#!/usr/bin/make -f
#-
# Possible flavourisation in DEB_BUILD_OPTIONS (in addition
# to stock Debian rules):
# - static (use with system libc; default for all others)
# - shared (use with klibc or musl)
# - diet, klibc, musl
# - debug (adds -g3)
# - nopwnam (aids static linkage)
# - nofpu (default with klibc)
# - nommu
# - nolibs (use with system libc; default for all others)
# - noautotools (on systems lacking autotools-dev)
# - noselinux
# The 'nostrip' and 'parallel=n' options are supported as well.
#
# Using a non-system libc disables -O0/-O2 and -g and, if unset,
# sets CC. Cross-compiling also sets CC if unset.
#
# Statically linking violates the Policy requirement of having a
# Built-Using header, but since that is only used in local rebuilds
# and not in the Debian archive, it constitutes no Policy violation.

shellescape='$(subst ','\'',$(1))'
shellexport=$(1)=$(call shellescape,${$(1)})

ifeq (,$(findstring terse,${DEB_BUILD_OPTIONS}))
export DH_VERBOSE=1
export V=1
export VERBOSE=1
endif

USE_LIBC:=
ifneq (,$(findstring diet,${DEB_BUILD_OPTIONS}))
USE_LIBC+=	dietlibc
endif
ifneq (,$(findstring klibc,${DEB_BUILD_OPTIONS}))
USE_LIBC+=	klibc
endif
ifneq (,$(findstring musl,${DEB_BUILD_OPTIONS}))
USE_LIBC+=	musl
endif
ifeq (,$(findstring diet,${DEB_BUILD_OPTIONS})$(findstring klibc,${DEB_BUILD_OPTIONS})$(findstring musl,${DEB_BUILD_OPTIONS}))
USE_LIBC+=	system
endif
ifneq ($(strip ${USE_LIBC}),$(firstword ${USE_LIBC}))
$(error multiple libcs (${USE_LIBC}) found in (${DEB_BUILD_OPTIONS}))
endif
USE_LIBC:=$(strip ${USE_LIBC})

ifeq (${USE_LIBC},system)
USE_SHARED:=1
USE_LIBS:=1
else
USE_SHARED:=0
USE_LIBS:=0
endif

ifneq (,$(findstring shared,${DEB_BUILD_OPTIONS}))
USE_SHARED:=1
endif
ifneq (,$(findstring static,${DEB_BUILD_OPTIONS}))
USE_SHARED:=0
endif

USE_PWNAM:=1
ifneq (,$(findstring nopwnam,${DEB_BUILD_OPTIONS}))
USE_PWNAM:=0
endif

USE_FPU:=1
ifneq (,$(findstring nofpu,${DEB_BUILD_OPTIONS}))
USE_FPU:=0
endif

USE_MMU:=1
ifneq (,$(findstring nommu,${DEB_BUILD_OPTIONS}))
USE_MMU:=0
endif

ifneq (,$(findstring nolibs,${DEB_BUILD_OPTIONS}))
USE_LIBS:=0
endif

USE_SELINUX:=1
ifneq (,$(findstring noselinux,${DEB_BUILD_OPTIONS}))
USE_SELINUX:=0
endif
ifeq (0,${USE_LIBS})
USE_SELINUX:=0
endif

DEB_BUILD_ARCH?=$(shell dpkg-architecture -qDEB_BUILD_ARCH)
DEB_BUILD_GNU_TYPE?=$(shell dpkg-architecture -qDEB_BUILD_GNU_TYPE)
DEB_HOST_ARCH?=$(shell dpkg-architecture -qDEB_HOST_ARCH)
DEB_HOST_GNU_TYPE?=$(shell dpkg-architecture -qDEB_HOST_GNU_TYPE)

# is ${CC} defined anywhere (other than implicit rules?)
ifneq (,$(findstring $(origin CC),default undefined))
# no - then default to gcc (or cross-gcc)
ifneq (${DEB_BUILD_ARCH},${DEB_HOST_ARCH})
CC=			${DEB_HOST_GNU_TYPE}-gcc
else
ifeq (${USE_LIBC},dietlibc)
CC=			diet -Os gcc
endif
ifeq (${USE_LIBC},klibc)
CC=			klcc
endif
ifeq (${USE_LIBC},musl)
CC=			musl-gcc
endif
CC?=			gcc
endif
endif

EXTRA_CFLAGS+=		-Wall -Wformat
EXTRA_CFLAGS+=		-fno-omit-frame-pointer -fno-strict-aliasing
ifeq (,$(findstring sarge,${DEB_BUILD_OPTIONS}))
EXTRA_CFLAGS+=		-fwrapv
EXTRA_CFLAGS+=		-Wextra -Wno-pointer-sign
else
EXTRA_CFLAGS+=		-W
endif
EXTRA_CFLAGS+=		-Wno-unused-parameter -Wno-cast-qual
EXTRA_CFLAGS+=		-Wno-strict-prototypes
EXTRA_LDFLAGS=		-Wl,--as-needed

DSF:=			3.0 (quilt)
SUBST_EP:=		-e '/@PRIO@EXTRA@/d'
HOMEPAGE:=		http://www.mirbsd.org/jupp.htm
SUBST_HP:=		-e '/@HP@DOT@/d' -e '/@HP@OLD@/d' -e 's
@HP@MODERN@
${HOMEPAGE}
'
SELINUX_DEP:=		libselinux1-dev [linux-any]
MENU_SUBST:=		cat
USE_MENU:=		0

BREAKS:=		Breaks
SUBST_VARS+=		BREAKS

# buster, sid
DEBHELPER_VERSION:=	11
# stretch
ifneq (,$(findstring stretch,${DEB_BUILD_OPTIONS}))
DEBHELPER_VERSION:=	10
endif
# wheezy, jessie
ifneq (,$(findstring wheezy,${DEB_BUILD_OPTIONS}))
DEBHELPER_VERSION:=	9
USE_MENU:=		1
endif
# lenny, squeeze
ifneq (,$(findstring lenny,${DEB_BUILD_OPTIONS}))
DEBHELPER_VERSION:=	5
USE_MENU:=		1
SELINUX_DEP:=		libselinux1-dev [!kfreebsd-i386 !kfreebsd-amd64 !hurd-i386]
endif
ifneq (,$(findstring lenny,${DEB_BUILD_OPTIONS})$(findstring sarge,${DEB_BUILD_OPTIONS}))
DSF:=			1.0
SUBST_EP:=		-e 's/@PRIO@EXTRA@/Priority: extra/'
BREAKS:=		Conflicts
endif
# sarge, etch (although etch has debhelper 5)
ifneq (,$(findstring sarge,${DEB_BUILD_OPTIONS}))
DEBHELPER_VERSION:=	4
USE_MENU:=		1
SELINUX_DEP:=		libselinux1-dev
SUBST_HP:=		-e '/@HP@MODERN@/d' -e '/^VCS-[gB][ir][to][:w]/d' \
			-e 's/@HP@DOT@//' -e 's
@HP@OLD@
${HOMEPAGE}
'
MENU_SUBST:=		sed 's!"Applications/!"Apps/!'
endif

DSC_DEPS:=		debhelper (>= ${DEBHELPER_VERSION})
SUBST_VARS+=		DSC_DEPS

ifeq (${USE_LIBC},dietlibc)
DSC_DEPS:=		${DSC_DEPS}, dietlibc-dev
USE_SHARED:=0
EXTRA_CFLAGS+=		-fno-stack-protector
endif

ifeq (${USE_LIBC},klibc)
DSC_DEPS:=		${DSC_DEPS}, libklibc-dev
USE_FPU:=0
EXTRA_CFLAGS+=		-fno-stack-protector
ifeq (1,${USE_SHARED})
CC+=			-shared
endif
endif

ifeq (${USE_LIBC},musl)
DSC_DEPS:=		${DSC_DEPS}, musl-tools
EXTRA_CFLAGS+=		-Os
ifeq (0,${USE_SHARED})
EXTRA_LDFLAGS+=		-static
endif
CONFIGURE_ENV+=		ac_cv_header_sys_termios_h=no
endif

ifeq (${USE_LIBC},system)
ifeq (0,${USE_SHARED})
EXTRA_LDFLAGS+=		-static
endif
endif

ifneq (,$(findstring debug,${DEB_BUILD_OPTIONS}))
EXTRA_CFLAGS+=		-g3
endif

ifneq (,$(wildcard /usr/share/dpkg/buildflags.mk))
# dpkg-dev (>= 1.16.1~)
DEB_CFLAGS_MAINT_APPEND=${EXTRA_CFLAGS}
DEB_LDFLAGS_MAINT_APPEND=${EXTRA_LDFLAGS}
ifneq (${USE_LIBC},system)
DEB_CFLAGS_MAINT_STRIP=-O -O0 -O1 -O2 -O3 -Os -Ofast -Og -g -g1 -g2 -g3 -ggdb -gdwarf -gstabs
DEB_CFLAGS_MAINT_STRIP+=-specs=/usr/share/dpkg/no-pie-compile.specs
DEB_LDFLAGS_MAINT_STRIP+=-specs=/usr/share/dpkg/no-pie-link.specs
# do not use PIE with strange libcs
DEB_BUILD_MAINT_OPTIONS=hardening=+all,-pie
else
ifneq (,$(findstring static,${DEB_BUILD_OPTIONS}))
# cannot mix PIE with static linkage
DEB_BUILD_MAINT_OPTIONS=hardening=+all,-pie
else
DEB_BUILD_MAINT_OPTIONS=hardening=+all
endif
endif
include /usr/share/dpkg/buildflags.mk
else
# old-fashioned way to determine build flags
ifneq (${USE_LIBC},system)
CFLAGS=
else
CFLAGS=			-O$(if $(findstring noopt,${DEB_BUILD_OPTIONS}),0,2) -g
endif
CFLAGS+=		${EXTRA_CFLAGS}
LDFLAGS+=		${EXTRA_LDFLAGS}
endif

ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
NUMJOBS=		$(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
MAKEFLAGS+=		-j${NUMJOBS}
endif

CONFIGURE_ARGS=		--build=${DEB_BUILD_GNU_TYPE} \
			--host=${DEB_HOST_GNU_TYPE} \
			--prefix=/usr \
			--sysconfdir=/etc \
			--mandir=/usr/share/man \
			--disable-dependency-tracking

ifeq (0,${USE_PWNAM})
CONFIGURE_ARGS+=	--disable-getpwnam
endif

ifeq (0,${USE_FPU})
CONFIGURE_ARGS+=	--disable-fpu
endif

ifeq (0,${USE_MMU})
CONFIGURE_ARGS+=	--disable-fork
endif

ifeq (0,${USE_LIBS})
CONFIGURE_ARGS+=	--disable-search-libs \
			--disable-terminfo
else
ifneq (11,${DEBHELPER_VERSION})
DSC_DEPS:=		${DSC_DEPS}, libtinfo-dev | libncurses-dev
else
DSC_DEPS:=		${DSC_DEPS}, libncurses-dev
endif
endif

ifeq (1,${USE_SELINUX})
DSC_DEPS:=		${DSC_DEPS}, $(strip ${SELINUX_DEP})
endif

ifeq (,$(findstring noautotools,${DEB_BUILD_OPTIONS}))
ifneq (11,${DEBHELPER_VERSION})
DSC_DEPS:=		${DSC_DEPS}, autotools-dev
endif
endif

CONFIGURE_ARGS+=	--disable-termidx \
			--enable-sysconfjoesubdir=/jupp

debian/.configure_stamp: debian/.control_stamp
	dh_testdir
	-rm -f debian/.*_stamp
	:>debian/.control_stamp # to avoid building twice
	-rm -rf builddir
	# apply autotools-dev if it exists
	for x in config.guess config.sub; do \
		test -e /usr/share/misc/$$x || continue; \
		rm -f $$x; \
		cp /usr/share/misc/$$x .; \
	done
	mkdir builddir
	cd builddir && exec env ${CONFIGURE_ENV} \
	    $(foreach i,CC CFLAGS CPPFLAGS LDFLAGS,$(call shellexport,$i)) \
	    sh ../configure ${CONFIGURE_ARGS}
	@:>$@

debian/.build_stamp: debian/.configure_stamp
	dh_testdir
	cd builddir && exec ${MAKE}
	ln -f builddir/joe builddir/jupp
	ln -f builddir/joe.1 builddir/jupp.1
	@:>$@

debian/.control_stamp:
	@(if test -e debian/control.in; then exit 0; else \
		echo 'dh_testdir: "debian/control.in" not found.' \
		    Are you sure you are in the correct directory\?; \
		exit 1; \
	fi)
	@mkdir -p debian/source
	echo '${DSF}' >debian/source/format
	echo ${DEBHELPER_VERSION} >debian/compat
	-rm -f debian/source.lintian-overrides
ifneq (11,${DEBHELPER_VERSION})
	sed --posix \
	    -e 's! debian-watch-does-not-check-gpg-signature! debian-watch-may-check-gpg-signature!g' \
	    <debian/source/lintian-overrides >debian/source.lintian-overrides
endif
ifneq (,$(findstring 1,${USE_MENU}))
	${MENU_SUBST} <debian/joe-jupp.menu.in >debian/joe-jupp.menu
	${MENU_SUBST} <debian/jupp.menu.in >debian/jupp.menu
endif
	sed ${SUBST_EP} ${SUBST_HP} \
	    $(foreach v,${SUBST_VARS},-e 's
@@'$(call shellescape,$v)'@@
'$(call shellescape,$(strip ${$v}))'
') \
	    <debian/control.in >debian/.gencontrol_stamp
	: bail out if these differ: in those cases,
	: retry the build, after regenerating debian/control
	: with cp debian/.gencontrol_stamp debian/control
	diff -Nu debian/control debian/.gencontrol_stamp
	: you made it, no worries
	@:>$@

debian/control:
	-debian/rules debian/.control_stamp
	cp debian/.gencontrol_stamp debian/control
	-rm -f debian/.control_stamp debian/.gencontrol_stamp

remove/control:
	-rm -f debian/.control_stamp debian/.gencontrol_stamp \
	    debian/source/format debian/compat debian/control \
	    debian/source.lintian-overrides \
	    debian/joe-jupp.menu debian/jupp.menu

build: build-arch build-indep
build-arch: debian/.build_stamp

build-indep: debian/.configure_stamp
	cd builddir && exec ${MAKE} jmacsrc joerc jpicorc jstarrc rjoerc

clean: debian/.control_stamp
	dh_testdir
	-rm -f debian/.*_stamp
	-rm -rf builddir
	# unapply autotools-dev if it exists
	for x in config.guess config.sub; do \
		test -e /usr/share/misc/$$x || continue; \
		rm -f $$x; \
	done
	dh_clean

binary-indep: build-indep
	dh_testdir
	dh_testroot
	if test -x "$$(which dh_prep)"; then dh_prep -i; else dh_clean -i -k; fi
	dh_installchangelogs -i
	dh_install -i
ifneq (,$(findstring 1,${USE_MENU}))
	dh_installmenu -i
else
	dh_install -pjoe-jupp \
	    debian/menu/org.mirbsd.Jupp.jmacs.desktop \
	    debian/menu/org.mirbsd.Jupp.joe.desktop \
	    debian/menu/org.mirbsd.Jupp.jpico.desktop \
	    debian/menu/org.mirbsd.Jupp.jstar.desktop \
	    usr/share/applications/
endif
	# will be replaced by links to jupp
	rm -rf debian/joe-jupp/usr/share/doc/joe-jupp
	dh_link -i
	dh_fixperms -i
	dh_installdeb -i
	dh_gencontrol -i
	dh_md5sums -i
	dh_builddeb -i

# no -Njupp because that's the only arch:any package
binary-arch: build-arch
	dh_testdir
	dh_testroot
	if test -x "$$(which dh_prep)"; then dh_prep -a; else dh_clean -a -k; fi
	dh_installchangelogs -a
	dh_installdocs -a
	dh_install -a
ifneq (,$(findstring 1,${USE_MENU}))
	dh_installmenu -a
else
	dh_install -pjupp \
	    debian/menu/org.mirbsd.Jupp.jupp.desktop \
	    usr/share/applications/
endif
	dh_installman -a
	dh_link -a
	dh_strip -a
	dh_compress -a
	dh_fixperms -a
	dh_installdeb -a
	dh_shlibdeps -a
	dh_gencontrol -a
	dh_md5sums -a
	dh_builddeb -a

binary: binary-arch binary-indep

.PHONY: binary binary-arch binary-indep build build-arch build-indep clean

ifneq (,$(strip ${___DISPLAY_MAKEVARS}))
$(foreach var,${___DISPLAY_MAKEVARS},$(info $(strip ${var})=${$(strip ${var})}))
$(error ___DISPLAY_MAKEVARS finished for ${___DISPLAY_MAKEVARS})
endif

# useful combinations to test:
# DEB_BUILD_OPTIONS= debian/rules debian/.control_stamp
# DEB_BUILD_OPTIONS='diet' debian/rules debian/.control_stamp
# DEB_BUILD_OPTIONS='klibc' debian/rules debian/.control_stamp
# DEB_BUILD_OPTIONS='musl' debian/rules debian/.control_stamp
# DEB_BUILD_OPTIONS='static nopwnam' debian/rules debian/.control_stamp
# DEB_BUILD_OPTIONS='static nopwnam nolibs' debian/rules debian/.control_stamp
# DEB_BUILD_OPTIONS='nommu nolibs' debian/rules debian/.control_stamp
# DEB_BUILD_OPTIONS='nofpu nommu nolibs' debian/rules debian/.control_stamp
# DEB_BUILD_OPTIONS='stretch' debian/rules debian/.control_stamp
# DEB_BUILD_OPTIONS='wheezy' debian/rules debian/.control_stamp
# DEB_BUILD_OPTIONS='lenny' debian/rules debian/.control_stamp
# DEB_BUILD_OPTIONS='lenny diet' debian/rules debian/.control_stamp
# DEB_BUILD_OPTIONS='sarge' debian/rules debian/.control_stamp