.PHONY: help

TMUX_VERSION     := 3.1b
NCURSES_VERSION  := 6.2
LIBEVENT_VERSION := 2.1.10-stable
UTF8PROC_VERSION := 2.4.0

BUILD_DIR           = $(CURDIR)
BUILD_PREBUILT_DEP  = $(BUILD_DIR)/prebuilt/dep
BUILD_PREBUILT_TMUX = $(BUILD_DIR)/prebuilt/tmux

LIBEVENT     = libevent-$(LIBEVENT_VERSION)
LIBEVENT_TGZ = $(LIBEVENT).tar.gz
LIBEVENT_URL = https://github.com/libevent/libevent/releases/download/release-$(LIBEVENT_VERSION)/$(LIBEVENT_TGZ)
LIBEVENT_LIB = $(BUILD_PREBUILT_DEP)/lib/libevent.a
LIBEVENT_MAK = $(LIBEVENT)/Makefile
LIBEVENT_A   = $(LIBEVENT)/.libs/libevent.a

NCURSES      = ncurses-$(NCURSES_VERSION)
NCURSES_TGZ  = $(NCURSES).tar.gz
NCURSES_URL  = https://invisible-mirror.net/archives/ncurses/$(NCURSES_TGZ)
NCURSES_LIB  = $(BUILD_PREBUILT_DEP)/lib/libncurses.a
NCURSES_MAK  = $(NCURSES)/Makefile
NCURSES_A    = $(NCURSES)/lib/libncurses.a

TMUX             := tmux-$(TMUX_VERSION).musl-bin.tar.gz

help: ## Display this help message
	@echo "Tmux: v$(TMUX_VERSION)"
	@echo "NCurses: v$(NCURSES_VERSION)"
	@echo "LibEvent: v$(LIBEVENT_VERSION)"
	@echo "UTF8Proc: v$(UTF8PROC_VERSION)"
	@echo ""
	@echo "Usage:"
	@sed -nE "s/^([^:]+):\\s+##\\s+(.+)$$/\tmake \\1\t- \\2/p" \
		$(lastword $(MAKEFILE_LIST))

clean: ## Remove all build and dist directories
	-rm -rf prebuilt $(LIBEVENT) $(NCURSES)

tmux: ## Build static tmux archive
	$(MAKE) $(TMUX)

####
#### Ncurses
####
ncurses: ## Download and build the ncurses libraru
	$(MAKE) $(NCURSES_LIB)

$(NCURSES_LIB): $(NCURSES_A)
	$(MAKE) -C $(NCURSES) install

$(NCURSES_A): $(NCURSES_MAK)
	$(MAKE) -C $(NCURSES) -j4 all

$(NCURSES_MAK): $(NCURSES)
	cd $(NCURSES) \
		&& ./configure \
				--prefix="$(BUILD_PREBUILT_DEP)" \
				--without-cxx \
				--without-cxx-binding \
				--with-termlib \
				--enable-termcap \
				--enable-ext-colors \
				--enable-ext-mouse \
				--enable-bsdpad \
				--enable-opaque-curses \
				--with-terminfo-dirs=/etc/terminfo:/usr/share/terminfo:/lib/terminfo \
				--with-termpath=/etc/termcap:/usr/share/misc/termcap \
				--with-fallbacks="linux,xterm,xterm-color,xterm-256color,vt100"

$(NCURSES): $(NCURSES_TGZ)
	tar xzf $(NCURSES_TGZ)

$(NCURSES_TGZ):
	curl -Lk $(NCURSES_URL) -o $(NCURSES_TGZ)

####
#### Libevent
####
libevent: ## Download and build libevent library
	$(MAKE) $(LIBEVENT_LIB)

$(LIBEVENT_LIB): $(LIBEVENT_A)
	$(MAKE) -C $(LIBEVENT) install

$(LIBEVENT_A): $(LIBEVENT_MAK)
	$(MAKE) -C $(LIBEVENT) -j4 all

$(LIBEVENT_MAK): $(LIBEVENT)
	cd $(LIBEVENT) \
		&& ./configure \
				--prefix="$(BUILD_PREBUILT_DEP)" \
				--disable-openssl \
				--enable-shared=no \
				--enable-static=yes \
				--with-pic

$(LIBEVENT): $(LIBEVENT_TGZ)
	tar xzf $<

$(LIBEVENT_TGZ):
	curl -Lk $(LIBEVENT_URL) -o $@

$(BUILD_PREBUILT_DEP): $(BUILD_DIR)
	mkdir -pv $@

$(BUILD_PREBUILT_TMUX): $(BUILD_DIR)
	mkdir -pv $@