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(defpackage #:backlight (:use #:cl) (:import-from #:alexandria #:read-file-into-string #:write-string-into-file) (:export #:main)) (in-package :backlight) (defparameter *max-brightness-path* #p"/sys/class/backlight/intel_backlight/max_brightness") (defparameter *brightness-path* #p"/sys/class/backlight/intel_backlight/brightness") (defvar *quit-on-error-p* nil) (defun main () (flet ((syntax-error () (format t "Syntax error~%Usage: backlight <percent>~%") (if *quit-on-error-p* (uiop:quit) (return-from main)))) (unless (= (length uiop:*command-line-arguments*) 1) (syntax-error)) (let ((percent (parse-integer (car uiop:*command-line-arguments*) :junk-allowed t))) (unless (and percent (< 0 percent) (<= percent 100)) (syntax-error)) (let* ((max (parse-integer (read-file-into-string *max-brightness-path*))) (result (format nil "~d" (round (/ (* percent max) 100))))) (write-string-into-file result *brightness-path* :if-exists :supersede)))))