diff --git a/main.c b/main.c
index ac057ad..4291819 100644
--- a/main.c
+++ b/main.c
@@ -5,160 +5,195 @@
 
 NV_ID rootScope;
 
-void test()
-{
-	NV_ID nodeA = NV_Node_createWithString("A");
-	NV_ID nodeB = NV_Node_createWithString("B");
-	NV_ID nodeC = NV_Node_createWithString("C");
-	NV_ID nodeD = NV_Node_createWithString("D");
-	NV_ID nodeE = NV_Node_createWithString("E");
-	NV_NodeID_createRelation(&nodeA, &nodeB, &nodeC);
+void test() {
+  NV_ID nodeA = NV_Node_createWithString("A");
+  NV_ID nodeB = NV_Node_createWithString("B");
+  NV_ID nodeC = NV_Node_createWithString("C");
+  NV_ID nodeD = NV_Node_createWithString("D");
+  NV_ID nodeE = NV_Node_createWithString("E");
+  NV_NodeID_createRelation(&nodeA, &nodeB, &nodeC);
 
-	{
-		NV_ID r = NV_NodeID_getRelatedNodeFrom(&nodeA, &nodeB);
-		NV_NodeID_printForDebug(&r);
-		if(NV_NodeID_isEqual(&nodeC, &r)){
-			printf("OK");
-		} else{
-			printf("BAD");
-		}
-	}
+  {
+    NV_ID r = NV_NodeID_getRelatedNodeFrom(&nodeA, &nodeB);
+    NV_NodeID_printForDebug(&r);
+    if (NV_NodeID_isEqual(&nodeC, &r)) {
+      printf("OK");
+    } else {
+      printf("BAD");
+    }
+  }
 
-	NV_Dict_addUniqueIDKey(&nodeA, &nodeB, &nodeD);
-	{
-		NV_ID r = NV_NodeID_getRelatedNodeFrom(&nodeA, &nodeB);
-		NV_NodeID_printForDebug(&r);
-		if(NV_NodeID_isEqual(&nodeD, &r)){
-			printf("OK");
-		} else{
-			printf("BAD");
-		}
-	}
+  NV_Dict_addUniqueIDKey(&nodeA, &nodeB, &nodeD);
+  {
+    NV_ID r = NV_NodeID_getRelatedNodeFrom(&nodeA, &nodeB);
+    NV_NodeID_printForDebug(&r);
+    if (NV_NodeID_isEqual(&nodeD, &r)) {
+      printf("OK");
+    } else {
+      printf("BAD");
+    }
+  }
 
-	NV_Dict_addUniqueIDKey(&nodeA, &nodeB, &nodeE);
-	{
-		NV_ID r = NV_NodeID_getRelatedNodeFrom(&nodeA, &nodeB);
-		NV_NodeID_printForDebug(&r);
-		if(NV_NodeID_isEqual(&nodeE, &r)){
-			printf("OK");
-		} else{
-			printf("BAD");
-		}
-	}
-	{
-		NV_ID ary = NV_Array_create();
-		NV_ID nodeA = NV_Node_createWithString("A");
-		NV_ID nodeB = NV_Node_createWithString("B");
-		NV_Array_push(&ary, &nodeA);
-		NV_Array_push(&ary, &nodeB);
-		{
-			NV_ID r0 = NV_Array_getByIndex(&ary, 0);
-			NV_ID r1 = NV_Array_getByIndex(&ary, 1);
-			NV_NodeID_printForDebug(&r0);
-			NV_NodeID_printForDebug(&r1);
-			if(NV_NodeID_isEqual(&nodeA, &r0) && NV_NodeID_isEqual(&nodeB, &r1)){
-				printf("OK");
-			} else{
-				printf("BAD");
-			}
-		}
-		NV_Array_print(&ary);
-	}
-	exit(0);
+  NV_Dict_addUniqueIDKey(&nodeA, &nodeB, &nodeE);
+  {
+    NV_ID r = NV_NodeID_getRelatedNodeFrom(&nodeA, &nodeB);
+    NV_NodeID_printForDebug(&r);
+    if (NV_NodeID_isEqual(&nodeE, &r)) {
+      printf("OK");
+    } else {
+      printf("BAD");
+    }
+  }
+  {
+    NV_ID ary = NV_Array_create();
+    NV_ID nodeA = NV_Node_createWithString("A");
+    NV_ID nodeB = NV_Node_createWithString("B");
+    NV_Array_push(&ary, &nodeA);
+    NV_Array_push(&ary, &nodeB);
+    {
+      NV_ID r0 = NV_Array_getByIndex(&ary, 0);
+      NV_ID r1 = NV_Array_getByIndex(&ary, 1);
+      NV_NodeID_printForDebug(&r0);
+      NV_NodeID_printForDebug(&r1);
+      if (NV_NodeID_isEqual(&nodeA, &r0) && NV_NodeID_isEqual(&nodeB, &r1)) {
+        printf("OK");
+      } else {
+        printf("BAD");
+      }
+    }
+    NV_Array_print(&ary);
+  }
+  exit(0);
 }
 
-int main(int argc, char *argv[])
-{
-	NV_ID cTypeList, opDict;
-	int i;
-	char filename[MAX_TOKEN_LEN];
-	// set signal handler
-	if(signal(SIGINT, NV_signalHandler) == SIG_ERR) return 1;
-	//
-	printf(
-		"# nv interpreter\n"
-		"# repo:   https://github.com/hikalium/nv \n"
-		"# commit: %s\n"
-		"# date:   %s\n", 
-		GIT_COMMIT_ID, GIT_COMMIT_DATE
-	);
-	// read arguments
-	filename[0] = 0;
-	for(i = 1; i < argc; i++){
-		if(argv[i][0] == '-'){
-			if(argv[i][1] == 'v') NV_globalExecFlag |= NV_EXEC_FLAG_VERBOSE;
-			if(argv[i][1] == 'g') NV_globalExecFlag |= NV_EXEC_FLAG_SAVECODEGRAPH;
-			if(argv[i][1] == 's'){
-				i++;
-				NV_strncpy(filename, argv[i], MAX_TOKEN_LEN, strlen(argv[i]));
-			}
-		} else{
-			
-		}
-	}
-	//
-	NV_Node_initRoot();
-	//
-	/*
-	if(filename[0]){
-		// restore savedata
-		printf("Restoring from %s ...\n", filename);
-		FILE *fp = fopen(filename, "rb");
-		if(fp){
-			NV_Node_restoreFromFile(fp);
-			fclose(fp);
-			printf("done.\n");
-			//
-			NV_ID cl = NV_getContextList(); 
-			printf("%d contexts found.\n", NV_Array_count(&cl));
-		} else{
-			printf("fopen failed.\n");
-		}
-	}
-	*/
-	//
-	rootScope = NV_Node_createWithString("root");
-	//
-	NV_insertInitialNode();
-	NV_Dict_addUniqueEqKeyByCStr(&rootScope, "static", &NODEID_NV_STATIC_ROOT);
-	//
-	cTypeList = NV_Lang_createCharTypeList(NV_Lang02_charTypeList);
-	NV_Dict_addUniqueEqKeyByCStr(&rootScope, "cTypeList", &cTypeList);
-	//
-	opDict = NV_Lang_createOpDict(NV_Lang02_opList);
-	NV_Dict_addUniqueEqKeyByCStr(&rootScope, "opDict", &opDict);
-	//
-	/*
-	NV_globalExecFlag |= NV_EXEC_FLAG_INTERACTIVE;
-	NV_evalLine(&cTypeList, &ctx, 
-			"loop={for{#args[0]=args[1]}{#args[0]<=args[2]}{#args[0]++}{args[3]()}}"); 
-	*/
+#define MAX_FILE_NAME_LEN 128
+typedef struct {
+  char filePath[MAX_FILE_NAME_LEN];
+  char dbPath[MAX_FILE_NAME_LEN];
+} NV_Args;
 
-	//test();
-
-	char line[MAX_INPUT_LEN];
-	//
-	while(NV_gets(line, sizeof(line)) != NULL){
-		NV_ID tokenList = NV_tokenize(&cTypeList, line);
-		NV_Dict_addUniqueEqKeyByCStr(&rootScope, "currentTokenList", &tokenList);
-		//
-		NV_ID codeGraphRoot = 
-			NV_Lang_parseToCodeGraph(&tokenList, &opDict, NV_Lang02_funcList);
-		NV_Dict_addUniqueEqKeyByCStr(&rootScope, "currentCodeGraph", &codeGraphRoot);
-		//
-		NV_ID result = NV_evalGraph(&codeGraphRoot, &rootScope, NV_Lang02_evalList);
-		//
-		if(!(NV_globalExecFlag & NV_EXEC_FLAG_SUPRESS_AUTOPRINT)){
-			printf(" = ");
-			NV_ID prim = NV_Term_getPrimNodeID(&result, &rootScope);
-			NV_Term_print(&prim);
-			printf("\n");
-		} else{
-			NV_globalExecFlag &= ~NV_EXEC_FLAG_SUPRESS_AUTOPRINT;
-		}
-	}
-	//
-	return 0;
+void Internal_ParseArgument(NV_Args *args, int argc, char *argv[]) {
+  args->filePath[0] = 0;
+  args->dbPath[0] = 0;
+  for (int i = 1; i < argc; i++) {
+    if (argv[i][0] == '-') {
+      if (argv[i][1] == 'v') {
+        NV_globalExecFlag |= NV_EXEC_FLAG_VERBOSE;
+      }
+      if (argv[i][1] == 'g') {
+        NV_globalExecFlag |= NV_EXEC_FLAG_SAVECODEGRAPH;
+      }
+      if (argv[i][1] == 's') {
+        i++;
+        NV_strncpy(args->dbPath, argv[i], MAX_FILE_NAME_LEN, strlen(argv[i]));
+      }
+    } else {
+      NV_strncpy(args->filePath, argv[i], MAX_FILE_NAME_LEN, strlen(argv[i]));
+    }
+  }
 }
 
+int main(int argc, char *argv[]) {
+  NV_ID cTypeList, opDict;
+  // set signal handler
+  if (signal(SIGINT, NV_signalHandler) == SIG_ERR) return 1;
+  //
+  printf(
+      "# nv interpreter\n"
+      "# repo:   https://github.com/hikalium/nv \n"
+      "# commit: %s\n"
+      "# date:   %s\n",
+      GIT_COMMIT_ID, GIT_COMMIT_DATE);
+  //
+  NV_Args *args = NV_malloc(sizeof(NV_Args));
+  Internal_ParseArgument(args, argc, argv);
+  NV_Node_initRoot();
+  //
+  /*
+  if(filename[0]){
+          // restore savedata
+          printf("Restoring from %s ...\n", filename);
+          FILE *fp = fopen(filename, "rb");
+          if(fp){
+                  NV_Node_restoreFromFile(fp);
+                  fclose(fp);
+                  printf("done.\n");
+                  //
+                  NV_ID cl = NV_getContextList();
+                  printf("%d contexts found.\n", NV_Array_count(&cl));
+          } else{
+                  printf("fopen failed.\n");
+          }
+  }
+  */
+  //
+  rootScope = NV_Node_createWithString("root");
+  //
+  NV_insertInitialNode();
+  NV_Dict_addUniqueEqKeyByCStr(&rootScope, "static", &NODEID_NV_STATIC_ROOT);
+  //
+  cTypeList = NV_Lang_createCharTypeList(NV_Lang02_charTypeList);
+  NV_Dict_addUniqueEqKeyByCStr(&rootScope, "cTypeList", &cTypeList);
+  //
+  opDict = NV_Lang_createOpDict(NV_Lang02_opList);
+  NV_Dict_addUniqueEqKeyByCStr(&rootScope, "opDict", &opDict);
+  //
+  /*
+  NV_globalExecFlag |= NV_EXEC_FLAG_INTERACTIVE;
+  NV_evalLine(&cTypeList, &ctx,
+                  "loop={for{#args[0]=args[1]}{#args[0]<=args[2]}{#args[0]++}{args[3]()}}");
+  */
+
+  if (args->filePath[0]) {
+    FILE *fp = fopen(args->filePath, "rb");
+    char *buf = NV_malloc(4096 * 1024);
+    fread(buf, 1, 4096 * 1024, fp);
+    NV_ID tokenList = NV_tokenize(&cTypeList, buf);
+    NV_Dict_addUniqueEqKeyByCStr(&rootScope, "currentTokenList", &tokenList);
+    //
+    NV_ID codeGraphRoot =
+        NV_Lang_parseToCodeGraph(&tokenList, &opDict, NV_Lang02_funcList);
+    NV_Dict_addUniqueEqKeyByCStr(&rootScope, "currentCodeGraph",
+                                 &codeGraphRoot);
+    //
+    NV_ID result = NV_evalGraph(&codeGraphRoot, &rootScope, NV_Lang02_evalList);
+    //
+    if (!(NV_globalExecFlag & NV_EXEC_FLAG_SUPRESS_AUTOPRINT)) {
+      printf(" = ");
+      NV_ID prim = NV_Term_getPrimNodeID(&result, &rootScope);
+      NV_Term_print(&prim);
+      printf("\n");
+    } else {
+      NV_globalExecFlag &= ~NV_EXEC_FLAG_SUPRESS_AUTOPRINT;
+    }
+
+  } else {
+    char line[MAX_INPUT_LEN];
+    //
+    while (NV_gets(line, sizeof(line)) != NULL) {
+      NV_ID tokenList = NV_tokenize(&cTypeList, line);
+      NV_Dict_addUniqueEqKeyByCStr(&rootScope, "currentTokenList", &tokenList);
+      //
+      NV_ID codeGraphRoot =
+          NV_Lang_parseToCodeGraph(&tokenList, &opDict, NV_Lang02_funcList);
+      NV_Dict_addUniqueEqKeyByCStr(&rootScope, "currentCodeGraph",
+                                   &codeGraphRoot);
+      //
+      NV_ID result =
+          NV_evalGraph(&codeGraphRoot, &rootScope, NV_Lang02_evalList);
+      //
+      if (!(NV_globalExecFlag & NV_EXEC_FLAG_SUPRESS_AUTOPRINT)) {
+        printf(" = ");
+        NV_ID prim = NV_Term_getPrimNodeID(&result, &rootScope);
+        NV_Term_print(&prim);
+        printf("\n");
+      } else {
+        NV_globalExecFlag &= ~NV_EXEC_FLAG_SUPRESS_AUTOPRINT;
+      }
+    }
+  }
+
+  //
+  return 0;
+}
 
diff --git a/nv.h b/nv.h
index 5a2683e..f341f00 100644
--- a/nv.h
+++ b/nv.h
@@ -7,6 +7,13 @@
 #include <string.h>
 #include <time.h>
 
+#ifndef GIT_COMMIT_ID
+#define GIT_COMMIT_ID "undefined"
+#endif
+#ifndef GIT_COMMIT_DATE
+#define GIT_COMMIT_DATE "undefined"
+#endif
+
 #define MAX_INPUT_LEN 1024
 #define MAX_TOKEN_LEN 256
 #define MAX_SAVE_DATA_ENTRY_SIZE 4096