browser: if current dir doesn't exists, go down one level automatically

src/helpers.cpp

@@ -372,6 +372,12 @@ std::string ExtractTopName(const std::string &s)
 	return slash != std::string::npos ? s.substr(++slash) : s;
 }
 
+std::string PathGoDownOneLevel(const std::string &path)
+{
+	size_t i = path.rfind('/');
+	return i == std::string::npos ? "/" : path.substr(0, i);
+}
+
 std::basic_string<my_char_t> Scroller(const std::basic_string<my_char_t> &str, size_t &pos, size_t width)
 {
 	std::basic_string<my_char_t> s(str);

src/helpers.h

@@ -213,6 +213,7 @@ std::string FindSharedDir(const MPD::SongList &);
 #endif // HAVE_TAGLIB_H
 std::string FindSharedDir(const std::string &, const std::string &);
 std::string ExtractTopName(const std::string &);
+std::string PathGoDownOneLevel(const std::string &path);
 
 std::string GetLineValue(std::string &, char = '"', char = '"', bool = 0);
 

src/mpdpp.cpp

@@ -191,7 +191,13 @@ void MPD::Connection::UpdateStatus()
 		}
 	}
 	
+	// if CheckForErrors() invokes callback, it can do some communication with mpd.
+	// the problem is, we *have* to be out from idle mode here and issuing commands
+	// will enter it again, which certainly is not desired, so let's block it for
+	// a while.
+	BlockIdle(true);
 	CheckForErrors();
+	BlockIdle(false);
 	
 	if (!itsConnection)
 		return;

src/status.cpp

@@ -205,6 +205,11 @@ void NcmpcppErrorCallback(MPD::Connection *, int errorid, const char *msg, void
 			ShowMessage("Password accepted!");
 		wFooter->SetGetStringHelper(StatusbarGetStringHelper);
 	}
+	else if ((errorid >> 8) == MPD_SERVER_ERROR_NO_EXIST && myScreen == myBrowser)
+	{
+		myBrowser->GetDirectory(PathGoDownOneLevel(myBrowser->CurrentDir()));
+		myBrowser->Refresh();
+	}
 	else
 		ShowMessage("%s", msg);
 }