114 lines
2.5 KiB
Bash
Executable File
114 lines
2.5 KiB
Bash
Executable File
#!/bin/sh
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set -e
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argv0="$0"
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# ADDING A NEW SOUND SERVER/CLIENT/WHATEVERIDK
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# `volume a $2` must set the volume to $2, an integer value. This should be a
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# percentage, 100% being the loudest possible volume that can be output by
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# hardware without quality loss. Percentages above 100% will be allowable in
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# software if using percentage units. If percentage units are implausible to
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# implement, system units are okay (e.g. 0-$arbitrary scale versus 0-100).
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# `volume s` must output the current volume in integer form in whatever units
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# are being used by `volume a` on the given system.
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VOLUME_TMP_FILE="$HOME/.volume-previous"
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if uname | xargs strcmp NetBSD; then
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VOLUME_SYSTEM=netbsd
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elif command -v pactl >/dev/null 2>&1; then
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VOLUME_SYSTEM=pulseaudio
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else
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printf "%s: Unknown system.\n" "$0"
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exit 1
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fi
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usage(){
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printf "\
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Usage: %b {function} (operand)\n" "$0"
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printf "\
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Functions:
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'+' - shortcut to \"relative \$2\"
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'-' - shortcut to \"relative -\$2\"
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absolute - change sound output to absolute unit
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debug - show debugging information
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help,'' - print this help output
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mute - toggle mute/unmute
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relative - change sound output relative to current status
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status - print current sound output in system unit \
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"
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printf "\
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The options are matched with [char]*. So \"%b help\"
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works the same as \"%b h\".
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" "$argv0" "$argv0"
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exit 1
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}
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case "$1" in
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+) "$0" r "$2" ;;
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-) "$0" r -"$2" ;;
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a*)
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str isvalue $2 && ! str isvalue $3 && str isdigit "$2" \
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|| usage
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"$0".$VOLUME_SYSTEM "$@"
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;;
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s*)
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! str isvalue $2 \
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|| usage
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"$0".$VOLUME_SYSTEM s
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;;
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d*)
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printf '$0: %s\nAudio system detected: %s\n' \
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"$0" \
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$VOLUME_SYSTEM
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;;
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m*) ! str isvalue "$2" || usage
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# restore previous volume if there is one
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if test -e "$VOLUME_TMP_FILE"; then
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xargs "$0" a <"$VOLUME_TMP_FILE" \
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&& rm "$VOLUME_TMP_FILE" \
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&& printf "Unmuted.\n" \
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&& exit 0 \
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|| printf "Error restoring previous volume.\n" \
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1>&2 \
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&& exit 1
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fi
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# otherwise, make new file with previous volume
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# dd used rather than shell redirect so it's easy to determine
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# whether or not the file write worked
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if ! printf "%b" "$("$0" s)" \
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| dd of="$VOLUME_TMP_FILE" 2>/dev/null
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then
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printf "Error writing to file.\n" 1>&2
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exit 1
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fi
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# and then of course mute
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"$0" a 0
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printf "Muted.\n"
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exit 0 ;;
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r*)
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str isvalue $2 && ! str isvalue $3 \
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&& str isdigit "$(printf "%s\n" "$2" | sed 's/^\-//')" \
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|| usage
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"$0" a \
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"$(printf "%s %s + p\n" \
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$("$0" s) \
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"$(printf "%s\n" $2 | tr - _)" \
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| dc)"
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exit $? ;;
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*) usage ;;
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esac
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