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luxsh: added left paren, replaced some tests with case. #9

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luxsh: added left paren, replaced some tests with case. #9

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aeb2fed
Update lux.sh
Oct 26, 2020
c84a0b8
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Dec 7, 2020
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81 changes: 44 additions & 37 deletions lux.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,8 @@
# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
usage() {
echo 'Usage: lux OPERATION [-c CONTROLLER_NAME] [-m MIN] [-M MAX]
cat <<-'USAGE'
Usage: lux OPERATION [-c CONTROLLER_NAME] [-m MIN] [-M MAX]

Brightness option values are positive integers.
Percent mode, add "%" after values (operation options only).
Expand Down Expand Up @@ -49,72 +50,79 @@ Controllers:
-c CONTROLLER_NAME
Set the controller to use.
Use any CONTROLLER_NAME in /sys/class/backlight.
'
USAGE
}

version() {
echo 'Lux 1.21
cat <<-'VERSION'
Lux 1.21
Copyright (C) 2020 Thomas "Ventto" Venriès.

License MIT
<https://opensource.org/licenses/MIT>.
'
VERSION
}

no_conjunction() {
while [ "$#" -ne 0 ]; do $1 && return 1; shift; done
while :; do
case "$#" in (0) break; esac
$1 && return 1
shift
done
}

arg_err() {
usage; exit 2
}

is_positive_int() {
echo "${1}" | grep -E '^[0-9]+$' >/dev/null 2>&1 || return 1
case "$1" in (''|*[!0-9]*) return 1; esac
return 0
}

is_percentage() {
echo "${1}" | grep -E '%$' >/dev/null 2>&1 || return 1
case "$1" in (*'%') return 0; esac
return 1
}

check_perm() {
_ctrl="${1}"
udev_rule="/etc/udev/rules.d/99-lux.rules"

if [ ! -w "${_ctrl}/brightness" ] ; then
if [ "$(id -u)" -ne 0 ]; then
case "$(id -u)" in (0) :;; (*)
if ! id -nG "${USER}" | grep video >/dev/null 2>&1; then
echo "Use sudo once to setup group permissions,"
echo "to access to controller's brightness from user."
else
echo "To setup the group permissions permanently, you need to logout/login."
fi
exit
fi
esac
fi

if [ "$(id -u)" -eq 0 ]; then
case "$(id -u)" in (0)
if ! cut -d: -f1 /etc/group | grep video >/dev/null 2>&1; then
echo "Group ~video~ does not exist."
exit 1
fi

if [ -z "$(find "${_ctrl}" -name 'brightness' -group video)" ]; then
case "$(find "${_ctrl}" -name 'brightness' -group video)" in ('')
if [ ! -f "${udev_rule}" ] ; then
echo "${udev_rule}: missing file."
exit 1
fi
udevadm control -R
udevadm trigger -c add -s backlight
fi
esac

if ! id -nG "${SUDO_USER}" | grep video >/dev/null 2>&1; then
usermod -a -G video "${SUDO_USER}"
echo "User has been added to ~video~ group."
echo "To setup the group permissions permanently, you need to logout/login."
exit
fi
fi
esac
}

main() {
Expand All @@ -129,58 +137,58 @@ main() {

while getopts 'hvgGm:M:c:a:s:S:' opt; do
case $opt in
h) usage ; exit;;
v) version; exit;;
g|G) ! no_conjunction "${sFlag}" "${SFlag}" "${aFlag}" && arg_err
[ "$opt" = 'G' ] && percent_mode=true
(h) usage ; exit;;
(v) version; exit;;
(g|G) ! no_conjunction "${sFlag}" "${SFlag}" "${aFlag}" && arg_err
case "$opt" in ('G') percent_mode=true; esac
gFlag=true
;;
m) ! is_positive_int "$OPTARG" && arg_err
(m) ! is_positive_int "$OPTARG" && arg_err
mFlag=true
mArg="$OPTARG"
;;
M) ! is_positive_int "$OPTARG" && arg_err
MFlag=true
MArg="$OPTARG"
;;
c) controller_path="/sys/class/backlight/$OPTARG"
(c) controller_path="/sys/class/backlight/$OPTARG"
if [ ! -d "${controller_path}" ] ; then
echo "${controller_path}: controller not found."
exit
fi
[ "$#" -eq 2 ] && arg_err
case "$#" in (2) arg_err; esac
cFlag=true
cArg="${controller_path}"
;;
a) ! no_conjunction "${sFlag}" "${SFlag}" "${gFlag}" && arg_err
(a) ! no_conjunction "${sFlag}" "${SFlag}" "${gFlag}" && arg_err
if is_percentage "$OPTARG"; then
percent_mode=true
OPTARG=$(echo "$OPTARG" | cut -d'%' -f1)
OPTARG="${OPTARG%%'%'*}"
fi
! is_positive_int "$OPTARG" && arg_err
aFlag=true
valArg="$OPTARG"
;;
s) ! no_conjunction "${aFlag}" "${SFlag}" "${gFlag}" && arg_err
(s) ! no_conjunction "${aFlag}" "${SFlag}" "${gFlag}" && arg_err
if is_percentage "$OPTARG"; then
percent_mode=true
OPTARG=$(echo "$OPTARG" | cut -d'%' -f1)
OPTARG="${OPTARG%%'%'*}"
fi
! is_positive_int "$OPTARG" && arg_err
sFlag=true
valArg="$OPTARG"
;;
S) ! no_conjunction "${aFlag}" "${sFlag}" "${gFlag}" && arg_err
(S) ! no_conjunction "${aFlag}" "${sFlag}" "${gFlag}" && arg_err
if is_percentage "$OPTARG"; then
percent_mode=true
OPTARG=$(echo "$OPTARG" | cut -d'%' -f1)
OPTARG="${OPTARG%%'%'*}"
fi
! is_positive_int "$OPTARG" && arg_err
SFlag=true
valArg="$OPTARG"
;;
\?) usage; exit 2;;
:) usage; exit 2;;
(\?)usage; exit 2;;
(:) usage; exit 2;;
esac
done

Expand All @@ -200,10 +208,10 @@ main() {
best_controller="${ctrl}"
fi
done
if [ -z "${best_controller}" ]; then
case "${best_controller}" in ('')
echo "No backlight controller detected"
exit
fi
esac
fi

check_perm "${best_controller}"
Expand All @@ -213,10 +221,10 @@ main() {
best_max=$((best_max - 1))

# Display controller information if no argument
if [ "$#" -eq 0 ] ; then
case "$#" in (0)
echo "${best_controller} 0;${brightness};${best_max}"
exit
fi
esac

if ${gFlag}; then
${percent_mode} && { echo "$((brightness * 100 / best_max))%"; exit; }
Expand All @@ -226,7 +234,7 @@ main() {

if ${SFlag} ; then
${percent_mode} && valArg=$(( best_max * valArg / 100 ))
[ "$valArg" -lt 0 ] && valArg=0
case "$valArg" in (-*) valArg=0; esac
[ "$valArg" -gt "$best_max" ] && valArg="${best_max}"
echo "${valArg}" | tee "${file}"
exit
Expand All @@ -235,10 +243,9 @@ main() {
${mFlag} && own_min="${mArg}" || own_min=0
${MFlag} && own_max="${MArg}" || own_max="${best_max}"

if [ $(( own_max - own_min )) -le 0 ] || \
[ $(( own_max - own_min )) -gt "${best_max}" ] ; then
arg_err
fi
case $(( own_max - own_min )) in ([1-9]*)
[ $(( own_max - own_min )) -gt "${best_max}" ] && arg_err
esac

[ "$brightness" -lt "$own_min" ] && brightness="${own_min}"
[ "$brightness" -gt "$own_max" ] && brightness="${own_max}"
Expand Down