VERSION = $(shell grep -m1 VERSION $(SRC) | cut -f 2 -d'"')

PREFIX ?= /usr/local
MANPREFIX ?= $(PREFIX)/share/man
STRIP ?= strip
PKG_CONFIG ?= pkg-config
INSTALL ?= install
CP ?= cp

CFLAGS_OPTIMIZATION ?= -O3

O_DEBUG := 0
O_NORL := 0  # no readline support
O_NOLOC := 0  # no locale support

# convert targets to flags for backwards compatibility
ifneq ($(filter debug,$(MAKECMDGOALS)),)
	O_DEBUG := 1
endif
ifneq ($(filter norl,$(MAKECMDGOALS)),)
	O_NORL := 1
endif
ifneq ($(filter noloc,$(MAKECMDGOALS)),)
	O_NORL := 1
	O_NOLOC := 1
endif

ifeq ($(O_DEBUG),1)
	CPPFLAGS += -DDBGMODE
	CFLAGS += -g
	LDLIBS += -lrt
endif

ifeq ($(O_NORL),1)
	CPPFLAGS += -DNORL
else
	LDLIBS += -lreadline
endif

ifeq ($(O_NOLOC),1)
	CPPFLAGS += -DNOLOCALE
endif

ifeq ($(shell $(PKG_CONFIG) ncursesw && echo 1),1)
	CFLAGS_CURSES ?= $(shell $(PKG_CONFIG) --cflags ncursesw)
	LDLIBS_CURSES ?= $(shell $(PKG_CONFIG) --libs   ncursesw)
else ifeq ($(shell $(PKG_CONFIG) ncurses && echo 1),1)
	CFLAGS_CURSES ?= $(shell $(PKG_CONFIG) --cflags ncurses)
	LDLIBS_CURSES ?= $(shell $(PKG_CONFIG) --libs   ncurses)
else
	LDLIBS_CURSES ?= -lncurses
endif

CFLAGS += -Wall -Wextra
CFLAGS += $(CFLAGS_OPTIMIZATION)
CFLAGS += $(CFLAGS_CURSES)

LDLIBS += $(LDLIBS_CURSES)

# static compilation needs libgpm development package
ifeq ($(O_STATIC),1)
	LDFLAGS += -static
	LDLIBS += -lgpm
endif

DISTFILES = src nnn.1 Makefile README.md LICENSE
SRC = src/nnn.c
HEADERS = src/nnn.h
BIN = nnn

all: $(BIN)

$(BIN): $(SRC) $(HEADERS)
	$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ $< $(LDLIBS)

# targets for backwards compatibility
debug: $(BIN)
norl: $(BIN)
noloc: $(BIN)

install: all
	$(INSTALL) -m 0755 -d $(DESTDIR)$(PREFIX)/bin
	$(INSTALL) -m 0755 $(BIN) $(DESTDIR)$(PREFIX)/bin
	$(INSTALL) -m 0755 -d $(DESTDIR)$(MANPREFIX)/man1
	$(INSTALL) -m 0644 $(BIN).1 $(DESTDIR)$(MANPREFIX)/man1

uninstall:
	$(RM) $(DESTDIR)$(PREFIX)/bin/$(BIN)
	$(RM) $(DESTDIR)$(MANPREFIX)/man1/$(BIN).1

strip: $(BIN)
	$(STRIP) $^

dist:
	mkdir -p nnn-$(VERSION)
	$(CP) -r $(DISTFILES) nnn-$(VERSION)
	tar -cf - nnn-$(VERSION) | gzip > nnn-$(VERSION).tar.gz
	$(RM) -r nnn-$(VERSION)

sign:
	git archive -o nnn-$(VERSION).tar.gz --format tar.gz --prefix=nnn-$(VERSION)/ v$(VERSION)
	gpg --detach-sign --yes nnn-$(VERSION).tar.gz
	rm -f nnn-$(VERSION).tar.gz

	$(eval ID=$(shell curl -s 'https://api.github.com/repos/jarun/nnn/releases/tags/v$(VERSION)' | jq .id))
	curl -XPOST 'https://uploads.github.com/repos/jarun/nnn/releases/$(ID)/assets?name=nnn-$(VERSION).tar.gz.sig' \
	    -H 'Authorization: token $(NNN_SIG_UPLOAD_TOKEN)' -H 'Content-Type: application/pgp-signature' \
	    --upload-file nnn-$(VERSION).tar.gz.sig

clean:
	$(RM) -f $(BIN) nnn-$(VERSION).tar.gz *.sig

skip: ;

.PHONY: all install uninstall strip dist sign clean