wide string: a few adjustments

src/lyrics.cpp

@@ -129,7 +129,7 @@ std::wstring Lyrics::title()
 	std::wstring result = L"Lyrics: ";
 	
 	result += Scroller(
-		Format::stringify<wchar_t>(Format::wparse(L"{%a - %t}"), &itsSong),
+		Format::stringify<wchar_t>(Format::wparse(L"%a - %t"), &itsSong),
 		itsScrollBegin,
 		COLS-result.length()-(Config.design == Design::Alternative ? 2 : Global::VolumeState.length())
 	);

src/utility/wide_string.cpp

@@ -22,14 +22,14 @@
 #include <cassert>
 #include "utility/wide_string.h"
 
-std::string ToString(std::wstring ws)
+std::string ToString(const std::wstring &ws)
 {
-	return boost::locale::conv::utf_to_utf<char>(std::move(ws));
+	return boost::locale::conv::utf_to_utf<char>(ws);
 }
 
-std::wstring ToWString(std::string s)
+std::wstring ToWString(const std::string &s)
 {
-	return boost::locale::conv::utf_to_utf<wchar_t>(std::move(s));
+	return boost::locale::conv::utf_to_utf<wchar_t>(s);
 }
 
 size_t wideLength(const std::wstring &ws)
@@ -52,7 +52,7 @@ void wideCut(std::wstring &ws, size_t max_length)
 	int remained_len = max_length;
 	for (; i < ws.length(); ++i)
 	{
-		remained_len -= wcwidth(ws[i]);
+		remained_len -= std::max(wcwidth(ws[i]), 1);
 		if (remained_len < 0)
 		{
 			ws.resize(i);

src/utility/wide_string.h

@@ -23,14 +23,13 @@
 
 #include <string>
 
-std::string ToString(std::wstring ws);
-std::wstring ToWString(std::string s);
+std::string ToString(const std::wstring &ws);
+std::wstring ToWString(const std::string &s);
 
 size_t wideLength(const std::wstring &ws);
-
 void wideCut(std::wstring &ws, size_t max_length);
-std::wstring wideShorten(const std::wstring &ws, size_t max_length);
 
+std::wstring wideShorten(const std::wstring &ws, size_t max_length);
 inline std::string wideShorten(const std::string &s, size_t max_length)
 {
 	return ToString(wideShorten(ToWString(s), max_length));