Add help flag and usage to UNIX Jerry standalone.

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai@inf.u-szeged.hu

Author: dbatyai

main-unix.c

@@ -188,6 +188,27 @@ assert_handler (const jerry_api_object_t *function_obj_p __attr_unused___, /** <
   }
 } /* assert_handler */
 
+static void
+print_usage ()
+{
+  printf ("Usage: ./jerry [flags] [js-file ...]\n"
+          "\n"
+          "Flags:\n"
+          "  -h, --help\n"
+          "  -v, --version\n"
+          "  --mem-stats\n"
+          "  --mem-stats-separate\n"
+          "  --parse-only\n"
+          "  --show-opcodes\n"
+          "  --save-snapshot-for-global $output_file\n"
+          "  --save-snapshot-for-eval $output_file\n"
+          "  --exec-snapshot $input_file\n"
+          "  --log-level [0-3]\n"
+          "  --log-file $output_file\n"
+          "  --abort-on-fail\n"
+          "\n");
+} /* print_usage */
+
 int
 main (int argc,
       char **argv)
@@ -199,6 +220,11 @@ main (int argc,
 
     return JERRY_STANDALONE_EXIT_CODE_FAIL;
   }
+  else if (argc < 2)
+  {
+    print_usage ();
+    return JERRY_STANDALONE_EXIT_CODE_FAIL;
+  }
 
   const char *file_names[JERRY_MAX_COMMAND_LINE_ARGS];
   int i;
@@ -226,12 +252,18 @@ main (int argc,
 #endif /* JERRY_ENABLE_LOG */
   for (i = 1; i < argc; i++)
   {
-    if (!strcmp ("-v", argv[i]))
+    if (!strcmp ("-h", argv[i]) || !strcmp ("--help", argv[i]))
+    {
+      print_usage ();
+      return JERRY_STANDALONE_EXIT_CODE_OK;
+    }
+    if (!strcmp ("-v", argv[i]) || !strcmp ("--version", argv[i]))
     {
       printf ("Build date: \t%s\n", jerry_build_date);
       printf ("Commit hash:\t%s\n", jerry_commit_hash);
       printf ("Branch name:\t%s\n", jerry_branch_name);
       printf ("\n");
+      return JERRY_STANDALONE_EXIT_CODE_OK;
     }
     else if (!strcmp ("--mem-stats", argv[i]))
     {
@@ -265,6 +297,7 @@ main (int argc,
       else
       {
         JERRY_ERROR_MSG ("Error: wrong format of the arguments\n");
+        print_usage ();
         return JERRY_STANDALONE_EXIT_CODE_FAIL;
       }
     }
@@ -278,6 +311,7 @@ main (int argc,
       else
       {
         JERRY_ERROR_MSG ("Error: wrong format of the arguments\n");
+        print_usage ();
         return JERRY_STANDALONE_EXIT_CODE_FAIL;
       }
     }
@@ -308,13 +342,19 @@ main (int argc,
       else
       {
         JERRY_ERROR_MSG ("Error: wrong format of the arguments\n");
+        print_usage ();
         return JERRY_STANDALONE_EXIT_CODE_FAIL;
       }
     }
     else if (!strcmp ("--abort-on-fail", argv[i]))
     {
       flags |= JERRY_FLAG_ABORT_ON_FAIL;
     }
+    else if (!strncmp ("-", argv[i], 1))
+    {
+      print_usage ();
+      return JERRY_STANDALONE_EXIT_CODE_FAIL;
+    }
     else
     {
       file_names[files_counter++] = argv[i];