# SPDX-License-Identifier: GPL-3.0-only

.SUFFIXES:
MAKEFLAGS += -Rr
.ONESHELL:
.SHELLFLAGS := -ec

RM := rm -f
MKDIR_P := mkdir -p
CHMOD := chmod

ifeq ("$(origin CC)", "default")
        CC := cc
endif
ifeq ("$(origin V)", "command line")
	SAY =
else
	SAY = @echo '$(strip $(1))'
endif

AUTHOR := Andre Noll
COPYRIGHT_YEAR := 2018
CLONE_URL := git://git.tuebingen.mpg.de/tfortune
GITWEB_URL := http://git.tuebingen.mpg.de/tfortune.git
LICENSE := GNU GPL version 3
LICENSE_URL := https://www.gnu.org/licenses/gpl-3.0-standalone.html

define DESCRIPTION1 :=
	Like fortune(1), tfortune is a Unix command line utility which prints
	a random epigram. Epigrams are stored as plain text files, but they
	must be annotated with tags to make full use of the features which
	tfortune offers over other implementations.
endef

define DESCRIPTION2 :=
	Tfortune has a built-in matching language for epigrams. User-supplied
	tag expressions define subsets of admissible epigrams. If a tag
	expression is given, epigrams are picked from the admissible subset
	only.
endef

define DESCRIPTION3 :=
	Besides printing random epigrams, tfortune supports a number of other
	subcommands which help to maintain epigrams and tag expressions. There
	are subcommands for listing and for editing the input files, and for
	printing statistics about epigrams, expressions and tags. A subcommand
	that enables bash command line completion is also included.
endef
LOGLEVELS := LL_DEBUG,LL_INFO,LL_NOTICE,LL_WARNING,LL_ERROR,LL_CRIT,LL_EMERG
GIT_VERSION := $(shell ./version-gen.sh)
cc_version := $(shell $(CC) --version | head -n 1)
build_date := $(shell date)
uname_rs := $(shell uname -rs)

all := tfortune tfortune.1
all: $(all)

deps := txp.bison.d txp.flex.d ast.d tfortune.d util.d txp.flex.d \
	tfortune.lsg.d version.d linhash.d

ifeq ($(findstring clean, $(MAKECMDGOALS)),)
-include $(deps)
include config.mak
endif

config.h.in: configure.ac
	$(call SAY, AH $<)
	autoheader -f
config.mak config.h: config.status config.mak.in config.h.in
	$(call SAY, CS $@)
	./config.status -q
	test -f config.h && touch config.h
config.status: configure.sh
	$(call SAY, CFG)
	if test -x config.status; then \
		./config.status --recheck; \
	else \
		./configure.sh --no-create; \
	fi
configure.sh: configure.ac
	$(call SAY, AC $<)
	autoconf configure.ac > $@
	$(CHMOD) 755 $@

.PRECIOUS: %.flex.c %.bison.c %.bison.h %.lsg.h %.lsg.c %.lsg.h

# created by version-gen.sh
version.c:

index.html tfortune.suite: %: %.m4
	$(call SAY, M4 $<)
	$(M4) -D "AUTHOR=$(AUTHOR)" -D "COPYRIGHT_YEAR=$(COPYRIGHT_YEAR)" \
		-D "PACKAGE_BUGREPORT=$(PACKAGE_BUGREPORT)" \
		-D "PACKAGE_URL=$(PACKAGE_URL)" \
		-D "CLONE_URL=$(CLONE_URL)" \
		-D "GITWEB_URL=$(GITWEB_URL)" \
		-D "LICENSE=$(LICENSE)" \
		-D "LICENSE_URL=$(LICENSE_URL)" \
		-D "DESCRIPTION1=$(DESCRIPTION1)" \
		-D "DESCRIPTION2=$(DESCRIPTION2)" \
		-D "DESCRIPTION3=$(DESCRIPTION3)" $< > $@
%.lsg.c: %.suite
	$(call SAY, LSGC $<)
	$(LOPSUBGEN) --gen-c < $<

%.lsg.h: %.suite
	$(call SAY, LSGH $<)
	$(LOPSUBGEN) --gen-header < $<

%.1: %.suite version.c
	$(call SAY, LSGM $<)
	$(LOPSUBGEN) --gen-man=$@ --version-string $(GIT_VERSION) < $<

%.flex.c: %.lex
	$(call SAY, FLEX $<)
	$(FLEX) -o $@ $<

%.bison.c %.bison.h: %.y
	$(call SAY, BISON $<)
	$(BISON) --defines=$(notdir $(<:.y=.bison.h)) \
		--output=$(notdir $(<:.y=.bison.c)) $<

TF_CPPFLAGS += -Wunused-macros
TF_CPPFLAGS += -DCOPYRIGHT_YEAR='"$(COPYRIGHT_YEAR)"'
TF_CPPFLAGS += -DAUTHOR='"$(AUTHOR)"'
TF_CPPFLAGS += -DLOGLEVELS='$(LOGLEVELS)'
TF_CPPFLAGS += -DBUILD_DATE='"$(build_date)"'
TF_CPPFLAGS += -DCC_VERSION='"$(cc_version)"'
TF_CPPFLAGS += -DUNAME_RS='"$(uname_rs)"'
TF_CPPFLAGS += -DLICENSE='"$(LICENSE)"'
TF_CPPFLAGS += -DLICENSE_URL='"$(LICENSE_URL)"'
TF_CPPFLAGS += -I/usr/local/include

TF_CFLAGS += -g
TF_CFLAGS += -O2
TF_CFLAGS += -Wall
TF_CFLAGS += -Wundef -W -Wuninitialized
TF_CFLAGS += -Wchar-subscripts
TF_CFLAGS += -Werror-implicit-function-declaration
TF_CFLAGS += -Wmissing-noreturn
TF_CFLAGS += -Wbad-function-cast
TF_CFLAGS += -Wredundant-decls
TF_CFLAGS += -Wdeclaration-after-statement
TF_CFLAGS += -Wformat -Wformat-security -Wmissing-format-attribute
#TF_CFLAGS += -fsanitize=address

%.flex.o: TF_CFLAGS += -Wno-all -Wno-sign-compare -Wno-unused-parameter
%.flex.o %.bison.o: TF_CPPFLAGS += -Wno-unused-macros

%.o: %.c tfortune.lsg.h txp.bison.h
	$(call SAY, CC $<)
	$(CC) \
		-o $@ -c -MMD -MF $(*F).d \
		-MT $@ $(TF_CPPFLAGS) $(CPPFLAGS) $(TF_CFLAGS) $(CFLAGS) $<

TF_LDFLAGS = -llopsub
#TF_LDFLAGS += -fsanitize=address

tfortune: $(deps:.d=.o)
	$(call SAY, LD $@)
	$(CC) $^ -o $@ $(TF_LDFLAGS) $(LDFLAGS)

.PHONY: all mostlyclean clean distclan maintainer-clean install \
	install-strip README

mostlyclean:
	$(RM) tfortune *.o *.d
clean: mostlyclean
	$(RM) *.lsg.* *.flex.* *.bison.* *.1 *.suite
distclean: clean
	$(RM) config.mak config.status config.log config.h config.h.in version.c
	$(RM) -r autom4te.cache
maintainer-clean:
	git clean -dfqx > /dev/null 2>&1

mandir := $(datarootdir)/man/man1
INSTALL ?= install
INSTALL_PROGRAM ?= $(INSTALL) -m 755
INSTALL_DATA ?= $(INSTALL) -m 644
ifneq ($(findstring strip, $(MAKECMDGOALS)),)
	strip_option := -s
endif

install install-strip: all
	$(MKDIR_P) $(DESTDIR)$(bindir) $(DESTDIR)$(mandir)
	$(INSTALL_PROGRAM) $(strip_option) tfortune $(DESTDIR)$(bindir)
	$(INSTALL_DATA) tfortune.1 $(DESTDIR)$(mandir)

define README :=
tfortune - fortune cookies with tags
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
$(DESCRIPTION1)

$(DESCRIPTION2)

$(DESCRIPTION3)

Resources
~~~~~~~~~
|	git clone URL: $(CLONE_URL)
|	web page: $(PACKAGE_URL)
|	email: $(AUTHOR) <$(PACKAGE_BUGREPORT)>

Documentation
~~~~~~~~~~~~~
See tfortune.suite. Or build the man page with \"make tfortune.1\"
and run \"man -l tfortune.1\".

Dependencies
~~~~~~~~~~~~
This package requires m4, autoconf, gnu make, flex, bison, gcc or
clang, and lopsub. The configure script checks if all required
dependencies are installed and prints a meaningful error message if
one of them is missing.

Building
~~~~~~~~
Run \"make\" to build tfortune with the default settings. Run
\"./configure -h\" to list configuration options.

Installation
~~~~~~~~~~~~
Run \"sudo make install\" to install to /usr/local. To install to
/somewhere/else, run \"./configure --prefix /somewhere/else && make\"
first.
endef

README:
	@printf '%s\n' "$(README)"