src->vm, Makefile is now a bit more abstracted and pretty colours

Changed folder names for sake of clarity (will be introducing a new
build target soon), and Makefile can now easily support more targets.

vm/main.c

@@ -0,0 +1,62 @@
+/* Copyright (C) 2023 Aryadev Chavali
+
+ * You may distribute and modify this code under the terms of the
+ * GPLv2 license.  You should have received a copy of the GPLv2
+ * license with this file.  If not, please write to:
+ * aryadev@aryadevchavali.com.
+
+ * Created: 2023-10-15
+ * Author: Aryadev Chavali
+ * Description: Entrypoint to program
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "./inst.h"
+#include "./runtime.h"
+
+int interpret_bytecode(const char *filepath)
+{
+  FILE *fp             = fopen(filepath, "rb");
+  size_t number        = 0;
+  inst_t *instructions = insts_read_bytecode_file(fp, &number);
+  fclose(fp);
+
+  byte stack[256];
+  vm_t vm = {0};
+  vm_load_stack(&vm, stack, ARR_SIZE(stack));
+  vm_load_program(&vm, instructions, number);
+  err_t err = vm_execute_all(&vm);
+
+  int ret = 0;
+  if (err)
+  {
+    const char *error_str = err_as_cstr(err);
+    fprintf(stderr, "[ERROR]: %s\n", error_str);
+    vm_print_all(&vm, stderr);
+    ret = 255 - err;
+  }
+  free(instructions);
+  return ret;
+}
+
+int assemble_instructions(inst_t *instructions, size_t number,
+                          const char *filepath)
+{
+  FILE *fp = fopen(filepath, "wb");
+  insts_write_bytecode_file(instructions, number, fp);
+  fclose(fp);
+  return 0;
+}
+
+int main(int argc, char *argv[])
+{
+  const char *filename = "out.bin";
+  if (argc >= 2)
+    filename = argv[1];
+  inst_t instructions[] = {INST_HALT};
+  assemble_instructions(instructions, ARR_SIZE(instructions), filename);
+  return interpret_bytecode(filename);
+}