arch-reinstall.sh

#!/usr/bin/env bash

error() {
    echo -e "\033[31;1m>>> $1\033[0m"
    exit 1
}

[ -z "$1" ] && error "usage: reinstall.sh <output file from pacman -Qe | pacman -Qeq>"
[ ! -f "$1" ] && error "$1 is not a file"
[ ! $(which sudo 2> /dev/null) ] && error "sudo is missing: install it first as root: pacman -S sudo"

explicit_pkgs=$(cut -d " " -f 1 "$1" | sort)
all_pkgs=$(pacman -Slq | sort)
aur_pkgs=$(comm -23 <(echo "$explicit_pkgs") <(echo "$all_pkgs") )
pac_pkgs=$(comm -13 <(echo "$aur_pkgs") <(echo "$explicit_pkgs") )

echo -e "\n\033[33;1m>>> OFFICIAL PACKAGES:\033[0m\n"
echo "$pac_pkgs" | column -c $(tput cols)
echo -e "\n\033[33;1m>>> AUR PACKAGES:\033[0m\n"
echo "$aur_pkgs" | column -c $(tput cols)
echo -e "\n\033[31;1m>>> INSTALLATION WILL BE UNATTENDED. TYPE \"YES\" TO CONTINUE:\033[0m\n"
read YES
[[ "$YES" != "YES" ]] && exit 1

sudo pacman -S --needed --noconfirm $pac_pkgs

if [ $(which yaourt) ]; then
    yaourt -S --needed --noconfirm $aur_pkgs
else
    $(which curl) || sudo pacman -S --needed --noconfirm --asdeps curl
    curl "https://aur.archlinux.org/packages/pa/package-query/PKGBUILD" > PKGBUILD && makepkg --needed --asdeps -cirs
    curl "https://aur.archlinux.org/packages/ya/yaourt/PKGBUILD" > PKGBUILD && makepkg --needed --asdeps -cirs
    rm PKGBUILD package-query-*.tar.* yaourt-*.tar.*
fi