pass filename option to filters

lib/parser.js

@@ -468,7 +468,7 @@ Parser.prototype = {
       var str = fs.readFileSync(path, 'utf8');
       var ext = extname(path).slice(1);
       var filter = filters[ext];
-      if (filter) str = filter(str).replace(/\\n/g, '\n');
+      if (filter) str = filter(str, {filename: this.filename}).replace(/\\n/g, '\n');
       return new nodes.Literal(str);
     }
 

test/cases/include-filter-stylus.html

@@ -0,0 +1,4 @@
+<style type="text/css">body {
+  padding: 10px;
+}
+</style>

test/cases/include-filter-stylus.jade

@@ -0,0 +1 @@
+include some.styl

test/cases/some-included.styl

@@ -0,0 +1,2 @@
+body
+  padding 10px

test/cases/some.styl

@@ -0,0 +1 @@
+@import "some-included"