Refactored arguments

include/cmd/args/arg_input.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <string>
+#include <sstream>
+
+#include "cmd/args/arg_base.hpp"
+
+namespace fsh{
+
+class ArgInput : public _Argument {
+public:
+    static std::istream& get(std::shared_ptr<_Argument> a) {
+        return std::dynamic_pointer_cast<ArgInput>(a)->gvalue();
+    }
+
+    ArgInput() {} 
+
+    virtual void svalue(const std::string& val, const Lexer::TokenType& type) override;
+    virtual std::istream& gvalue();
+
+private:
+    std::optional<std::stringstream> str;
+    std::optional<std::ifstream> file;
+};
+
+}