+(defun murk-current-context ()
+ "Returns the current context."
+ (if murk-contexts
+ (car murk-contexts)
+ nil))
+
+(defun murk-contexts-equal (c1 c2)
+ (if (murk-server-context-p c1)
+ (and (murk-server-context-p c2)
+ (equal (murk-context-server c1)
+ (murk-context-server c2)))
+ (and (not (murk-server-context-p c2))
+ (equal (seq-take c1 2)
+ (seq-take c2 2)))))
+
+(defun murk-context-server (ctx) (elt ctx 0))
+(defun murk-context-name (ctx) (elt ctx 1))
+(defun murk-context-users (ctx) (seq-drop ctx 2))
+(defun murk-server-context-p (ctx) (not (cdr ctx)))
+
+(defun murk-add-context (ctx)
+ (add-to-list 'murk-contexts ctx))
+
+(defun murk-remove-context (ctx)
+ (setq murk-contexts
+ (seq-remove
+ (lambda (this-ctx)
+ (murk-contexts-equal this-ctx ctx))
+ murk-contexts)))
+
+(defun murk-remove-server-contexts (server)
+ (setq murk-contexts
+ (seq-remove (lambda (row) (equal (car row) server))
+ murk-contexts)))
+
+(defun murk-context->string (ctx)
+ (if (murk-server-context-p ctx)
+ (concat "[" (murk-context-server ctx) "]")
+ (concat (murk-context-name ctx) "@"
+ (murk-context-server ctx))))
+
+(defun murk-get-context (server &optional name)
+ (if name
+ (assoc server murk-contexts)
+ (let ((test-ctx (list server name)))
+ (seq-find (lambda (ctx)
+ (equal (seq-take ctx 2) test-ctx))
+ murk-contexts))))
+
+(defun murk-cycle-contexts (&optional reverse)
+ (setq murk-contexts
+ (if reverse
+ (let ((nminus1 (- (length murk-contexts) 1)))
+ (cons
+ (elt murk-contexts nminus1)
+ (seq-take murk-contexts nminus1)))
+ (append (cdr murk-contexts) (list (car murk-contexts))))))
+
+;;; Buffer
+;;
+
+(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-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
+ (murk-context->string 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))))))
+
+(defun murk-setup-header ()
+ (with-current-buffer "*murk*"
+ (setq-local header-line-format
+ '((:eval
+ (let* ((ctx (murk-current-context)))
+ (if ctx
+ (let ((server (murk-context-server ctx)))
+ (concat
+ "Network: " server ", "
+ (if (murk-server-context-p ctx)
+ "Server"
+ (concat
+ "Channel: "
+ (murk-context-name ctx)
+ " ("
+ (number-to-string
+ (length (murk-context-users ctx)))
+ ")"))))
+ "No connection")))))))
+
+(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-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)
+ (murk-add-formatting
+ (propertize (concat (apply #'murk-buttonify-urls strings) "\n")
+ 'read-only t
+ 'context context
+ 'invisible context-atom)))))))
+ (murk-scroll-windows-to-last-line))
+
+(defun murk-display-message (server from to text)
+ (let ((context (if (string-prefix-p "#" to)
+ (murk-get-context server to)
+ (murk-get-context server))))
+ (murk-display-string
+ context
+ (if (murk-server-context-p context)
+ (concat "[" from " -> " to "]")
+ (concat (murk-context->string context) " <" from ">"))
+ text)))
+
+(defun murk-display-notice (context &rest notices)
+ (murk-display-string
+ context
+ (propertize murk-notice-prefix 'face 'murk-notice)
+ (apply #'concat notices)))
+
+(defun murk-display-error (&rest messages)
+ (murk-display-string
+ nil
+ (propertize murk-error-prefix 'face 'murk-error)
+ (apply #'concat messages)))
+
+(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)))
+
+(defun murk-add-formatting (string)
+ (with-temp-buffer
+ (insert string)
+ (goto-char (point-min))
+ (let ((bold nil)
+ (italics nil)
+ (underline nil)
+ (strikethrough nil)
+ (prev-point (point)))
+ (while (re-search-forward (rx (or (any "\x02\x1D\x1F\x1E\x0F")
+ (: "\x03" (+ digit) (opt "," (* digit)))))
+ nil t)
+ (let ((beg (+ (match-beginning 0) 1)))
+ (if bold
+ (add-face-text-property prev-point beg '(:weight bold)))
+ (if italics
+ (add-face-text-property prev-point beg '(:slant italic)))
+ (if underline
+ (add-face-text-property prev-point beg '(:underline t)))
+ (if strikethrough
+ (add-face-text-property prev-point beg '(:strike-through t)))
+ (pcase (match-string 0)
+ ("\x02" (setq bold (not bold)))
+ ("\x1D" (setq italics (not italics)))
+ ("\x1F" (setq underline (not underline)))
+ ("\x1E" (setq strikethrough (not strikethrough)))
+ ("\x0F" ; Reset
+ (setq bold nil)
+ (setq italics nil)
+ (setq underline nil)
+ (setq strikethrough nil))
+ (_))
+ (delete-region (match-beginning 0) (match-end 0))
+ (setq prev-point (point)))))
+ (buffer-string)))
+
+
+;;; Message evaluation
+;;
+
+(defun murk-eval-msg-string (server string)
+ (if murk-debug
+ (murk-display-string nil nil string))
+ (let* ((msg (murk-string->msg string)))
+ (pcase (murk-msg-cmd msg)
+ ("PING"
+ (murk-send-msg server
+ (murk-msg nil nil "PONG" (murk-msg-params msg))))
+
+ ("PONG")
+
+ ("001"
+ (let* ((params (murk-msg-params msg))
+ (nick (elt params 0))
+ (text (string-join (seq-drop params 1) " ")))
+ (murk-set-connection-nick server nick)
+ (murk-display-notice nil text)))
+
+ ((rx (= 3 (any digit)))
+ (murk-display-notice nil (mapconcat 'identity (cdr (murk-msg-params msg)) " ")))
+
+ ((and "JOIN"
+ (guard (equal (murk-connection-nick server)
+ (murk-msg-src msg))))
+ (let ((channel (car (murk-msg-params msg))))
+ (murk-add-context (list server channel))
+ (murk-display-notice (murk-current-context)
+ "Joining channel " channel " on " server)
+ (murk-render-prompt)))
+
+ ((and "PART"
+ (guard (equal (murk-connection-nick server)
+ (murk-msg-src msg))))
+ (let ((channel (car (murk-msg-params msg))))
+ (murk-display-notice (murk-current-context) "Left channel " channel)
+ (murk-remove-context (list server channel))
+ (murk-render-prompt)))
+
+ ("QUIT"
+ (let ((nick (murk-msg-src msg))
+ (reason (mapconcat 'identity (murk-msg-params msg) " ")))
+ (murk-del-user nick)
+ (if murk-show-joins
+ (murk-display-notice nil nick " quit: " reason))))
+
+ ("PRIVMSG"
+ (let* ((from (murk-msg-src msg))
+ (params (murk-msg-params msg))
+ (to (car params))
+ (text (cadr params)))
+ (pcase text
+ ("\01VERSION\01"
+ (let ((version-string (concat murk-version " - running on GNU Emacs " emacs-version)))
+ (murk-send-msg server
+ (murk-msg nil nil "NOTICE"
+ (list from (concat "\01VERSION "
+ version-string
+ "\01")))))
+ (murk-display-notice nil "CTCP version request received from "
+ from " on " server))
+
+ ((rx (let ping (: "\01PING " (* (not "\01")) "\01")))
+ (murk-send-msg server (murk-msg nil nil "NOTICE" (list from ping)))
+ (murk-display-notice nil "CTCP ping received from " from " on " server))
+
+ ("\01USERINFO\01"
+ (murk-display-notice nil "CTCP userinfo request from " from
+ " on " server " (no response sent)"))
+
+ ("\01CLIENTINFO\01"
+ (murk-display-notice nil "CTCP clientinfo request from " from
+ " on " server " (no response sent)"))
+
+ ((rx (: "\01ACTION " (let action-text (* (not "\01"))) "\01"))
+ (murk-display-action from to action-text))
+
+ (_
+ (murk-display-message server from to text)))))
+
+ (_
+ (murk-display-notice nil (murk-msg->string msg))))))
+
+;;; Commands
+;;
+
+(defvar murk-command-table
+ '(("DEBUG" "Toggle debug mode on/off." murk-command-debug murk-boolean-completions)
+ ("HEADER" "Toggle display of header." murk-command-header murk-boolean-completions)
+ ("NETWORKS" "List known IRC networks." murk-command-networks)
+ ("CONNECT" "Connect to an IRC network." murk-command-connect murk-network-completions)
+ ("QUIT" "Disconnect from current network." murk-command-quit)
+ ("JOIN" "Join one or more channels." murk-command-join)
+ ("PART" "Leave channel." murk-command-part murk-context-completions)
+ ("NICK" "Change nick." murk-command-nick)
+ ("MSG" "Send private message to user." murk-command-msg murk-nick-completions)
+ ("CLEAR" "Clear buffer text." murk-command-clear murk-context-completions)
+ ("HELP" "Display help on client commands." murk-command-help murk-help-completions))
+ "Table of commands explicitly supported by murk.")
+
+(defun murk-boolean-completions ()
+ '("on" "off"))
+
+(defun murk-network-completions ()
+ (mapcar (lambda (row) (car row)) murk-networks))
+
+(defun murk-command-help (params)
+ (if params
+ (let* ((cmd-str (upcase (car params)))
+ (row (assoc cmd-str murk-command-table #'equal)))
+ (if row
+ (progn
+ (murk-display-notice nil "Help for \x02" cmd-str "\x02:")
+ (murk-display-notice nil " " (elt row 1)))
+ (murk-display-notice nil "No such (client-interpreted) command.")))
+ (murk-display-notice nil "Client-interpreted commands:")
+ (dolist (row murk-command-table)
+ (murk-display-notice nil " \x02" (elt row 0) "\x02: " (elt row 1)))
+ (murk-display-notice nil "Use /HELP COMMAND to display information about a specific command.")))
+
+(defun murk-command-debug (params)
+ (setq murk-debug
+ (if params
+ (if (equal (upcase (car params)) "ON")
+ t
+ nil)
+ (not murk-debug)))
+ (murk-display-notice nil "Debug mode now " (if murk-debug "on" "off") "."))
+
+(defun murk-command-header (params)
+ (if
+ (if params
+ (equal (upcase (car params)) "ON")
+ (not header-line-format))
+ (progn
+ (murk-setup-header)
+ (murk-display-notice nil "Header enabled."))
+ (setq-local header-line-format nil)
+ (murk-display-notice nil "Header disabled.")))
+
+(defun murk-command-clear (params)
+ (if (not params)
+ (murk-clear-buffer)
+ (dolist (context params)
+ (murk-clear-context context))))
+
+(defun murk-command-connect (params)
+ (if params
+ (let ((network (car params)))
+ (murk-display-notice nil "Attempting to connect to " network "...")
+ (murk-connect network))
+ (murk-display-notice nil "Usage: /connect <network>")))
+
+(defun murk-command-networks (_params)
+ (murk-display-notice nil "Currently-known networks:")
+ (dolist (row murk-networks)
+ (seq-let (network server port &rest _others) row
+ (murk-display-notice nil "\t" network
+ " [" server
+ " " (number-to-string port) "]")))
+ (murk-display-notice nil "(Modify the `murk-networks' variable to add more.)"))
+
+(defun murk-command-quit (params)
+ (let ((ctx (murk-current-context)))
+ (if (not ctx)
+ (murk-display-error "No current context")
+ (let ((quit-msg (if params (string-join params " ") murk-default-quit-msg)))
+ (murk-send-msg
+ (murk-context-server ctx)
+ (murk-msg nil nil "QUIT" quit-msg))))))
+
+(defun murk-command-join (params)
+ (if params
+ (let ((server (murk-context-server (murk-current-context))))
+ (dolist (channel params)
+ (murk-send-msg server (murk-msg nil nil "JOIN" channel))))
+ (murk-display-notice nil "Usage: /join channel [channel2 ...]")))
+
+(defun murk-command-part (params)
+ (let* ((server (murk-context-server (murk-current-context)))
+ (channel (if params
+ (car params)
+ (murk-context-name (murk-current-context)))))
+ (if channel
+ (murk-send-msg server (murk-msg nil nil "PART" channel))
+ (murk-display-error "No current channel to leave"))))
+
+(defun murk-command-msg (params)
+ (let ((server (murk-context-server (murk-current-context))))
+ (if (and params (>= (length params) 2))
+ (let ((to (car params))
+ (text (string-join (cdr params) " ")))
+ (murk-send-msg server (murk-msg nil nil "PRIVMSG" to text))
+ (murk-display-message server
+ (murk-connection-nick server)
+ to text))
+ (murk-display-notice nil "Usage: /msg <nick> <message>"))))
+
+;;; Command entering
+;;
+
+(defun murk-enter-string (string)
+ (if (string-prefix-p "/" string)
+ (pcase string
+ ((rx (: "/" (let cmd-str (+ (not whitespace)))
+ (opt (+ whitespace)
+ (let params-str (+ anychar))
+ string-end)))
+ (let ((command-row (assoc (upcase cmd-str) murk-command-table #'equal))
+ (params (if params-str
+ (split-string params-str nil t)
+ nil)))
+ (if (and command-row (elt command-row 2))
+ (funcall (elt command-row 2) params)
+ (murk-send-msg
+ (murk-context-server (murk-current-context))
+ (murk-msg nil nil (upcase cmd-str) params)))))
+ (_
+ (murk-display-error "Badly formed command")))
+ (unless (string-empty-p string)
+ (if (murk-current-context)
+ (let ((server (murk-context-server (murk-current-context))))
+ (murk-send-msg server
+ (murk-msg nil nil "PRIVMSG"
+ (murk-context-name (murk-current-context))
+ string))
+ (murk-display-message server
+ (murk-connection-nick server)
+ (murk-context->string (murk-current-context))
+ string))
+ (murk-display-error "No current context")))))
+
+
+;;; Command history