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#!/usr/bin/env -S guile --no-auto-compile
!#
(use-modules (ice-9 format)
(ice-9 match)
(ice-9 popen)
(ice-9 regex)
(ice-9 textual-ports))
(define (read-from-pactl . args)
(let* ((port (apply open-pipe* OPEN_READ "pactl" args))
(output (get-string-all port)))
(close-pipe port)
(string-trim-right output #\newline)))
(define %default-sink
(read-from-pactl "get-default-sink"))
(define* (sink-muted? #:optional (sink %default-sink))
(match (read-from-pactl "get-sink-mute" sink)
("Mute: yes" #t)
("Mute: no" #f)
(output (error "Unknown `pactl get-sink-mute' output" output))))
(define* (sink-volume #:optional (sink %default-sink))
(match-let ((`#(,match (,start . ,end))
(string-match "[0-9]+%" (read-from-pactl "get-sink-volume" sink))))
(string->number (substring match start (1- end))))) ; trim trailing "%"
(define* (set-sink-mute! #:optional (state "toggle") (sink %default-sink))
(status:exit-val
(system* "pactl" "set-sink-mute" sink state)))
(define* (increment-sink-volume! increment-percent #:optional (sink %default-sink))
(status:exit-val
(system* "pactl" "set-sink-volume" sink
;; A percentage with a sign is an increment.
(format #f "~@d%" increment-percent))))
(define* (notify #:optional (muted? (sink-muted?)) (volume (sink-volume)))
(status:exit-val
(system* "dunstify" "-a" "volume" "-u" "low"
"-i" (cond (muted? "audio-volume-muted")
((< volume 50) "audio-volume-low")
(#t "audio-volume-high"))
"-h" "string:x-canonical-private-synchronous:volume"
"-h" (format #f "int:value:~d" (if muted? 0 volume))
(if muted? "Volume muted" "Volume"))))
(match (cdr (program-arguments))
(() 0) ; notify only
(("mute") (set-sink-mute! "true"))
(("unmute") (set-sink-mute! "false"))
(("toggle-mute") (set-sink-mute! "toggle"))
(((? string->number increment-percent))
(and (set-sink-mute! "false")
(increment-sink-volume!
(string->number increment-percent))))
(args (error "Could not parse command-line arguments:" args)))
(notify)
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