bin/player: Add working utility

1 files changed, 136 insertions, 0 deletions

diff --git a/bin/player b/bin/player
new file mode 100755
index 0000000..b6e66d7
--- /dev/null
+++ b/bin/player
@@ -0,0 +1,136 @@
+#!/bin/sh
+set -eu
+
+usage() {
+	cat <<-'EOF'
+		Usage:
+		  player ACTION
+		  player -h
+	EOF
+}
+
+help() {
+	cat <<-'EOF'
+
+		Options:
+		  -h, --help    show this message
+
+		  ACTION        one of:
+		                - backward:       go back 5 seconds
+		                - forward:        go forward 5 seconds
+		                - previous:       go to the previous track
+		                - next:           go to the next track
+		                - play-pause:     play/pause
+		                - rotate:         rotate across available MPRIS players
+		                - current:        show the current MPRIS player
+
+
+		Manipulate the MPRIS audio player.
+
+
+		Examples:
+
+		  Change the current MPRIS player:
+
+		    $ player current
+
+
+		  Play/pause:
+
+		    $ player play-pause
+	EOF
+}
+
+
+for flag in "$@"; do
+	case "$flag" in
+		--)
+			break
+			;;
+		--help)
+			usage
+			help
+			exit
+			;;
+		*)
+			;;
+	esac
+done
+
+while getopts 'P:h' flag; do
+	case "$flag" in
+		h)
+			usage
+			help
+			exit
+			;;
+		*)
+			usage >&2
+			exit 2
+			;;
+	esac
+done
+shift $((OPTIND - 1))
+ACTION="${1:-}"
+
+eval "$(assert-arg "$ACTION" 'ACTION')"
+
+
+
+CURRENT_PLAYER_PATH="$XDG_CACHE_HOME"/euandreh-mpris-player.txt
+CURRENT_PLAYER="$(cat "$CURRENT_PLAYER_PATH" ||:)"
+AVAILABLE_PLAYERS="$(playerctl --list-all | LANG=POSIX.UTF-8 sort)"
+
+pick_first() {
+	echo "$AVAILABLE_PLAYERS" | head -n1
+}
+
+next_player() {
+	if [ -z "$CURRENT_PLAYER" ]; then
+		pick_first
+	elif ! echo "$AVAILABLE_PLAYERS" | grep -q "$CURRENT_PLAYER"; then
+		# Unknown $CURRENT_PLAYER, pick anyone
+		pick_first
+	else
+		INDEX="$(echo "$AVAILABLE_PLAYERS" | grep -n "$CURRENT_PLAYER" | cut -d: -f1)"
+		LENGTH="$(echo "$AVAILABLE_PLAYERS" | wc -l)"
+		if [ "$INDEX" = "$LENGTH" ]; then
+			# Reached the end of the $AVAILABLE_PLAYERS list, wrapping
+			pick_first
+		else
+			# Get the next player instead
+			echo "$AVAILABLE_PLAYERS" | awk -v idx="$INDEX" 'NR == idx+1 {print}'
+		fi
+	fi
+}
+
+case "$ACTION" in
+	backward)
+		playerctl --player="$CURRENT_PLAYER" position 5-
+		;;
+	forward)
+		playerctl --player="$CURRENT_PLAYER" position 5+
+		;;
+	previous)
+		playerctl --player="$CURRENT_PLAYER" previous
+		;;
+	next)
+		playerctl --player="$CURRENT_PLAYER" next
+		;;
+	play-pause)
+		playerctl --player="$CURRENT_PLAYER" play-pause
+		;;
+	rotate)
+		PLAYER="$(next_player)"
+		echo "$PLAYER" > "$CURRENT_PLAYER_PATH"
+		notify-send -t 1000 "$PLAYER" 'current MPRIS target'
+		;;
+	current)
+		printf '%s\n' "$CURRENT_PLAYER"
+		;;
+	*)
+		printf 'Bad ACTION: "%s".\n\n' "$ACTION" >&2
+		usage >&2
+		exit 2
+		;;
+esac