# Automate APT pinning for Debian distributons
# Copyright (C) 2015 Rafael Laboissière
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation, either version 3 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program.  If not, see <http://www.gnu.org/licenses/>.

SHELL = /bin/bash
APT_DIR = /etc/apt
PREFS_FILE = preferences.d/debian-releases
SRC_DIR = sources.list.d

DEFAULT_MIRROR = ftp.us.debian.org
MIRROR =

DEFAULT_ORDER = stable testing unstable experimental
ORDER =

MANIFEST = .installed-files

.PHONY: install
install:
	@if [ -z "$(MIRROR)" ] ; then					\
		echo -n "Debian mirror [$(DEFAULT_MIRROR)]: " ;		\
		read mirror ;						\
		if [ -z "$$mirror" ] ; then				\
			mirror=$(DEFAULT_MIRROR) ;			\
		fi ;							\
	else								\
		mirror=$(MIRROR) ;					\
	fi ;	 							\
	if [ -z "$(ORDER)" ] ; then					\
		echo -n "Priority order [$(DEFAULT_ORDER)]: " ;		\
		read order ;						\
		if [ -z "$$order" ] ; then				\
			order=($(DEFAULT_ORDER)) ;			\
		fi ;							\
	else								\
		order=($(ORDER)) ;					\
	fi ;	 							\
	echo "Installing preferences file..." ;				\
	prefs=$(APT_DIR)/$(PREFS_FILE) ;				\
	rm -f $$prefs ;							\
	echo $$prefs > $(MANIFEST) ;					\
	priority=1000 ;							\
	for i in $$( seq 0 $$(( $${#order[*]} - 1)) ) ; do		\
		echo "Package: *" >> $$prefs ;				\
		echo "Pin: release a=$${order[$$i]}" >> $$prefs ;	\
		echo "Pin-Priority: $$priority" >> $$prefs ;		\
		echo "" >> $$prefs ;					\
		priority=$$(( $$priority - 100 )) ;			\
	done ;								\
	echo "Installing source files..." ;				\
	srcdir=$(APT_DIR)/$(SRC_DIR) ;					\
	for d in $${order[*]} ; do					\
		f=$$srcdir/debian-$$d.list ;				\
		rm -f $$f ;						\
		echo $$f >> $(MANIFEST) ;				\
		for t in deb deb-src ; do				\
			echo -n "$$t http://$$mirror/debian/" >> $$f ;	\
			echo " $$d main contrib non-free" >> $$f ;	\
		done ;							\
	done
	aptitude update

.PHONY: uninstall
uninstall:
	[ -f $(MANIFEST) ] && rm -f $$(cat $(MANIFEST))

.PHONY: doc
doc:
	[ -n "$$(which markdown_py)" -a -n "$$(which w3m)" ]		\
	&& markdown_py README.md -x fenced_code | w3m -T text/html	\
	|| cat README.md