Position mixin accepts upto 4 arguments and supports 'auto' & 'inherit' values

lib/nib/positions.styl

@@ -1,10 +1,63 @@
 // helper
 
+-type(prop)
+
+  type  = 'ident'
+  types = 'auto' 'inherit'
+
+  if prop is a 'unit'
+    type = 'unit'
+
+  if prop in types
+    type = 'unit'
+
+  return type
+
+-keys(props)
+
+  props = arguments if length(arguments) > 1
+  keys  = ()
+
+  for prop in props
+    if -type(prop) is 'ident'
+      push(keys, prop)
+
+  return keys
+
+-vals(props)
+
+  props  = arguments if length(arguments) > 1
+  vals   = ()
+  length = length(props)
+
+  for prop, i in props
+
+    type = -type(prop)
+
+    if type is 'unit'
+      push(vals, prop)
+    else
+      if previous is defined
+        unless -type(previous) is 'unit'
+          push(vals,0)
+
+      if (i+1) == length
+        push(vals,0)
+
+    previous = prop
+
+  return vals
+
 -pos(type, args)
-  i = 0
+
+  keys = -keys(args)
+  vals = -vals(args)
+
   position: unquote(type)
-  {args[i]}: args[i + 1] is a 'unit' ? args[i += 1] : 0
-  {args[i += 1]}: args[i + 1] is a 'unit' ? args[i += 1] : 0
+
+  for key, i in keys
+    {key}: vals[i];
+
 
 /*
  * Position utility.
@@ -19,7 +72,9 @@
  *     fixed: top 5px left
  *     fixed: top left 5px
  *     fixed: top 5px left 5px
- * 
+ *     fixed: top 5px left 5px right auto
+ *     fixed: top 5px left 5px right auto bottom inherit
+ *
  */
 
 fixed()

test/cases/positions.css

@@ -0,0 +1,59 @@
+#fixed-0 {
+  position: fixed;
+  bottom: 0;
+  right: 0;
+}
+#fixed-1 {
+  position: fixed;
+  top: 5px;
+  left: auto;
+}
+#fixed-2 {
+  position: fixed;
+  bottom: 0;
+  left: 10px;
+}
+#fixed-3 {
+  position: fixed;
+  bottom: 10px;
+  right: 0;
+}
+#fixed-4 {
+  position: fixed;
+  bottom: 0;
+  right: 0;
+  left: 0;
+}
+#fixed-5 {
+  position: fixed;
+  bottom: 0;
+  right: 5px;
+  left: 5px;
+}
+#fixed-6 {
+  position: fixed;
+  bottom: 10px;
+  right: 5px;
+  left: 5px;
+}
+#fixed-7 {
+  position: fixed;
+  top: 0;
+  bottom: 0;
+  right: 0;
+  left: 0;
+}
+#fixed-8 {
+  position: fixed;
+  top: 0;
+  bottom: auto;
+  right: 0;
+  left: 5px;
+}
+#fixed-9 {
+  position: fixed;
+  top: auto;
+  bottom: 10px;
+  right: inherit;
+  left: 5px;
+}

test/cases/positions.styl

@@ -0,0 +1,32 @@
+
+@import 'nib/positions'
+
+#fixed-0
+  fixed: bottom right
+
+#fixed-1
+  fixed: top 5px left auto
+
+#fixed-2
+  fixed: bottom left 10px
+
+#fixed-3
+  fixed: bottom 10px right
+
+#fixed-4
+  fixed: bottom right left
+
+#fixed-5
+  fixed: bottom right 5px left 5px
+
+#fixed-6
+  fixed: bottom 10px right 5px left 5px
+
+#fixed-7
+  fixed: top bottom right left
+
+#fixed-8
+  fixed: top bottom auto right left 5px
+
+#fixed-9
+  fixed: top auto bottom 10px right inherit left 5px

test/runner.js

@@ -34,6 +34,6 @@ describe('integration', function(){
         if (err) throw err;
         actual.trim().should.equal(css);
       });
-    })
+    });
   });
-})
+});