New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/base/file_name_utils.hpp

@@ -0,0 +1,57 @@
+#pragma once
+
+#include <string>
+#include <utility>
+
+#include "base/assert.hpp"
+
+namespace base
+{
+/// Remove extension from file name.
+void GetNameWithoutExt(std::string & name);
+std::string FilenameWithoutExt(std::string name);
+/// @return File extension with the dot or empty std::string if no extension found.
+std::string GetFileExtension(std::string const & name);
+
+/// Get file name from full path.
+void GetNameFromFullPath(std::string & name);
+
+std::string FileNameFromFullPath(std::string path);
+
+/// Get file name from full path without extension.
+std::string GetNameFromFullPathWithoutExt(std::string path);
+
+/// Returns all but last components of the path. After dropping the last
+/// component, all trailing slashes are removed, unless the result is a
+/// root directory. If the argument is a single component, returns ".".
+std::string GetDirectory(std::string const & path);
+
+/// Get native folder separator for the platform.
+std::string::value_type GetNativeSeparator();
+
+/// Add the terminating slash to the folder path std::string if it's not already there.
+std::string AddSlashIfNeeded(std::string const & path);
+
+namespace impl
+{
+inline std::string JoinPath(std::string const & file) { return file; }
+
+template <typename... Args>
+std::string JoinPath(std::string const & folder, Args &&... args)
+{
+  if (folder.empty())
+    return {};
+
+  return AddSlashIfNeeded(folder) + impl::JoinPath(std::forward<Args>(args)...);
+}
+}  // namespace impl
+
+/// Create full path from some folder using native folders separator.
+template <typename... Args>
+std::string JoinPath(std::string const & dir, std::string const & fileOrDir, Args &&... args)
+{
+  ASSERT(!dir.empty(), ("JoinPath dir is empty"));
+  ASSERT(!fileOrDir.empty(), ("JoinPath fileOrDir is empty"));
+  return impl::JoinPath(dir, fileOrDir, std::forward<Args>(args)...);
+}
+}  // namespace base