correct render cache handling & improve render dynamism

pollen/private/ts.rktd

@@ -1 +1 @@
-1552843398
+1553393594

pollen/render.rkt

@@ -90,29 +90,33 @@
   (unless output-path
     (raise-argument-error caller "valid output path" output-path))
   (define template-path (or maybe-template-path (get-template-for source-path output-path)))
+  (define render-cache-activated? (setup:render-cache-active source-path))
   (define render-needed?
     (cond
       [force?]
       [(not (file-exists? output-path)) 'file-missing]
       [(mod-date-missing-or-changed? source-path template-path) 'mod-key-missing-or-changed]
-      [(not (setup:render-cache-active source-path)) 'render-cache-deactivated]
+      [(not render-cache-activated?) 'render-cache-deactivated]
       [else #false]))
   (when render-needed?
     (define render-result
-      (let ([key (paths->key source-path template-path output-path)])
+      (let ([key (paths->key source-path template-path output-path)]
+            [render-thunk (λ () (render source-path template-path output-path))]) ; returns either string or bytes
+        (if render-cache-activated?
             (hash-ref! render-ram-cache
                        ;; within a session, this will prevent repeat players like "template.html.p"
                        ;; from hitting the file cache repeatedly
                        key
-                   (λ () 
                        (cache-ref! key
-                                 (λ () (render source-path template-path output-path))
+                                   render-thunk
                                    #:dest-path 'output
                                    #:notify-cache-use
                                    (λ (str)
                                      (message (format "from cache /~a"
-                                                    (find-relative-path (current-project-root) output-path))))))))) ; will either be string or bytes
-    (display-to-file render-result output-path
+                                                      (find-relative-path (current-project-root) output-path))))))
+            (render-thunk))))
+    (display-to-file render-result
+                     output-path
                      #:exists 'replace
                      #:mode (if (string? render-result) 'text 'binary))))
 
@@ -211,7 +215,10 @@
   (unless template-path
     (raise-argument-error 'render-markup-or-markdown-source "valid template path" template-path))
   (render-from-source-or-output-path template-path) ; because template might have its own preprocessor source
-  (parameterize ([current-output-port (current-error-port)])
+  (parameterize ([current-output-port (current-error-port)]
+                 [current-namespace (make-base-namespace)])
+    (define outer-ns (namespace-anchor->namespace render-module-ns))
+    (namespace-attach-module outer-ns 'pollen/setup) 
     (eval (with-syntax ([MODNAME (gensym)]
                         [SOURCE-PATH-STRING (->string source-path)]
                         [TEMPLATE-PATH-STRING (->string template-path)])