PlaylistFile: use class SongLoader

NEWS

@@ -3,6 +3,7 @@ ver 0.19 (not yet released)
   - new commands "addtagid", "cleartagid"
   - "lsinfo" and "readcomments" allowed for remote files
   - "listneighbors" lists file servers on the local network
+  - "playlistadd" supports file:///
 * database
   - proxy: forward "idle" events
   - proxy: copy "Last-Modified" from remote directories

src/PlaylistFile.cxx

@@ -22,8 +22,8 @@
 #include "PlaylistSave.hxx"
 #include "db/PlaylistInfo.hxx"
 #include "db/PlaylistVector.hxx"
-#include "db/DatabaseSong.hxx"
 #include "DetachedSong.hxx"
+#include "SongLoader.hxx"
 #include "Mapper.hxx"
 #include "fs/TextFile.hxx"
 #include "config/ConfigGlobal.hxx"
@@ -402,24 +402,17 @@ spl_append_song(const char *utf8path, const DetachedSong &song, Error &error)
 }
 
 bool
-spl_append_uri(const char *utf8file, const char *url, Error &error)
+spl_append_uri(const char *utf8file,
+	       const SongLoader &loader, const char *url,
+	       Error &error)
 {
-	if (uri_has_scheme(url)) {
-		return spl_append_song(utf8file, DetachedSong(url),
-				       error);
-	} else {
-#ifdef ENABLE_DATABASE
-		DetachedSong *song = DatabaseDetachSong(url, error);
+	DetachedSong *song = loader.LoadSong(url, error);
 	if (song == nullptr)
 		return false;
 
 	bool success = spl_append_song(utf8file, *song, error);
 	delete song;
 	return success;
-#else
-		return false;
-#endif
-	}
 }
 
 static bool

src/PlaylistFile.hxx

@@ -24,6 +24,7 @@
 #include <string>
 
 class DetachedSong;
+class SongLoader;
 class PlaylistVector;
 class Error;
 
@@ -71,7 +72,9 @@ bool
 spl_append_song(const char *utf8path, const DetachedSong &song, Error &error);
 
 bool
-spl_append_uri(const char *path_utf8, const char *uri_utf8, Error &error);
+spl_append_uri(const char *path_utf8,
+	       const SongLoader &loader, const char *uri_utf8,
+	       Error &error);
 
 bool
 spl_rename(const char *utf8from, const char *utf8to, Error &error);

src/command/PlaylistCommands.cxx

@@ -188,13 +188,8 @@ handle_playlistadd(Client &client, gcc_unused int argc, char *argv[])
 	bool success;
 	Error error;
 	if (uri_has_scheme(uri)) {
-		if (!uri_supported_scheme(uri)) {
-			command_error(client, ACK_ERROR_NO_EXIST,
-				      "unsupported URI scheme");
-			return CommandResult::ERROR;
-		}
-
-		success = spl_append_uri(playlist, uri, error);
+		const SongLoader loader(client);
+		success = spl_append_uri(playlist, loader, uri, error);
 	} else {
 #ifdef ENABLE_DATABASE
 		success = search_add_to_playlist(uri, playlist, nullptr,