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|
#!/bin/sh
set -eu
# Default values, overridden in ~/.chdtrc
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 "${dir}" in
[Uu]*) dx=0 dy=-1;;
[Dd]*) dx=0 dy=1 ;;
[Ll]*) dx=-1 dy=0 ;;
[Rr]*) dx=1 dy=0 ;;
*)
usage 1>&2
return 1
;;
esac
# POSIX on the dot utility:
# "If no readable file is found, a non-interactive shell shall abort"
# So to survive an ENOENT or other error, we need this eval/cat command.
eval "$(cat ~/.chdtrc 2>/dev/null || :)"
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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