.PHONY: help

TMUX_VERSION     := 3.1b
NCURSES_VERSION  := 6.2
LIBEVENT_VERSION := 2.1.10-stable
UTF8PROC_VERSION := 2.4.0
MUSL_VERSION     := 1.2.1

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

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

UTF8PROC     = utf8proc-$(UTF8PROC_VERSION)
UTF8PROC_TGZ = $(UTF8PROC).tar.gz
UTF8PROC_URL = https://github.com/JuliaLang/utf8proc/archive/v$(UTF8PROC_VERSION).tar.gz
UTF8PROC_LIB = $(BUILD_PREBUILT_DEP)/lib/utf8proc.a

MUSL      = musl-$(MUSL_VERSION)
MUSL_TGZ  = $(MUSL).tar.gz
MUSL_URL  = https://musl.libc.org/releases/$(MUSL_TGZ)
MUSL_GCC  = $(BUILD_PREBUILT_DEP)/bin/musl-gcc

TMUX         = tmux-$(TMUX_VERSION)
TMUX_TGZ     = $(TMUX).tar.gz
TMUX_DIST   := $(TMUX).musl-bin.tar.gz
TMUX_URL     = https://github.com/tmux/tmux/releases/download/$(TMUX_VERSION)/$(TMUX_TGZ)

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) $(UTF8PROC) $(MUSL) $(TMUX)

####
#### musl-libc
####
musl: ## Build musl static library
	$(MAKE) $(BUILD_PREBUILT_DEP) $(MUSL_GCC)

$(MUSL_GCC): $(MUSL)
	cd $(MUSL) \
		&& ./configure \
				--prefix="$(BUILD_PREBUILT_DEP)" \
				--enable-wrapper \
				--enable-static \
				--disable-shared \
				--enable-optimize \
		&& make -j4 \
		&& make install

$(MUSL): $(MUSL_TGZ)
	tar xzf $<

$(MUSL_TGZ):
	curl -Lk $(MUSL_URL) -o $@

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

$(LIBEVENT_LIB): $(LIBEVENT)
	cd $(LIBEVENT) \
		&& ./configure \
				--prefix="$(BUILD_PREBUILT_DEP)" \
				--disable-openssl \
				--enable-shared=no \
				--enable-static=yes \
				--with-pic
	$(MAKE) -C $(LIBEVENT) -j4
	$(MAKE) -C $(LIBEVENT) install

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

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

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

$(TMUX_DIST): $(TMUX)
	cd $(TMUX) && \
		PKG_CONFIG_PATH="$(BUILD_PREBUILT_DEP)/lib/pkgconfig" \
		LIBNCURSES_CFLAGS="-I$(BUILD_PREBUILT_DEP)/include/ncurses" \
		LIBNCURSES_LIBS="-L$(BUILD_PREBUILT_DEP)/lib" \
		LIBEVENT_CFLAGS="-I$(BUILD_PREBUILT_DEP)/include" \
		LIBEVENT_LIBS="-L$(BUILD_PREBUILT_DEP)/lib -levent" \
		./configure \
			--prefix="$(BUILD_PREBUILT_TMUX)" \
			--enable-static \
			--enable-utf8proc
	$(MAKE) -C $(TMUX) -j4

$(TMUX): $(TMUX_TGZ)
	tar xzf $<

$(TMUX_TGZ):
	curl -Lk $(TMUX_URL) -o $@

####
#### UTF8Proc
####
utf8proc: ## Download and build the UTF8Proc library
	$(MAKE) $(BUILD_PREBUILT_DEP) $(UTF8PROC_LIB)

$(UTF8PROC_LIB): $(UTF8PROC)
	mkdir -p $(UTF8PROC)/build
	cd $(UTF8PROC)/build \
		&& cmake .. \
				-DCMAKE_INSTALL_PREFIX="$(BUILD_PREBUILT_DEP)" \
				-DBUILD_SHARED_LIBS=OFF
	cd $(UTF8PROC)/build \
		&& cmake --build .
	cp -v $(UTF8PROC)/build/*.a $(BUILD_PREBUILT_DEP)/lib
	cp -v $(UTF8PROC)/*.h $(BUILD_PREBUILT_DEP)/include

$(UTF8PROC): $(UTF8PROC_TGZ)
	tar xzf $(UTF8PROC_TGZ)

$(UTF8PROC_TGZ):
	curl -Lk $(UTF8PROC_URL) -o $@

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

$(NCURSES_LIB): $(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"
	$(MAKE) -C $(NCURSES) -j4
	$(MAKE) -C $(NCURSES) install

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

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

####
#### prebuilt dirs
####
$(BUILD_PREBUILT_DEP):
	mkdir -pv $@

$(BUILD_PREBUILT_TMUX):
	mkdir -pv $@