test/run_input, ...: RAII-style global initialization

test/visit_archive.cxx

@@ -35,8 +35,29 @@
 #include <stdlib.h>
 #include <stdio.h>
 
+class GlobalInit {
+	const ScopeIOThread io_thread;
+
+public:
+	GlobalInit() {
+		config_global_init();
+#ifdef ENABLE_ARCHIVE
+		archive_plugin_init_all();
+#endif
+		input_stream_global_init();
+	}
+
+	~GlobalInit() {
+		input_stream_global_finish();
+#ifdef ENABLE_ARCHIVE
+		archive_plugin_deinit_all();
+#endif
+		config_global_finish();
+	}
+};
+
 class MyArchiveVisitor final : public ArchiveVisitor {
- public:
+public:
 	virtual void VisitArchiveEntry(const char *path_utf8) override {
 		printf("%s\n", path_utf8);
 	}
@@ -55,13 +76,7 @@ try {
 
 	/* initialize MPD */
 
-	config_global_init();
-
-	const ScopeIOThread io_thread;
-
-	archive_plugin_init_all();
-
-	input_stream_global_init();
+	const GlobalInit init;
 
 	/* open the archive and dump it */
 
@@ -79,14 +94,6 @@ try {
 	file->Visit(visitor);
 	file->Close();
 
-	/* deinitialize everything */
-
-	input_stream_global_finish();
-
-	archive_plugin_deinit_all();
-
-	config_global_finish();
-
 	return result;
 } catch (const std::exception &e) {
 	LogError(e);