Makefile

# Author: Eric Pruitt (https://www.codevat.com)
# License: 2-Clause BSD (http://opensource.org/licenses/BSD-2-Clause)
.POSIX:
.SILENT: test-all test-corpora test-width-data wcwidth.awk

AWK = awk
AWKS = \
	"busybox awk" \
	"env LC_ALL=C gawk --posix" \
	"gawk" \
	"mawk" \
	"original-awk" \

all: test

width-data: generate-width-data.c
	$(CC) -o $(<:.c=) $< && ./$(<:.c=) > $@

clean:
	rm -f generate-width-data

wcwidth.awk: template.awk width-data
	insert=$$( \
		grep -v "^-1 " width-data \
		| tr "\n" "," \
		| fold -w 71 \
		| sed -e 's/^.*$$/    "\0" \\\\/' -e '$$s/," \\\\$$/"/' \
	) && \
	$(AWK) -v insert="$$insert" ' \
		/^[ \t]*#.*\[WIDTH DATA\]/ { \
			print insert; \
			next; \
		} \
		{ \
			print; \
		} \
	' template.awk > $@.tmp
	mv $@.tmp $@
	echo "$@: file generated succesfully"

test-all test-corpora test-width-data: wcwidth.awk
	fallback="$(AWK)" && \
	for awk in $(AWKS); do \
		if ! $$awk "BEGIN { exit }" 2>/dev/null; then \
			test "$$fallback" && awk="$$fallback" || continue; \
		fi; \
		fallback=""; \
		using="$$awk -f wcwidth.awk -f test.awk"; \
		printf "%s:\n" "$$awk"; \
		if [ "$@" = "test-all" ] || [ "$@" = "test-width-data" ]; then \
			name="width data invariance"; \
			test "$@" = "test-all" || name="sanity check"; \
			printf "\055 %s: " "$$name"; \
			$$using -v TERSE=1 width-data:width-data; \
			echo "OK"; \
		fi; \
		if [ "$@" = "test-all" ] || [ "$@" = "test-corpora" ]; then \
			for path in test-data/*-corpus.text; do \
				printf "\055 %s: " "$$path"; \
				$$using -v TERSE=1 "$$path"; \
				echo "OK"; \
			done; \
		fi; \
	done

test: test-width-data