# Copyright (c) 2023–2024 Emma Tebibyte <emma@tebibyte.media>
# Copyright (c) 2023–2024 DTB <trinity@trinity.moe>
# Copyright (c) 2023 Sasha Koshka <sashakoshka@tebibyte.media>
# Copyright (c) 2024 Aaditya Aryal <aryalaadi123@gmail.com>
# SPDX-License-Identifier: FSFAP
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice and this
# notice are preserved.  This file is offered as-is, without any warranty.

# The octal escape \043 is utilized twice in this file as make(1p) will
# interpret a hash in a rule as an inline comment.

.POSIX:

DESTDIR ?= dist
PREFIX ?= /usr/local

MANDIR != [ $(PREFIX) = / ] && printf '/usr/share/man\n' \
	|| printf '/share/man\n'

CC ?= cc
RUSTC ?= rustc
RUSTLIBS = --extern getopt=build/o/libgetopt.rlib \
	--extern sysexits=build/o/libsysexits.rlib \
	--extern strerror=build/o/libstrerror.rlib
CFLAGS += -Ibuild/include

.PHONY: all
all: docs dj false fop hru intcmp mm npc rpn scrut str strcmp swab true

build:
	mkdir -p build/bin build/docs build/include build/lib build/o build/test

.PHONY: clean
clean:
	rm -rf build dist

dist: all
	mkdir -p $(DESTDIR)/$(PREFIX)/bin $(DESTDIR)/$(PREFIX)/share/man/man1
	cp build/bin/* $(DESTDIR)/$(PREFIX)/bin
	cp build/docs/*.1 $(DESTDIR)/$(PREFIX)/$(MANDIR)/man1

.PHONY: install
install: dist
	cp -r $(DESTDIR)/* /

.PHONY: test
test: build
	tests/posix-compat.sh
	$(RUSTC) --test src/getopt-rs/lib.rs -o build/test/getopt

.PHONY: docs
docs: docs/ build
	for file in docs/*; do original="$$(sed -n '/^\.TH/p' <"$$file")"; \
		title="$$(printf '%s\n' "$$original" | sed \
		"s/X\.X\.X/$$(git describe --tags --long | cut -d'-' -f1)/g")"; \
		sed "s/$$original/$$title/g" <"$$file" >"build/$$file"; done

.PHONY: rustlibs
rustlibs: build/o/libsysexits.rlib build/o/libgetopt.rlib \
	build/o/libstrerror.rlib

build/include/sysexits.h: build
	cpp -dM -include sysexits.h /dev/null \
			| grep '^.define EX_' >$@ \
		|| cpp -dM -include stdlib.h include/sysexits.h.template \
			| grep -e '^.define EX_' -e '^.define EXIT_' >$@

build/o/libgetopt.rlib: build src/getopt-rs/lib.rs
	$(RUSTC) $(RUSTFLAGS) --crate-type=lib --crate-name=getopt \
		-o $@ src/getopt-rs/lib.rs

build/o/libstrerror.rlib: build src/strerror.rs
	$(RUSTC) $(RUSTFLAGS) --crate-type=lib -o $@ \
		src/strerror.rs

build/o/libsysexits.rlib: build build/include/sysexits.h
	<build/include/sysexits.h \
		awk '{ print "pub const " $$2 ": i32 = " $$3 ";"; }' \
		| $(RUSTC) $(RUSTFLAGS) --crate-type lib -o $@ -

.PHONY: dj
dj: build/bin/dj
build/bin/dj: src/dj.c build
	$(CC) $(CFLAGS) -o $@ src/dj.c

.PHONY: false
false: build/bin/false
build/bin/false: src/false.c build
	$(CC) $(CFLAGS) -o $@ src/false.c

.PHONY: fop
fop: build/bin/fop
build/bin/fop: src/fop.rs build rustlibs
	$(RUSTC) $(RUSTFLAGS) $(RUSTLIBS) -o $@ src/fop.rs

.PHONY: hru
hru: build/bin/hru
build/bin/hru: src/hru.rs build rustlibs 
	$(RUSTC) $(RUSTFLAGS) $(RUSTLIBS) -o $@ src/hru.rs

.PHONY: intcmp
intcmp: build/bin/intcmp
build/bin/intcmp: src/intcmp.c build
	$(CC) $(CFLAGS) -o $@ src/intcmp.c

.PHONY: mm
mm: build/bin/mm
build/bin/mm: src/mm.c build
	$(CC) $(CFLAGS) -o $@ src/mm.c

.PHONY: npc
npc: build/bin/npc
build/bin/npc: src/npc.c build
	$(CC) $(CFLAGS) -o $@ src/npc.c

.PHONY: rpn
rpn: build/bin/rpn
build/bin/rpn: src/rpn.rs build rustlibs
	$(RUSTC) $(RUSTFLAGS) $(RUSTLIBS) -o $@ src/rpn.rs

.PHONY: scrut
scrut: build/bin/scrut
build/bin/scrut: src/scrut.c build
	$(CC) $(CFLAGS) -o $@ src/scrut.c

.PHONY: str
str: build/bin/str
build/bin/str: src/str.c build
	$(CC) $(CFLAGS) -o $@ src/str.c

.PHONY: strcmp
strcmp: build/bin/strcmp
build/bin/strcmp: src/strcmp.c build
	$(CC) $(CFLAGS) -o $@ src/strcmp.c

.PHONY: swab
swab: build/bin/swab
build/bin/swab: src/swab.rs build rustlibs
	$(RUSTC) $(RUSTFLAGS) $(RUSTLIBS) -o $@ src/swab.rs

.PHONY: true
true: build/bin/true
build/bin/true: src/true.c build
	$(CC) $(CFLAGS) -o $@ src/true.c