From 0bd73fc1b7524bf64d416f5d311e9775a8afb913 Mon Sep 17 00:00:00 2001
From: plugd <plugd@thelambdalab.xyz>
Date: Mon, 15 Nov 2021 14:12:16 +0100
Subject: [PATCH] First message printed!

---
 ez.el | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 88 insertions(+), 9 deletions(-)

diff --git a/ez.el b/ez.el
index 549b8f0..2fa15b7 100644
--- a/ez.el
+++ b/ez.el
@@ -500,7 +500,8 @@
     ((1op #x02) get_child ez-op-get-child)
     ((1op #x03) get_parent ez-op-get-parent)
     ((2op #x0A) test_attr ez-op-test-attr)
-    ((var #x03) put_prop ez-op-put-prop)))
+    ((var #x03) put_prop ez-op-put-prop)
+    ((0op #x02) print ez-op-print)))
 
 (defun ez-op-ret (operands &optional operand-types)
   (let ((retval (car operands)))
@@ -636,7 +637,12 @@
     (ez-set-obj-prop obj prop a)
     t))
 
-;; Main
+(defun ez-op-print (operands operand-types)
+  (ez-print (ez-get-zstring (ez-get-pc)))
+  t)
+
+
+;; Execution loop
 
 (defun ez-run (filename)
   (ez-load-file filename)
@@ -645,13 +651,86 @@
 
   (while (ez-execute-instr)))
 
-;; Scratch
-
-;; (ez-load-file "zork1.z3")
-;; (ez-parse-header)
-;; (setq ez-call-stack (list (ez-make-call-stack-frame ez-start-pc)))
-;; (while (ez-execute-instr))
 
-(ez-run "zork1.z3")
+;;; Buffer and I/O
+;;
+
+(defun ez-render-prompt ()
+  (with-current-buffer "*ez*"
+    (let ((update-point (= ez-input-marker (point)))
+          (update-window-points (mapcar (lambda (w)
+                                          (list (= (window-point w) ez-input-marker)
+                                                w))
+                                        (get-buffer-window-list nil nil t))))
+      (save-excursion
+        (set-marker-insertion-type ez-prompt-marker nil)
+        (set-marker-insertion-type ez-input-marker t)
+        (let ((inhibit-read-only t))
+          (delete-region ez-prompt-marker ez-input-marker)
+          (goto-char ez-prompt-marker)
+          (insert
+           ">"
+           (propertize " " ; Need this to be separate to mark it as rear-nonsticky
+                       'read-only t
+                       'rear-nonsticky t)))
+        (set-marker-insertion-type ez-input-marker nil))
+      (goto-char ez-input-marker))))
+
+(defvar ez-prompt-marker nil
+  "Marker for prompt position in buffer.")
+
+(defvar ez-input-marker nil
+  "Marker for prompt position in buffer.")
+
+(defun ez-setup-buffer ()
+  (with-current-buffer (get-buffer-create "*ez*")
+    (let ((inhibit-read-only t))
+      (delete-region (point-min) (point-max)))
+    (setq-local scroll-conservatively 1)
+    (if (markerp ez-prompt-marker)
+        (set-marker ez-prompt-marker (point-max))
+      (setq ez-prompt-marker (point-max-marker)))
+    (if (markerp ez-input-marker)
+        (set-marker ez-input-marker (point-max))
+      (setq ez-input-marker (point-max-marker)))
+    (goto-char (point-max))
+    (ez-render-prompt)))
+
+
+(defun ez-print (string)
+  (with-current-buffer "*ez*"
+    (save-excursion
+      (goto-char ez-prompt-marker)
+      (insert-before-markers string))))
+
+;; Mode
+
+(defvar ez-mode-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map (kbd "RET") 'ez-enter)
+    map))
+
+(define-derived-mode ez-mode text-mode "ez"
+  "Major mode for EZ.")
+
+(when (fboundp 'evil-set-initial-state)
+  (evil-set-initial-state 'ez-mode 'insert))
+
+(defun ez (zfile)
+  (interactive "fEnter name of z3 story file: ")
+  (if (get-buffer "*ez*")
+      (switch-to-buffer "*ez*")
+    (switch-to-buffer "*ez*")
+    (ez-mode)
+    (ez-setup-buffer)
+    (ez-run zfile))
+  "Started EZ.")
+
+(defun ez-debug ()
+  (interactive)
+  (switch-to-buffer "*ez*")
+  (ez-mode)
+  (ez-setup-buffer)
+  (ez-run "zork1.z3"))
 
 ;;; ez.el ends here
-- 
2.20.1