Awesome. Will part of this change allow us to define nested mixins as well?

On Dec 16, 2009, at 2:32 PM, Chris Eppstein wrote:

> Nathan and I did chat and agreed to re-introduce the nested import 
> functionality. Such files will need to be 100% valid on their own, even if 
> they are only ever imported. This change has to be done right, with proper 
> variable and mixin scopes, etc. Also, new test cases need to be written.
> 
> The reason I became sold about this feature was actually for a whole 
> different reason than was mentioned: It becomes an effective way for users to 
> manage the otherwise global namespace of mixins. 
> 
> If the changeset for this is relatively straightforward, then I think this 
> will be a candidate for a 2.2 patch release, otherwise it'll need to wait for 
> 2.4.
> 
> chris
> 
> On Mon, Dec 14, 2009 at 3:08 PM, Chris Eppstein <[email protected]> wrote:
> Thanks, I understand your use case. It looks like Nathan and I need to chat a 
> little.
> 
> Chris
> 
> 
> On Mon, Dec 14, 2009 at 2:35 PM, Tim Underwood <[email protected]> wrote:
> Each site has a styles.sass that contains any customizations and then
> includes the shared styles (usually just a whitelabel.sass that is
> similar to the example below).  I have about 2 dozen Sass variables
> that can be overridden to control various colors (link colors,
> backgrounds, borders, etc...) and about a dozen Sass mixins that can
> be re-defined to control link behavior (color, text-decoration, hover,
> etc...).  The variables and mixins are the bulk of the customizations
> but a few of the sites have additional styles that aren't configurable
> via variables or mixins.
> 
> -Tim
> 
> On Dec 14, 2:05 pm, Chris Eppstein <[email protected]> wrote:
> > Tim,
> >
> > That's quite a setup. Is there any per-site styling or are you basically
> > just generating two sets of CSS, one for white-labels and one for your own
> > site?
> >
> > chris
> >
> > On Mon, Dec 14, 2009 at 1:43 PM, Tim Underwood 
> > <[email protected]>wrote:
> >
> >
> >
> > > Fair enough.  First off let me say that I love Sass.  Without it my
> > > whole setup wouldn't work and would just be a big mess.  So a big
> > > THANKS to the developers!
> >
> > > My use case is probably somewhat unique.  I run FrugalMechanic.com
> > > where we power ~100 whitelabel versions of our website for partners
> > > (e.g. autoparts.allaboutprius.com, autoparts.mustangblog.com,
> > > autoparts.carzi.com).  The easiest way to build the whitelabels is to
> > > embed our content into their stock html/css.  For this to work I make
> > > extensive use of the nested @import's to avoid css selector conflicts
> > > with their stock css by making sure all of my css selectors are more
> > > specific than theirs.
> >
> > > I currently have 126 sass files with 265 @import statements (some
> > > nested, some not).  The sass files that are used for the @imports
> > > (both nested and non-nested) are all used as partials and kept in a
> > > separate directory to avoid confusion with the sass files that are
> > > actually used to generate the final css used by the browser.
> >
> > > I *personally* think the nested @import approach is cleaner because
> > > it's more concise and less error prone (for me at least).
> >
> > > As a very simplified example, for frugalmechanic I have something like
> > > this at the top level:
> >
> > > @import yui-resets.sass
> > > @import base.sass
> > > @import styles.sass
> >
> > > For the whitelabels (where I nest all the rules) it looks something
> > > more like:
> >
> > > #frugalmechanic
> > >  @import yui-resets.sass
> > >  @import base.sass
> > >  @styles.sass
> >
> > > Going the mixin route would mean changing the first one
> > > (frugalmechanic) to:
> >
> > > @import yui-resets.sass
> > > @import base.sass
> > > @import styles.sass
> >
> > > +base
> > > +yui_resets
> > > +styles
> >
> > > And a whitelabel would look like:
> >
> > > @import yui-resets.sass
> > > @import base.sass
> > > @import styles.sass
> >
> > > #frugalmechanic
> > >  +yui_resets
> > >  +base
> > >  +styles
> >
> > > So for frugalmechanic I've gone from 3 lines of code to 6 and the
> > > whitelabels have gone from 4 to 7 for this simplified example.
> > > Multiply that by my 265 @import statements and that adds quite a bit
> > > of code that IMHO doesn't add any value.
> >
> > > However, I think the change I'm more concerned about is needing to add
> > > the mixin definition to the top of all my @import'ed sass files and
> > > indenting the entires contents of the file by 2 spaces.  The 2 space
> > > indenting makes those files less readable and more error prone since
> > > if I mess up the indent I'll have styles escaping my nested rules
> > > (which can be hard to debug).
> >
> > > -Tim
> >
> > > On Dec 14, 11:13 am, Chris Eppstein <[email protected]> wrote:
> > > > It was intentionally taken away because, as I understand it, it was 
> > > > never
> > > > intended to work.
> >
> > > > I respect that you think this is a cleaner implementation, but I
> > > disagree. I
> > > > think it's very confusing. Mixins are how you indicate that a particular
> > > > block of styles are going to be nested into other selectors. Why do we
> > > need
> > > > two mechanisms for mixing? If I open up index_page_nested_rules.sass
> > > there's
> > > > nothing about that file that tells me how it's going to be used except,
> > > > maybe, a comment if you thought to add one. If I see one or more mixins
> > > > defined there, I understand, I have to go looking for where they are
> > > used.
> >
> > > > Perhaps there is some use case I haven't considered, so I'll welcome you
> > > to
> > > > state your case for why you think this approach is better than @import +
> > > > mixins.
> >
> > > > Chris
> >
> > > > On Mon, Dec 14, 2009 at 10:17 AM, Tim Underwood <[email protected]
> > > >wrote:
> >
> > > > > In Haml/Sass 2.0.9 I'm able to do something like this:
> >
> > > > > .index_page
> > > > >  @import index_page_nested_rules.sass
> >
> > > > > .results_page
> > > > >  @import results_page_nested_rules.sass
> >
> > > > > And then everything in index_page_nested_rules.sass was nested within
> > > > > my index_page class. But in Haml/Sass 2.2.15 I get this error:
> >
> > > > > "Sass::SyntaxError: Import directives may only be used at the root of
> > > > > a document."
> >
> > > > > Was support for this intentionally taken away?  Is there another way
> > > > > to accomplish the same thing?  Mixins kind of work but aren't as clean
> > > > > as the nested @import's.
> >
> > > > > Thanks,
> >
> > > > > -Tim
> >
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