# $Id: bsd.after-import.mk,v 1.3 2017/08/15 15:54:06 brook Exp $

# This makefile is for use when integrating bmake into a BSD build
# system.  Use this makefile after importing bmake.
# It will bootstrap the new version,
# capture the generated files we need, and add an after-import
# target to allow the process to be easily repeated.

# The goal is to allow the benefits of autoconf without
# the overhead of running configure.

all: _makefile
all: after-import

# we rely on bmake
.if !defined(.PARSEDIR)
.error this makefile requires bmake
.endif

_this := ${MAKEFILE:tA} 
BMAKE_SRC := ${.PARSEDIR}

# it helps to know where the top of the tree is.
.if !defined(SRCTOP)
srctop := ${.MAKE.MAKEFILES:M*src/share/mk/sys.mk:H:H:H}
.if empty(srctop)
# likely locations?
.for d in contrib/bmake external/bsd/bmake/dist
.if ${BMAKE_SRC:M*/$d} != ""
srctop := ${BMAKE_SRC:tA:S,/$d,,}
.endif
.endfor
.endif
.if !empty(srctop)
SRCTOP := ${srctop}
.endif
.endif

# This lets us match what boot-strap does
.if !defined(HOST_OS)
HOST_OS!= uname
.endif

BOOTSTRAP_ARGS = \
	--prefix /usr \
	--share /usr/share

.if !empty(DEFAULT_SYS_PATH)
BOOTSTRAP_ARGS += --with-default-sys-path='${DEFAULT_SYS_PATH}'
.endif

# run boot-strap with minimal influence
bootstrap:	${BMAKE_SRC}/boot-strap ${MAKEFILE}
	HOME=/ ${BMAKE_SRC}/boot-strap -o ${HOST_OS} ${BOOTSTRAP_ARGS} ${BOOTSTRAP_XTRAS}
	touch ${.TARGET}

# Makefiles need a little more tweaking than say config.h
MAKEFILE_SED = 	sed -e '/^MACHINE/d' \
	-e '/include.*VERSION/d' \
	-e '/^PROG/ { s,=,?=,;s,bmake,$${.CURDIR:T},; }' \
	-e 's,^.-include,.sinclude,' \
	-e '/^\..*include  *</ { s,<,<bsd.,;/autoconf/d; }' \
	-e 's,${SRCTOP},$${SRCTOP},g'

# These are the simple files we want to capture
configured_files= config.h Makefile.config unit-tests/Makefile

after-import: bootstrap ${MAKEFILE}
.for f in ${configured_files:M*.[ch]}
	@echo Capturing $f
	@mkdir -p ${${.CURDIR}/$f:L:H}
	@(echo '/* $$${HOST_OS}$$ */'; cat ${HOST_OS}/$f) > ${.CURDIR}/$f
.endfor
.for f in ${configured_files:M*Makefile*}
	@echo Capturing $f
	@mkdir -p ${${.CURDIR}/$f:L:H}
	@(echo '# This is a generated file, do NOT edit!'; \
	echo '# See ${_this:S,${SRCTOP}/,,}'; \
	echo '#'; echo '# $$${HOST_OS}$$'; echo; \
	echo 'SRCTOP?= $${.CURDIR:${${.CURDIR}/$f:L:H:S,${SRCTOP}/,,:C,[^/]+,H,g:S,/,:,g}}'; echo; \
	${MAKEFILE_SED} ${HOST_OS}/$f ) > ${.CURDIR}/$f
.endfor

# this needs the most work
_makefile:	bootstrap ${MAKEFILE}
	@echo Generating ${.CURDIR}/Makefile
	@(echo '# This is a generated file, do NOT edit!'; \
	echo '# See ${_this:S,${SRCTOP}/,,}'; \
	echo '#'; echo '# $$${HOST_OS}$$'; \
	echo; echo '.sinclude "Makefile.inc"'; \
	echo; echo 'SRCTOP?= $${.CURDIR:${.CURDIR:S,${SRCTOP}/,,:C,[^/]+,H,g:S,/,:,g}}'; \
	echo; echo '# look here first for config.h'; \
	echo 'CFLAGS+= -I$${.CURDIR}'; echo; \
	echo '# for after-import'; \
	echo 'CLEANDIRS+= ${HOST_OS}'; \
	echo 'CLEANFILES+= bootstrap'; echo; \
	${MAKEFILE_SED} \
	${1 2:L:@n@-e '/start-delete$n/,/end-delete$n/d'@} \
	${BMAKE_SRC}/Makefile; \
	echo; echo '# override some simple things'; \
	echo 'BINDIR= /usr/bin'; \
	echo 'MANDIR= ${MANDIR:U/usr/share/man}'; \
	echo; echo '# make sure we get this'; \
	echo 'CFLAGS+= $${COPTS.$${.IMPSRC:T}}'; \
	echo; echo 'after-import: ${_this:S,${SRCTOP},\${SRCTOP},}'; \
	echo '	cd $${.CURDIR} && $${.MAKE} -f ${_this:S,${SRCTOP},\${SRCTOP},}'; \
	echo ) > ${.TARGET}
	@cmp -s ${.TARGET} ${.CURDIR}/Makefile || \
	    mv ${.TARGET} ${.CURDIR}/Makefile

.include <bsd.obj.mk>