makedev improve and CI badge

.gitignore

@@ -24,3 +24,4 @@ configure
 src/margen*
 *.pkg.tar.zst
 pkg
+margen-*

Makefile.dev

@@ -24,12 +24,30 @@ valgrind: build
 	valgrind --leak-check=full -s ./build/$(TARGET) $(TEST_ARGS)
 
 .PHONY: release
-release:
+release: clean
 	aclocal
 	autoconf
 	automake --add-missing
 	./configure
 	make distcheck
+	mkdir -p build
+	cp $(TARGET)-*.tar.gz build
+	@rm -rf \
+		autom4te.cache \
+		aclocal.m4 \
+		compile \
+		config.* \
+		configure \
+		depcomp \
+		$(TARGET) \
+		$(TARGET)-*.tar.gz \
+		$(TARGET)-*.pkg.tar.zst \
+		install-sh \
+		Makefile \
+		Makefile.in \
+		missing \
+		src/.* \
+		src/*.o \
 
 .PHONY: release-arch
 release-arch: clean

README.md

@@ -1,3 +1,5 @@
+[![C-lang CI](https://github.com/klemek/margen/actions/workflows/ci.yml/badge.svg)](https://github.com/klemek/margen/actions/workflows/ci.yml)
+
 # margen
 
 > generate a marble-like pattern bitmap image, blazing fast.

src/args.c

@@ -48,12 +48,12 @@ void print_help(int status_code) {
 
 void invalid_arg(char *arg) {
   fprintf(stderr, "invalid argument: '%s'\n\n", arg);
-  print_help(1);
+  print_help(EXIT_FAILURE);
 }
 
 void invalid_value(char *arg, char *value) {
   fprintf(stderr, "invalid value for argument '%s': '%s'\n\n", arg, value);
-  print_help(1);
+  print_help(EXIT_FAILURE);
 }
 
 bool is_arg(char *arg, char *ref) { return strcoll(arg, ref) == 0; }