2023-11-18 23:31:04 +01:00
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#!/usr/bin/env racket
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#lang racket
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(current-print void)
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(define sysfs (make-parameter #t))
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(define ddc (make-parameter #t))
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(define brightness
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(command-line #:program "brightness"
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#:usage-help "Sets the backlight brightness of connected monitors"
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#:once-each
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[("-s" "--no-sysfs") "Don't set brightness via sysfs" (sysfs #f)]
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[("-d" "--no-ddc") "Don't set brightness via DDC/CI" (ddc #f)]
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#:args (brightness-arg)
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(let ([brightness-parsed (string->number brightness-arg)])
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(unless ((and/c (>=/c 0) (<=/c 100)) brightness-parsed)
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(raise-user-error "brightness argument is invalid!"))
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brightness-parsed)))
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(when (sysfs)
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(for ([dir (directory-list "/sys/class/backlight")])
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(printf "sysfs: ~a\n" dir)
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2023-11-19 11:52:26 +01:00
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(let* ([max-brightness (string->number
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(string-trim
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(file->string
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(build-path "/sys/class/backlight" dir "max_brightness"))))]
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2023-11-18 23:31:04 +01:00
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[rel-brightness (exact-round (* brightness (/ max-brightness 100)))]
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2023-11-19 11:52:26 +01:00
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[brightness-path (build-path "/sys/class/backlight" dir "brightness")])
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2023-11-18 23:31:04 +01:00
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(display-to-file rel-brightness brightness-path #:exists 'truncate))))
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(match* ((ddc) (find-executable-path "ddcutil"))
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[(#f _) #f]
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[(_ #f) #f]
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[(_ ddcutil-exe)
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(for ([dpy (regexp-match* #px"Display (\\d+)"
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(car (process* ddcutil-exe "detect"))
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#:match-select (λ (m) (string->number
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(bytes->string/utf-8 (cadr m)))))])
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(printf "ddc: #~a\n" dpy)
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(system* ddcutil-exe "setvcp" "10" (format "--display=~a" dpy) (number->string brightness)))])
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