From 6de260026b4de51021b9a31969558955b3b95d62 Mon Sep 17 00:00:00 2001
From: Ekaitz Zarraga <ekaitz@elenq.tech>
Date: Tue, 13 Feb 2024 22:15:11 +0100
Subject: world: ui: make a minimally working example

- It doesn't have a cursor
- It's very slow
---
 world/ui.scm | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++---------
 world/ui.sld |  3 +++
 2 files changed, 61 insertions(+), 10 deletions(-)

diff --git a/world/ui.scm b/world/ui.scm
index 757e7dd..73bfcc8 100644
--- a/world/ui.scm
+++ b/world/ui.scm
@@ -1,18 +1,66 @@
+;; TODO make this the only platform specific thing
+;; Should remember the latest screen to be able to only reprint differences
+
+(define terminal-size #f)
+(define current-port #f)
+(define scroll 0)
+
+(define (scroll-down)
+  (set! scroll (+ 3 scroll)))
+(define (scroll-up)
+  (set! scroll (- scroll 3))
+  (when (> 0 scroll) (set! scroll 0)))
+
+(define (get-terminal-size)
+  (get-terminal-dimensions current-port))
+
+(define (control c)
+  (integer->char (bitwise-and #b00011111 (char->integer c))))
+
+
+(define (redisplay! table)
+  ; TODO: This is currently utter slow!
+  "I need to remove the arguments from it... Probably call-with-window later"
+  (erase-screen!)
+  (for-each
+    (lambda (line-number)
+      (let ((line (piece-table-line table (+ line-number scroll))))
+        (move-cursor! 0 line-number)
+        (cond
+          ((eof-object? line)
+           (write-char #\~))
+          ((string? line)
+           (write-string line)))))
+    (iota (car terminal-size))))
+
 (define (tui-loop)
-  (define table (make-piece-table "hola"))
-  (let loop ((char (read-char)))
-    (move-cursor! 0 0)
-    (cond
-      ((char=? #\q char) #f)
-      (else (piece-table-insert! table 4 "hola" 'normal)
-            (erase-screen!)
-            (write-string (piece-table->string table))
-            (loop (read-char))))))
+  (define table (make-piece-table "hola\nhola"))
+  (redisplay! table)
+  (call/cc
+    (lambda (exit)
+      (let loop ((char (read-char)))
+        (cond
+          ; TODO: Assign characters and combinations symbolic names and
+          ; pass that to the core?
+          ((char=? (control #\q) char) (exit))
+          ((char=? (control #\d) char) (scroll-down))
+          ((char=? (control #\u) char) (scroll-up))
+          (else (piece-table-insert! table
+                                     (piece-table-text-length table)
+                                     (string char)
+                                     'normal)))
+        (redisplay! table)
+        (loop (read-char))))))
 
 (define (call-with-tui thunk)
   (dynamic-wind
     tui-initialize!
-    (lambda () (with-raw-io (current-input-port) thunk))
+    (lambda ()
+      (call-with-input-file "/dev/tty"
+        (lambda (p)
+          (set! current-port p)
+          (set! terminal-size (get-terminal-size))
+          (with-raw-io p thunk))))
     tui-deinitialize!))
 
 (define (run arguments)
diff --git a/world/ui.sld b/world/ui.sld
index b59401e..e9d4e11 100644
--- a/world/ui.sld
+++ b/world/ui.sld
@@ -1,5 +1,8 @@
 (define-library (world ui)
   (import (scheme base)
+          (scheme file)
+          (srfi 1)
+          (srfi 151)
           (world tty-commands)
           (par piece-table)) ;; Remove the piece table from here later, and move to main
   (cond-expand
-- 
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