#!/bin/sh

# The MIT License (MIT)
#
# Copyright (c) 2026 pacman64
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER 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.


# toplus [seconds...] [options...]
#
# Run `top` using better default settings. Unlike running `top`, this tool
# avoids leaving any output on the screen once done. Updates happen every 2
# seconds by default, unless you change it by giving an argument which looks
# like a number, without decimals.
#
# As when running `top` directly, pressing `q` quits. You can also force-quit
# this tool by pressing Ctrl+C.
#
# The options are, available both in single and double-dash versions
#
#   -h, -help    show this help message


# This version is compatible with busybox/alpine-linux.

case "$1" in
    -h|--h|-help|--help)
        awk '/^# +toplus /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
        exit 0
    ;;
esac

seconds=2
if echo "$1" | grep -E -q '^[0-9]+$'; then
    seconds="$1"
    shift
fi

# restore previous screen contents when sent a SIGINT signal, which usually
# happens by pressing Ctrl+C
trap 'printf "\e[?1049l\e[23;0;0t"; exit 130' INT

printf "\e[?1049h\e[22;0;0t"
top -d "${seconds}" "$@"
code=$?
printf "\e[?1049l\e[23;0;0t"
exit "${code}"