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#!/bin/sh

set -e

usage () {
	echo "$0 PKG-NAME bin-name-1 [ bin-name-2 ...]"
	exit 1
}

if [ $# -lt 2 ] ; then
	usage
fi

PKG_NAME=${1}
PKG_PY2=python-${1}
PKG_PY3=python3-${1}
shift

# postinst
echo "#!/bin/sh

set -e

if [ \"\$1\" = \"configure\" ] ; then" >debian/$PKG_PY2.postinst
cp debian/$PKG_PY2.postinst debian/$PKG_PY3.postinst

# postrm
echo "#!/bin/sh

set -e

if [ \"\$1\" = \"remove\" ] || [ \"\$1\" = \"disappear\" ] ; then" >debian/$PKG_PY2.postrm
cp debian/$PKG_PY2.postrm debian/$PKG_PY3.postrm

# postrm
echo "#!/bin/sh

set -e

if [ \"\$1\" = \"remove\" ] ; then" >debian/$PKG_PY2.prerm
cp debian/$PKG_PY2.prerm debian/$PKG_PY3.prerm

RULES_ENTRY=""

while [ -n "${1}" ] ; do
	BIN_UTIL_NAME=$1
	shift
	echo "	update-alternatives --install /usr/bin/${BIN_UTIL_NAME} ${BIN_UTIL_NAME} /usr/bin/python2-${BIN_UTIL_NAME} 300" >>debian/$PKG_PY2.postinst
	echo "	update-alternatives --install /usr/bin/${BIN_UTIL_NAME} ${BIN_UTIL_NAME} /usr/bin/python3-${BIN_UTIL_NAME} 200" >>debian/$PKG_PY3.postinst
	echo "	update-alternatives --remove ${BIN_UTIL_NAME} /usr/bin/python2-${BIN_UTIL_NAME}" >>debian/$PKG_PY2.postrm
	echo "	update-alternatives --remove ${BIN_UTIL_NAME} /usr/bin/python3-${BIN_UTIL_NAME}" >>debian/$PKG_PY3.postrm
	echo "	update-alternatives --remove ${BIN_UTIL_NAME} /usr/bin/python2-${BIN_UTIL_NAME}" >>debian/$PKG_PY2.prerm
	echo "	update-alternatives --remove ${BIN_UTIL_NAME} /usr/bin/python3-${BIN_UTIL_NAME}" >>debian/$PKG_PY3.prerm
	RULES_ENTRY="${RULES_ENTRY}\n\tmv \$(CURDIR)/debian/${PKG_PY2}/usr/bin/${BIN_UTIL_NAME} \$(CURDIR)/debian/${PKG_PY2}/usr/bin/python2-${BIN_UTIL_NAME}"
	RULES_ENTRY="${RULES_ENTRY}\n\tmv \$(CURDIR)/debian/${PKG_PY3}/usr/bin/${BIN_UTIL_NAME} \$(CURDIR)/debian/${PKG_PY3}/usr/bin/python3-${BIN_UTIL_NAME}"
done

for i in postinst prerm postrm ; do
	echo "fi

#DEBHELPER#

exit 0">>debian/$PKG_PY2.$i
	echo "fi

#DEBHELPER#

exit 0">>debian/$PKG_PY3.$i
done

echo "I created the below maintainer scripts for you:
- debian/$PKG_PY2.postinst
- debian/$PKG_PY3.postinst
- debian/$PKG_PY2.postrm
- debian/$PKG_PY3.postrm
- debian/$PKG_PY2.prerm
- debian/$PKG_PY3.prerm

Please make sure to insert this in your debian/rules:
${RULES_ENTRY}
"
exit 0