# SPDX-License-Identifier: 0BSD


CXX ?= c++
CC ?= cc
CPP ?= cpp
MANDOC ?= mandoc
AWK ?= awk
SED ?= sed
SYMLINK ?= n
LTO ?= y
VOREUTILS_VERSION ?= $(shell git describe --always)
VOREUTILS_DATE ?= $(shell date $(shell date --version > /dev/null 2>&1 && echo "--date @" || echo "-r ")$(shell git log -1 --no-show-signature --format=%at) +"%B %e, %Y")
CFLAGS ?=
CPPFLAGS ?=
LDFLAGS ?=
OUTDIR ?= out/
OBJDIR ?= $(OUTDIR)obj/
CMDDIR ?= $(OUTDIR)cmd/
MANDIR ?= $(OUTDIR)man/
HTMLMANDIR ?= $(OUTDIR)man-html/


AS_NEEDED := -Wl,--as-needed
SONAME := -soname
SYSTEM := $(shell uname -s)
ifeq "$(SYSTEM)" "NetBSD"
	#
else ifeq "$(SYSTEM)" "OpenBSD"
	#
else ifeq "$(SYSTEM)" "Darwin"
	AS_NEEDED :=
	SONAME := -install_name
else
	#
endif

CXXVER := $(shell $(CXX) --version | head -1)
ifneq "$(findstring clang,$(CXXVER))" ""
	# GCC doesn't have this granularity
	CXXSPECIFICCC := -Wpedantic -Wno-c++20-designator -Wno-c99-extensions -Wno-unknown-warning-option
ifneq "$(findstring Apple,$(CXXVER))" ""
	# CMSG_SPACE() is a macro, and it's decidedly constexpr. i don't care if appleclang can't figure that out
	CXXSPECIFICCC += -Wno-vla-extension
endif
	CXXSPECIFICCC += -Wno-gnu-conditional-omitted-operand
	ifeq "$(LTO)" "y"
		CXXSPECIFICLD := -flto=full  # Clang produces .o files with LLVM bitcode, which cannot be linked to if put in .as
	else
		CXXSPECIFICLD :=
	endif
else
	CXXSPECIFICCC := -Wno-missing-field-initializers -fno-common
	ifeq "$(LTO)" "y"
		CXXSPECIFICCC += -flto
	endif
	CXXSPECIFICLD :=
endif

ifeq "$(SYMLINK)" "y"
SYMFLAG := s
endif

CCAR := -g -O3 -pipe -Wall -Wextra $(CXXSPECIFICCC) $(CFLAGS)
LDAR := $(AS_NEEDED) -L$(OUTDIR) $(CXXSPECIFICLD) $(LDFLAGS)
CPPAR := -Iinclude/ -DVOREUTILS_VERSION='"$(VOREUTILS_VERSION)"' -DVOREUTILS_DATE='"$(VOREUTILS_DATE)"' -include vore-id.h $(CPPFLAGS)
BINARIES := $(filter-out cmd/aliases,$(wildcard cmd/*))
INCLUDES := $(wildcard include/*)
MANPAGES := $(wildcard man/*.[18])


.PHONY : all binaries manpages htmlpages nomandoc clean test
.SECONDARY:

all : binaries manpages htmlpages
allpages : manpages htmlpages
clean:
	rm -rf $(OUTDIR) $(OBJDIR)

test : binaries
	CMDDIR=$(realpath $(CMDDIR))/ find "tests/" -mindepth 1 -maxdepth 1 -type f -print -execdir ./{} \; 3>$(OBJDIR)testpsko
	CMDDIR=$(realpath $(CMDDIR))/ find "tests/" -mindepth 2 -maxdepth 2 -type f -name test -print -execdir ./{} \; 3>>$(OBJDIR)testpsko
	@cat $(OBJDIR)testpsko >&2
	@! [ -s $(OBJDIR)testpsko ]

binaries : $(patsubst %.c,%,$(patsubst %.cpp,%,$(patsubst cmd/%,$(CMDDIR)%,$(BINARIES)))) $(OBJDIR)aliases
manpages : $(patsubst %,$(MANDIR)%,$(patsubst %.8,man8/%.8,$(patsubst %.1,man1/%.1,$(patsubst man/%,%,$(MANPAGES))))) $(OBJDIR)man/aliases
htmlpages : $(patsubst %,$(HTMLMANDIR)%.html,$(patsubst %.8,man8/%.8,$(patsubst %.1,man1/%.1,$(patsubst man/%,%,$(MANPAGES))))) $(OBJDIR)man/aliases $(HTMLMANDIR)style.css

nomandoc : $(MANPAGES) $(OBJDIR)man/aliases
	sh -xc 'for p; do cp "man/$$p" "$(MANDIR)man$${p##*.}/"; done' sh $(patsubst man/%,%,$(MANPAGES))


$(OBJDIR)man/aliases : man/aliases
	@mkdir -p $(dir $@) $(MANDIR) $(HTMLMANDIR)
	$(AWK) '!/^$$/ {                                          \
		sec1 = substr($$1, length($$1));                        \
		sec2 = substr($$2, length($$2));                        \
		rel = (sec1 == sec2) ? "" : "../man" sec1 "/";          \
		print "(mkdir -p man" sec1 " man" sec2 " && cd man" sec2 " && set -x && ln -fs " rel $$1 "$$suff " $$2 "$$suff)"; \
	}' $^ > $@
	{ cd $(MANDIR)     && suff=        sh; } < $@
	{ cd $(HTMLMANDIR) && suff=".html" sh; } < $@

# This ordering is suboptimal
$(OBJDIR)aliases : cmd/aliases $(patsubst %.c,%,$(patsubst %.cpp,%,$(patsubst cmd/%,$(CMDDIR)%,$(BINARIES))))
	@mkdir -p $(dir $@) $(CMDDIR)
	$(AWK) '!/^$$/ {print "ln -f$(SYMFLAG) " $$1 " " $$2}' $< > $@
	{ cd $(CMDDIR) && sh -x; } < $@

$(OBJDIR)man/% : man/%
	@mkdir -p $(dir $@)
	$(SED) 's/^\.Dd/.Dd $(VOREUTILS_DATE)/' $< > $@
	! $(MANDOC) -I os="voreutils $(VOREUTILS_VERSION)" -Tlint $@ 2>&1 | grep -vE -e 'mandoc: outdated mandoc.db' -e 'STYLE: referenced manual not found'

$(MANDIR)man1/% $(MANDIR)man8/% : $(OBJDIR)man/%
	@mkdir -p $(dir $@)
	$(MANDOC) -I os="voreutils $(VOREUTILS_VERSION)" -Tman  $< | grep -vF 'Automatically generated from an mdoc input file.' > $@

$(HTMLMANDIR)man1/%.html $(HTMLMANDIR)man8/%.html : $(OBJDIR)man/%
	@mkdir -p $(dir $@)
	$(MANDOC) -I os="voreutils $(VOREUTILS_VERSION)" -Thtml -Ostyle="../style.css",man="../man%S/%N.%S.html" $< | \
		$(AWK) '/^<h1/ {in_syn = $$0 ~ /id="SYNOPSIS"/}  /^<br/ {if(in_syn) next}  {print}' | \
		$(SED) -Ee 's/ title=".."//g' > $@

$(HTMLMANDIR)style.css : man/style.css
	@mkdir -p $(dir $@)
	cp $^ $@


$(CMDDIR)% : $(OBJDIR)cmd/%.o
	@mkdir -p $(dir $@)
	$(CXX) $(CCAR) $(LDAR) -std=c++17 -fno-exceptions -o $@ $^

$(OBJDIR)%.o : %.c
	@mkdir -p $(dir $@)
	$(CC) $(CCAR) $(CPPAR) -c -o $@ $^

$(OBJDIR)%.o : %.cpp $(INCLUDES)
	@mkdir -p $(dir $@)
	$(CXX) $(CCAR) $(CPPAR) -std=c++17 -fno-exceptions -c -o $@ $<