#!/bin/sh

set -eu

# Examples:
# * debian/control.in
# * debian/control-in
CONTROL=${1:-debian/control}

# Examples:
# * ^:debian:
# * '^(?::debian:)?'
PREFIX=${2:-^}

SUITE=byzantium
GIT_AREA=${GIT_AREA:-pureos/packages}

GBP_CONF=debian/gbp.conf

perl -i -pe 's/'$PREFIX'Maintainer:\K/ PureOS Maintainers <pureos-project\@lists.puri.sm>\nXSBC-Original-Maintainer:/' "$CONTROL"
git commit -m "fork for PureOS: set PureOS Maintainers as maintainer, leaving original as XSBC-Original-Maintainer" "$CONTROL"
if grep -q "${PREFIX}Uploaders:" "$CONTROL"; then
	perl -i -0777 -pe 's/'$PREFIX'Uploaders:.*(?:\n\h.*)*\n//m' "$CONTROL"
	git commit -m "fork for PureOS: drop uploaders (unused by PureOS Maintainers)" "$CONTROL" || true
fi
perl -i -0777 -pe 's/'$PREFIX'Vcs-([^ :]+:).*(?:\n\h.*)*\n//gm' "$CONTROL"
URL="https://source.puri.sm/$GIT_AREA/$(basename $(pwd))" perl -i -0777 -pe 's,\n\n,\nVcs-Git: $ENV{URL}.git\nVcs-Browser: $ENV{URL}\n\n,m' "$CONTROL"
git commit -m "fork for PureOS: replace Vcs-* fields" "$CONTROL"
if [ -f "$GBP_CONF" ]; then
	if grep -q "^debian-branch" "$GBP_CONF"; then
		perl -i -pe "s,^debian-branch\s*=\s*\K.*,pureos/\Q$SUITE\E," "$GBP_CONF"
		git commit -m "fork for PureOS: adapt git-buildpackage debian-branch" "$GBP_CONF"
	elif grep -q '^\[DEFAULT\]' "$GBP_CONF"; then
		perl -i -0777 -pe "s,^\[DEFAULT\]\h*\K,\ndebian-branch = pureos/\Q$SUITE\E,m" "$GBP_CONF"
		git commit -m "fork for PureOS: add git-buildpackage setting debian-branch" "$GBP_CONF"
	else
		echo 'ERROR: failed to add debian-branch to git-buildpackage config'
		exit 1
	fi
else
	cat <<EOF > "$GBP_CONF"
# Configuration file for git-buildpackage and friends

[DEFAULT]
pristine-tar = True
sign-tags = True
filter = */.git*
debian-branch = pureos/$SUITE
EOF
	git add "$GBP_CONF"
	git commit -m "fork for PureOS: add git-buildpackage config" "$GBP_CONF"
fi