//** Grid Settings **//

//**
  Your basic units for the grid
!grid_unit ||= "em"
!total_cols ||= 16
!col_width ||= 4
!gutter_width ||= 1
!side_gutter_width ||= !gutter_width
!container_width = container(!total_cols, !col_width, !gutter_width, !side_gutter_width)


//** 
  set on the outer grid containing element.
=container(!align = "left")
  //  clear all floated columns
  +clearfix
  //  align the text back to the left (override for other alignments)
  :text-align= !align
  //  use auto horizontal margins to center your page in the body
  :margin
    :left auto
    :right auto
  //  set the page width based on column settings
  :width= !container_width + !grid_unit
  //  never exceed 100% of the browser window (no side-scrolling)
  :max-width 100%


//** 
  set on any column element, even nested ones.
  the first agument [required] is the number of columns to span
  the second argument is the context (columns spanned by parent)
  this is required in any nested context
  by default a grid-col is floated left with a right gutter
  override that with +float("right"), +first or +last
=columns(!n, !context = false)
  //  the width of the column is set as a percentage of the context
  :width= columns(!n, !context) + "%"
  //  the column is floated left
  +float("left")
  //  the right gutter is added as a percentage of the context
  :margin-right= gutter(!context) + "%"

//** 
  set on any column to add empty colums before or after
=prefix(!n, !context = false)
  :padding-left= columns(!n, !context) + gutter(!context) + "%"

=suffix(!n, !context = false)
  :padding-right= columns(!n, !context) + gutter(!context) + "%"

//**
  set as shortcut for prefix and suffix
=pad(!p = 0, !s = 0, !c = false)
  @if !p != 0
    +prefix(!p,!c)
  @if !s != 0
    +suffix(!s,!c)

//**  
  set on any element spanning the first column in non-nested context
  to take side-gutters into account
=alpha(!nested = false)
  @if !nested == false
    :margin-left= side_gutter() + "%"

//**
  when global constant !hacks == true:
  - this will be called automatically with hacks
  when global constant !hacks == false:
  - you can call it yourself in ie.sass without the hacks
=ie-omega(!nested = false, !right = false, !hack = false)
  !s = side_gutter()
  @if !right
    @if !hack
      :#margin-left -1%
    @else
      :margin-left -1%
  @else
    @if !nested
      @if !hack
        :#margin-right -1%
      @else
        :margin-right -1%
    @else
      @if !hack
        :#margin-right= !s - 1 + "%"
      @else
        :margin-right= !s - 1 + "%"

//**  
  set on the last element of a row to take side-gutters into account
  - set !nested for nested columns
  - set !float for right-floated omega elements
=omega(!nested = false, !right = false)
  !s = side_gutter()
  @if !nested
    :margin-right 0
  @else
    :margin-right= !s + "%"
  @if !hacks
    /* ugly hacks for IE6-7 */
    +ie-omega(!nested, !right,"*")
    /* end ugly hacks */
    
//**
  set on an element that will span it's entire context
  - no need for +columns, +alpha or +omega on a +full element
=full(!nested = false)
  :clear both
  @if !nested == false
    !s = side_gutter() + "%"
    margin-right= !s
    margin-left= !s