From 8b121b1efb7538d848a89955551fd39d14dc3a0c Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Tue, 24 Apr 2018 18:09:00 -0400
Subject: bin/chdt: New script

---
diff --git a/bin/chdt b/bin/chdt
new file mode 100755
index 0000000..3bd503a
--- /dev/null
+++ b/bin/chdt
@@ -0,0 +1,175 @@
+#!/bin/sh
+
+set -eu
+
+ROWS=2
+COLS=6
+ORIENTATION='horizontal'
+
+debug=0
+
+err()
+{
+	local fmt="${1}"
+	shift 1
+
+	printf "Error: ${fmt}\n" "${@}" 1>&2
+	return 0
+}
+
+dbg()
+{
+	local fmt="${1}"
+	shift 1
+
+	case "${debug}" in '1')
+		printf "DEBUG: ${fmt}\n" "${@}" 1>&2
+	esac
+
+	return 0
+}
+
+get_desktop()
+{
+	local dt=
+
+	dt=$(wmctrl -d | sed -n '/^[0-9][0-9]*  *\* /{ s/  *\* .*$//; p; q; };')
+	case "${dt}" in
+		*[!0-9]*)
+			err 'Failed to get current desktop number'
+			return 1
+			;;
+	esac
+
+	dbg 'Old desktop: %d' ${dt}
+
+	printf '%d' ${dt}
+	return 0
+}
+
+inc_desktop()
+{
+	local dt=${1}
+	local dx=${2}
+	local dy=${3}
+
+	case "${ORIENTATION}" in
+		[Hh]*)
+			x=$((${dt} % ${COLS}))
+			y=$((${dt} / ${COLS}))
+			dbg 'Old coordinates: (%d, %d)' ${x} ${y}
+			x=$(((${x} + ${COLS} + ${dx}) % ${COLS}))
+			y=$(((${y} + ${ROWS} + ${dy}) % ${ROWS}))
+			dbg 'New coordinates: (%d, %d)' ${x} ${y}
+			dt=$((${y} * ${COLS} + ${x}))
+			;;
+		[Vv]*)
+			x=$((${dt} / ${ROWS}))
+			y=$((${dt} % ${ROWS}))
+			x=$(((${x} + ${dx}) % ${COLS}))
+			y=$(((${y} + ${dy}) % ${ROWS}))
+			dt=$((${x} * ${ROWS} + ${y}))
+			;;
+	esac
+
+	printf '%d' ${dt}
+
+	return 0
+}
+
+set_desktop()
+{
+	local dt=${1}
+	shift 1
+
+	dbg 'New desktop: %d' ${dt}
+
+	wmctrl -s ${dt}
+
+	return 0
+}
+
+move_window()
+{
+	local dt=${1}
+	shift 1
+
+	dbg 'New desktop: %d' ${dt}
+
+	wmctrl -r ':ACTIVE:' -t ${dt}
+	wmctrl -s ${dt}
+
+	return 0
+}
+
+usage()
+{
+	printf 'Usage: %s [<options>] <direction>\n' "${0}"
+	printf '\n'
+	printf 'Where <direction> is any word beginning with (in any case):\n'
+	printf '  * "U" for up\n'
+	printf '  * "D" for down\n'
+	printf '  * "L" for left\n'
+	printf '  * "R" for right\n'
+	printf '\n'
+	printf 'Options:\n'
+	printf '  -w  Move the active window\n'
+	printf '  -d  Enable debugging output\n'
+
+	return 0
+}
+
+main()
+{
+	local move_win=
+	local opt=
+	local dir=
+	local dx=
+	local dy=
+	local cur_dt=
+	local new_dt=
+
+	move_win=0
+
+	while getopts 'wd' opt "${@}"; do
+		case "${opt}" in
+			'w') move_win=1;;
+			'd') debug=1;;
+			'?')
+				usage 1>&2
+				return 1
+				;;
+		esac
+	done
+	shift $((${OPTIND} - 1))
+
+	if [ ${#} -ne 1 ]; then
+		usage 1>&2
+		return 1
+	fi
+
+	dir="${1}"
+	shift 1
+
+	case "${dir}" in
+		[Uu]*) dx=0  dy=-1;;
+		[Dd]*) dx=0  dy=1 ;;
+		[Ll]*) dx=-1 dy=0 ;;
+		[Rr]*) dx=1  dy=0 ;;
+		*)
+			usage 1>&2
+			return 1
+			;;
+	esac
+
+	cur_dt=$(get_desktop) || return 1
+	new_dt=$(inc_desktop ${cur_dt} ${dx} ${dy})
+	case ${move_win} in
+		1) move_window ${new_dt};;
+		0) set_desktop ${new_dt};;
+	esac
+
+	return 0
+}
+
+main "${@}"
--
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