make sure `get-template-for` notices template sources

file.rkt

@@ -11,13 +11,16 @@
   dir)
 
 
-(define+provide/contract (find-upward-from source-path filename-to-find)
-  (coerce/path? coerce/path? . -> . (or/c #f path?))
-    (parameterize ([current-directory (dirname (->complete-path source-path))])
+(define+provide/contract (find-upward-from starting-path filename-to-find
+                                           [exists-proc file-exists?])
+  ;; use exists-proc to permit less strict matching.
+  ;; for instance, maybe it's ok to find the source for the path.
+  ((coerce/path? coerce/path?)((path? . -> . any/c)) . ->* . (or/c #f path?))
+    (parameterize ([current-directory (dirname (->complete-path starting-path))])
       (let loop ([dir (current-directory)][path filename-to-find])
         (and dir ; dir is #f when it hits the top of the filesystem
              (let ([completed-path (path->complete-path path)]) 
-               (if (file-exists? completed-path)
+               (if (exists-proc completed-path)
                    (simplify-path completed-path)
                    (loop (dirname dir) (build-path 'up path))))))))
 

render.rkt

@@ -230,7 +230,7 @@
     (define (get-default-template)
       (and output-path-ext
            (let ([default-template-filename (add-ext (world:current-default-template-prefix) output-path-ext)])
-             (find-upward-from source-path default-template-filename))))
+             (find-upward-from source-path default-template-filename file-exists-or-has-source?))))
     
     (define (get-fallback-template)
       (and output-path-ext

test/data/pathup/subdir/template.html.p

@@ -0,0 +1,3 @@
+#pollen
+
+42

test/test-pathup.rkt

@@ -1,11 +1,14 @@
 #lang at-exp racket/base
-(require rackunit racket/runtime-path pollen/project)
+(require rackunit racket/runtime-path pollen/project pollen/render)
 
 (define-runtime-path pathup-one "data/pathup/subdir/test-pathup-one.html.pm")
 (define-runtime-path dr-top "data/pathup/pollen.rkt")
 (define-runtime-path pathup-two "data/pathup/subdir/subdir/test-pathup-two.html.pm")
 (define-runtime-path dr-sub "data/pathup/subdir/subdir/pollen.rkt")
+(define-runtime-path template "data/pathup/subdir/template.html")
 
 (check-false (get-directory-require-files "test-pathup.rkt"))
 (check-equal? (get-directory-require-files pathup-one) (list dr-top))
-(check-equal? (get-directory-require-files pathup-two) (list dr-sub))
+(check-equal? (get-directory-require-files pathup-two) (list dr-sub))
+(check-equal? (get-template-for pathup-one) template)
+(check-equal? (get-template-for pathup-two) template)