X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?a=blobdiff_plain;f=murk.el;h=b438aa3d93260d34b4ba67abc27875bf2e1dbc45;hb=85e71a387dc514bc7de3e497408ff211b458a657;hp=1cab898aec10aa27fb62fd9c5f09869b062dfe61;hpb=64994dc2c5c36a9cdb125e6bd0ddc497e077fa25;p=lurk.git

diff --git a/murk.el b/murk.el
index 1cab898..b438aa3 100644
--- a/murk.el
+++ b/murk.el
@@ -1,13 +1,13 @@
-;;; MURK --- Multiserver Unibuffer iRc Klient -*- lexical-binding:t -*-
+;;; murk.el --- Multinetwork Unibuffer iRc Klient -*- lexical-binding:t -*-
 
 ;; Copyright (C) 2024 plugd
 
 ;; Author: plugd <plugd@thelambdalab.xyz>
 ;; Created: 11 May 2024
 ;; Version: 0.0
-;; Keywords: network
 ;; Homepage: http://thelambdalab.xyz/murk
-;; Package-Requires: ((emacs "26"))
+;; Keywords: comm
+;; Package-Requires: ((emacs "26.1"))
 
 ;; This file is not part of GNU Emacs.
 
@@ -26,35 +26,96 @@
 
 ;;; Commentary:
 
+;; A very simple IRC client which uses only a single buffer.
+
 ;;; Code:
 
 (provide 'murk)
 
+(require 'cl-lib)
+
 
 ;;; Customizations
 
 (defgroup murk nil
-  "Multiserver Unibuffer iRc Klient"
+  "Multinetwork Unibuffer iRc Klient"
   :group 'network)
 
-(defcustom murk-nick "plugd"
-  "Default nick.")
+(defcustom murk-default-nick "plugd"
+  "Default nick."
+  :type '(string))
 
 (defcustom murk-default-quit-msg "Bye"
-  "Default quit message when none supplied.")
+  "Default quit message when none supplied."
+  :type '(string))
 
 (defcustom murk-networks
-  '(("libera" "irc.libera.chat" 6697)
-    ("tilde" "tilde.chat" 6697))
-  "IRC networks.")
+  '(("debug" "localhost" 6697)
+    ("libera" "irc.libera.chat" 6697)
+    ("tilde" "tilde.chat" 6697)
+    ("sdf" "irc.sdf.org" 6697)
+    ("freenode" "chat.freenode.net" 6697)
+    ("mbr" "mbrserver.com" 6667 :notls))
+  "IRC networks."
+  :type '(alist :key-type string))
+
+(defcustom murk-show-joins nil
+  "Set to non-nil to be notified of joins, parts and quits.")
 
 (defcustom murk-display-header t
-  "If non-nil, use buffer header to display information on current host and channel.")
+  "If non-nil, use buffer header to display current host and channel."
+  :type '(boolean))
+
+(defcustom murk-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."
+  :type '(list (list) (list)))
 
 
 ;;; Faces
 ;;
 
+(defface murk-text
+  '((t :inherit default))
+  "Face used for murk text.")
+
+(defface murk-prompt
+  '((t :inherit font-lock-keyword-face))
+  "Face used for the prompt.")
+
+(defface murk-context
+  '((t :inherit murk-context))
+  "Face used for the context name in the prompt.")
+
+(defface murk-faded
+  '((t :inherit shadow))
+  "Face used for faded murk text.")
+
+(defface murk-timestamp
+  '((t :inherit shadow))
+  "Face used for timestamps.")
+
+(defface murk-error
+  '((t :inherit error))
+  "Face used for murk error text.")
+
+(defface murk-notice
+  '((t :inherit warning))
+  "Face used for murk notice text.")
+
 
 ;;; Global variables
 ;;
@@ -66,6 +127,10 @@
 (defvar murk-error-prefix "!!!")
 (defvar murk-prompt-string ">")
 
+(defvar murk-debug nil
+  "If non-nil, enable debug mode.")
+
+
 ;;; Utility procedures
 ;;
 
@@ -77,52 +142,66 @@
       (with-output-to-string (princ obj))
     nil))
 
+
 ;;; Network processes
 ;;
 
 (defvar murk-connection-table nil
-  "An alist associating servers to connection information.
+  "An alist associating networks to connection information.
 This includes the process and the response string.")
 
-(defun murk-connection-process (server)
-  (elt (assoc server murk-connection-table) 1))
+(defun murk-connection-process (network)
+  (elt (assoc network murk-connection-table) 1))
+
+(defun murk-connection-nick (network)
+  (elt (assoc network murk-connection-table) 2))
+
+(defun murk-set-connection-nick (network nick)
+  (setf (elt (assoc network murk-connection-table) 2) nick))
 
-(defun murk-connection-response (server)
-  (elt (assoc server murk-connection-table) 2))
+(defun murk-connection-response (network)
+  (elt (assoc network murk-connection-table) 3))
 
-(defun murk-set-connection-response (server string)
-  (setf (elt (assoc server murk-connection-table) 2) string))
+(defun murk-set-connection-response (network string)
+  (setf (elt (assoc network murk-connection-table) 3) string))
 
-(defun murk-connection-close (server)
-  (setq murk-connection-table (assoc-delete-all server murk-connection-table)))
+(defun murk-connection-new (network process nick)
+  (add-to-list 'murk-connection-table
+               (list network process nick "")))
 
-(defun murk-make-server-filter (server)
-  (lambda (proc string)
-    (dolist (line (split-string (concat (murk-connection-response server) string)
+(defun murk-connection-remove (network)
+  (setq murk-connection-table
+        (seq-remove (lambda (row) (equal (car row) network))
+                    murk-connection-table)))
+
+(defun murk-make-network-filter (network)
+  (lambda (_proc string)
+    (dolist (line (split-string (concat (murk-connection-response network) string)
                                 "\n"))
       (if (string-suffix-p "\r" line)
-          (murk-eval-msg-string server (string-trim line))
-        (murk-set-connection-response line)))))
+          (murk-eval-msg-string network (string-trim line))
+        (murk-set-connection-response network line)))))
 
-(defun murk-make-server-sentinel (server)
-  (lambda (proc string)
+(defun murk-make-network-sentinel (network)
+  (lambda (_proc string)
     (unless (equal "open" (string-trim string))
-      (murk-display-error "Disconnected from server.")
-      (murk-remove-contexts-for-server server)
-      (murk-render-prompt)
-      (murk-connection-close server))))
-
-(defun murk-start-process (server)
-  (let* ((row (assoc server murk-networks))
+      (murk-display-error "Disconnected from network.")
+      (murk-connection-remove network)
+      (murk-remove-network-contexts network)
+      (murk-highlight-current-context)
+      (murk-render-prompt))))
+
+(defun murk-start-process (network)
+  (let* ((row (assoc network murk-networks))
          (host (elt row 1))
          (port (elt row 2))
          (flags (seq-drop row 3)))
-    (make-network-process :name (concat "murk-" server)
+    (make-network-process :name (concat "murk-" network)
                           :host host
                           :service port
                           :family nil
-                          :filter (murk-make-server-filter server)
-                          :sentinel (murk-make-server-sentinel server)
+                          :filter (murk-make-network-filter network)
+                          :sentinel (murk-make-network-sentinel network)
                           :nowait nil
                           :tls-parameters (if (memq :notls flags)
                                               nil
@@ -136,27 +215,29 @@ This includes the process and the response string.")
 
 ;; IDEA: Have a single ping timer which pings all connected hosts
 
-(defun murk-connect (server)
-  (if (assoc server murk-connection-table)
-      (murk-display-error "Already connected to this network.")
-    (if (not (assoc server murk-networks))
-        (murk-display-error "Network '" server "' is unknown.")
-      (let ((proc (murk-start-process server)))
-        (add-to-list murk-connection-table
-                     (list server proc "")))
-      (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)
+(defun murk-connect (network)
+  (if (assoc network murk-connection-table)
+      (murk-display-error "Already connected to this network")
+    (if (not (assoc network murk-networks))
+        (murk-display-error "Network '" network "' is unknown.")
+      (let ((proc (murk-start-process network)))
+        (murk-connection-new network proc murk-default-nick))
+      (murk-send-msg network (murk-msg nil nil "USER" murk-default-nick 0 "*" murk-default-nick))
+      (murk-send-msg network (murk-msg nil nil "NICK" murk-default-nick))
+      (murk-add-context (list network))
+      (murk-highlight-current-context)
+      (murk-render-prompt))))
+
+(defun murk-send-msg (network msg)
   (if murk-debug
       (murk-display-string nil nil (murk-msg->string msg)))
-  (let ((proc (murk-connection-process server)))
+  (let ((proc (murk-connection-process network)))
     (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"))))
+      (murk-display-error "No network connection established"))))
+
 
-;;; Server messages
+;;; network messages
 ;;
 
 (defun murk-msg (tags src cmd &rest params)
@@ -199,13 +280,13 @@ portion of the source component of the message, as mURK doesn't use this.")
              (params-str (match-string 4 string))
              (params
               (if params-str
-                  (let* ((idx (cl-search ":" params-str))
+                  (let* ((idx (seq-position 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)))
+    (error "Failed to parse string %s" string)))
 
 (defun murk-msg->string (msg)
   (let ((tags (murk-msg-tags msg))
@@ -224,32 +305,154 @@ portion of the source component of the message, as mURK doesn't use this.")
        nil))))
 
 
-;;; Contexts and Servers
+;;; Contexts
 ;;
 
-;; A context is a list (server name ...) where name is a string
-;; representing either a channel name or nick, and server is a symbol
-;; identifying the server.
+;; A context is a list (network channel) identifying the network
+;; and channel.  The tail of the list contains the nicks of users
+;; present in the channel.
 ;;
-;; Each server has a special context (server) used for messages
-;; to/from the server itself.
+;; Each network has a special context (network) used for messages
+;; to/from the network itself.
 
 (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."
+  "Return 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))
+(defun murk-contexts-equal (c1 c2)
+  (if (murk-network-context-p c1)
+      (and (murk-network-context-p c2)
+           (equal (murk-context-network c1)
+                  (murk-context-network c2)))
+    (and (not (murk-network-context-p c2))
+         (equal (seq-take c1 2)
+                (seq-take c2 2)))))
+
+(defun murk-context-network (ctx)
+  (elt ctx 0))
+
+(defun murk-context-channel (ctx)
+  (elt ctx 1))
+
+(defun murk-network-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-network-contexts (network)
+  (setq murk-contexts
+        (seq-remove (lambda (row) (equal (car row) network))
+                    murk-contexts)))
+
+(defun murk-context->string (ctx)
+  (concat
+   (if (murk-network-context-p ctx)
+       ""
+     (concat (murk-context-channel ctx) "@"))
+   (murk-context-network ctx)))
+
+(defun murk-string->context (string)
+  (if (not (string-prefix-p "#" string))
+      (murk-get-context string)
+    (let* ((parts (string-split string "@"))
+           (channel (elt parts 0))
+           (network (elt parts 1)))
+      (murk-get-context network channel))))
+
+(defun murk-get-context (network &optional channel)
+  (if (and channel (string-prefix-p "#" channel))
+      (let ((test-ctx (list network channel)))
+        (seq-find (lambda (ctx)
+                    (equal (seq-take ctx 2) test-ctx))
+                  murk-contexts))
+    (car (member (list network) 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))))))
+
+(defun murk-switch-to-context (ctx)
+  (setq murk-contexts
+        (let* ((new-head (memq ctx murk-contexts))
+               (new-tail (take (- (length murk-contexts)
+                                  (length new-head))
+                               murk-contexts)))
+          (append new-head new-tail))))
+
+;;; Context users
+;;
+
+(defvar murk-context-users nil
+  "Association list between channel contexts and users.")
+
+(defun murk-get-context-users (ctx)
+  (cdr (assoc ctx murk-context-users)))
+
+(defun murk-set-context-users (ctx users)
+  (setq murk-context-users
+        (cons (cons ctx users) (assoc-delete-all ctx murk-context-users))))
+
+(defun murk-add-context-users (ctx users)
+  (murk-set-context-users
+   ctx
+   (cl-union users (murk-get-context-users ctx))))
+
+(defun murk-del-context-user (ctx user)
+  (murk-set-context-users
+   ctx
+   (delete user (murk-get-context-users ctx))))
+
+(defun murk-del-all-context-users (ctx)
+  (murk-set-context-users ctx nil))
+
+(defun murk-del-network-user (network user)
+  (dolist (ctx murk-contexts)
+    (if (and (equal (murk-context-network ctx) network)
+             (not (murk-network-context-p ctx)))
+        (murk-del-context-user ctx user))))
+
+(defun murk-del-all-network-users (network)
+  (dolist (ctx murk-contexts)
+    (if (and (equal (murk-context-network ctx) network)
+             (not (murk-network-context-p ctx)))
+        (murk-del-all-context-users ctx))))
+
+(defun murk-rename-network-user (network old-nick new-nick)
+  (dolist (ctx murk-contexts)
+    (when (and (equal (murk-context-network ctx) network)
+               (member old-nick (murk-get-context-users ctx)))
+      (murk-del-context-user ctx old-nick)
+      (murk-add-context-users ctx (list new-nick)))))
+
 
 ;;; 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)))
@@ -266,8 +469,8 @@ The head of this list is always the current context.")
           (insert
            (propertize (let ((ctx (murk-current-context)))
                          (if ctx
-                           (concat (murk-context-name) "@" (murk-context-server ctx))
-                         ""))
+                             (murk-context->string ctx)
+                           ""))
                        'face 'murk-context
                        'read-only t)
            (propertize murk-prompt-string
@@ -283,15 +486,25 @@ The head of this list is always the current context.")
         (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
-  )
+  (with-current-buffer "*murk*"
+    (setq-local header-line-format
+                '((:eval
+                   (let* ((ctx (murk-current-context)))
+                     (if ctx
+                         (let ((network (murk-context-network ctx)))
+                           (concat
+                            "Network: " network ", "
+                            (if (murk-network-context-p ctx)
+                                "network"
+                              (concat
+                               "Channel: "
+                               (murk-context-channel ctx)
+                               " ("
+                               (number-to-string
+                                (length (murk-get-context-users ctx)))
+                               ")"))))
+                       "No connection")))))))
 
 (defun murk-setup-buffer ()
   (with-current-buffer (get-buffer-create "*murk*")
@@ -304,6 +517,7 @@ The head of this list is always the current context.")
         (set-marker murk-input-marker (point-max))
       (setq murk-input-marker (point-max-marker)))
     (goto-char (point-max))
+    (murk-highlight-current-context)
     (murk-render-prompt)
     (if murk-display-header
         (murk-setup-header))))
@@ -318,6 +532,30 @@ The head of this list is always the current context.")
 ;;; Output formatting and highlighting
 ;;
 
+;; Idea: the face text property can be a list of faces, applied in
+;; order.  By assigning each context a unique list and keeping track
+;; of these in a hash table, we can easily switch the face
+;; corresponding to a particular context by modifying the elements of
+;; this list.
+;;
+;; More subtly, we make only the cdrs of this list shared among
+;; all text of a given context, allowing the cars to be different
+;; and for different elements of the context-specific text to have
+;; different styling.
+
+;; Additionally, we allow selective hiding of contexts via
+;; the buffer-invisibility-spec.
+
+(defvar murk-context-facelists (make-hash-table :test 'equal)
+  "List of seen contexts and associated face lists.")
+
+(defun murk-get-context-facelist (context)
+  (let* ((facelist (gethash context murk-context-facelists)))
+    (unless facelist
+      (setq facelist (list 'murk-text))
+      (puthash context facelist murk-context-facelists))
+    facelist))
+
 (defun murk--fill-strings (col indent &rest strings)
   (with-temp-buffer
     (setq buffer-invisibility-spec nil)
@@ -327,12 +565,6 @@ The head of this list is always the current context.")
       (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
@@ -341,7 +573,10 @@ The head of this list is always the current context.")
              (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)))
+             (context-atom (if context
+                               (intern (murk-context->string context))
+                             nil))
+             (context-face (murk-get-context-facelist context)))
         (insert-before-markers
          (murk--fill-strings
           80
@@ -356,7 +591,104 @@ The head of this list is always the current context.")
                       'read-only t
                       'context context
                       'invisible context-atom)
-          (concat (apply #'murk-buttonify-urls strings) "\n"))))))
+          (murk-add-formatting
+           (propertize (concat (apply #'murk-buttonify-urls strings) "\n")
+                       'face context-face
+                       'read-only t
+                       'context context
+                       'invisible context-atom)))))))
+  (murk-scroll-windows-to-last-line))
+
+(defun murk-click-context (button)
+  (murk-switch-to-context (button-get button 'context))
+  (murk-highlight-current-context)
+  (murk-render-prompt)
+  (if murk-zoomed
+      (murk-zoom-in (murk-current-context))))
+
+(defun murk-make-context-button (context &optional string)
+  (with-temp-buffer
+    (let ((label (or string (murk-context->string context))))
+      (insert-text-button label
+                          'action #'murk-click-context
+                          'context context
+                          'follow-link t
+                          'help-echo "Switch context"))
+    (buffer-string)))
+
+(defun murk-display-message (network from to text)
+  (let ((context (if (string-prefix-p "#" to)
+                     (murk-get-context network to)
+                   (murk-get-context network))))
+    (murk-display-string
+     context
+     (propertize
+      (if (murk-network-context-p context)
+          (concat "[" from "->" to "]")
+        (concat
+         (murk-make-context-button context)
+         " <" from ">"))
+      'face (murk-get-context-facelist context))
+     text)))
+
+(defun murk-display-action (network from to action-text)
+  (let ((context (if (string-prefix-p "#" to)
+                     (murk-get-context network to)
+                   (murk-get-context network))))
+    (murk-display-string
+     context
+     (propertize
+      (concat (murk-context->string context) " *")
+      'face (murk-get-context-facelist context))
+     from " " action-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-highlight-current-context ()
+  (with-current-buffer "*murk*"
+    (maphash
+     (lambda (this-context facelist)
+       (if (equal this-context (murk-current-context))
+           (setcar facelist 'murk-text)
+         (setcar facelist 'murk-faded)))
+     murk-context-facelists))
+  (force-window-update "*murk*"))
+
+(defun murk-zoom-in (context)
+  (with-current-buffer "*murk*"
+    (maphash
+     (lambda (this-context _)
+       (when this-context
+         (let ((this-context-atom
+                (intern (murk-context->string this-context))))
+           (if (equal this-context context)
+               (remove-from-invisibility-spec this-context-atom)
+             (add-to-invisibility-spec this-context-atom)))))
+     murk-context-facelists)
+    (force-window-update "*murk*"))
+  (murk-scroll-windows-to-last-line))
+
+(defun murk-zoom-out ()
+  (with-current-buffer "*murk*"
+    (maphash
+     (lambda (this-context _)
+       (let ((this-context-atom
+              (if this-context
+                  (intern (murk-context->string this-context))
+                nil)))
+         (remove-from-invisibility-spec this-context-atom)))
+     murk-context-facelists)
+    (force-window-update "*murk*"))
   (murk-scroll-windows-to-last-line))
 
 (defun murk--start-of-final-line ()
@@ -404,6 +736,635 @@ The head of this list is always the current context.")
                           '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 (network string)
+  (if murk-debug
+      (murk-display-string nil nil string))
+  (let* ((msg (murk-string->msg string)))
+    (murk-process-autoreplies network msg)
+    (pcase (murk-msg-cmd msg)
+      ("PING"
+       (murk-send-msg network
+        (murk-msg nil nil "PONG" (murk-msg-params msg))))
+
+      ("PONG")
+
+      ("001" ; RPL_WELCOME
+       (let* ((params (murk-msg-params msg))
+              (nick (elt params 0))
+              (text (string-join (seq-drop params 1) " ")))
+         (murk-set-connection-nick network nick)
+         (murk-display-notice (murk-get-context network) text))
+       (let* ((row (assoc network murk-networks))
+              (channels (if (memq :channels row)
+                            (cdr (memq :channels row))
+                          nil)))
+         (dolist (channel channels)
+           (murk-command-join (list channel)))))
+
+      ("353" ; NAMEREPLY
+       (let* ((params (murk-msg-params msg))
+              (channel (elt params 2))
+              (names (split-string (elt params 3)))
+              (ctx (murk-get-context network channel)))
+         (if ctx
+             (murk-add-context-users ctx names)
+           (murk-display-notice ctx "Users in " channel
+                                ": " (string-join names " ")))))
+
+      ("366" ; ENDOFNAMES
+       (let* ((params (murk-msg-params msg))
+              (channel (elt params 1))
+              (ctx (murk-get-context network channel)))
+         (if ctx
+             (murk-display-notice
+              ctx
+              (murk--as-string (length (murk-get-context-users ctx)))
+              " users in " channel)
+           (murk-display-notice (murk-get-context network)
+                                "End of " channel " names list."))))
+
+      ("331" ; RPL_NOTOPIC
+       (let* ((params (murk-msg-params msg))
+              (channel (elt params 1))
+              (ctx (murk-get-context network channel)))
+         (murk-display-notice ctx "No topic set.")))
+
+      ("332" ; RPL_TOPIC
+       (let* ((params (murk-msg-params msg))
+              (channel (elt params 1))
+              (topic (elt params 2))
+              (ctx (murk-get-context network channel)))
+         (murk-display-notice ctx "Topic: " topic)))
+
+      ((rx (= 3 (any digit)))
+       (murk-display-notice (murk-get-context network)
+                            (mapconcat 'identity (cdr (murk-msg-params msg)) " ")))
+
+      ((and "JOIN"
+            (guard (equal (murk-connection-nick network)
+                          (murk-msg-src msg))))
+       (let* ((channel (car (murk-msg-params msg)))
+              (context (list network channel)))
+         (murk-add-context context)
+         (murk-del-all-context-users context)
+         (murk-display-notice (murk-current-context)
+                              "Joining channel " channel " on " network)
+         (murk-highlight-current-context)
+         (murk-render-prompt)))
+
+      ("JOIN"
+       (let* ((channel (car (murk-msg-params msg)))
+              (nick (murk-msg-src msg))
+              (ctx (murk-get-context network channel)))
+         (murk-add-context-users ctx (list nick))
+         (if murk-show-joins
+             (murk-display-notice ctx nick " joined channel " channel
+                                  " on " network))))
+
+      ((and "PART"
+            (guard (equal (murk-connection-nick network)
+                          (murk-msg-src msg))))
+       (let* ((channel (car (murk-msg-params msg)))
+              (context (list network channel)))
+         (murk-display-notice context "Left channel " channel)
+         (murk-remove-context context)
+         (murk-del-all-context-users context)
+         (murk-highlight-current-context)
+         (murk-render-prompt)))
+
+      ("PART"
+       (let* ((channel (car (murk-msg-params msg)))
+              (nick (murk-msg-src msg))
+              (ctx (murk-get-context network channel)))
+         (murk-del-context-user ctx nick)
+         (if murk-show-joins
+             (murk-display-notice ctx nick " left channel " channel
+                                  " on " network))))
+
+      ((and "NICK"
+            (guard (equal (murk-connection-nick network)
+                          (murk-msg-src msg))))
+       (let ((new-nick (car (murk-msg-params msg)))
+             (old-nick (murk-connection-nick network)))
+         (murk-set-connection-nick network new-nick)
+         (murk-rename-network-user network old-nick new-nick)
+         (murk-display-notice (murk-get-context network)
+                              "Nick set to " new-nick " on " network)))
+
+      ("NICK"
+       (let ((old-nick (murk-msg-src msg))
+             (new-nick (car (murk-msg-params msg))))
+         (murk-display-notice (murk-get-context network)
+                              old-nick " is now known as " new-nick
+                              " on " network)
+         (murk-rename-network-user network old-nick new-nick)))
+
+      ("TOPIC"
+       (let ((channel (car (murk-msg-params msg)))
+             (nick (murk-msg-src msg))
+             (topic (cadr (murk-msg-params msg))))
+         (murk-display-notice (murk-get-context network channel)
+                              nick " set the topic: " topic)))
+
+      ("QUIT"
+       (let ((nick (murk-msg-src msg))
+             (reason (mapconcat 'identity (murk-msg-params msg) " ")))
+         (murk-del-network-user network nick)
+         (if murk-show-joins
+             (murk-display-notice (murk-get-context network)
+                                  nick " on " network " has quit: " reason))))
+
+      ("NOTICE"
+       (let ((nick (murk-msg-src msg))
+             (channel (car (murk-msg-params msg)))
+             (text (cadr (murk-msg-params msg))))
+         (pcase text
+           ((rx (: "\01VERSION "
+                   (let version (* (not "\01")))
+                   "\01"))
+            (murk-display-notice (murk-get-context network)
+                                 "CTCP version reply from " nick ": " version))
+           (_
+            (murk-display-notice (murk-get-context network channel) text)))))
+
+      ("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 network
+                             (murk-msg nil nil "NOTICE"
+                                       (list from (concat "\01VERSION "
+                                                          version-string
+                                                          "\01")))))
+            (murk-display-notice (murk-get-context network)
+                                 "CTCP version request received from "
+                                 from " on " network))
+
+           ((rx (let ping (: "\01PING " (* (not "\01")) "\01")))
+            (murk-send-msg network (murk-msg nil nil "NOTICE" (list from ping)))
+            (murk-display-notice (murk-get-context network)
+                                 "CTCP ping received from " from " on " network))
+
+           ("\01USERINFO\01"
+            (murk-display-notice (murk-get-context network)
+                                 "CTCP userinfo request from " from
+                                 " on " network " (no response sent)"))
+
+           ("\01CLIENTINFO\01"
+            (murk-display-notice (murk-get-context network)
+                                 "CTCP clientinfo request from " from
+                                 " on " network " (no response sent)"))
+
+           ((rx (: "\01ACTION " (let action-text (* (not "\01"))) "\01"))
+            (murk-display-action network from to action-text))
+
+           (_
+            (murk-display-message network from to text)))))
+
+      (_
+       (murk-display-notice (murk-get-context network)
+                            (murk-msg->string msg))))))
+
+
+;;; User-defined responses
+;;
+
+(defun murk--lists-equal (l1 l2)
+    (if (and l1 l2)
+        (if (or (not (and (car l1) (car l2)))
+                (string-match (car l1) (car l2)))
+            (murk--lists-equal (cdr l1) (cdr l2))
+          nil)
+      t))
+
+(defun murk-process-autoreply (network msg autoreply)
+  (let ((matcher (car autoreply))
+        (reply (cadr autoreply)))
+    (let ((target-network (car matcher)))
+      (when (and (or (not target-network)
+                     (and (equal network target-network)))
+                 (murk--lists-equal (cdr matcher)
+                                    (append (list (murk-msg-src msg)
+                                                  (murk-msg-cmd msg))
+                                            (murk-msg-params msg))))
+        (murk-send-msg network
+         (murk-msg nil nil (car reply) (cdr reply)))))))
+
+(defun murk-process-autoreplies (network msg)
+  (mapc
+   (lambda (autoreply)
+     (murk-process-autoreply network msg autoreply))
+   murk-autoreply-table))
+
+
+;;; 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)
+    ("SHOWJOINS" "Toggles display of joins/parts." murk-command-showjoins 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-channel-completions)
+    ("SWITCHCONTEXT" "Switch current context" murk-command-switch-context murk-context-completions)
+    ("NICK" "Change nick." murk-command-nick)
+    ("LIST" "Display details of one or more channels." murk-command-list)
+    ("TOPIC" "Set/query topic for current channel." murk-command-topic)
+    ("USERS" "List nicks of users in current channel." murk-command-users)
+    ("MSG" "Send private message to user." murk-command-msg murk-nick-completions)
+    ("ME" "Display action." murk-command-me)
+    ("VERSION" "Request version of another user's client via CTCP." murk-command-version 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-help-completions ()
+  (mapcar (lambda (row) (car row)) murk-command-table))
+
+(defun murk-channel-completions ()
+  (mapcar (lambda (ctx)
+            (murk-context->string ctx))
+          (seq-filter (lambda (ctx)
+                        (not (murk-network-context-p ctx)))
+                      murk-contexts)))
+
+(defun murk-context-completions ()
+  (mapcar (lambda (ctx) (murk-context->string ctx)) murk-contexts))
+
+(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-showjoins (params)
+  (setq murk-show-joins 
+        (if params
+            (if (equal (upcase (car params)) "ON")
+                t
+              nil)
+          (not murk-show-joins)))
+  (murk-display-notice nil "Joins/parts will now be "
+                       (if murk-show-joins "shown" "hidden") "."))
+
+(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 network port &rest _others) row
+      (murk-display-notice nil "\t" network
+                           " [" network
+                           " " (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 network")
+      (let ((quit-msg (if params (string-join params " ") murk-default-quit-msg)))
+        (murk-send-msg
+         (murk-context-network ctx)
+         (murk-msg nil nil "QUIT" quit-msg))))))
+
+(defun murk-command-join (params)
+  (if params
+      (let ((network (murk-context-network (murk-current-context))))
+        (dolist (channel params)
+          (murk-send-msg network (murk-msg nil nil "JOIN" channel))))
+    (murk-display-notice nil "Usage: /join channel [channel2 ...]")))
+
+(defun murk-command-part (params)
+  (let ((ctx (cond
+              ((not params) (murk-current-context))
+              ((seq-contains (car params) "@") (murk-string->context (car params)))
+              (t (list (murk-context-network (murk-current-context))  (car params))))))
+    (let ((network (murk-context-network ctx))
+          (channel (murk-context-channel ctx)))
+      (if channel
+          (murk-send-msg network (murk-msg nil nil "PART" channel))
+        (murk-display-error "Specify which channel to leave")))))
+
+(defun murk-command-switch-context (params)
+  (if (not params)
+      (murk-display-notice nil "Usage: /switchcontext #channel@network")
+    (let ((ctx (murk-string->context (car params))))
+      (murk-switch-to-context ctx)
+      (murk-highlight-current-context)
+      (murk-render-prompt)
+      (if murk-zoomed
+          (murk-zoom-in (murk-current-context))))))
+
+(defun murk-command-nick (params)
+  (if params
+      (let ((new-nick (string-join params " "))
+            (ctx (murk-current-context)))
+        (if ctx
+            (murk-send-msg (murk-context-network ctx)
+                           (murk-msg nil nil "NICK" new-nick))
+          (murk-display-error "No current connection")))
+    (murk-display-notice nil "Usage: /nick <new-nick>")))
+
+(defun murk-command-list (params)
+  (let ((ctx (murk-current-context)))
+    (if ctx
+        (if (not params)
+            (murk-display-notice nil "This command can generate lots of output."
+                                 " Use `/LIST -yes' if you really want this,"
+                                 " or `/LIST <channel_regexp>' to reduce the output.")
+          (let ((network (murk-context-network ctx)))
+            (if (equal (upcase (car params)) "-YES")
+                (murk-send-msg network (murk-msg nil nil "LIST"))
+              (murk-send-msg network (murk-msg nil nil "LIST"
+                                              (car params))))))
+      (murk-display-error "No current connection"))))
+
+(defun murk-command-topic (params)
+  (let ((ctx (murk-current-context)))
+    (if (and ctx (not (murk-network-context-p ctx)))
+        (let ((network (murk-context-network ctx))
+              (channel (murk-context-channel ctx)))
+          (if params
+              (murk-send-msg network
+                             (murk-msg nil nil "TOPIC" channel
+                                       (string-join params " ")))
+            (murk-send-msg network
+                           (murk-msg nil nil "TOPIC" channel))))
+      (murk-display-notice nil "No current channel."))))
+
+(defun murk-command-msg (params)
+  (let ((network (murk-context-network (murk-current-context))))
+    (if (and params (>= (length params) 2))
+        (let ((to (car params))
+              (text (string-join (cdr params) " ")))
+          (murk-send-msg network (murk-msg nil nil "PRIVMSG" to text))
+          (murk-display-message network
+                                (murk-connection-nick network)
+                                to text))
+      (murk-display-notice nil "Usage: /msg <nick> <message>"))))
+
+(defun murk-command-me (params)
+  (let* ((ctx (murk-current-context))
+         (network (murk-context-network ctx)))
+    (if (and ctx (not (murk-network-context-p ctx)))
+        (if params
+            (let* ((channel (murk-context-channel ctx))
+                   (my-nick (murk-connection-nick network))
+                   (action (string-join params " "))
+                   (ctcp-text (concat "\01ACTION " action "\01")))
+              (murk-send-msg network
+                             (murk-msg nil nil "PRIVMSG"
+                                       (list channel ctcp-text)))
+              (murk-display-action network my-nick channel action))
+          (murk-display-notice nil "Usage: /me <action>"))
+      (murk-display-notice nil "No current channel."))))
+
+(defun murk-command-version (params)
+  (let ((ctx (murk-current-context)))
+    (if ctx
+        (if params
+            (let ((network (murk-context-network ctx))
+                  (nick (car params)))
+              (murk-send-msg network
+                             (murk-msg nil nil "PRIVMSG"
+                                       (list nick "\01VERSION\01")))
+              (murk-display-notice ctx "CTCP version request sent to "
+                                   nick " on " network))
+          (murk-display-notice ctx "Usage: /version <nick>"))
+      (murk-display-notice nil "No current channel."))))
+
+(defun murk-command-users (_params)
+  (let ((ctx (murk-current-context)))
+    (if (and ctx (not (murk-network-context-p ctx)))
+        (let ((channel (murk-context-channel ctx))
+              (network (murk-context-network ctx))
+              (users (murk-get-context-users ctx)))
+          (murk-display-notice ctx "Users in " channel " on " network ":")
+          (murk-display-notice ctx (string-join users " ")))
+      (murk-display-notice nil "No current channel."))))
+
+
+;;; 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-network (murk-current-context))
+              (murk-msg nil nil (upcase cmd-str) params)))))
+        (_
+         (murk-display-error "Badly formed command")))
+    (unless (string-empty-p string)
+      (let ((ctx (murk-current-context)))
+        (if ctx
+            (if (not (murk-network-context-p ctx))
+                (let ((network (murk-context-network ctx))
+                      (channel (murk-context-channel ctx)))
+                  (murk-send-msg network
+                                 (murk-msg nil nil "PRIVMSG" channel string))
+                  (murk-display-message network
+                                        (murk-connection-nick network)
+                                        channel string))
+              (murk-display-error "No current channel"))
+          (murk-display-error "No current context"))))))
+
+
+;;; Command history
+;;
+
+(defvar murk-history nil
+  "Commands and messages sent in current session.")
+
+(defvar murk-history-index nil)
+
+(defun murk-history-cycle (delta)
+  (when murk-history
+    (with-current-buffer "*murk*"
+      (if murk-history-index
+          (setq murk-history-index
+                (max 0
+                     (min (- (length murk-history) 1)
+                          (+ delta murk-history-index))))
+        (setq murk-history-index 0))
+      (delete-region murk-input-marker (point-max))
+      (insert (elt murk-history murk-history-index)))))
+
+
+;;; Interactive commands
+;;
+
+(defun murk-enter ()
+  "Enter current contents of line after prompt."
+  (interactive)
+  (with-current-buffer "*murk*"
+    (let ((line (buffer-substring murk-input-marker (point-max))))
+      (push line murk-history)
+      (setq murk-history-index nil)
+      (let ((inhibit-read-only t))
+        (delete-region murk-input-marker (point-max)))
+      (murk-enter-string line))))
+
+(defun murk-history-next ()
+  (interactive)
+  (murk-history-cycle -1))
+
+(defun murk-history-prev ()
+  (interactive)
+  (murk-history-cycle +1))
+
+(defun murk-cycle-contexts-forward ()
+  (interactive)
+  (murk-cycle-contexts)
+  (murk-highlight-current-context)
+  (murk-render-prompt)
+  (if murk-zoomed
+      (murk-zoom-in (murk-current-context))))
+
+(defun murk-cycle-contexts-reverse ()
+  (interactive)
+  (murk-cycle-contexts t)
+  (murk-highlight-current-context)
+  (murk-render-prompt)
+  (if murk-zoomed
+      (murk-zoom-in (murk-current-context))))
+
+(defvar murk-zoomed nil
+  "Keeps track of zoom status.")
+
+(defun murk-toggle-zoom ()
+  (interactive)
+  (if murk-zoomed
+      (murk-zoom-out)
+    (murk-zoom-in (murk-current-context)))
+  (setq murk-zoomed (not murk-zoomed)))
+
+
+(defun murk-complete-input ()
+  (interactive)
+  (let ((completion-ignore-case t))
+    (when (>= (point) murk-input-marker)
+      (pcase (buffer-substring murk-input-marker (point))
+        ((rx (: "/" (let cmd-str (+ (not whitespace))) (+ " ") (* (not whitespace)) string-end))
+         (let ((space-idx (save-excursion
+                            (re-search-backward " " murk-input-marker t)))
+               (table-row (assoc (upcase cmd-str) murk-command-table #'equal)))
+           (if (and table-row (elt table-row 3))
+               (let* ((completions-nospace (funcall (elt table-row 3)))
+                      (completions (mapcar (lambda (el) (concat el " ")) completions-nospace)))
+                 (completion-in-region (+ 1 space-idx) (point) completions)))))
+        ((rx (: "/" (* (not whitespace)) string-end))
+         (message (buffer-substring murk-input-marker (point)))
+         (completion-in-region murk-input-marker (point)
+                               (mapcar (lambda (row) (concat "/" (car row) " "))
+                                       murk-command-table)))
+        (_
+         (let* ((end (max murk-input-marker (point)))
+                (space-idx (save-excursion
+                             (re-search-backward " " murk-input-marker t)))
+                (start (if space-idx (+ 1 space-idx) murk-input-marker)))
+           (unless (string-prefix-p "/" (buffer-substring start end))
+             (let* ((users (murk-get-context-users (murk-current-context)))
+                    (users-no@ (mapcar
+                                (lambda (u) (car (split-string u "@" t)))
+                                users)))
+               (completion-in-region start end users-no@)))))))))
 
 ;;; Mode
 ;;
@@ -412,6 +1373,12 @@ The head of this list is always the current context.")
   (let ((map (make-sparse-keymap)))
     (define-key map (kbd "RET") 'murk-enter)
     (define-key map (kbd "TAB") 'murk-complete-input)
+    (define-key map (kbd "C-c C-z") 'murk-toggle-zoom)
+    (define-key map (kbd "<C-up>") 'murk-history-prev)
+    (define-key map (kbd "<C-down>") 'murk-history-next)
+    (define-key map (kbd "<C-tab>") 'murk-cycle-contexts-forward)
+    (define-key map (kbd "<C-S-iso-lefttab>") 'murk-cycle-contexts-reverse)
+    (define-key map (kbd "<C-S-tab>") 'murk-cycle-contexts-reverse)
     (when (fboundp 'evil-define-key*)
       (evil-define-key* 'motion map
         (kbd "TAB") 'murk-complete-input))
@@ -426,6 +1393,7 @@ The head of this list is always the current context.")
 ;;; Main start procedure
 ;;
 
+;;;###autoload
 (defun murk ()
   "Start murk or just switch to the murk buffer if one already exists."
   (interactive)
@@ -436,5 +1404,4 @@ The head of this list is always the current context.")
     (murk-setup-buffer))
   "Started murk.")
 
-
 ;;; murk.el ends here