#!/usr/bin/make -f

# resolve DEB_VERSION
include /usr/share/dpkg/pkg-info.mk

export DEB_BUILD_MAINT_OPTIONS = hardening=+all
export DEB_CFLAGS_MAINT_APPEND  = -Wall -pedantic
export DEB_CXXFLAGS_MAINT_APPEND  = -Wall -pedantic

# trust upstream optimization level unless explicitly disabled
ifeq (,$(filter noopt,$(DEB_BUILD_OPTIONS)))
export DEB_CFLAGS_MAINT_STRIP=-O2
export DEB_CXXFLAGS_MAINT_STRIP=-O2
endif

# generate documentation unless nodoc requested
ifeq (,$(filter nodoc,$(DEB_BUILD_OPTIONS)))
DOCS = README.html README.txt
MANPAGES = debian/pikchr-cli.1
endif

# resolve crate version
# * get topmost version except prerelease suffix
#   from Cargo.toml file in dir passed as argument
# * source package version if matching upstream part modulo prerelease
# * otherwise append source package version
crate_version = \
 $(shell perl -n \
 -E '/version\W+\K\d+\.\d+\.\d+/ ' \
 -E 'and say "$(DEB_VERSION_UPSTREAM)" =~ /^\Q$$&\E(?:~[a-z]+\d*)?$$/ ? "$(DEB_VERSION)" : "$$&+$(DEB_VERSION_UPSTREAM_REVISION)" and exit' \
 $1/Cargo.toml)

# generate manual pages from output of clap-based Rust binary
#  arguments: 1:MANFILEPATH 2:COMMANDPATH 3:SUBCOMMAND(S)
_help2man = \
 $(eval suffix = $(lastword $(subst ., ,$(1))))\
 $(eval stem = $(patsubst %.$(suffix),%,$(1)))\
 help2man --section $(suffix) --no-info \
 --version-string='$(DEB_VERSION_UPSTREAM)' \
 --name $(shell $(2) $(3) --help | head --lines=1 | xargs -0 shell-quote --) \
 --output '$(stem)$(if $(3),-$(subst $() ,-,$(strip $(3)))).$(suffix)' \
 '$(2)$(if $(3), $(3))' \
 || { $(2) $(3) --help; false; }

%:
	dh $@

%.html: %.md
	cmark-gfm $< > $@

%.txt: %.md
	cmark-gfm --to plaintext $< > $@

execute_after_dh_auto_build: $(DOCS)

execute_after_dh_auto_install: $(MANPAGES)

override_dh_installdocs:
	dh_installdocs --all -- $(DOCS)

override_dh_gencontrol:
	dh_gencontrol -ppikchr-cli -- \
	 -v'$(call crate_version,pikchr-cli)'
	dh_gencontrol --remaining-packages

# build manpages
debian/pikchr-cli.1: debian/%.1: debian/pikchr-cli/usr/bin/%
	$(call _help2man,$@,$<)