settings: add support for preferred last.fm info language

doc/config

@@ -287,6 +287,16 @@
 #
 #follow_now_playing_lyrics = "no"
 #
+##
+## Note: If you set this variable, ncmpcpp will try to
+## get info from last.fm in language you set and if it
+## fails, it will fall back to english. Otherwise it will
+## use english the first time.
+##
+## Note: Language has to be expressed as an ISO 639 alpha-2 code.
+##
+#lastfm_preferred_language = ""
+#
 #ncmpc_like_songs_adding = "no" (enabled - add/remove, disabled - always add)
 #
 #show_hidden_files_in_local_browser = "no"

doc/ncmpcpp.1

@@ -219,6 +219,9 @@ If enabled, seek time will increment by one each second of seeking.
 .B follow_now_playing_lyrics = yes/no
 If enabled, lyrics will be switched at song's change to currently playing one's (Note: this works only if you are viewing lyrics of item from Playlist).
 .TP
+.B lastfm_preferred_language = ISO 639 alpha-2 language code
+If set, ncmpcpp will try to get info from last.fm in language you set and if it fails, it will fall back to english. Otherwise it will use english the first time.
+.TP
 .B ncmpc_like_songs_adding = yes/no
 If enabled, pressing space on item, which is already in playlist will remove it, otherwise add it again.
 .TP 

src/ncmpcpp.cpp

@@ -2068,7 +2068,7 @@ int main(int argc, char *argv[])
 			else if (myScreen == myLibrary && myLibrary->Main() == myLibrary->Artists)
 				artist = myLibrary->Artists->Current();
 			
-			if (!artist.empty() && myLastfm->SetArtistInfoArgs(artist))
+			if (!artist.empty() && myLastfm->SetArtistInfoArgs(artist, Config.lastfm_preferred_language))
 				myLastfm->SwitchTo();
 		}
 #		endif // HAVE_CURL_CURL_H

src/settings.cpp

@@ -763,6 +763,11 @@ void NcmpcppConfig::Read()
 					new_header_second_line += '}';
 				}
 			}
+			else if (cl.find("lastfm_preferred_language") != std::string::npos)
+			{
+				if (!v.empty() && v != "en")
+					lastfm_preferred_language = v;
+			}
 			else if (cl.find("browser_playlist_prefix") != std::string::npos)
 			{
 				if (!v.empty())

src/settings.h

@@ -166,6 +166,7 @@ struct NcmpcppConfig
 	std::string execute_on_song_change;
 	std::string new_header_first_line;
 	std::string new_header_second_line;
+	std::string lastfm_preferred_language;
 	std::basic_string<my_char_t> progressbar;
 	
 	std::string pattern;