cwall: initial commit

a helper script for swaybg

1 files changed, 67 insertions, 0 deletions

diff --git a/.local/bin/cwall b/.local/bin/cwall
new file mode 100755
index 0000000..49c11de
--- /dev/null
+++ b/.local/bin/cwall
@@ -0,0 +1,67 @@
+#!/bin/sh
+
+bgpid="${XDG_RUNTIME_DIR:-${TMPDIR:-/tmp}}/swaybg.pid"
+bgroot="${XDG_DATA_HOME:-$HOME/.local/share}"
+bgimg="${bgroot}/wallpaper"
+
+die()
+{
+	printf "\033[31;1merr: %b\033[0m\n" "${1:-no args for die()}" 1>&2
+	exit "${2:-1}"
+}
+
+usage()
+{
+	cat <<- EOF
+	Usage: ${0##*/} [wallpaper.img]
+	A helper script for swaybg
+
+	EOF
+}
+
+dep_check()
+{
+	# usage: cmd_check cmd_1 ...
+	: "${1:?}"
+
+	for dep; do
+		command -v "$dep" 1>/dev/null ||
+			die "${dep}: command not found" 127
+	done
+
+	unset dep
+}
+
+updatewall()
+{
+	: "${1:?}"
+
+	rm -f "$bgimg"
+	cp  "$1" "$bgimg"
+
+	[ -s "$bgpid" ] &&
+		kill "$(cat "$bgpid")"
+	swaybg --mode fill --image "$bgimg" > /dev/null 2>&1 &
+	echo $! > "$bgpid"
+}
+
+main()
+{
+	[ ! -r "$1" ] &&
+		usage && exit 1;
+	[ ! -d "$bgroot" ] &&
+		mkdir -p "$bgroot"
+
+	dep_check swaybg file
+
+	case "$(file --brief --dereference --mime-type "$1")" in
+	"image/"*)
+		updatewall "$1"
+		;;
+	*)
+		die "invalid image file"
+		;;
+	esac
+}
+
+main "$@"