#!/usr/bin/make -f

# New stable upstream release TODO:
#   s/A.B/C.D/go in debian/control.
#   Adjust debian/changelog.
#   Adjust "ver" variables below.
#   Adjust debian/guile-libs.lintian.
#   Adjust debian/.gitignore.
#   Fix deb_alt_priority below.

SHELL := /bin/bash

pf := set -o pipefail

# Mess to check the exit status of shell commands.  To use it, make sure
# all shell invocations end with $(rc) to print $?, and then pass the
# shell output through shout, which will strip off the exit status if
# it's 0, or crash with diagnostic information if it's not.
chop = $(wordlist 2,$(words $1),x $1)
rc := echo " $$?"
diesh = $(info $(call chop,$(1)))$(info exit: $(lastword $(1)))$(error ($2))
shout = $(if $(lastword $(1)),$(if $(subst 0,,$(lastword $(1))),$(call diesh,$(1),$(2)),$(call chop,$(1))),$(call diesh,$(1),$(2)))

# Make sure the build process doesn't touch the real HOME.
export HOME := $(CURDIR)/debian/no-trespassing

# Keep this in sync with guile-doc.install
expected_info := guile.info $(foreach n,1 2 3 4 5 6 7 8 9 10,guile.info-$(n))

# Uncomment this to turn on verbose mode.
#export DH_VERBOSE := 1

# The version from the changelog (i.e. 2.0.3-1)
deb_src_ver := $(shell dpkg-parsechangelog -S version; $(rc))
deb_src_ver := $(call shout,$(deb_src_ver),dpkg-parsechangelog failed)

# The Debian revision, everything after the last '-' (i.e. the 1 from 2.0.3-1)
deb_src_rev := $(shell $(pf); echo $(deb_src_ver) | sed -e 's/.*-//'; $(rc))
deb_src_rev := $(call shout,$(deb_src_rev),unable to get deb_src_rev)

# Upstream version, everything before the last '-'.
deb_src_ver := $(shell $(pf); echo $(deb_src_ver) | sed -e 's/-[^-]*//'; $(rc))
deb_src_ver := $(call shout,$(deb_src_ver),unable to get deb_src_ver)

deb_src_src_rev := \
  $(shell $(pf); echo $(deb_src_ver) | sed -re 's/.*\+([0-9]+).*/\1/'; $(rc))
deb_src_src_rev := $(call shout,$(deb_src_src_rev),unable to get deb_src_src_rev)

upstream_ver := $(shell $(pf); echo $(deb_src_ver) | sed -e 's/\+.*//'; $(rc))
upstream_ver := $(call shout,$(upstream_ver),unable to get upstream_ver)

# Upstream components
deb_src_maj_ver := $(shell $(pf); echo $(upstream_ver) | cut -d. -f 1; $(rc))
deb_src_min_ver := $(shell $(pf); echo $(upstream_ver) | cut -d. -f 2; $(rc))
deb_src_mic_ver := $(shell $(pf); echo $(upstream_ver) | cut -d. -f 3; $(rc))
deb_src_maj_ver := $(call shout,$(deb_src_maj_ver),unable to get deb_src_maj_ver)
deb_src_min_ver := $(call shout,$(deb_src_min_ver),unable to get deb_src_min_ver)
deb_src_mic_ver := $(call shout,$(deb_src_mic_ver),unable to get deb_src_mic_ver)

deb_src_eff_ver := $(deb_src_maj_ver).$(deb_src_min_ver)
deb_pkg_basename := guile-$(deb_src_eff_ver)
deb_guile_bin_path := /usr/bin/guile-$(deb_src_eff_ver)

ifneq (ok,$(shell x='$(deb_src_min_ver)';  [ "$${\#x}" -lt 4 ] && echo ok;))
  $(error ERROR: alternatives priority expects min version < 1000)
endif

# Up to and including some releases of 2.0.11, this was (incorrectly)
# majminmic (i.e. 2011 for 2.0.11), so stick with something compatible
# until 3.0.  This approach assumes 2.0 will never reach 2.0.200, and
# 2.2 will never have enough minor releases to overflow to 3000.
deb_alt_priority := $(deb_src_maj_ver)$(shell echo $$(($(deb_src_min_ver) + 200)))

# For 3.0, switch to this, i.e. 3.0 -> 3000, 3.1 -> 3001, 3.2 -> 3002, etc.
#deb_alt_priority := $(deb_src_maj_ver)$(shell printf "%03d" $(deb_src_min_ver))

multiarch := $(shell dpkg-architecture -qDEB_HOST_MULTIARCH; $(rc))
multiarch := $(call shout,$(multiarch),dpkg-architecture failed)
ifneq ($(multiarch),)
  march = $(multiarch)/
else
  march =
endif

export DEB_CFLAGS_MAINT_APPEND := \
  -DPACKAGE_PACKAGER='"Debian"' \
  -DPACKAGE_PACKAGER_VERSION='"$(upstream_ver)-deb+$(deb_src_src_rev)-$(deb_src_rev)"' \
  -DPACKAGE_PACKAGER_BUG_REPORTS='"http://www.debian.org/Bugs/Reporting"'

# https://debbugs.gnu.org/29464
export DEB_CFLAGS_MAINT_APPEND += -fno-stack-protector

define checkdir
  dh_testdir debian/guile.postinst
endef

%:
	dh $@ --parallel --with autoreconf

.PHONY: check-vars
check-vars:
	@echo "    upstream_ver:" $(upstream_ver)
	@echo "deb_pkg_basename:" $(deb_pkg_basename)
	@echo "     deb_src_ver:" $(deb_src_ver)
	@echo " deb_src_eff_ver:" $(deb_src_eff_ver)
	@echo " deb_src_maj_ver:" $(deb_src_maj_ver)
	@echo " deb_src_min_ver:" $(deb_src_min_ver)
	@echo " deb_src_mic_ver:" $(deb_src_mic_ver)
	@echo " deb_src_src_rev:" $(deb_src_src_rev)
	@echo "     deb_src_rev:" $(deb_src_rev)
	@echo "deb_alt_priority:" $(deb_alt_priority)

# For now, assumes there are no "|" characters in the expansions.
debian/autogen.sed: debian/rules debian/changelog
	echo "s|@UPSTREAM_VER@|$(upstream_ver)|g" > "$@.tmp"
	echo "s|@DEB_SRC_VER@|$(deb_src_ver)|g" >> "$@.tmp"
	echo "s|@DEB_SRC_MAJ_VER@|$(deb_src_maj_ver)|g" >> "$@.tmp"
	echo "s|@DEB_SRC_MIN_VER@|$(deb_src_min_ver)|g" >> "$@.tmp"
	echo "s|@DEB_SRC_MIC_VER@|$(deb_src_mic_ver)|g" >> "$@.tmp"
	echo "s|@DEB_SRC_EFF_VER@|$(deb_src_eff_ver)|g" >> "$@.tmp"
	echo "s|@DEB_PKG_BASENAME@|$(deb_pkg_basename)|g" >> "$@.tmp"
	echo "s|@DEB_ALT_PRIORITY@|$(deb_alt_priority)|g" >> "$@.tmp"
	echo "s|@MARCH@|$(march)|g" >> "$@.tmp"
	mv "$@.tmp" "$@"

autogen_install_files := $(addprefix debian/, \
  guile-$(deb_src_eff_ver).install \
  guile-$(deb_src_eff_ver).links \
  guile-$(deb_src_eff_ver).menu \
  guile-$(deb_src_eff_ver).undocumented \
  guile-$(deb_src_eff_ver)-dev.install \
  guile-$(deb_src_eff_ver)-doc.README.Debian \
  guile-$(deb_src_eff_ver)-doc.install \
  guile-$(deb_src_eff_ver)-libs.install \
  guile-$(deb_src_eff_ver)-libs.lintian-overrides)

autogen_installdeb_files := $(addprefix debian/, \
  guile-$(deb_src_eff_ver).postinst \
  guile-$(deb_src_eff_ver).prerm \
  guile-$(deb_src_eff_ver)-dev.postinst \
  guile-$(deb_src_eff_ver)-dev.prerm \
  guile-$(deb_src_eff_ver)-doc.postinst \
  guile-$(deb_src_eff_ver)-doc.prerm \
  guile-$(deb_src_eff_ver)-libs.postinst \
  guile-$(deb_src_eff_ver)-libs.prerm \
  guile-$(deb_src_eff_ver)-libs.triggers)

debian/guile-$(deb_src_eff_ver).%: debian/guile.% debian/autogen.sed
	sed -f debian/autogen.sed "$<" > "$@.tmp"
	mv "$@.tmp" "$@"
debian/guile-$(deb_src_eff_ver)-dev.%: debian/guile-dev.% debian/autogen.sed
	sed -f debian/autogen.sed "$<" > "$@.tmp"
	mv "$@.tmp" "$@"
debian/guile-$(deb_src_eff_ver)-doc.%: debian/guile-doc.% debian/autogen.sed
	sed -f debian/autogen.sed "$<" > "$@.tmp"
	mv "$@.tmp" "$@"
debian/guile-$(deb_src_eff_ver)-libs.%: debian/guile-libs.% debian/autogen.sed
	sed -f debian/autogen.sed "$<" > "$@.tmp"
	mv "$@.tmp" "$@"

debian/guile-$(deb_src_eff_ver)-doc.postinst:
	DEB_PKG_BASENAME="$(deb_pkg_basename)" \
	DEB_INFO_SUBDIR="$(deb_pkg_basename)" \
	DEB_ALT_PRIORITY="$(deb_alt_priority)" \
	  debian/guile-doc.postinst.gen $(addprefix doc/ref/,$(expected_info)) \
	    > "$@".tmp
	mv "$@.tmp" "$@"

override_dh_testdir:
	$(checkdir)

override_dh_autoreconf:
	echo '$(upstream_ver)' > .version
	cp -a .version .tarball-version
	dh_autoreconf ./autogen.sh

override_dh_auto_configure:
	dh_auto_configure -- --disable-error-on-warning --disable-rpath \
	  --program-suffix "-$(deb_src_eff_ver)"

override_dh_auto_clean:
        # If Makefile doesn't exist GNUmakefile will abort on distclean.
	if test -e Makefile; then make distclean; fi

override_dh_clean:
	-$(MAKE) -C prebuilt clean
	dh_clean $(autogen_install_files) $(autogen_installdeb_files) \
	  .tarball-version \
	  .version \
	  blarg-clean \
	  bootstrap/ice-9/ \
	  bootstrap/language/ \
	  bootstrap/srfi/ \
	  bootstrap/system/ \
	  debian/autogen.sed \
	  doc/r5rs/r5rs.info \
	  doc/ref/autoconf-macros.texi \
	  doc/ref/effective-version.texi \
	  doc/ref/guile.info \
	  doc/ref/guile.info-1 \
	  doc/ref/guile.info-10 \
	  doc/ref/guile.info-2 \
	  doc/ref/guile.info-3 \
	  doc/ref/guile.info-4 \
	  doc/ref/guile.info-5 \
	  doc/ref/guile.info-6 \
	  doc/ref/guile.info-7 \
	  doc/ref/guile.info-8 \
	  doc/ref/guile.info-9 \
	  doc/ref/stamp-vti \
	  doc/ref/version.texi \
	  filesys-test-link.tmp \
	  guile-procedures.txt \
	  libguile/c-tokenize.c \
	  libguile/cpp-E.c \
	  libguile/cpp-SIG.c \
	  libguile/vm-operations.h

# Info pages are installed to /usr/share/info/guile-X.Y/ via
# guile-doc.install, and handled via update-alternatives.
override_dh_installinfo:
	true

override_dh_auto_install: $(autogen_install_files)
	make DESTDIR="$$(pwd)/debian/tmp" INSTALL='install -p' install
	rm -f debian/tmp/usr/lib/$(march)libguile*.la

gdb_ext := \
  debian/$(deb_pkg_basename)-libs/usr/lib/$(march)libguile-$(deb_src_eff_ver).so*-gdb.scm
gdb_ext_dir := debian/$(deb_pkg_basename)-dev/usr/share/gdb/auto-load

override_dh_install-arch: $(autogen_install_files)
	cd debian/tmp/usr/bin && mv -i guile-$(deb_src_eff_ver) guile
	dh_install -a
	dh_missing -a --fail-missing \
	  -Xusr/lib/$(march)guile/$(deb_src_eff_ver)/extensions/guile-readline.a \
	  -Xusr/lib/$(march)guile/$(deb_src_eff_ver)/extensions/guile-readline.la
	test -e $(gdb_ext)
	mkdir -p $(gdb_ext_dir)
	mv $(gdb_ext) $(gdb_ext_dir)

override_dh_install-indep: $(autogen_install_files)
        # Glob should match the one in debian/guile-doc.install
	test "$(sort $(expected_info))" = \
	  "$(sort $(shell cd debian/tmp/usr/share/info && ls guile.info*))"
	dh_install -i
	dh_missing -i --fail-missing \
	  -Xusr/bin/guile-$(deb_src_eff_ver) \
	  -Xusr/share/info/dir \
	  -Xusr/share/info/r5rs.info \
	  -Xusr/lib/$(march)guile/$(deb_src_eff_ver)/extensions/guile-readline.a \
	  -Xusr/lib/$(march)guile/$(deb_src_eff_ver)/extensions/guile-readline.la
	test ! -e debian/guile-$(deb_src_eff_ver)-doc/usr/share/info/dir

override_dh_installdeb: $(autogen_installdeb_files)
	dh_installdeb