#!/bin/sh

# The MIT License (MIT)
#
# Copyright © 2020-2025 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.


# tip [seconds...] [options...]
#
#
# Top ImProved runs `top` using better default settings, offering
# easier-to-use command-line options. Updates happen every 2 seconds
# by default, unless another number is given; these interval numbers
# can also have decimals.
#
# The options are, available both in single and double-dash versions
#
#   -c      reverse-sort entries by latest sampled CPU use
#   -cpu    reverse-sort entries by latest sampled CPU use
#
#   -h      show this help message
#   -help   show this help message
#
#   -i      sort entries by PID
#   -id     sort entries by PID
#   -pid    sort entries by PID
#
#   -m      reverse-sort entries by latest sampled RSS/RES (memory) use
#   -mem    reverse-sort entries by latest sampled RSS/RES (memory) use
#   -res    reverse-sort entries by latest sampled RSS/RES (memory) use
#   -rss    reverse-sort entries by latest sampled RSS/RES (memory) use
#
#   -shr    reverse-sort entries by latest sampled shared memory use
#
#   -t      reverse-sort entries by running time
#   -time   reverse-sort entries by running time
#
#   -u      sort entries by user
#   -user   sort entries by user
#
#   -v      reverse-sort entries by latest sampled VIRTual memory use
#   -virt   reverse-sort entries by latest sampled VIRTual memory use


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

sort=""
seconds=2
num_regex='^(\.[0-9]+|[1-9]+(\.[0-9]+)?)$'

for arg in "$@"; do
    case "${arg}" in
        --) break;;
        -c|--c|-cpu|--cpu) sort="-o %CPU";;
        -i|--i|-id|--id|-pid|--pid) sort="-o PID";;
        -m|--m|-mem|--mem|-res|--res|-rss|--rss) sort="-o RES";;
        -shr|--shr) sort="-o SHR";;
        -t|--t|-time|--time) sort="-o TIME+";;
        -u|--u|-user|--user) sort="-o USER";;
        -v|--v|-virt|--virt) sort="-o VIRT";;
        *)
            if echo "${arg}" | grep -E -q "${num_regex}"; then
                seconds="${arg}"
            fi
        ;;
    esac
done

# restore previous screen contents when sent an INT signal, which usually
# happens by pressing Ctrl+C
trap 'tput rmcup; exit 130' INT

tput smcup
top -d "${seconds}" ${sort}
code=$?
tput rmcup
exit "${code}"