JavaScript.

Further minify non-visible JavaScript.

This imports a Python version of Douglas Crockford's JSMin.  JavaScript files can annotate that they want to be run through the minifier.  Currently debug and mirror are minified.

This results in ~12k savings on the final binary size.

[Dean McNamee, 2009-01-27 13:33:20]

The way I wrote the code is kinda ugly.  Feel free to give me input, I could
move the annotation code into CompressScript() if it's cleaner.

Additionally, I have an idea in the future to allow you to annotate sections of
code instead of a while file.  Basically the idea is within a .js, you could
group the code that would be user visible and the code that wouldn't (all of the
helpers, global variables, etc).  Then we can fully compress everything except
the code that we want for .toString() output.  I expect this will be a
worthwhile savings.

[Christian Plesner Hansen, 2009-01-27 14:07:09]

You should add an entry for jsmin in the top-level LICENSE file.  Otherwise
lgtm.

I'm not sure fine-grained compression/no-compression control is a good idea.  It
might be better to add a flag to scons that forces compression for all js files;
on a small machines you're probably willing to trade readability of user-visible
function sources for space.

[Dean McNamee, 2009-01-27 14:15:45]

I don't see the point of leaving non-visible code not-minified, even on desktop
systems.  It's just a waste of space.  We can worry about that later.

I added an entry to LICENSE, let me know if it looks ok.

On 2009/01/27 14:07:09, Christian Plesner Hansen wrote:
> You should add an entry for jsmin in the top-level LICENSE file.  Otherwise
> lgtm.
> 
> I'm not sure fine-grained compression/no-compression control is a good idea. 
It
> might be better to add a flag to scons that forces compression for all js
files;
> on a small machines you're probably willing to trade readability of
user-visible
> function sources for space.

[Mads Ager (chromium), 2009-01-27 16:28:37]

LGTM as well.