dream: chat (ws rooms) + todo (forms+CSRF) demos + 17 tests

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/dream/demos/chat.sx

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+;; lib/dream/demos/chat.sx — multi-room WebSocket chat (chat.ml).
+;; A room registry holds the live connections per room; each ws session joins its
+;; room, broadcasts every received message to the room, and leaves on close.
+
+(define dream-chat-rooms (fn () (let ((rooms {})) {:join (fn (room ws) (set! rooms (assoc rooms room (concat (or (get rooms room) (list)) (list ws))))) :broadcast (fn (room msg) (for-each (fn (w) (dream-send w msg)) (or (get rooms room) (list)))) :members (fn (room) (or (get rooms room) (list))) :leave (fn (room ws) (set! rooms (assoc rooms room (filter (fn (w) (not (= w ws))) (or (get rooms room) (list))))))})))
+
+(define
+  dream-chat-loop
+  (fn
+    (rooms room ws)
+    (let
+      ((m (dream-receive ws)))
+      (if
+        (nil? m)
+        (begin ((get rooms :leave) room ws) (dream-close ws))
+        (begin
+          ((get rooms :broadcast) room m)
+          (dream-chat-loop rooms room ws))))))
+
+(define
+  dream-chat-session
+  (fn
+    (rooms room)
+    (fn
+      (ws)
+      (begin ((get rooms :join) room ws) (dream-chat-loop rooms room ws)))))
+
+(define
+  dream-chat-route
+  (fn
+    (rooms)
+    (fn
+      (req)
+      ((dream-websocket (dream-chat-session rooms (dream-param req "room")))
+        req))))
+
+(define
+  dream-chat-app-with
+  (fn
+    (rooms)
+    (dream-router
+      (list
+        (dream-get "/" (fn (req) (dream-html "<h1>Rooms</h1>")))
+        (dream-get "/chat/:room" (dream-chat-route rooms))))))
+
+;; entry point: (dream-run (dream-chat-app-with (dream-chat-rooms)))

lib/dream/demos/todo.sx

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+;; lib/dream/demos/todo.sx — CRUD todo list with forms + CSRF (todo.ml).
+;; An in-memory store holds items; add/toggle/delete go through POST forms guarded
+;; by the CSRF middleware. Wires session -> csrf -> router.
+
+(define
+  dream-todo-store
+  (fn () (let ((items (list)) (next-id 0)) {:all (fn () items) :add (fn (text) (begin (set! next-id (+ next-id 1)) (set! items (concat items (list {:id next-id :text text :done false}))) next-id)) :delete (fn (id) (set! items (filter (fn (it) (not (= (get it :id) id))) items))) :toggle (fn (id) (set! items (map (fn (it) (if (= (get it :id) id) (assoc it :done (not (get it :done))) it)) items)))})))
+
+(define
+  dr/todo-render
+  (fn
+    (store req)
+    (str
+      "<ul>"
+      (reduce
+        (fn
+          (acc it)
+          (str
+            acc
+            "<li>"
+            (if (get it :done) "[x] " "[ ] ")
+            (get it :text)
+            "</li>"))
+        ""
+        ((get store :all)))
+      "</ul>"
+      "<form method=\"post\" action=\"/add\">"
+      (dream-csrf-tag req)
+      "<input name=\"text\"><button>Add</button></form>")))
+
+(define
+  dream-todo-index
+  (fn (store) (fn (req) (dream-html (dr/todo-render store req)))))
+
+(define
+  dream-todo-add
+  (fn
+    (store)
+    (fn
+      (req)
+      (let
+        ((r (dream-form req)))
+        (if
+          (dream-ok? r)
+          (begin
+            ((get store :add) (get (dream-ok-value r) "text"))
+            (dream-redirect "/"))
+          (dream-html-status
+            403
+            (str "Rejected: " (dream-err-reason r))))))))
+
+(define
+  dream-todo-toggle
+  (fn
+    (store)
+    (fn
+      (req)
+      (let
+        ((r (dream-form req)))
+        (if
+          (dream-ok? r)
+          (begin
+            ((get store :toggle) (parse-int (dream-param req "id")))
+            (dream-redirect "/"))
+          (dream-html-status 403 "Rejected"))))))
+
+(define
+  dream-todo-delete
+  (fn
+    (store)
+    (fn
+      (req)
+      (let
+        ((r (dream-form req)))
+        (if
+          (dream-ok? r)
+          (begin
+            ((get store :delete) (parse-int (dream-param req "id")))
+            (dream-redirect "/"))
+          (dream-html-status 403 "Rejected"))))))
+
+(define
+  dream-todo-app-with
+  (fn
+    (store backend secret)
+    ((dream-sessions backend)
+      ((dream-csrf secret)
+        (dream-router
+          (list
+            (dream-get "/" (dream-todo-index store))
+            (dream-post "/add" (dream-todo-add store))
+            (dream-post "/toggle/:id" (dream-todo-toggle store))
+            (dream-post "/delete/:id" (dream-todo-delete store))))))))
+
+;; entry: (dream-run (dream-todo-app-with (dream-todo-store) (dream-memory-sessions) "change-me"))