Add filename snippet

.vim/snips/pandoc.snippets

@@ -638,6 +638,10 @@ snippet sketch "Link a sketch" i
 [$1](file:///home/h/sketches/$2)
 endsnippet
 
+snippet fn "Filename"
+`!p snip.rv = snip.basename`
+endsnippet
+
 snippet ` "Inline code" i
 `$1`$2
 endsnippet