Start UI: Line-wrapping string printing

flora-search-aurora.lisp

@@ -20,10 +20,13 @@
 (ql:quickload '(alexandria cl-charms cl-tiled str))
 (load "input.lisp")
 (load "display.lisp")
+(load "ui.lisp")
 
 (defpackage :flora-search-aurora
-  (:use :cl :flora-search-aurora.input :flora-search-aurora.display)
-  (:export #:main))
+  (:export #:main)
+  (:use :cl
+   :flora-search-aurora.input :flora-search-aurora.display
+   :flora-search-aurora.ui))
 
 (in-package :flora-search-aurora)
 

ui.lisp

@@ -0,0 +1,73 @@
+;;;; Copyright © 2023, Jaidyn Ann <jadedctrl@posteo.at>
+;;;;
+;;;; This program is free software: you can redistribute it and/or
+;;;; modify it under the terms of the GNU General Public License as
+;;;; published by the Free Software Foundation, either version 3 of
+;;;; the License, or (at your option) any later version.
+;;;;
+;;;; This program is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;;; GNU General Public License for more details.
+;;;;
+;;;; You should have received a copy of the GNU General Public License
+;;;; along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+;;;; FLORA-SEARCH-AURORA.UI
+;;;; Generic menu-making, displaying, and management.
+;;;; Let's get to it, we're on a deadline!
+
+(defpackage :flora-search-aurora.ui
+  (:use :cl :flora-search-aurora.display))
+
+(in-package :flora-search-aurora.ui)
+
+
+(defun render-line (matrix text x y)
+  "Apply a one-line string to the matrix at the given coordinates."
+  (if (and (stringp text)
+           (> (length text) 0))
+      (progn
+        (setf (aref matrix y x)
+              (char text 0))
+        (render-line matrix (subseq text 1)
+                     (+ x 1) y))
+      matrix))
+
+
+(defun render-string (matrix text x y &key (max-column 72) (max-row 20))
+  "Render the given string to the matrix of characters, character-by-character.
+Will line-break or truncate as appropriate and necessary to not exceed the
+positional arguments nor the dimensions of the matrix."
+  (let* ((dimensions (array-dimensions matrix))
+         (max-column (at-most (cadr dimensions) max-column))
+         (max-row (at-most (car dimensions) max-row))
+         (substrings (split-string-by-length text (- max-column x)))
+         (row 0))
+    (loop while (and (< (+ y row) max-row)
+                     substrings)
+          do
+             (print (+ y row))
+             (render-line matrix (pop substrings)
+                          x (+ y row))
+             (incf row)))
+  matrix)
+
+
+(defun split-string-by-length (string line-length &key (substrings '()))
+  "Given a string, split it into a list of substrings all with lengths
+equal or lower to the given length."
+  (if (> (length string) line-length)
+      (split-string-by-length
+       (subseq string line-length)
+       line-length
+       :substrings (append substrings
+                           `(,(subseq string 0 line-length))))
+      (append substrings `(,string))))
+
+
+
+;;"---{=============   -------------------"
+;; | Kill your mom |    Give into despair
+;; ---{=============   -------------------
+