practically the whole thing up and running. I should make commits more often...

src/run.c

@@ -0,0 +1,30 @@
+#include "../include/run.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int get_build_status() {
+  FILE *fd = fopen("./build/.build_status", "r");
+  if (!fd) {
+    fprintf(stderr, "Build the project before running it.\n");
+    exit(1);
+  }
+
+  int i;
+  fscanf(fd, "%d", &i);
+
+  fclose(fd);
+
+  return i; // max 10 codes (so far only 2 => 0 -> success, 1 -> failure)
+}
+
+void run_project() {
+  if (get_build_status() == 0) { // success
+    // file exists => project has been built
+    system("make run");
+  } else {
+    // file does not exist => project has not been built
+    printf("Project not yet built. Build it first with 'vendetta build'.\n");
+    exit(1);
+  }
+}