Add a pokemon example to the front page

src/page-home.rkt

@@ -15,6 +15,7 @@
 
 (define examples
   '(("crosscode" "CrossCode_Wiki")
+    ("pokemon" "Eevee")
     ("minecraft" "Bricks")
     ("undertale" "Hot_Dog...%3F")
     ("tardis" "Eleanor_Blake")

src/page-wiki.rkt

@@ -13,6 +13,7 @@
          web-server/http
          web-server/dispatchers/dispatch
          ; my libs
+         "config.rkt"
          "pure-utils.rkt"
          "xexpr-utils.rkt"
          "url-utils.rkt"
@@ -231,12 +232,17 @@
             (define body
               (generate-wiki-page source-url wikiname title (update-tree-wiki page wikiname)))
             (define redirect-msg ((query-selector (attribute-selector 'class "redirectMsg") body)))
-            (response/output
+            (define headers (if redirect-msg
-             #:code 200
-             #:headers (if redirect-msg
                                 (let* ([dest (get-attribute 'href (bits->attributes ((query-selector (λ (t a c) (eq? t 'a)) redirect-msg))))]
                                        [value (bytes-append #"0;url=" (string->bytes/utf-8 dest))])
                                   (list (header #"Refresh" value)))
-                           (list))
+                                (list)))
+            (when (config-true? 'debug)
+              ; used for its side effects
+              ; convert to string with error checking, error will be raised if xexp is invalid
+              (xexp->html body))
+            (response/output
+             #:code 200
+             #:headers headers
              (λ (out)
                (write-html body out))))))]))

src/xexpr-utils.rkt

@@ -158,7 +158,8 @@
     (define attributes (bits->attributes (cdr element)))
     (define contents (filter element-is-content? (cdr element))) ; provide elements and strings
     (if (or (equal? element-type '*DECL)
-            (equal? element-type '@))
+            (equal? element-type '@)
+            (equal? element-type '&))
         ; special element, do nothing
         element
         ; regular element, transform it
@@ -169,6 +170,10 @@
                    (map (λ (content)
                           (if (element-is-element? content) (loop content) content))
                         contents))]))))
+(module+ test
+  ; check (& x) sequences are preserved
+  (check-equal? (update-tree (λ (e t a c) (list t a c)) '(body "Hey" (& nbsp) (a (@ (href "/")))))
+                '(body "Hey" (& nbsp) (a (@ (href "/"))))))
 
 (define (has-class? name attributes)
   (and (member name (string-split (or (get-attribute 'class attributes) "") " ")) #t))