Better Code orgnization

src/alias.hpp

@@ -0,0 +1,7 @@
+#include <nlohmann/json.hpp>
+#include <vector>
+
+// common / frequently used type-alias here
+
+using json = nlohmann::json;
+using StrVec = std::vector<std::string>;

src/encoding.hpp

@@ -0,0 +1,39 @@
+#pragma once
+
+#ifdef _WIN32
+#include <Windows.h>
+#endif
+#include <string>
+
+namespace encoding {
+
+#ifdef _WIN32
+inline std::string ansi2utf8(const std::string &str) {
+  int wCharLen = MultiByteToWideChar(CP_ACP, 0, str.c_str(), -1, 0, 0);
+  if (wCharLen == 0)
+    return "";
+  wchar_t *wStr = new wchar_t[wCharLen];
+  MultiByteToWideChar(CP_ACP, 0, str.c_str(), -1, wStr, wCharLen);
+  int utf8Len = WideCharToMultiByte(CP_UTF8, 0, wStr, -1, 0, 0, 0, 0);
+  if (utf8Len == 0) {
+    delete[] wStr;
+    return "";
+  }
+  char *utf8Str = new char[utf8Len];
+  WideCharToMultiByte(CP_UTF8, 0, wStr, -1, utf8Str, utf8Len, 0, 0);
+  std::string result(utf8Str);
+  delete[] wStr;
+  delete[] utf8Str;
+  return result;
+}
+#endif
+
+inline std::string platform_str(const std::string &str) {
+#ifdef _WIN32
+  return ansi2utf8(str);
+#else
+  return str;
+#endif
+}
+
+} // namespace encoding

src/json.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+#include "alias.hpp"
+#include <fstream>
+#include <string_view>
+
+namespace jsonutils {
+
+inline json load_from_file(std::string_view filename) {
+  std::ifstream fin(filename.data());
+  if (!fin) {
+    return json();
+  }
+  return std::move(json::parse(fin));
+}
+
+inline void save_to_file(const json &obj, std::string_view filename) {
+  std::ofstream fout(filename.data());
+  if (!fout.good()) {
+    return;
+  }
+  fout << obj.dump(4);
+  fout.close();
+}
+
+} // namespace jsonutils