+(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))