First iteration of the mconf tool for configuring the build (#2)

tools/mconf/src/mconf.c

@@ -0,0 +1,66 @@
+/*
+ * GNU Sparky --- A 5v5 character-based libre tactical shooter
+ * Copyright (C) 2024 Wasym A. Alonso
+ *
+ * This file is part of Sparky.
+ *
+ * Sparky 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Sparky 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 Sparky.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include <errno.h>
+#include <dialog.h>
+#include <sys/ioctl.h>
+
+#ifndef SK_VERSION
+#define SK_VERSION "v0.0-UNDEFINED"
+#endif
+#define CONFIG_FILE "config.mk"
+#define TITLE "Sparky " SK_VERSION " Build Configuration"
+#define PADDING_HEIGHT 8
+#define PADDING_WIDTH 7
+
+char *items[] = {
+  "D",     "Enable debug mode",                   "off",
+  "Q",     "Make the build output less verbose",  "on",
+  "Q_RSC", "Make the Rust compiler less verbose", "on"
+};
+
+int main(void) {
+  struct winsize term_winsize;
+  int status = 0, term_rows = 0, term_cols = 0;
+  if (ioctl(STDIN_FILENO, TIOCGWINSZ, &term_winsize) == -1) {
+    fprintf(stderr, "ERROR: unable to retrieve terminal's window size (%s)\n", strerror(errno));
+  }
+  term_rows = term_winsize.ws_row;
+  term_cols = term_winsize.ws_col;
+  init_dialog(stdin, stdout);
+  dialog_vars.backtitle = CONFIG_FILE " - " TITLE;
+  dialog_vars.ok_label = "Save";
+  dlg_put_backtitle();
+  status = dialog_checklist(TITLE,
+                            "Arrow keys navigate the menu.  <Space> toggles the options.",
+                            term_rows - PADDING_HEIGHT, term_cols - PADDING_WIDTH, 0,
+                            3,
+                            items,
+                            FLAG_CHECK);
+  end_dialog();
+  if (status) printf("\n\n\nYour configuration changes were NOT saved.\n\n");
+  else {
+    printf("\n\nconfiguration written to " CONFIG_FILE "\n\n");
+    printf("*** End of the configuration.\n");
+    printf("*** Execute 'make' to start the build or try 'make help'.\n\n");
+  }
+  return status;
+}