update source URL extension to handle listing blocks in addition to source blocks

Author: mojavelinux

gulp.d/tasks/build-preview-pages.js

@@ -111,8 +111,8 @@ module.exports = (src, previewSrc, previewDest, sink = () => map()) => (done) =>
                     .convert()
                     // NOTE emulates the behavior of the view source url extension
                     .replace(
-                      /<pre([^>]+)><code([^>]+)>\[data-source-url=(.+?)\]\n/g,
-                      '<pre$1><code$2 data-source-url="$3">'
+                      /<pre([^>]*)(><code[^>]*)?>\[data-source-url=(.+?)\]\n/g,
+                      '<pre$1$2 data-source-url="$3">'
                     )
                 )
               }