made sass mixin arguments more flexible

lib/templates/system.template

@@ -1,8 +1,3 @@
-<% if (preprocessor.engine === 'sass') { %>
-=<%= preprocessor.namespace %>system-block($mixin, $name)
-  #{$mixin + '(' + $name + ')'}
-    @content
-<% } %>
 <% _.each(mixins, function(name, mixin) { %>
 <% if (preprocessor.engine === 'scss') { %>
 @mixin <%= preprocessor.namespace + name %>($names...) {
@@ -13,7 +8,10 @@
 <% } %>
 <% if (preprocessor.engine === 'sass') { %>
 =<%= preprocessor.namespace + name %>($names...)
-  +<%= preprocessor.namespace %>system-block(<%= name %>, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'<%= preprocessor.namespace + name %>(' + $all + ')'}
     @content
 <% } %>
 <% if (preprocessor.engine === 'stylus') { %>

test/fixtures/mixins/system-custom.sass

@@ -1,24 +1,42 @@
-=system-block($mixin, $name)
-  #{$mixin + '(' + $name + ')'}
-    @content
 =new($names...)
-  +system-block(new, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'new(' + $all + ')'}
     @content
 =part($names...)
-  +system-block(part, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'part(' + $all + ')'}
     @content
 =option($names...)
-  +system-block(option, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'option(' + $all + ')'}
     @content
 =state($names...)
-  +system-block(state, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'state(' + $all + ')'}
     @content
 =area($names...)
-  +system-block(area, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'area(' + $all + ')'}
     @content
 =tweak($names...)
-  +system-block(tweak, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'tweak(' + $all + ')'}
     @content
 =container($names...)
-  +system-block(container, $names)
-    @content
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'container(' + $all + ')'}
+    @content

test/fixtures/mixins/system-namespaced.sass

@@ -1,24 +1,42 @@
-=namespace-system-block($mixin, $name)
-  #{$mixin + '(' + $name + ')'}
-    @content
 =namespace-component($names...)
-  +namespace-system-block(component, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'namespace-component(' + $all + ')'}
     @content
 =namespace-has($names...)
-  +namespace-system-block(has, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'namespace-has(' + $all + ')'}
     @content
 =namespace-when($names...)
-  +namespace-system-block(when, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'namespace-when(' + $all + ')'}
     @content
 =namespace-is($names...)
-  +namespace-system-block(is, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'namespace-is(' + $all + ')'}
     @content
 =namespace-inside($names...)
-  +namespace-system-block(inside, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'namespace-inside(' + $all + ')'}
     @content
 =namespace-util($names...)
-  +namespace-system-block(util, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'namespace-util(' + $all + ')'}
     @content
 =namespace-container($names...)
-  +namespace-system-block(container, $names)
-    @content
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'namespace-container(' + $all + ')'}
+    @content

test/fixtures/mixins/system.sass

@@ -1,24 +1,42 @@
-=system-block($mixin, $name)
-  #{$mixin + '(' + $name + ')'}
-    @content
 =component($names...)
-  +system-block(component, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'component(' + $all + ')'}
     @content
 =has($names...)
-  +system-block(has, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'has(' + $all + ')'}
     @content
 =when($names...)
-  +system-block(when, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'when(' + $all + ')'}
     @content
 =is($names...)
-  +system-block(is, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'is(' + $all + ')'}
     @content
 =inside($names...)
-  +system-block(inside, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'inside(' + $all + ')'}
     @content
 =util($names...)
-  +system-block(util, $names)
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'util(' + $all + ')'}
     @content
 =container($names...)
-  +system-block(container, $names)
-    @content
+  $all: ()
+  @each $name in $names
+    $all: append($all, unquote($name), comma)
+  #{'container(' + $all + ')'}
+    @content