Makefile

YEAR = $(shell date '+%Y')
DAY  = $(shell date '+%d')

META_TITLE = YOUR TITLE GOES HERE
META_YEAR = $(YEAR)
META_DAY = $(subst S,,$(subst S0,,S$(DAY)))
META_URL = https://adventofcode.com/$(META_YEAR)/day/$(META_DAY)

FILE_PART_ONE = part-1.js
FILE_PART_TWO = part-2.js
FILE_README = README.md

TEMPLATE_DIRECTORY = _templates/
TEMPLATE_FILE_README = $(TEMPLATE_DIRECTORY)$(FILE_README)
TEMPLATE_FILE_PART_ONE = $(TEMPLATE_DIRECTORY)$(FILE_PART_ONE)
TEMPLATE_FILE_PART_TWO = $(TEMPLATE_DIRECTORY)$(FILE_PART_TWO)

OUTPUT_DIRECTORY = $(YEAR)/$(DAY)/
OUTPUT_FILE_README = $(OUTPUT_DIRECTORY)$(FILE_README)
OUTPUT_FILE_PART_ONE = $(OUTPUT_DIRECTORY)$(FILE_PART_ONE)
OUTPUT_FILE_PART_TWO = $(OUTPUT_DIRECTORY)$(FILE_PART_TWO)

IDE = code

GITHUB_URL = $(subst git@,https://,$(subst :,/,$(shell git remote get-url origin)))

all: $(OUTPUT_FILE_README) $(OUTPUT_FILE_PART_ONE) $(OUTPUT_FILE_PART_TWO)

$(OUTPUT_FILE_README): $(TEMPLATE_FILE_README)
	mkdir -p $(OUTPUT_DIRECTORY)
	cp $^ $@
	sed -i -e 's/{YEAR}/$(META_YEAR)/g' -e 's/{DAY}/$(META_DAY)/g' -e 's/{TITLE}/$(META_TITLE)/g' -e 's$${URL}$$$(META_URL)$$g' $@

$(OUTPUT_FILE_PART_ONE): $(TEMPLATE_FILE_PART_ONE)
	cp $^ $@;

$(OUTPUT_FILE_PART_TWO): $(TEMPLATE_FILE_PART_TWO)
	cp $^ $@;

.PHONY: url
url:
	@echo $(META_URL)

.PHONY: open
open:
	open $(META_URL)

.PHONY: clean
clean:
	rm -rf $(OUTPUT_DIRECTORY)

.PHONY: ide
ide:
	$(IDE) . &

.PHONY: gh
gh:
	open $(GITHUB_URL)