grammar.py and friends: Make test/grammar compile and start

Doesn't successfully parse grammartest.code, yet, it errors out with a
syntax error on whitespace. But at least it compiles and starts.

Signed-off-by: Jan Lindemann <jan@janware.com>

test/grammar/main.cpp

@@ -0,0 +1,44 @@
+#include <string>
+
+#include <stdio.h>
+
+#include <misc.h>
+#include <slog.h>
+#include <YMisc.h>
+
+// TODO: this should be included from grammartest.tab.h automatically
+#include "include/grammartest.h"
+
+#include "include/defs.h"
+#include "include/grammartest.tab.h"
+
+using namespace std;
+
+int main(int argc, const char *argv[])
+{
+	if (argc < 2) {
+		fprintf(stderr, "usage: %s input-file\n", filenotdir(argv[0]));
+		return 1;
+	}
+
+	const char *path = argv[1];
+	string content;
+	if (YMisc::suck_in_file(path, content)<0) {
+		slog(PRI_ERR, "failed to read [%s] (%s)", path, err());
+		return 1;
+	}
+
+	struct context context = {
+		line: 0
+	};
+
+	struct vp_scanner *scanner = FB_SYM(init_scanner)(content.c_str());
+	int status = FB_SYM(parse)(&context, FB_SYM(scanner_get_data)(scanner));
+	FB_SYM(cleanup_scanner)(scanner);
+	if (status) {
+		slog(PRI_ERR, "failed to parse [%s] (%s)", path, err());
+		return -1;
+	}
+
+	return 0;
+}