98 lines
3.3 KiB
Common Lisp
98 lines
3.3 KiB
Common Lisp
;;;; Copyright © 2023, Jaidyn Ann <jadedctrl@posteo.at>
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;;;;
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;;;; This program is free software: you can redistribute it and/or
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;;;; modify it under the terms of the GNU General Public License as
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;;;; published by the Free Software Foundation, either version 3 of
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;;;; the License, or (at your option) any later version.
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;;;;
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;;;; This program is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;;; GNU General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU General Public License
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;;;; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;;;; FLORA-SEARCH-AURORA.UI
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;;;; Generic menu-making, displaying, and management.
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;;;; Let's get to it, we're on a deadline!
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(defpackage :flora-search-aurora.util
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(:nicknames :fsa.ut :util :…)
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(:use :cl :assoc-utils)
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(:export #:split-string-by-length
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#:plist=
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#:at-least #:at-most
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#:system-language #:langcode->keysym #:getf-lang))
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(in-package :flora-search-aurora.util)
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(defun split-string-by-length (string line-length &key (substrings '()))
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"Given a string, split it into a list of substrings all with lengths
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equal or lower to the given length."
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(if (> (length string) line-length)
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(split-string-by-length
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(subseq string line-length)
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line-length
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:substrings (append substrings
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`(,(subseq string 0 line-length))))
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(append substrings `(,string))))
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(defun every-other-element (list)
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"Collect every-other-element of a list. E.g., (1 2 3 4) → (1 3)."
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(when list
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(cons (car list)
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(every-other-element (cddr list)))))
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(defun plist= (a b &key (test #'eql))
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"Return whether or not two property lists are equal, by comparing values of each pair.
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Uses the keys of plist a."
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(let ((keys (every-other-element a)))
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(loop for key in keys
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do (when (not (apply test (list (getf a key)
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(getf b key))))
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(return nil))
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finally (return 't))))
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(defun at-least (minimum num)
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"This function returns at least every hope and dream you've ever had, and at
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maximum returns your more pitiful of moments."
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(if (< num minimum)
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minimum
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num))
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(defun at-most (maximum num)
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"This function returns at most every hope and dream you've ever had, and at
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minimum returns your more pitiful of moments."
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(if (> num maximum)
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maximum
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num))
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(defun langcode->keysym (str)
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"Given a language’s code (es/cz/it/etc.), return a corresponding key symbol,
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if the language is among the supported. Otherwise, nil."
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(when (stringp str)
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(let ((lang (string-downcase (subseq str 0 2))))
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(cond
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((string-equal lang "eo") :eo)
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((string-equal lang "en") :en)))))
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(defun system-language ()
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"Return the system language, if among the supported; otherwise, EN-glish."
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(or (langcode->keysym (uiop:getenv "LANG"))
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:en))
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(defun getf-lang (plist &optional (language (system-language)) (fallback-lang :en))
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"With a plist containing keys of language-codes, return the property either fitting the
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preferred LANGUAGE, or the backup FALLBACK-LANG (if LANGUAGE’s is NIL)."
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(or (getf plist language)
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(getf plist fallback-lang)))
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