use template source for hash key, not template output

cache.rkt

@@ -72,7 +72,8 @@
 (define (paths->key source-path [template-path #f])
   ;; key is list of file + mod-time pairs, use #f for missing
   (define path-strings (append (list source-path)
-                               (append (list template-path) ; is either path or #f
+                               (append (list (and template-path (or (->source-path template-path) template-path))) ; if source-path exists, use that instead
+
                                        (->list (get-directory-require-files source-path))))) ; is either list of files or (list #f)
   ;; can't use relative paths for cache keys because source files include `here-path` which is absolute.
   ;; problem is that cache could appear valid on another filesystem (based on relative pathnames & mod dates)

file.rkt

@@ -142,9 +142,18 @@
                (values (->complete-path (or (get-stem-source path) (->stem-source-path path)))
                        (->complete-path (->output-path path)))))))]))
 
-
 (make-source-utility-functions preproc)
 
+(define+provide/contract (->source+output-paths source-or-output-path)
+  (complete-path? . -> . (values complete-path? complete-path?))
+  ;; file-proc returns two values, but ormap only wants one
+  (define file-proc (ormap (λ(test file-proc) (and (test source-or-output-path) file-proc))
+                           (list has/is-null-source? has/is-preproc-source? has/is-markup-source? has/is-scribble-source? has/is-markdown-source? has/is-template-source?)
+                           (list ->null-source+output-paths ->preproc-source+output-paths ->markup-source+output-paths ->scribble-source+output-paths ->markdown-source+output-paths ->template-source+output-paths)))
+  (file-proc source-or-output-path))
+
+
+
 (module-test-external
  (require sugar/coerce)
  (check-true (preproc-source? "foo.pp"))
@@ -242,7 +251,7 @@
 (define+provide (cache-file? path)
   (ormap (λ(cache-name) (ends-with? (path->string path) cache-name)) world:cache-names))
 
-(require sugar/debug)
+
 (define+provide (pollen-related-file? file)
   (ormap (λ(proc) (proc file)) (list
                                 preproc-source? 

render.rkt

@@ -90,15 +90,6 @@
   (void))
 
 
-(define/contract (->source+output-paths source-or-output-path)
-  (complete-path? . -> . (values complete-path? complete-path?))
-  ;; file-proc returns two values, but ormap only wants one
-  (define file-proc (ormap (λ(test file-proc) (and (test source-or-output-path) file-proc))
-                           (list has/is-null-source? has/is-preproc-source? has/is-markup-source? has/is-scribble-source? has/is-markdown-source? has/is-template-source?)
-                           (list ->null-source+output-paths ->preproc-source+output-paths ->markup-source+output-paths ->scribble-source+output-paths ->markdown-source+output-paths ->template-source+output-paths)))
-  (file-proc source-or-output-path))
-
-
 (define/contract (render-needed? source-path template-path output-path)
   (complete-path? (or/c #f complete-path?) complete-path? . -> . (or/c #f symbol?))
   ;; return symbol rather than boolean for extra debugging information