19 Feb
2014
19 Feb
'14
3:32 p.m.
Notes:
1/
It is possible to not use theses pre-processors and to still be able to use
bootstrap, as a pre-computed CSS file.
I don't think it is a good idea, because LESS provides a good solution to
customize the bootstrap implementation, by overriding the variables.less
file. This file defines the default colors, fonts, etc...
Also, the Junco skin [1] requires LESS to be built, because it uses the
LESS features to bind the bootstrap classes to the legacy xwiki ones. We
can build it locally and only commit the results file, but I don't think it
is elegant.
And it means that the XWiki instance would not be able to provide such a
skin during the runtime.
2/
Both of these pre-processors have an "include" feature, that would be
difficult to implement with our SSX objects system.
Thanks,
Louis-Marie
[1] http://extensions.xwiki.org/xwiki/bin/view/Extension/Junco+Skin
2014-02-19 11:09 GMT+01:00 Ecaterina Moraru (Valica) <valicac(a)gmail.com>om>:
Hi,
Some other opinions?
Thanks,
Caty
On Wed, Jan 29, 2014 at 11:42 AM, Guillaume "Louis-Marie" Delhumeau <
gdelhumeau(a)xwiki.com> wrote:
complex
functionality.
API
Velocity).
logic
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One more thing:
= Cient-Side compilation =
LESS is written in javascript. It is possible to "compile" a .less file
to
.css on the server-side, but it is also possible
to do it on the
client-side (see: http://www.lesscss.org/#usage ).
In my opinion, it should be always done server-side, but except in one
case:
in the color theme editor.
In this case, it is possible to use the JS API of LESS in the browser:
less.modifyVars({
'@buttonFace': '#5B83AD',
'@buttonText': '#D9EEF2'
});
In this example, it changes the color or every buttons on the fly.
= Integration with java =
Some links:
* Official LESS CSS Compiler for Java
** https://github.com/marceloverdijk/lesscss-java
** The compiler uses Rhino, Envjs (simulated browser environment written
in
JavaScript), and the official LESS JavaScript
compiler.
Example of use:
// Instantiate the LESS compiler
LessCompiler lessCompiler = new LessCompiler();
// Compile LESS input string to CSS output string
String css = lessCompiler.compile("@color: #4D926F; #header { color:
@color; }");
// Or compile LESS input file to CSS output file
lessCompiler.compile(new File("main.less"), new File("main.css"));
* LessCSS4j
** https://github.com/localmatters/lesscss4j
** the author claims it has better performances that the official
compiler.
Example of use:
StyleSheetResource resource = new FileStyleSheetResource(filename);
LessCssCompiler compiler = new DefaultLessCssCompilerFactory().create();
compiler.compile(resource, System.out, null);
* Sass-Java:
** https://github.com/darrinholst/sass-java
** "Compiles sass to css on-the-fly with compass
<http://compass-style.org/>via a j2ee servlet filter".
** Not sure if we can use it.
* Others java compilers for sass look dead.
Louis-Marie
2014-01-28 Guillaume "Louis-Marie" Delhumeau <gdelhumeau(a)xwiki.com>
> Just my 2 cents:
>
> = About variables =
> - in LESS, variables are prefixed by @:
> @defaultColor: #004400;
>
> - in SASS, variables are prefixed $, just like velocity:
> $defaultColor: #004400;
>
> So, if we use velocity and SASS, what $defaultColor is? A velocity
> variable? A sass variable?
>
> We can escape the $ to make the distinction between sass and velocity
> variables, but it is not very friendly.
>
> = About mixins =
> Mixins are kind of macros, that we have in velocity. I prefer the
> implementation of SASS than LESS. The logical operations seem better in
> SASS too.
> See: http://css-tricks.com/sass-vs-less/
>
> Louis-Marie
>
>
> 2014-01-28 Ecaterina Moraru (Valica) <valicac(a)gmail.com>
>
> Hi,
>>
>> As part of the 6.0 Roadmap we have as entry the creation/integration
of
a
prefix
> new Skin inside XWiki.
>
> Currently there are 2 proposals for the new skin:
> Flamingo http://design.xwiki.org/xwiki/bin/view/Improvements/Skin4x
> Junco http://design.xwiki.org/xwiki/bin/view/Proposal/JuncoSkin
>
> Both proposals are done using Twitter's Bootstrap framework (
> http://getbootstrap.com).
> Bootstrap officially is written using Less ( http://www.lesscss.org/)
> and
> is the default pre-processor they support. There is also a Sass (
> http://sass-lang.com/ ) version for Bootstrap (
> https://github.com/twbs/bootstrap-sass ) so the idea is that the
> preprocessor variant is not limiting us in integrating Bootstrap.
>
> The question we discuss in this thread is what preprocessor we should
> integrate in platform when we integrate Bootstrap (that in the case we
> integrate either of these tools).
>
> Currently Junco's extension is done with Bootstrap + Less. My decision
to
> use this combination was done after a light
research and mostly based
on a
>> personal preference of the Less language.
>>
>> We are having this preprocessors discussion so late (they appeared in
>> 2007-2009) because we didn't really need a preprocessor until now. The
>> base
>> functionality they add we solved by using Velocity (we have CSS3 >> macros defined in macro.vm that are
similar to the compatibility
mixins
>> provided by Bootstrap, we have also a
ColorThemes variables solution
for
>
reusing color values and because we can have Velocity code inside our
> stylesheets we cover most of the functions&operations need).
>
> The only downside for us using Velocity to do these kind of things is
that
>> the functionality we cover is very basic and was done only if we had a
>> certain need. This is not necessarily a bad thing but it's kind of a
>> limitation for external developers that might want to make more >
things. Less and Sass community members are very active and they make
sure
> their functionality is tested and covers most
of the cases. Also there
are
> some features (like extends, etc.) that would
be hard for us to
duplicate
> in Velocity.
>
> Just as a note, adding Less doesn't mean we are replacing Velocity. We
are
>> just replacing the CSS things done in Velocity with Less >
Replacing Velocity with another templating engine should be the topic
for
>> another thread (in case we are considering this).
>>
>> If we integrate Less, what is currently done with CSS+Velocity will be
>> done
>> using Less(CSS)+Velocity(less code).
>> If we integrate Sass (because Sass also has control directives) we
>> transform CSS+Velocity in Sass(CSS)+Velocity(even less code) but the > calls
will still need to be added with Velocity (so still we will not
have
> just Sass).
>
> One of the problems with the preprocessors is that they depend on
> Javascript or Ruby (there are some versions also on Java in case of
Sass,
> but not officially maintained). So first we
need to find a solution to
> compile Less/Scss files into CSS, inside our platform.
>
> If you make a Google search you'll see that there are much more
> 'recommendations' to pick Sass over Less. One remark regarding this is
> that
> we need to understand that right now Sass is used on a different
> technologies stack (mostly for Ruby applications). Sass is very
attractive
> because of its power. But what we need to ask
ourselves is if we need
the
>> full power of Sass (because some of it is already covered by >
> Personally I prefer Less, but that's because of the separation of
concerns
>> (structure, presentation, behavior). I prefer the limitations Less has
>> (regarding control structure) in order to not be tempted to write >> with a language that is not supposed to
do that (even though it can).
>> Preprocessors should be used exclusively to write CSS and especially
to
>> write it more rapid (nesting, mixins).
>> Also Less syntax is more close to default CSS syntax, which IMO is a
big
>> plus.
>>
>> But because of its power, Sass could be in the future the new
'JQuery',
> since
right now it has a bigger community. One of the advantages of
> picking
> a technology later is that at least you see some clear candidates (and
we
don't
need to consider other preprocessors like Stylus, etc.).
Let me know what you think.
Thanks,
Caty
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