improve internal logic of `select`

template.rkt

@@ -17,10 +17,18 @@
 
 (define+provide/contract (select key value-source)
   (coerce/symbol? (or/c hash? txexpr? pagenode? pathish?) . -> . (or/c #f txexpr-element?))
-  (define metas-result (and (not (txexpr? value-source)) (select-from-metas key value-source)))
+  ;; of value-source is specfically 'metas or 'doc,
-  (or metas-result
+  ;; restrict the search to there.
-      (let ([doc-result (select-from-doc key value-source)])
+  ;; otherwise look in metas, then in doc for key
-        (and doc-result (car doc-result)))))
+  (define (do-doc-result)
+    (define doc-result (select-from-doc key value-source))
+     (and doc-result (car doc-result)))  
+  (cond
+    [(or (hash? value-source) (equal? value-source world:meta-pollen-export)) (select-from-metas key value-source)]
+    [(equal? value-source world:main-pollen-export) (do-doc-result)]
+    [else
+     (define metas-result (and (not (txexpr? value-source)) (select-from-metas key value-source)))
+     (or metas-result (do-doc-result))]))
 
 
 (define+provide/contract (select* key value-source)
@@ -77,7 +85,7 @@
   ((xexpr?) (#:tag (or/c #f txexpr-tag?) #:attrs (or/c #f txexpr-attrs?) #:splice boolean?) . ->* . string?)
   
   (when (and (not (txexpr? x)) attrs (not tag))
-      (error '->html "can't use attribute list '~a without a #:tag argument" attrs))
+    (error '->html "can't use attribute list '~a without a #:tag argument" attrs))
   
   (if (or tag (txexpr? x))
       (let ()

tests/test-template.rkt

@@ -19,3 +19,24 @@
 (check-equal? (->html #:splice #t x) "hello")
 (check-equal? (->html #:tag 'brennan #:attrs '((id "dale")) x) "<brennan id=\"dale\">hello</brennan>")
 (check-equal? (->html #:tag 'brennan #:attrs '((id "dale")) #:splice #t x) "hello")
+
+
+(check-equal? (select 'key  '#hash((key . "value"))) "value")
+(check-false (select 'absent-key  '#hash((key . "value"))))
+
+(let ([metas '#hash((key . "value"))])
+  (check-equal? (select 'key  metas) "value")
+  (check-false (select 'absent-key  metas))
+  (check-equal? (select-from-metas 'key  metas) "value")
+  (check-false (select-from-metas 'absent-key  metas)))
+
+(check-equal? (select 'key  '(root (key "value"))) "value")
+(check-false (select 'absent-key  '(root (key "value"))))
+(check-equal? (select-from-doc 'key  '(root (key "value"))) '("value"))
+(check-false (select-from-doc 'absent-key  '(root (key "value"))))
+
+(let ([doc '(root (key "value"))])
+  (check-equal? (select 'key  doc) "value")
+  (check-false (select 'absent-key  doc))
+  (check-equal? (select-from-doc 'key  doc) '("value"))
+  (check-false (select-from-doc 'absent-key  doc)))