MAKEFLAGS += --warn-undefined-variables

install_path    = /usr/local/bin
links_path      = ~/.shellrc/bin/scripts
local_man_path  = ~/.shellrc/var/man/man1
system_man_path = /usr/local/share/man/man1

SRC := scripts
MAN := man

find := $(shell { command -v gfind || command -v find; } 2>&-)

SCRIPTS   := $(wildcard $(SRC)/kubectl-*)
MAN_PAGES := $(subst $(SRC),$(MAN),$(basename $(wildcard $(SRC)/kubectl-*)))
MAN_FILES := $(addsuffix ".1", $(MAN_PAGES))

# --------------------------------------------------------------------------------------------------

# install_files [FILES] TO/
define install_files
	@for file in $(1); do \
		echo install -m $(3) $$(realpath -- $$file) $(2)/$$(basename $$file); \
		install -m $(3) $$(realpath -- $$file) $(2)/$$(basename $$file); \
	done
endef

# link_files [FILES] TO/
define link_files
	@for file in $(1); do \
		ln -f -s -v $$(realpath -- $$file) $(2)/$$(basename $$file); \
	done
endef

# delete_files [FILES] FROM/
define delete_files
	@for file in $(1); do \
		rm -v $(2)/$$(basename $$file) || :; \
	done
endef

# --------------------------------------------------------------------------------------------------

help: ## Display this help.
	@awk 'BEGIN { \
		FS = ":.*##"; \
		printf "\nUsage:\n  make \033[36m<target>\033[0m\n\nTargets:\n" \
	} \
	/^[a-zA-Z_-]+:.*?##/ { \
		printf "  \033[36m%-10s\033[0m %s\n", $$1, $$2 \
	} \
	END { \
		print \
	}' \
	$(MAKEFILE_LIST)

# --------------------------------------------------------------------------------------------------

man:       $(MAN_PAGES)                                             ## Generate man pages.
links:     make_local_dirs make_links link_man_pages            ## Install kubectl scripts by creating links.
install:   copy_bin copy_man_pages                              ## Install kubectl scripts to /usr/local/bin.
uninstall: rm_bin rm_links rm_man_pages rm_man_links rm_local_dirs  ## Uninstall kubectl scripts.

# --------------------------------------------------------------------------------------------------

%: $(BIN)/%
$(MAN)/%: $(SRC)/%
	pod2man --section 1 --release "1.0.0" --center "KUBECTL EXTENSIONS" $< > $@.1

# --------------------------------------------------------------------------------------------------

make_man_directory:
	@mkdir -p $(system_man_path)

copy_bin:
	$(call install_files, $(SCRIPTS), $(install_path), 755)

rm_bin:
	$(call delete_files, $(SCRIPTS), $(install_path))

copy_man_pages: make_man_directory
	$(call install_files, $(MAN_FILES), $(system_man_path), 644)

rm_man_pages: make_man_directory
	$(call delete_files, $(MAN_FILES), $(system_man_path))

# --------------------------------------------------------------------------------------------------

make_local_dirs:
	mkdir -p -v $(links_path)
	mkdir -p -v $(local_man_path)

rm_local_dirs:
	rmdir $(links_path) 2>&-; :
	rmdir $(local_man_path) 2>&-; :

make_links:
	$(call link_files, $(SCRIPTS), $(links_path))

rm_links:
	$(call delete_files, $(SCRIPTS), $(links_path))

link_man_pages:
	$(call link_files, $(MAN_FILES), $(local_man_path))

rm_man_links:
	$(call delete_files, $(MAN_FILES), $(local_man_path))

# --------------------------------------------------------------------------------------------------

.PHONY: all make_local_dirs rm_local_dirs links install uninstall