add a proper CLI

featuring skip order (left/right) and pause (space)!
currently available on macOS and Linux only.

src/cli/cli.h

@@ -0,0 +1,55 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _FUR_CLI_H
+#define _FUR_CLI_H
+
+#include <stdio.h>
+#ifdef _WIN32
+#include <windows.h>
+#else
+#include <signal.h>
+#include <unistd.h>
+#include <termios.h>
+#include <sys/ioctl.h>
+#endif
+
+#include "../engine/engine.h"
+
+class FurnaceCLI {
+  DivEngine* e;
+
+#ifdef _WIN32
+  HANDLE winin;
+  HANDLE winout;
+#else
+  struct sigaction intsa;
+  struct termios termprop;
+  struct termios termpropold;
+#endif
+
+  public:
+    void bindEngine(DivEngine* eng);
+    bool loop();
+    bool finish();
+    bool init();
+    FurnaceCLI();
+};
+
+#endif