#! /bin/bash
#----------------------------------------------------------------------
# Description: script for rpm uninstallation within all installed rpms
#
# Author:  Artem S. Tashkinov
# Created at:
#             Mon Nov 21 20:12:04 2016 - dnf, show deps, no clear
#             Wed Dec 13 19:43:00 2017 - remove by mask, skip already deleted, skip protected
#             Fri May 11 18:52:51 2018 - skip packages with errors instead of waithing for the user input
#                                            stop background dependancy checking
#                                            set env var SKIP to skip up to a certain package
#
# Copyright (c) 2004 Artem S. Tashkinov. All rights reserved.
#----------------------------------------------------------------------

#set -x
dont_remove="|AdobeReader_enu|Thunar|icewm|hexchat|xterm|xfce4|qbittorrent|mkvtoolnix|rpm-build|wireshark|samba|libxml2-devel|libvorbis|libogg|alsa|lxdm|xfdesktop|openssh|vpx|google-chrome|mesa-lib|libxslt|openssl|pulseaudio-libs|electrum|firewall"

clear

resolve()
{
	name=`rpm -q --queryformat "%{NAME}" "$1"`
	result=`dnf -C --setopt=clean_requirements_on_remove=False --assumeno remove "$1" 2>&1` # | grep -v "Operation aborted."`
	protect=`echo "$result" | egrep "protected packages$dont_remove"`
	if [ -z "$protect" ]; then
		myself=`echo "$result" | grep -vw "$name" | awk '/@/{print $1"-"$3"."$2}'` # awk: don't print the package itself as a dependancy: if (index("'"$1"'",$1)) next;
		if [ -z "$myself" ]; then
			echo "[OK]: no dependencies found."
		else
			echo -n "[WARN]: Dependent on $1: "
			echo "$result" | grep -vw "$name" | awk 'BEGIN{ORS=", "}/@/{print $1}' | sed 's/, $/\n/'
		fi
		echo -n "Remove (n)? "
	else
		echo -e "[ERROR]:\n$protect"
		return 1
	fi
}

some="."
test -n "$1" && some="$1"

for i in `rpm -qa | sort | grep "$some"`; do
	[[ "$i" < "$SKIP" ]] && continue
#	clear
	if rpm -qi "$i"; then
		if resolve "$i"; then # &
			read answer
			if [ "$answer" == "Y" -o "$answer" == "y" ]; then
				dnf -C remove "$i"
			fi
		else
			echo "[ERROR]: skipping a protected package"
		fi
	else
		echo "[WARNING]: Package "$i" has already been removed"
	fi
	echo "________________________________________________________________"
done