worst makefile ever (not clickbait)

Makefile

.ONESHELL:
SHELL = bash
override PARTS := backend frontend

override PREFIX.INTERNAL := _______
override GO := go
override DOCKER := docker
override REPO := xxx
override REGISTRY := xxx.xxx.xxx
override IMAGE_NAME := $(REGISTRY)/$(REPO)
override DOCKER_BASE_BUILD_ARGS := --build-context root=${CURDIR} --progress=plain

override BACKEND.SUBDIRS := $(shell find backend -type d)
override BACKEND.ROUTE_DIRS := $(shell find backend/routes/api -type d)
override BACKEND.SRC := $(foreach dir,$(BACKEND.SUBDIRS),$(wildcard $(dir)/*.go))
override BACKEND.ROUTES_SRC := $(foreach dir,$(BACKEND.ROUTE_DIRS),$(wildcard $(dir)/*.go))
override BACKEND.BASE_FLAGS := -tags 'goexperiment.jsonv2'


override backend := $(BACKEND.SRC)
override frontend := $(PREFIX.INTERNAL)zod-defs
override zod_defs := $(PREFIX.INTERNAL)openapi-spec
override openapi_spec := $(BACKEND.ROUTES_SRC)
override frontend_image := $(PREFIX.INTERNAL)frontend
override backend_image := $(BACKEND.SRC)
override push := $(PREFIX.INTERNAL)backend-image $(PREFIX.INTERNAL)frontend-image



define GET_RULE_TYPE
$(strip $(shell if [[ "$(strip $(1))" =~ ^(openapi|zod) ]]; then echo "frontend/"; elif [[ "$(1)" =~ (image$$|push) ]]; then echo "docker/"; fi))
endef

define FAKE_DEP
$(strip .artifacts/$(strip $(call GET_RULE_TYPE,$(strip $(1))))$(strip $(1)).make-evidence)
endef

define STRIP_PREFIX
$(strip $(shell echo $(1) | sed 's/^$(PREFIX.INTERNAL)//'))
endef

define FACADE
$(call FAKE_DEP,$(call STRIP_PREFIX,$(1))): $(foreach el,$($(subst -,_,$(call STRIP_PREFIX,$(1)))),$(if $(call IS_TARGET,$(el)),$(call FAKE_DEP,$(call STRIP_PREFIX,$(el))),$(el)))
	$(MAKE) -f Makefile.fucked $(1)
	mkdir -p $$(dir $$@) || true
	@echo $$@
	touch $$@

$(call STRIP_PREFIX,$(1)): $(call FAKE_DEP,$(call STRIP_PREFIX,$(1)))
	

endef

define IS_TARGET
$(if $(findstring $(PREFIX.INTERNAL),$(1)),true,)
endef
define CREATE_IMAGE_BUILD_CMD
$(DOCKER) build $(DOCKER_BASE_BUILD_ARGS) -f $(call STRIP_PREFIX,$(1))/Dockerfile -t ${IMAGE_NAME}/$(call STRIP_PREFIX,$(1)):latest -t ${IMAGE_NAME}/$(call STRIP_PREFIX,$(1)):snapshot-$(shell date +'%s') . ;
endef


.PHONY: help

help:
	echo there''s no help, there''s no hope...

### actual targets ###
$(PREFIX.INTERNAL)backend:
	cd backend; \
	mkdir -p ./bin; \
	go build $(BACKEND.BASE_FLAGS) -o ./bin/main.exe .

$(PREFIX.INTERNAL)frontend:
	@echo -n

$(PREFIX.INTERNAL)openapi-spec:
	cd backend; \
	go run $(BACKEND.BASE_FLAGS) . .. oapi-spec.json; \
	cd ..; \
	mv -f oapi-spec.json frontend/

$(PREFIX.INTERNAL)zod-defs:
	bun frontend/scripts/generate-zod-bodies.ts


### docker ###
$(PARTS:%=prune-%): prune-%:
	python tools/registry.py -r https://$(REGISTRY) -i celtrackr/$* --delete --num 10

$(PREFIX.INTERNAL)frontend-image:
	$(call CREATE_IMAGE_BUILD_CMD,frontend,$@)

$(PREFIX.INTERNAL)backend-image:
	$(call CREATE_IMAGE_BUILD_CMD,backend,$@)


$(PREFIX.INTERNAL)push:
	$(DOCKER) push --all-tags $(IMAGE_NAME)/frontend
	$(DOCKER) push --all-tags $(IMAGE_NAME)/backend

### shit ###

%.go: .artifacts/%.make-evidence
	$(shell echo -n)

.artifacts/%.make-evidence:
	mkdir -p $(dir $@) || true
	@echo $@
	touch $@

ifndef $(LOWER)
$(info hi)
override els := $(shell LOWER="LOWER" make -f Makefile.fucked -qp | awk -F':' '/^[a-zA-Z0-9_][^$#\/\t=]*:([^=]|$$)/ {split($$1,A,/ /);for(i in A)print A[i]}' | grep -Ei '^__' | sort -u)
$(foreach el,$(els),$(eval $(call FACADE,$(el))))
endif