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;; Pads string 's' on the right by 'width'
(defun pad-right-string (s width)
(format nil (concatenate 'string "~" (write-to-string width) "a") s))
;; Wraps text and adds a hypen if it doesn't fit within (1- width), scrolling
;; by index i
(defun maybe-wrap-text (text width i)
(let ((textlen (length text)))
(if (>= width textlen)
text
(let* ((max-width (1- width))
(max-wrap (1+ (- textlen max-width)))
(wrap-i (rem i max-wrap)))
(concatenate 'string (subseq text wrap-i (+ wrap-i (min max-width textlen))) "-")))))
;; line is an alist containing the string as the first element and the
;; fraction of the maximum width "max-width" the whole line should take up (these should
;; add up to 1)
;; scroll-i is the index the string is truncated to with a hyphen (see maybe-wrap-text)
;; ex. (format-line `(("Hello, world" . ,(/ 2 5))
;; ("" . ,(/ 1 5))
;; ("Hello, again" . ,(/ 2 5)))
;; 20 2)
;; -> "llo, wo- llo, ag-"
(defun format-line (line max-width &optional (scroll-i 0) (formatted ""))
(if (eq line nil)
formatted
(if (listp line)
(let* ((curr (car line))
(text-width (floor (* max-width (cdr curr))))
(wrapped-string (maybe-wrap-text (car curr) text-width scroll-i))
(current-string (pad-right-string wrapped-string text-width)))
(format-line (cdr line) max-width scroll-i (concatenate 'string formatted current-string)))
(pad-right-string (maybe-wrap-text line max-width scroll-i) max-width))))
;; Add a list of strings representing horizontal slices of a character to another list of strings representing horizontal slices of a string, or create a new list of horizontal slices if the original was empty.
;; Character height will be truncated to the height of the first character in the slices.
(defun add-to-horizontal (character horizontal-layers &key (seperator " "))
(let ((layer-height (length horizontal-layers)))
(loop for i from 0 to (1- (if (zerop layer-height) (length character) layer-height))
collect
(let ((layer (nth i horizontal-layers))
(character-slice (nth i character)))
(if (and layer (> (length layer) 0))
(concatenate 'string layer seperator character-slice)
character-slice)))))
;; Creates a list of horizontal slices to display a formatted larger string by using figlet characters
(defun lispglet (str &optional (char-hashes *big-digits*))
(loop for horizontal-layers = '()
then (add-to-horizontal (gethash c char-hashes) horizontal-layers)
for c across str
finally (return horizontal-layers)))
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