From 64994dc2c5c36a9cdb125e6bd0ddc497e077fa25 Mon Sep 17 00:00:00 2001
From: plugd <plugd@thelambdalab.xyz>
Date: Sat, 18 May 2024 17:03:12 +0200
Subject: [PATCH] Ported over more lurk code.

---
 murk.el | 291 ++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 283 insertions(+), 8 deletions(-)

diff --git a/murk.el b/murk.el
index af7fd0e..1cab898 100644
--- a/murk.el
+++ b/murk.el
@@ -6,7 +6,7 @@
 ;; Created: 11 May 2024
 ;; Version: 0.0
 ;; Keywords: network
-;; Homepage: http://thelambdalab.xyz/metalurk
+;; Homepage: http://thelambdalab.xyz/murk
 ;; Package-Requires: ((emacs "26"))
 
 ;; This file is not part of GNU Emacs.
@@ -48,6 +48,9 @@
     ("tilde" "tilde.chat" 6697))
   "IRC networks.")
 
+(defcustom murk-display-header t
+  "If non-nil, use buffer header to display information on current host and channel.")
+
 
 ;;; Faces
 ;;
@@ -127,7 +130,7 @@ This includes the process and the response string.")
                                                   (gnutls-boot-parameters
                                                    :type 'gnutls-x509pki
                                                    :hostname host)))
-                          :buffer "*lurk*")))
+                          :buffer "*murk*")))
 
 (defvar murk-ping-period 60)
 
@@ -141,8 +144,85 @@ This includes the process and the response string.")
       (let ((proc (murk-start-process server)))
         (add-to-list murk-connection-table
                      (list server proc "")))
-      (murk-send-msg (murk-msg nil nil "USER" murk-nick 0 "*" murk-nick))
-      (murk-send-msg (murk-msg nil nil "NICK" murk-nick)))))
+      (murk-send-msg server (murk-msg nil nil "USER" murk-nick 0 "*" murk-nick))
+      (murk-send-msg server (murk-msg nil nil "NICK" murk-nick)))))
+
+(defun murk-send-msg (server msg)
+  (if murk-debug
+      (murk-display-string nil nil (murk-msg->string msg)))
+  (let ((proc (murk-connection-process server)))
+    (if (and proc (eq (process-status proc) 'open))
+        (process-send-string proc (concat (murk-msg->string msg) "\r\n"))
+      (murk-display-error "No server connection established.")
+      (error "No server connection established"))))
+
+;;; Server messages
+;;
+
+(defun murk-msg (tags src cmd &rest params)
+  (list (murk--as-string tags)
+        (murk--as-string src)
+        (upcase (murk--as-string cmd))
+        (mapcar #'murk--as-string
+                (if (and params (listp (elt params 0)))
+                    (elt params 0)
+                  params))))
+
+(defun murk-msg-tags (msg) (elt msg 0))
+(defun murk-msg-src (msg) (elt msg 1))
+(defun murk-msg-cmd (msg) (elt msg 2))
+(defun murk-msg-params (msg) (elt msg 3))
+(defun murk-msg-trail (msg)
+  (let ((params (murk-msg-params msg)))
+    (if params
+        (elt params (- (length params) 1)))))
+
+(defvar murk-msg-regex
+  (rx
+   (opt (: "@" (group (* (not (or "\n" "\r" ";" " ")))))
+        (* whitespace))
+   (opt (: ":" (: (group (* (not (any space "!" "@"))))
+                  (* (not (any space)))))
+        (* whitespace))
+   (group (: (* (not whitespace))))
+   (* whitespace)
+   (opt (group (+ not-newline))))
+  "Regex used to parse IRC messages.
+Note that this regex is incomplete.  Noteably, we discard the non-nick
+portion of the source component of the message, as mURK doesn't use this.")
+
+(defun murk-string->msg (string)
+  (if (string-match murk-msg-regex string)
+      (let* ((tags (match-string 1 string))
+             (src (match-string 2 string))
+             (cmd (upcase (match-string 3 string)))
+             (params-str (match-string 4 string))
+             (params
+              (if params-str
+                  (let* ((idx (cl-search ":" params-str))
+                         (l (split-string (string-trim (substring params-str 0 idx))))
+                         (r (if idx (list (substring params-str (+ 1 idx))) nil)))
+                    (append l r))
+                nil)))
+        (apply #'murk-msg (append (list tags src cmd) params)))
+    (error "Failed to parse string " string)))
+
+(defun murk-msg->string (msg)
+  (let ((tags (murk-msg-tags msg))
+        (src (murk-msg-src msg))
+        (cmd (murk-msg-cmd msg))
+        (params (murk-msg-params msg)))
+    (murk--filtered-join
+     (if tags (concat "@" tags) nil)
+     (if src (concat ":" src) nil)
+     cmd
+     (if (> (length params) 1)
+         (string-join (seq-take params (- (length params) 1)) " ")
+       nil)
+     (if (> (length params) 0)
+         (concat ":" (elt params (- (length params) 1)))
+       nil))))
+
 
 ;;; Contexts and Servers
 ;;
@@ -154,12 +234,207 @@ This includes the process and the response string.")
 ;; Each server has a special context (server) used for messages
 ;; to/from the server itself.
 
-(defvar murk-current-context nil)
-(defvar murk-context-members nil)
+(defvar murk-contexts nil
+  "List of currently-available contexts.
+The head of this list is always the current context.")
+
+(defun murk-current-context ()
+  "Returns the current context."
+  (if murk-contexts
+      (car murk-contexts)
+    nil))
+
+(defun murk-context-server (ctx) (elt ctx 0))
+(defun murk-context-name (ctx) (elt ctx 1))
+
+;;; Buffer
+;;
+
+(defun murk-render-prompt ()
+  (with-current-buffer "*murk*"
+    (let ((update-point (= murk-input-marker (point)))
+          (update-window-points (mapcar (lambda (w)
+                                          (list (= (window-point w) murk-input-marker)
+                                                w))
+                                        (get-buffer-window-list nil nil t))))
+      (save-excursion
+        (set-marker-insertion-type murk-prompt-marker nil)
+        (set-marker-insertion-type murk-input-marker t)
+        (let ((inhibit-read-only t))
+          (delete-region murk-prompt-marker murk-input-marker)
+          (goto-char murk-prompt-marker)
+          (insert
+           (propertize (let ((ctx (murk-current-context)))
+                         (if ctx
+                           (concat (murk-context-name) "@" (murk-context-server ctx))
+                         ""))
+                       'face 'murk-context
+                       'read-only t)
+           (propertize murk-prompt-string
+                       'face 'murk-prompt
+                       'read-only t)
+           (propertize " " ; Need this to be separate to mark it as rear-nonsticky
+                       'read-only t
+                       'rear-nonsticky t)))
+        (set-marker-insertion-type murk-input-marker nil))
+      (if update-point
+          (goto-char murk-input-marker))
+      (dolist (v update-window-points)
+        (if (car v)
+            (set-window-point (cadr v) murk-input-marker))))))
+  
+(defvar murk-prompt-marker nil
+  "Marker for prompt position in murk buffer.")
+
+(defvar murk-input-marker nil
+  "Marker for prompt position in murk buffer.")
+
+(defun murk-setup-header ()
+  ;; To do
+  )
+
+(defun murk-setup-buffer ()
+  (with-current-buffer (get-buffer-create "*murk*")
+    (setq-local scroll-conservatively 1)
+    (setq-local buffer-invisibility-spec nil)
+    (if (markerp murk-prompt-marker)
+        (set-marker murk-prompt-marker (point-max))
+      (setq murk-prompt-marker (point-max-marker)))
+    (if (markerp murk-input-marker)
+        (set-marker murk-input-marker (point-max))
+      (setq murk-input-marker (point-max-marker)))
+    (goto-char (point-max))
+    (murk-render-prompt)
+    (if murk-display-header
+        (murk-setup-header))))
+
+(defun murk-clear-buffer ()
+  "Completely erase all non-prompt and non-input text from murk buffer."
+  (with-current-buffer "*murk*"
+    (let ((inhibit-read-only t))
+      (delete-region (point-min) murk-prompt-marker))))
+
+
+;;; Output formatting and highlighting
+;;
+
+(defun murk--fill-strings (col indent &rest strings)
+  (with-temp-buffer
+    (setq buffer-invisibility-spec nil)
+    (let ((fill-column col)
+          (adaptive-fill-regexp (rx-to-string `(= ,indent anychar))))
+      (apply #'insert strings)
+      (fill-region (point-min) (point-max) nil t)
+      (buffer-string))))
+
+(defun murk-context->string (context)
+  (if context
+      (concat (murk-context-name) "@" (murk-context-server context))
+    nil))
+
+
+(defun murk-display-string (context prefix &rest strings)
+  (with-current-buffer "*murk*"
+    (save-excursion
+      (goto-char murk-prompt-marker)
+      (let* ((inhibit-read-only t)
+             (old-pos (marker-position murk-prompt-marker))
+             (padded-timestamp (concat (format-time-string "%H:%M ")))
+             (padded-prefix (if prefix (concat prefix " ") ""))
+             (context-atom (if context (intern (murk-context->string context)) nil)))
+        (insert-before-markers
+         (murk--fill-strings
+          80
+          (+ (length padded-timestamp)
+             (length padded-prefix))
+          (propertize padded-timestamp
+                      'face 'murk-timestamp
+                      'read-only t
+                      'context context
+                      'invisible context-atom)
+          (propertize padded-prefix
+                      'read-only t
+                      'context context
+                      'invisible context-atom)
+          (concat (apply #'murk-buttonify-urls strings) "\n"))))))
+  (murk-scroll-windows-to-last-line))
+
+(defun murk--start-of-final-line ()
+  (with-current-buffer "*murk*"
+    (save-excursion
+      (goto-char (point-max))
+      (line-beginning-position))))
+
+(defun murk-scroll-windows-to-last-line ()
+  (with-current-buffer "*murk*"
+    (dolist (window (get-buffer-window-list))
+      (if (>= (window-point window) (murk--start-of-final-line))
+          (with-selected-window window
+            (recenter -1))))))
+
+(defconst murk-url-regex
+  (rx (:
+       (group (+ alpha))
+       "://"
+       (group (or (+ (any alnum "." "-"))
+                  (+ (any alnum ":"))))
+       (opt (group (: ":" (+ digit))))
+       (opt (group (: "/"
+                      (opt
+                       (* (any alnum "-/.,#:%=&_?~@+"))
+                       (any alnum "-/#:%=&_~@+")))))))
+  "Imperfect regex used to find URLs in plain text.")
+
+(defun murk-click-url (button)
+  (browse-url (button-get button 'url)))
+
+(defun murk-buttonify-urls (&rest strings)
+  "Turn substrings which look like urls in STRING into clickable buttons."
+  (with-temp-buffer
+    (apply #'insert strings)
+    (goto-char (point-min))
+    (while (re-search-forward murk-url-regex nil t)
+      (let ((url (match-string 0)))
+        (make-text-button (match-beginning 0)
+                          (match-end 0)
+                          'action #'murk-click-url
+                          'url url
+                          'follow-link t
+                          'face 'button
+                          'help-echo "Open URL in browser.")))
+    (buffer-string)))
+
+
+;;; Mode
+;;
+
+(defvar murk-mode-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map (kbd "RET") 'murk-enter)
+    (define-key map (kbd "TAB") 'murk-complete-input)
+    (when (fboundp 'evil-define-key*)
+      (evil-define-key* 'motion map
+        (kbd "TAB") 'murk-complete-input))
+    map))
+
+(define-derived-mode murk-mode text-mode "murk"
+  "Major mode for murk.")
+
+(when (fboundp 'evil-set-initial-state)
+  (evil-set-initial-state 'murk-mode 'insert))
 
 ;;; Main start procedure
 ;;
 
-(defun metalurk)
+(defun murk ()
+  "Start murk or just switch to the murk buffer if one already exists."
+  (interactive)
+  (if (get-buffer "*murk*")
+      (switch-to-buffer "*murk*")
+    (switch-to-buffer "*murk*")
+    (murk-mode)
+    (murk-setup-buffer))
+  "Started murk.")
+
 
-;;; metalurk.el ends here
+;;; murk.el ends here
-- 
2.20.1