debbackport

#!/usr/bin/env bash

ask() {
  read -r -n1 -p "$1 " ans
  printf '\n'
  [[ ${ans^} == Y* ]]
}

declare pkg="$*"
declare version
declare -a versions
declare builddir='/tmp/backport-build/'

if [[ -z "$pkg" ]]; then
  printf 'nothing to search for\n'
  exit 1
fi

set -e

mapfile -t versions < <(apt-cache showsrc "$pkg" | awk '/^Version/{ print $2 }' | sort -uh)
printf '%s has the following versions available:\n' "$pkg"
PS3="choose a number between 1 and ${#versions[@]}: "
select v in "${versions[@]}"; do
  version="$v";
  break
done

[[ -z $version ]] && exit

builddir+="$pkg"
mkdir -p "$builddir" && cd "$builddir"

sudo apt-get build-dep "$pkg"
apt-get source "${pkg}=${version}"

cd "${pkg}-${version%-*}"

[[ -e debian/rules ]] && ask 'edit debian/rules?' && $EDITOR debian/rules

dpkg-buildpackage -uc -us -tc

sudo dpkg -i ../"${pkg}_${version%-*}"-*.deb