From bd3f0485950258b0ddf4f9a2dfaf96a2518ea264 Mon Sep 17 00:00:00 2001
From: w6vvn <vivienne@w6vvn.net>
Date: Fri, 5 Sep 2025 17:59:11 -0700
Subject: [PATCH] encapsulate client state in an object

---
 gem300.rkt | 128 +++--------------------------------------------------
 1 file changed, 5 insertions(+), 123 deletions(-)

diff --git a/gem300.rkt b/gem300.rkt
index 3bc571b..fa04c6e 100644
--- a/gem300.rkt
+++ b/gem300.rkt
@@ -1,126 +1,8 @@
 #lang racket
 
-(require (prefix-in net: "net.rkt")
-         (prefix-in gmi: "gmi.rkt"))
+(require (prefix-in client: "client.rkt"))
 
-(require net/url-string)
-
-;; global state variable which will be an input port containing the
-;; rendered out gemtext document as it shall be shown to the user
-(define document-buffer null)
-
-;; global state which will be the document structure, before rendering
-(define document null)
-
-;; global state for the url of the currently visited document
-(define current-url null)
-
-(define temporary-failures
-  '((40 . "temporary failure")
-    (41 . "server unavailable")
-    (42 . "CGI error")
-    (43 . "proxy error")
-    (44 . "slow down")))
-
-(define permanent-failures
-  '((50 . "permanent failure")
-    (51 . "not found")
-    (52 . "gone")
-    (53 . "proxy request refused")
-    (59 . "bad request")))
-
-(define (get url-str)
-  (define (iter url-str depth)
-    (let-values ([(status header c-in) (net:request url-str)])
-      ;; TODO there are bunch of other status codes to deal with for
-      ;; compliance
-      (cond
-        ;; clients MUST reject status codes outside of the 10-69 range
-        [(or (< status 10)
-             (> status 69))
-         (displayln "WARNING: server returned invalid status code")]
-
-        ;; 10-19 INPUT REQUIRED
-        [(and (>= status 10)
-              (<= status 19))
-         (display "input requested > ")
-         (get (string-append url-str "?" (read-line)))]
-
-        ;; 20-29 SUCCESS
-        [(and (>= status 20)
-              (<= status 29))
-
-         (let-values ([(doc) (gmi:parse (port->lines c-in))]
-                      [(db-in db-out) (make-pipe #f)])
-
-           (set! document doc)
-
-           (set! document-buffer db-in)
-           (parameterize ([current-output-port db-out])
-             (gmi:render doc))
-
-           (set! current-url url-str)
-
-           (let ([remaining (pipe-content-length db-in)])
-             (printf "document retrieved. ~a bytes\n" remaining))
-
-           (next-cmd))]
-
-        ;; 30-39 REDIRECT
-        [(and (>= status 30)
-              (<= status 39))
-         (if (> depth 5)
-             (displayln "WARNING: maximum redirection depth exceeded")
-             (iter header (sub1 depth)))]
-
-        ;; 40-49 TEMPORARY FAILURE
-        [(and (>= status 40)
-              (<= status 49))
-         (printf "status ~a: ~a\n" status
-                 (dict-ref temporary-failures status "temporary failure"))]
-
-        ;; 50-59 PERMANENT FAILURE
-        [(and (>= status 50)
-              (<= status 59))
-         (printf "status ~a: ~a\n" status
-                 (dict-ref permanent-failures status "permanent failure"))]
-
-        ;; 60-69 CERTIFICATE REQUIRED
-        [(and (>= status 60)
-              (<= status 69))
-         (displayln "certificate handling not yet implemented")])))
-
-    (iter url-str 5))
-
-(define (go-cmd url)
-  (if (non-empty-string? url)
-      (let ()
-        (when (not (string-contains? url "://"))
-          (set! url (string-append "gemini://" url)))
-
-        (get url))
-
-      (displayln "go where?")))
-
-(define (next-cmd)
-  (define (iter depth)
-    (when (and (> depth 0)
-               (> (pipe-content-length document-buffer) 0))
-      (let ()
-        (displayln (read-line document-buffer))
-        (iter (sub1 depth)))))
-
-  (iter 10)
-  (newline)
-  (let ([remaining (pipe-content-length document-buffer)])
-    (printf "~a bytes remaining\n" remaining)))
-
-(define (visit-cmd line)
-  (define url (gmi:match-link document (string->number line)))
-  (set! url
-        (url->string (combine-url/relative (string->url current-url)
-                                           url)))
-  (get url))
+(define client (new client:client%))
 
 (define (repl)
   (display "G-300 > ")
@@ -131,15 +13,15 @@
       [(or (not matches)
            (string=? (cadr matches) "next")
            (string=? (cadr matches) "n"))
-       (next-cmd)]
+       (send client next-cmd)]
 
       ;; go command
       [(or (string=? (cadr matches) "go")
            (string=? (cadr matches) "g"))
-       (go-cmd (caddr matches))]
+       (send client go-cmd (caddr matches))]
 
       ;; visit link command
       [(andmap char-numeric? (string->list (cadr matches)))
-       (visit-cmd (cadr matches))]))
+       (send client visit-cmd (cadr matches))]))
 
   (repl))