hook for external renderer

pollen/private/ts.rktd

@@ -1 +1 @@
-1615671175
+1616607395

pollen/render.rkt

@@ -259,7 +259,7 @@
       [(not render-cache-activated?) 'render-cache-deactivated]
       [else #false]))
   (when render-needed?
-    (define render-thunk (or maybe-render-thunk (λ () (render source-path template-path output-path)))) ; returns either string or bytes
+    (define render-thunk (or maybe-render-thunk (λ () ((or (setup:external-renderer) render) source-path template-path output-path)))) ; returns either string or bytes
     (define render-result
       (cond
         [render-cache-activated?

pollen/setup.rkt

@@ -134,3 +134,5 @@
 (define-settable index-pages '("index.html"))
 
 (define-settable allow-unbound-ids? #true)
+
+(define-settable external-renderer #false)