#!/bin/bash -e

package=0

while read -r line; do
    if [[ $line != */vmlinuz ]]; then
        # triggers when it's a change to usr/lib/initcpio/*
        package=1
        continue
    fi

    if ! read -r pkgbase > /dev/null 2>&1 < "${line%/vmlinuz}/pkgbase"; then
        # if the kernel has no pkgbase, we skip it
        continue
    fi

    # remove the actual kernel and images for the package being removed
    kernel="/boot/vmlinuz-${pkgbase}"
    preset="/etc/mkinitcpio.d/${pkgbase}.preset"
    initramfs="/boot/initramfs-${pkgbase}.img"
    fallback_initramfs="/boot/initramfs-${pkgbase}-fallback.img"
    if [[ -e $kernel ]]; then
        # remove the installed kernel
        rm $kernel
    fi
    if [[ -e $preset ]]; then
        # remove the preset
        rm $preset
    fi
    if [[ -e $initramfs && -e $fallback_initramfs ]]; then
        # remove the images
        rm $initramfs $fallback_initramfs
    fi
done

if (( package )) && compgen -G /etc/mkinitcpio.d/"*.preset" > /dev/null; then
    # remove all presets
    rm /etc/mkinitcpio.d/*.preset
fi