 
 : solution-path ( n -- str/f )
     number>euler "project-euler." prepend
-    vocab where dup [ first ] when ;
+    vocab where dup [ first <pathname> ] when ;
 
 PRIVATE>
 

: run-project-euler ( -- )
    problem-prompt dup problem-solved? [
        dup number>euler "project-euler." prepend run
        "Answer: " swap dup number? [ number>string ] when append print
        "Source: " swap solution-path append print
    ] [
        drop "That problem has not been solved yet..." print
    ] if ;

! Copyright (c) 2007, 2008 Aaron Schaefer, Samuel Tardieu.
! See http://factorcode.org/license.txt for BSD license.
USING: definitions io io.files kernel math math.parser project-euler.ave-time
    sequences vocabs vocabs.loader prettyprint
    project-euler.001 project-euler.002 project-euler.003 project-euler.004
    project-euler.005 project-euler.006 project-euler.007 project-euler.008
    project-euler.009 project-euler.010 project-euler.011 project-euler.012
