detect file encoding when loading it

src/core/TextLoader.h

@@ -6,6 +6,7 @@
 #include <memory>
 #include "Span.h"
 #include "LineEndings.h"
+#include "Encoding.h"
 
 class TextLoader
 {
@@ -24,12 +25,14 @@ public:
         }
     }
     LineEndings::Type get_line_endings() { return m_line_endings; }
+    Encoding::Type get_encoding() { return m_encoding; }
     auto begin() { return m_lines->begin(); }
     auto end() { return m_lines->end(); }
     bool get_eol_at_eof() { return m_eol_at_eof; }
 
 protected:
     LineEndings::Type m_line_endings;
+    Encoding::Type m_encoding;
     bool m_eol_at_eof;
     std::shared_ptr<std::list<Span>> m_lines;
 };