SRCS = $(wildcard *.html *.xml *.txt *.css *.map *.pdf)

ZSTD = $(patsubst %,%.zst,$(SRCS))
BR = $(patsubst %,%.br,$(SRCS))
GZ = $(patsubst %,%.gz,$(SRCS))

.PHONY: all
all: $(ZSTD) $(BR) $(GZ)

.SECONDARY:

%.br: %.xxhash
	brotli -f $*

%.zst: %.xxhash
	zstd -f -19 $*

%.gz: %.xxhash
	zopfli $*

# https://github.com/gohugoio/hugo/issues/10842
%.xxhash: %
	current=$$(xxhsum $< | cut -d' ' -f1); \
	if [ ! -f $< ] || [ "$$(cat $@ 2>/dev/null)" != "$$current" ]; then \
		echo "$$current" > $@; \
	fi