#!/bin/bash

set -e

PACKAGE="$(dpkg-parsechangelog | sed 's/^Source: //; t; d')"
test -n "$PACKAGE"

# Get the main upstream tarball URL and version via uscan.
while read line; do
    if [ "${line#http://}" != "$line" -a "${line#* }" = "$line" ]; then
	main_url="${line}"
    fi
    if [ "${line#Newest version }" != "$line" ]; then
	version="${line#Newest version on remote site is }"
	version="${version%, local version is *}"
    fi
done < <(LANG=C uscan --report --verbose)
test -n "$main_url" -a -n "$version"

# Get the document tarball URL and the filenames of the tarballs.
# Download them.
main_file=${main_url##*/}
doc_url=${main_url/ion/ion-doc}
doc_file=${doc_url##*/}
wget -O $main_file $main_url
wget -O $doc_file $doc_url

# Work out what directories we expect to be in them, and check this.
main_dir=${main_file%.tar.gz}
doc_dir=${doc_file%.tar.gz}
test -z "$(tar tzf $main_file | grep -v "^$main_dir/")"
test -z "$(tar tzf $doc_file | grep -v "^$doc_dir/")"

# Unpack, combine and repack.
tar xzf $main_file
tar xzf $doc_file
mv $main_dir $PACKAGE-$version.orig
mv $doc_dir $PACKAGE-$version.orig/doc
tar cf - $PACKAGE-$version.orig | gzip -c9 > $PACKAGE_$version.orig.tar.gz

# Clean up.
rm -rf $main_file $doc_file $PACKAGE-$version.orig