#!/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.


# psfzf [extra options...] [ps options...] [--...] [fzf options...]
#
# PS + FZF lets you interactively filter a snapshot of all currently running
# processes, by running `ps` and piping it into the interactive picker `fzf`.
#
# The result is a subset of the rows the command `ps` would have given you.
# you can give `fzf` extra options by preceding them with a `--` (no quotes).
#
# Besides the usual `ps`-specific options, this script offers easier-to-use
# extra options
#
#   --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
#
#   --m      reverse-sort entries by latest sampled RSS (memory) use
#   --mem    reverse-sort entries by latest sampled RSS (memory) use
#   --rss    reverse-sort entries by latest sampled RSS (memory) use
#
#   --u      sort/group entries by user
#   --user   sort/group entries by user
#
#   -docker, --docker, docker
#            run `docker ps` instead of `ps`
#
#   --pm, -podman, -podman, --podman, podman
#            run `podman ps` instead of `ps`


fetch='ps'

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

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

        --c|--cpu)
            sort="--sort=-%cpu,-rss"
            shift
            continue
        ;;

        --i|--id|--pid)
            sort="--sort=pid"
            shift
            continue
        ;;

        --m|--mem|--rss)
            sort="--sort=-rss,-%cpu"
            shift
            continue
        ;;

        --u|--user)
            sort="--sort=user,-%cpu,-rss"
            shift
            continue
        ;;

        -docker|--docker|docker)
            fetch="docker ${fetch}"
            shift
            continue
        ;;

        --p|--pm|-podman|--podman|podman)
            fetch="podman ${fetch}"
            shift
            continue
        ;;

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

    fetch="${fetch} $1"
    shift
done

if [ "${fetch}" = 'ps' ]; then
    fetch='ps aux'
fi

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

keys='ctrl-a:select-all,ctrl-space:toggle'
pick="fzf --reverse -m --header-first --bind ${keys}"
header="$(echo "${data}" | awk 'NR == 1 { print; exit }')"
data="$(echo "${data}" | awk 'NR > 1 && /[^ ]/')"

data="$(echo "${data}" | ${pick} --header="${header}" "$@")"
res=$?
if [ "${res}" -ne 0 ]; then
    exit "${res}"
fi

printf "%s\n" "${header}"
echo "${data}" | awk '/[^ ]/'