#!/bin/sh

VERSION=$(dpkg-parsechangelog | sed -n -e '/^Version:/s/^Version: //p')
DISTRIBUTION=$(dpkg-parsechangelog | sed -n -e '/^Distribution:/s/^Distribution: //p')

LIBAPTPKGVERSION="$(awk -v ORS='.' '/^\#define APT_PKG_M/ {print $3}' apt-pkg/init.h | sed 's/\.$//')"
LIBAPTINSTVERSION="$(egrep '^MAJOR=' apt-inst/makefile |cut -d '=' -f 2)"

if [ "$1" = 'pre-export' ]; then
	libraryversioncheck() {
		LIBRARY="$1"
		VERSION="$2"
		if [ ! -e "debian/${LIBRARY}${VERSION}.symbols" ]; then
		   echo >&2 "Library ${LIBRARY} in version ${VERSION} has no symbols file! (maybe forgot to rename?)"
		   exit 1
		fi
		if [ "$(head -n1 "debian/${LIBRARY}${VERSION}.symbols")" != "${LIBRARY}.so.${VERSION} ${LIBRARY}${VERSION} #MINVER#" ]; then
		   echo >&2 "Library ${LIBRARY}${VERSION} has incorrect version in symbol header! (»$(head -n1 "debian/${LIBRARY}${VERSION}.symbols")«)"
		   exit 2
		fi
	}

	libraryversioncheck 'libapt-pkg' "$LIBAPTPKGVERSION"
	libraryversioncheck 'libapt-inst' "$LIBAPTINSTVERSION"


	if [ "$DISTRIBUTION" = 'sid' ]; then
		echo >&2 '»sid« is not a valid distribution. Replace it with »unstable« for you'
		sed -i -e 's/) sid; urgency=/) unstable; urgency=/' debian/changelog
		DISTRIBUTION='unstable'
	elif [ "$DISTRIBUTION" = 'UNRELEASED' ]; then
		echo >&2 'WARNING: Remember to change to a valid distribution for release'
		VERSION="$VERSION~$(date +%Y%m%d)"
	fi

	if [ "$(date +%Y-%m-%d)" != "$(grep --max-count=1 '^"POT-Creation-Date: .*\n"$' po/apt-all.pot | cut -d' ' -f 2)" -o \
	     "$(date +%Y-%m-%d)" != "$(grep --max-count=1 '^"POT-Creation-Date: .*\n"$' doc/po/apt-doc.pot | cut -d' ' -f 2)" ]; then
		echo >&2 'POT files are not up-to-date. Execute »make update-po« for you…'
		make update-po
	fi

	sed -i -e "s/^PACKAGE_VERSION=\".*\"$/PACKAGE_VERSION=\"${VERSION}\"/" configure.in
elif [ "$1" = 'post-build' ]; then
	if [ "$DISTRIBUTION" != "UNRELEASED" ]; then
		echo >&2 "REMEMBER: Tag this release with »bzr tag ${VERSION}« if you are satisfied"
	else
		echo >&2 'REMEMBER: Change to a valid distribution before release'
	fi
elif [ "$1" = 'library' ]; then
	librarysymbols() {
		echo "Checking $1 in version $2"
		tmpfile=$(mktemp)
		dpkg-gensymbols -p${1}${2} -ebuild/bin/${1}.so.${2} -Idebian/${1}${2}.symbols -O/dev/null 2> /dev/null > $tmpfile
		echo '=== Missing symbols:'
		grep '^+#MISSING' $tmpfile
		echo '=== New symbols:'
		grep '^+ ' $tmpfile | cut -d' ' -f 2 | cut -d'@' -f 1 | c++filt | while read line; do
			echo " (c++)\"${line}@Base\" $VERSION"
		done | sort -u
		rm $tmpfile
	}
	librarysymbols 'libapt-pkg' "${LIBAPTPKGVERSION}"
	echo
	librarysymbols 'libapt-inst' "${LIBAPTINSTVERSION}"
else
	echo >&1 "Usage:\t$0 pre-export
\t$0 post-build
\t$0 library

If you use »bzr builddeb« you can leave this script alone as it will
be run at the right places auto-magically. Otherwise you should use
»pre-export« to update po and pot files as well as version numbering.
»post-build« can be used to run some more or less useful checks later on.

»library« isn't run automatically but can be useful for maintaining the
(more or less experimental) symbols files we provide"
fi