dotfiles/.config/nvim/Makefile

FENNEL ?= fennel
FNL_ARGS := --add-macro-path './fnl/?.fnl' --add-fennel-path './fnl/?.fnl;fnl/?/init.fnl'

uniq = $(if $1,$(firstword $1) $(call uniq,$(filter-out $(firstword $1),$1)))
reverse = $(if $(wordlist 2,2,$(1)), \
	$(call reverse,$(wordlist 2,$(words $(1)),$(1))) \
	$(firstword $(1)),$(1))
rwildcard = $(foreach d,$(wildcard $1/*),$(call rwildcard,$d,$2) \
	$(filter $(subst *,%,$2),$d))

FNL_SRC  := $(foreach p, \
	    $(filter-out %macros.fnl,$(call rwildcard,./fnl,*.fnl)), \
	    $(if $(findstring /plug/,${p}),,$p))
LUA_DST  := $(subst ./fnl/,./lua/,${FNL_SRC:.fnl=.lua})
LUA_DIRS := $(sort $(call uniq,$(foreach _,${LUA_DST},$(call dir,$_))))


.PHONY: all
all: lua

.PHONY: fnl
fnl: fnl.init

.PHONY: lua
lua: lua.init


${LUA_DST}: lua/%.lua: fnl/%.fnl ${LUA_DIRS}
	@  compiled="$$($(FENNEL) ${FNL_ARGS} -c $<)" \
	&& printf '%s\n' "$${compiled}" > $@ \
	&& printf '%s -> %s\n' '$<' '$@'

${LUA_DIRS}:
	@mkdir -v -- $@


.PHONY: lua.init
lua.init: init rm.init ${LUA_DST}
	sed '/fnl/d' < $< > init.lua

.PHONY: fnl.init
fnl.init: init.fnl.lua clean_lua rm.init
	ln -s $< init.lua

init.fnl.lua: init.fnl
	fennel --add-macro-path './fnl/?.fnl' -c $< >  $@

.PHONY: rm.init
rm.init:
	rm -f -- init.lua

.PHONY: clean_lua
clean_lua:
	@rm -vf  -- ${LUA_DST}
	@rm -vfd -- $(call reverse,${LUA_DIRS})

.PHONY: clean
clean: clean_lua rm.init
	rm -f -- init.fnl.lua