LazySass: Emmet-Based Mixins in Sass

I’m so lazy that I forgot to write any post on this website for last few months… And this post will be about my laziness as well :).

Ive been working on my blog’s new skin for last few months - last few months because of lots of projects on board. What I’ve made during working on this projects was creating own small framework. This is not that kind of frameworks which are worldwide known like Foundation or Bootstrap. It is rather related with writing own atomic mixins in SASS to smaller down the code flood in the project. I’ve based it on Emmet project a little bit and counting of units from Foundation project (pixels to rems).

LazySASS The idea

Project was started during writing of my book "Professional CSS3" (published by PACKT Publishing) and was called as a single file _shorts.sass. It was a collection of short forms of well known CSS rules.

=tdn
    text-decoration: none

=tdu
    text-decoration: uppercase

=tac
    text-align: center

=tar
    text-align: right

=tal
    text-align: left

=ttu
    text-transform: uppercase

=ttl
    text-transform: lowercase

=di
    display: inline

=db
    display: block

=dib
    display: inline-block

=m0a
    margin: 0 auto

It was used to shorten the most known CSS rules in final code like:

.className
  +di // display: inline-block
  +tac // text-align: center
  +ttu // text-transform: uppercase

Yeah… pretty small change and… unreadable. Creates additional stack of unknown rules… looks like additional new language. But who is not working with EMMET (previously known as ZenCoding)? It’s not another new language just based on EMMET basics.

Next step - LazySASS extended

Next problem which for me was the most repeatable were correct units. Ive sticked to REM instead of Pixels which made layout more adjustable. Ive been using remCalc() which was changing pixels to REM’s. But the problem is repeating of this function. Lets define remCalc in SASS:

@function remCalc($value)
   $rem: $value / 16px
   @return #{$rem}rem

So each time when I wanted to apply the REM value I needed to invoke function:

h1
  font-size: remCalc(32px)

This generated:

h1 {
  font-size: 2rem;
}

But… what if I wanted to change the font for example to 21px and it gives me 1.3125rem? In inspector its hard to multiply it and know what was the base of this equation. Ive been moving from one unit to another but it could be based on one variable kept globally and one mixin:

$UNIT_REM: true // pixels / rems

@function _countUnits($value)
  @if ($UNIT_REM)
    $rem: $value / 16px
    @return #{$rem}rem
  @else
    @return $value

Now we need to apply mixins which converts pixels to rems like this:

=mt($value)
  margin-top: _countUnits($value)

=ml($value)
  margin-left: _countUnits($value)

=mr($value)
  margin-right: _countUnits($value)

=mb($value)
  margin-bottom: _countUnits($value)

Each time when you want to change it to pixels you are setting $UNIT_REM to false. Now it is easier to inspect the size units.

Let’s summarize

So now when you want to describe element you can use code like this:

.single_article__book__content
  +posa
  +t(0px)
  +w(470px)

.single_article__book__img
  +r(0px)
  +t(0px)
  +fr
  +posr

... will compile to:

.single_article__book__content {
  position: absolute;
  top: 0;
  width: 465px;
}
.single_article__book__img {
  right: 0;
  top: 0;
  float: right;
  position: relative;
}

…or:

.single_article__book__content {
  position: absolute;
  top: 0rem;
  width: 29.375rem;
}

.single_article__book__img {
  right: 0rem;
  top: 0rem;
  float: right;
  position: relative;
}

… in case of setted units to REM’s.

LazySASS

Code of LazySASS is available here: https://github.com/fedojo/LazySASS/blob/master/_shorts.sass!