GITREV  ?= $(shell git describe --dirty --always)
BLDDATE ?= $(shell date -I)
CR_YEAR ?= $(shell date +%Y)
VERSION ?= "$(shell git describe --tags --always --abbrev=0 2>/dev/null || git rev-parse --short HEAD)"

CFLAGS ?= -Wall -Wextra -Wpedantic -O2 -std=gnu99
CFLAGS += -DGITREV='"$(GITREV)"'
CFLAGS += -DBLDDATE='"$(BLDDATE)"'
CFLAGS += -DCR_YEAR='"$(CR_YEAR)"'
CFLAGS += -DVERSION='$(VERSION)'
CFLAGS += $(EXTRA_CFLAGS)

PREFIX ?= /usr/local
DESTDIR ?=

writeimg: writeimg.c
	$(CC) $(CFLAGS) $(LDFLAGS) $(LIBS) -o $@ $^

clean:
	rm -f *.o writeimg

install: writeimg
	install -d $(DESTDIR)$(PREFIX)/bin
	install -d $(DESTDIR)$(PREFIX)/share/man/man1
	install -m 0755 $< $(DESTDIR)$(PREFIX)/bin/$<
	install -m 0644 $<.1 $(DESTDIR)$(PREFIX)/share/man/man1/$<.1

# Note that this bypasses PREFIX, since
# bash does not source /usr/local by default
install_bash: writeimg_completion_bash.sh
	install -d $(DESTDIR)/etc/bash_completion.d
	install -m 0644 $< $(DESTDIR)/etc/bash_completion.d/$<

uninstall:
	rm -f $(DESTDIR)$(PREFIX)/bin/writeimg
	rm -f $(DESTDIR)$(PREFIX)/share/man/man1/writeimg.1
	rm -f $(DESTDIR)/etc/bash_completion.d/writeimg*

.PHONY: clean install uninstall