lastfm: fix fetching artist info in language other than English

NEWS

@@ -19,7 +19,8 @@ ncmpcpp-0.8 (????-??-??)
 * Lyrics and last_fm can now be startup screens and are lockable.
 * Action 'update_environment' now also synchronizes status with MPD.
 * Fixed an issue that could cause some MPD events to be missed.
-* ACtion 'jump_to_playing_song' is not runnable now if there is no playing song.
+* Action 'jump_to_playing_song' is not runnable now if there is no playing song.
+* Fixed fetching artist info in language other than English.
 
 ncmpcpp-0.7.7 (2016-10-31)
 * Fixed compilation on 32bit platforms.

src/lastfm_service.cpp

@@ -20,6 +20,7 @@
 
 #include "lastfm_service.h"
 
+#include <boost/algorithm/string/replace.hpp>
 #include <boost/algorithm/string/trim.hpp>
 #include <boost/locale/conversion.hpp>
 #include <fstream>
@@ -52,7 +53,7 @@ Service::Result Service::fetch()
 		url += "=";
 		url += Curl::escape(arg.second);
 	}
-	
+
 	std::string data;
 	CURLcode code = Curl::perform(data, url);
 	
@@ -63,7 +64,7 @@ Service::Result Service::fetch()
 	else
 	{
 		result = processData(data);
-		
+
 		// if relevant part of data was not found and one of arguments
 		// was language, try to fetch it again without that parameter.
 		// otherwise just report failure.
@@ -118,6 +119,10 @@ Service::Result ArtistInfo::processData(const std::string &data)
 				std::string url = what[1], wiki;
 				// unescape &amp;s
 				unescapeHtmlEntities(url);
+				// fill in language info since url points to english version.
+				const auto &lang = m_arguments["lang"];
+				if (!lang.empty())
+					boost::replace_first(url, "last.fm/music/", "last.fm/" + lang + "/music/");
 				// ...try to get the content of it...
 				CURLcode code = Curl::perform(wiki, url, "", true);
 				
@@ -145,7 +150,10 @@ Service::Result ArtistInfo::processData(const std::string &data)
 			result.second += desc;
 		}
 		else
+		{
 			result.second += "No description available for this artist.";
+			return result;
+		}
 	}
 	else
 	{