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Implementation of minibuffer 'belts'
(require 'cl) ;; defstruct
;; TODO: overwrite existing characters, don't erase the
;; whole buffer everytime. And only update things that
;; are actually different.
(defvar md-belt-item-max 8)
(defvar md-current-message nil)
(defvar md-message-counter 0)
(defvar md-num-belts 3)
(defvar md-updating-belts nil)
(defvar md-belt-list nil "List of belts.")
(defvar md-previous-belt-text nil)
;; TODO: font-lock-add-keywords
(cl-defstruct md-belt
(construct nil :read-only t)
(destruct nil :read-only t)
(contents nil :read-only t)
(old-contents nil)
(color nil :read-only t)
(context t :read-only t))
;; (defun md-insert-belt-text (text color)
;; (put-text-property 0 (length text) 'face `(:underline t :foreground ,color) text)
;; (put-text-property 0 (length text) 'font-lock-face `(:underline t :foreground ,color) text)
;; ;; (put-text-property 0 (length text) 'face `(:foreground ,color) text)
;; ;; (put-text-property 0 (length text) 'font-lock-face `(:foreground ,color) text)
;; (put-text-property 0 (length text) 'read-only t text)
;; (put-text-property 0 (length text) 'intangible t text)
;; (insert text))
(defun md-insert-belt-text (text color)
(put-text-property 0 (length text) 'face `(:underline t :foreground ,color) text)
(put-text-property 0 (length text) 'font-lock-face `(:underline t :foreground ,color) text)
(let ((o (make-overlay (point) (point))))
(overlay-put o 'after-string text)
(overlay-put o 'window (minibuffer-window))))
(defun md-truncate-string (x max-length)
(if (null x)
;; protect against arbitrarily long items
;; we could shorten to max length here but then we may make
;; some strings needlessly short that would have fit
;; once spaces were squeezed
(setq x (substring x 0 (min (length x) 100)))
(setq x (replace-regexp-in-string "[\\\n[:space:]]+" " " x))
(let ((trailing ".."))
(if (< (string-width x) max-length)
(concat (substring x 0 (- max-length (length trailing))) trailing)))))
;; (md-truncate-string "this is really long" 10)
(defun md-preserve-position (old new)
;; (setq old (delete-if #'null old))
;; (setq new (delete-if #'null new))
(let ((len (max (length old) (length new))))
(setq old (subseq old 0 len))
(setq new (subseq new 0 len))
(if (null old)
(let* ((result
(lambda (x)
(if (member x new) x nil)) old))
(new-items (set-difference new old :test 'equal)))
(loop for x on result do
(when (null (car x))
(setcar x (pop new-items))))
;; there may not be enough new items to fill the holes
(setq result (delete-if #'null result))
;;(md-preserve-position '(2 4 5 1) '(3 4 1 2))
;;(md-preserve-position '(nil nil nil 2 4 5 1) '(3 4 1 2))
(defun md-build-belt-string (x)
(let* ((width (window-body-width (minibuffer-window)))
(items (subseq x 0 md-belt-item-max))
(max-length width)
;; The form is:
;; | foo | bar | buzz
;; So 2 characters at start and end make 4, and then 3 characters
;; for each separator between items.
(usable-length (- max-length 4 (* 3 md-belt-item-max)))
(length-per-item (/ usable-length md-belt-item-max))
(cur-char (- ?A 1))
(body-string (mapconcat (lambda (y)
(format "%c %%-%ds" (incf cur-char) length-per-item)
(md-truncate-string y length-per-item))) items " "))
(space-left (- width (string-width body-string) 4)))
;;(message "%d %d %d %d %d" space-left width max-length usable-length length-per-item)
(concat "| "
(make-string space-left ?\ )
" |")))
;; (md-build-belt-string md-nearest-belt-symbols)
;; (length (md-build-belt-string md-nearest-belt-symbols))
(defun md-activate-belt-item (belt-name c)
(setq c (upcase c))
(let ((belt (car
(lambda (x)
(string= belt-name (md-belt-name x))) md-belt-list))))
(md-insert-text (format "%s" (nth (- c ?A) (md-belt-old-contents belt))) t nil)))
(defun md-resize-minibuf (w target-height)
(while (< (window-body-height w) (+ target-height 1))
(window-resize w 1))
(while (> (window-body-height w) (+ target-height 1))
(window-resize w -1)))
;; TODO: mysteriously minibuffer in other frames can't be
;; reduced to size 1, for no obvious reason
(defun md-update-belts ()
(unless (or md-updating-belts
(> (minibuffer-depth) 1))
(let ((deactivate-mark nil)
(inhibit-read-only t)
(md-updating-belts t)
(w (minibuffer-window))
(buffer (current-buffer))
(active-belt-count 0))
(with-current-buffer (window-buffer w)
(dolist (o (overlays-in (point-min) (point-max)))
(delete-overlay o))
(dolist (belt md-belt-list)
;;(message (md-belt-context belt))
(when (with-current-buffer buffer (eval (md-belt-context belt)))
(incf active-belt-count)
(let* ((contents (with-current-buffer buffer (eval (md-belt-contents belt))))
(new (subseq contents 0 (min (length contents) md-belt-item-max)))
(old (md-belt-old-contents belt))
(new-sorted (md-preserve-position old new)))
(concat (md-build-belt-string new-sorted) "\n") (md-belt-color belt))
(setf (md-belt-old-contents belt) new-sorted))))
;; (insert " ")
;; (when md-current-message
;; (md-insert-belt-text md-current-message "white"))
(when md-current-message
;; Apparently at least one character must be in buffer for overlays to show,
;; so may as well keep this as text in buffer
(insert md-current-message))
(dolist (frame (frame-list))
(if (eq frame (selected-frame))
(md-resize-minibuf w active-belt-count)
(md-resize-minibuf (minibuffer-window frame) 1)))
(goto-char (point-min))
(message nil)))))
(defun md-save-message ()
(let ((m (current-message)))
(when m
(setq md-current-message m)
(defadvice message (around md-message-save-to-var disable)
(if (or md-updating-belts (not (ad-get-arg 0)))
(let ((formatted-string (apply 'format (ad-get-args 0))))
(when (or (stringp formatted-string))
(setq md-current-message formatted-string)
(defun md-setup-belt ()
(let ((md-updating-belts t))
(dolist (belt md-belt-list)
(funcall (md-belt-construct belt)))
(setq resize-mini-windows nil)
(add-hook 'post-command-hook #'md-save-message t)
(add-hook 'post-command-hook #'md-update-belts t)
(add-hook 'window-configuration-change-hook #'md-update-belts t)
(add-hook 'focus-in-hook #'md-update-belts t)
(ad-enable-advice 'message 'around 'md-message-save-to-var)))
;; TODO: use text properties to ensure we only delete text we inserted
(defun md-destroy-all-belts ()
(let ((md-updating-belts t))
(setq resize-mini-windows 'grow-only)
(remove-hook 'post-command-hook #'md-save-message)
(remove-hook 'post-command-hook #'md-update-belts)
(remove-hook 'window-configuration-change-hook #'md-update-belts)
(remove-hook 'focus-in-hook #'md-update-belts)
;; TODO: disable doesn't work wtf?
(ad-disable-advice 'message 'around 'md-message-save-to-var)
(dolist (belt md-belt-list)
(funcall (md-belt-destruct belt)))
(dolist (frame (frame-list))
(with-selected-frame frame
(with-selected-window (minibuffer-window frame)
(with-current-buffer (window-buffer)
(let ((inhibit-read-only t))
(setq md-belt-list nil)
(message "")))
(provide 'md-belt-impl)
(require 'md-belt-impl)
;; I have more filtering logic in my personal version but it's outside the scope of this gist
(defun md-get-kill-ring ()
(defun md-setup-kill-belt ()
(setq md-kill-belt
:name "kill"
:construct #'md-setup-kill-belt
:destruct #'md-destroy-kill-belt
:contents '(md-get-kill-ring)
:color "yellow"))
(add-to-list 'md-belt-list md-kill-belt))
(defun md-destroy-kill-belt ()
(setq md-belt-list (remove-if (lambda (x) (string= (md-belt-name x) "kill")) md-belt-list)))
(provide 'md-kill-belt)
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