From 6c4686b0d2dd90142811ff7e1d2aa1898ecbd146 Mon Sep 17 00:00:00 2001
From: plugd <plugd@thelambdalab.xyz>
Date: Tue, 13 Jul 2021 13:33:42 +0200
Subject: [PATCH] Added user-defined responses.

---
 lurk.el | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 57 insertions(+), 2 deletions(-)

diff --git a/lurk.el b/lurk.el
index 05e7da3..72d18cf 100644
--- a/lurk.el
+++ b/lurk.el
@@ -611,6 +611,7 @@ portion of the source component of the message, as LURK doesn't use this.")
   (if lurk-debug
       (lurk-display-string nil nil string))
   (let* ((msg (lurk-string->msg string)))
+    (lurk-process-autoreplies msg)
     (pcase (lurk-msg-cmd msg)
       ("PING"
        (lurk-send-msg
@@ -763,14 +764,68 @@ portion of the source component of the message, as LURK doesn't use this.")
        (lurk-display-notice nil (lurk-msg->string msg))))))
 
 
+;;; User-defined responses
+
+
+(defvar lurk-autoreply-table nil
+  "Table of autoreply messages.
+
+Each autoreply is a list of two elements: (matcher reply)
+
+Here matcher is a list:
+
+(network src cmd params ...)
+
+and reply is another list:
+
+ (cmd params ...)
+
+Each entry in the matcher list is a regular expression tested against the
+corresponding values in the incomming message.  Entries can be nil,
+in which case they match anything.")
+
+(defun lurk--lists-equal (l1 l2)
+    (if (and l1 l2)
+        (if (or (not (and (car l1) (car l2)))
+                (string-match (car l1) (car l2)))
+            (lurk--lists-equal (cdr l1) (cdr l2))
+          nil)
+      t))
+
+(defun lurk-process-autoreply (msg autoreply)
+  (let ((matcher (car autoreply))
+        (reply (cadr autoreply)))
+    (let ((network (car matcher)))
+      (when (and (or (not network)
+                     (and (get-process "lurk")
+                          (equal (car (process-contact (get-process "lurk")))
+                                 (cadr (assoc network lurk-networks)))))
+                 (lurk--lists-equal (cdr matcher)
+                                    (append (list (lurk-msg-src msg)
+                                                  (lurk-msg-cmd msg))
+                                            (lurk-msg-params msg))))
+        (lurk-send-msg
+         (lurk-msg nil nil (car reply) (cdr reply)))))))
+
+(defun lurk-process-autoreplies (msg)
+  (mapc
+   (lambda (autoreply)
+     (lurk-process-autoreply msg autoreply))
+   lurk-autoreply-table))
+
 ;;; Command entering
 ;;
 
 (defun lurk-enter-string (string)
   (if (string-prefix-p "/" string)
       (pcase (substring string 1)
-        ((rx "DEBUG")
-         (setq lurk-debug (not lurk-debug))
+        ((rx (: "DEBUG" (opt (: " " (let setting (or "ON" "OFF"))))))
+         (setq lurk-debug
+               (if setting
+                   (if (equal (upcase setting) "ON")
+                       t
+                     nil)
+                 (not lurk-debug)))
          (lurk-display-notice nil "Debug mode now " (if lurk-debug "on" "off") "."))
 
         ((rx "HEADER")
-- 
2.20.1