#!/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.


# ambush [extra options...] [kill options...] [--...] [fzf options...]
#
# Find and kill running processes which were currently running at the start of
# this tool, picking via `fzf` live-picker. If any items are picked/confirmed,
# these are given to the `kill` command.
#
# The extra options are, available both in single and double-dash versions
#
#   -h, -help    show this help message


commando='kill'

while [ $# -gt 0 ]; do
    if [ "$1" = "--" ]; then
        shift
        break
    fi

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

        -*)
            commando="${commando} $1"
            shift
            continue
        ;;
    esac

    break
done

data="$(ps aux)"
res=$?
if [ "${res}" -ne 0 ]; then
    exit "${res}"
fi

# msg="Pick Processes for command "${commando}" ..."
msg='Pick Processes to kill: tab toggles, enter confirms, escape safe-quits'
pick='fzf --reverse -m --header-first --header-lines=1'
targets="$(echo "${data}" | ${pick} --header="${msg}")"
res=$?
if [ "${res}" -ne 0 ]; then
    exit "${res}"
fi

if [ -n "${targets}" ]; then
    echo "${targets}" \
    | awk -v ORS='\000' '/[^ ]/ { print ($2 + 0 != 0) ? $2 : $1 }' \
    | xargs -0 ${commando}
fi