#!/bin/bash

set -eu

PKGNAME="$1"
if [ -z "$PKGNAME" ]; then
    echo "Usage: $0 pkgname"
    exit 1
fi

shift
MAKEPKG_CMD=("$@")
if [ ${#MAKEPKG_CMD[@]} -eq 0 ]; then
    MAKEPKG_CMD=("makepkg" "-sr")
fi

function enter_directory {
    mkdir -p "$1"
    cd "$1"
}

function fetch_latest_changes {
    if [ ! -d .git ]; then
        git init
        git remote add origin "https://aur.archlinux.org/${PKGNAME}"
    fi
    git fetch
    git reset origin/master
}

function show_diff {
    git diff -R
}

function ask_user_to_continue {
    read -r -p "Ok? (y/n) " ok
    if [ "$ok" != "y" ]; then
        return 1
    fi
}

function build_and_install {
    git checkout .
    "${MAKEPKG_CMD[@]}"
}

enter_directory "/var/abs/${PKGNAME}"
fetch_latest_changes
show_diff
ask_user_to_continue
build_and_install