From a8753ebe5492cf0bc66e7b18e128c7d87936f551 Mon Sep 17 00:00:00 2001
From: Tim Vaughan <plugd@thelambdalab.xyz>
Date: Tue, 15 Jun 2021 22:47:49 +0200
Subject: [PATCH] Read-only behaviour is now correct.

---
 lirc.el | 103 ++++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 85 insertions(+), 18 deletions(-)

diff --git a/lirc.el b/lirc.el
index db78af8..ee6bdd4 100644
--- a/lirc.el
+++ b/lirc.el
@@ -48,12 +48,16 @@
 (defcustom lirc-port 6667
   "Default port.")
 
-(defcustom lirc-prompt "> "
+(defcustom lirc-prompt-string "prompt> "
   "Prompt.")
 
 ;;; Faces
 ;;
 
+(defface lirc-prompt
+  '((t :inherit font-lock-string-face))
+  "Face used for the prompt.")
+
 ;;; Global variables
 ;;
 
@@ -62,10 +66,14 @@
 
 (defvar lirc-response "")
 
+
+;;; Network process
+;;
+
 (defun lirc-filter (proc string)
   (dolist (line (split-string (concat lirc-response string) "\n"))
     (if (string-suffix-p "\r" line)
-        (lirc-process-msg-string (string-trim line))
+        (lirc-eval-msg-string (string-trim line))
       (setq lirc-response line))))
 
 (defun lirc-get-process ()
@@ -79,6 +87,9 @@
                             :nowait t
                             :buffer "*lirc*"))))
 
+;;; Messages
+;;
+
 (defun lirc-as-string (obj)
   (if obj
       (with-output-to-string (princ obj))
@@ -147,14 +158,61 @@
          (concat ":" (elt params (- (length params) 1)))
        nil))))
 
+
+;;; Buffer
+;;
+
 (defun lirc-display-string (string)
+  (with-current-buffer (get-buffer-create "*lirc*")
+    (save-excursion
+      (goto-char lirc-prompt-marker)
+      (let ((inhibit-read-only t))
+        (insert-before-markers (propertize (concat string "\n") 'read-only t))))))
+
+(defun lirc-connect ()
+  (lirc-send-msg (lirc-msg nil nil "USER" lirc-user-name 0 "*" lirc-full-name))
+  (lirc-send-msg (lirc-msg nil nil "NICK" lirc-nick)))
+
+(defun lirc-send-msg (msg)
+  (let ((proc (lirc-get-process)))
+    (process-send-string proc (concat (lirc-msg->string msg) "\r\n"))))
+
+(defun lirc-render-prompt ()
   (with-current-buffer "*lirc*"
+    (set-marker-insertion-type lirc-prompt-marker nil)
+    (set-marker-insertion-type lirc-input-marker t)
     (let ((inhibit-read-only t))
-      (save-excursion
-        (goto-char (point-max))
-        (insert (propertize (concat string "\n") 'read-only t))))))
+      (delete-region lirc-prompt-marker lirc-input-marker))
+    (save-excursion
+      (goto-char lirc-prompt-marker)
+      (let ((inhibit-read-only t))
+        (insert (propertize lirc-prompt-string
+                            'face 'lirc-prompt
+                            'read-only t
+                            'rear-nonsticky t))))))
+  
+(defvar lirc-prompt-marker nil
+  "Marker for prompt position in LIRC buffer.")
+
+(defvar lirc-input-marker nil
+  "Marker for prompt position in LIRC buffer.")
+
+(defun lirc-setup-buffer ()
+  (with-current-buffer (get-buffer-create "*lirc*")
+    (if (markerp lirc-prompt-marker)
+        (set-marker lirc-prompt-marker (point-max))
+      (setq lirc-prompt-marker (point-max-marker)))
+    (if (markerp lirc-input-marker)
+        (set-marker lirc-input-marker (point-max))
+      (setq lirc-input-marker (point-max-marker)))
+    (lirc-render-prompt)
+    (goto-char (point-max))
+    (recenter -1)))
+
+;;; Message evaluation
+;;
 
-(defun lirc-process-msg-string (string)
+(defun lirc-eval-msg-string (string)
   (let* ((msg (lirc-string->msg string)))
     (cond
      ((equal (lirc-msg-cmd msg) "PING")
@@ -165,25 +223,34 @@
      (t
       (lirc-display-string (lirc-msg->string msg))))))
 
-(defun lirc-connect ()
-  (lirc-send-msg (lirc-msg nil nil "USER" lirc-user-name 0 "*" lirc-full-name))
-  (lirc-send-msg (lirc-msg nil nil "NICK" lirc-nick)))
 
-(defun lirc-send-msg (msg)
-  (let ((proc (lirc-get-process)))
-    (process-send-string proc (concat (lirc-msg->string msg) "\r\n"))))
-  
+;;; Mode
+;;
+
+(defvar lirc-mode-map
+  (let ((map (make-sparse-keymap)))
+    map))
+
+(define-derived-mode lirc-mode text-mode "lirc"
+  "Major mode for LIRC.")
+
+(when (fboundp 'evil-set-initial-state)
+  (evil-set-initial-state 'lirc-mode 'insert))
+
+;;; Main start procedure
+;;
 
 (defun lirc ()
   "Switch to *lirc* buffer."
   (interactive)
-  (pop-to-buffer-same-window "*lirc*")
+  (if (get-buffer "*lirc*")
+      (switch-to-buffer "*lirc*")
+    (switch-to-buffer "*lirc*"))
   (lirc-mode)
-  (lirc-connect))
+  (lirc-setup-buffer)
+  (lirc-connect)
+  "Started LIRC.")
 
-(define-derived-mode lirc-mode text-mode "lirc"
-  "Major mode for LIRC.")
 
 
 ;;; lirc.el ends here
-:bs-mbpr348.d.ethz.ch
-- 
2.20.1