allow loading playlists specified as absolute filesystem paths

implement for the "load" command the same logic used for the "add"
command: local clients can load playlist specified as absolute paths.

For relative paths the old logic is preserved: first look for a stored
playlist, then look in the music directory.

src/playlist/PlaylistAny.cxx

@@ -17,6 +17,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#include "LocateUri.hxx"
 #include "PlaylistAny.hxx"
 #include "PlaylistStream.hxx"
 #include "PlaylistMapper.hxx"
@@ -25,17 +26,26 @@
 #include "config.h"
 
 std::unique_ptr<SongEnumerator>
-playlist_open_any(const char *uri,
+playlist_open_any(const LocatedUri &located_uri,
 #ifdef ENABLE_DATABASE
 		  const Storage *storage,
 #endif
 		  Mutex &mutex)
 {
-	return uri_has_scheme(uri)
-		? playlist_open_remote(uri, mutex)
-		: playlist_mapper_open(uri,
+	switch (located_uri.type) {
+	case LocatedUri::Type::ABSOLUTE:
+		return playlist_open_remote(located_uri.canonical_uri, mutex);
+
+	case LocatedUri::Type::PATH:
+		return playlist_open_path(located_uri.path, mutex);
+
+	case LocatedUri::Type::RELATIVE:
+		return playlist_mapper_open(located_uri.canonical_uri,
 #ifdef ENABLE_DATABASE
 				       storage,
 #endif
 				       mutex);
+	}
+
+	gcc_unreachable();
 }

src/playlist/PlaylistAny.hxx

@@ -34,7 +34,7 @@ class Storage;
  * music or playlist directory.
  */
 std::unique_ptr<SongEnumerator>
-playlist_open_any(const char *uri,
+playlist_open_any(const LocatedUri &located_uri,
 #ifdef ENABLE_DATABASE
 		  const Storage *storage,
 #endif

src/playlist/PlaylistQueue.cxx

@@ -18,6 +18,7 @@
  */
 
 #include "config.h"
+#include "LocateUri.hxx"
 #include "PlaylistQueue.hxx"
 #include "PlaylistAny.hxx"
 #include "PlaylistSong.hxx"
@@ -63,7 +64,7 @@ playlist_load_into_queue(const char *uri, SongEnumerator &e,
 }
 
 void
-playlist_open_into_queue(const char *uri,
+playlist_open_into_queue(const LocatedUri &uri,
 			 unsigned start_index, unsigned end_index,
 			 playlist &dest, PlayerControl &pc,
 			 const SongLoader &loader)
@@ -78,7 +79,7 @@ playlist_open_into_queue(const char *uri,
 	if (playlist == nullptr)
 		throw PlaylistError::NoSuchList();
 
-	playlist_load_into_queue(uri, *playlist,
+	playlist_load_into_queue(uri.canonical_uri, *playlist,
 				 start_index, end_index,
 				 dest, pc, loader);
 }

src/playlist/PlaylistQueue.hxx

@@ -49,7 +49,7 @@ playlist_load_into_queue(const char *uri, SongEnumerator &e,
  * play queue.
  */
 void
-playlist_open_into_queue(const char *uri,
+playlist_open_into_queue(const LocatedUri &uri,
 			 unsigned start_index, unsigned end_index,
 			 playlist &dest, PlayerControl &pc,
 			 const SongLoader &loader);

src/playlist/Print.cxx

@@ -18,6 +18,7 @@
  */
 
 #include "config.h"
+#include "LocateUri.hxx"
 #include "Print.hxx"
 #include "PlaylistAny.hxx"
 #include "PlaylistSong.hxx"
@@ -55,7 +56,7 @@ playlist_provider_print(Response &r,
 bool
 playlist_file_print(Response &r, Partition &partition,
 		    const SongLoader &loader,
-		    const char *uri, bool detail)
+		    const LocatedUri &uri, bool detail)
 {
 	Mutex mutex;
 
@@ -71,6 +72,6 @@ playlist_file_print(Response &r, Partition &partition,
 	if (playlist == nullptr)
 		return false;
 
-	playlist_provider_print(r, loader, uri, *playlist, detail);
+	playlist_provider_print(r, loader, uri.canonical_uri, *playlist, detail);
 	return true;
 }

src/playlist/Print.hxx

@@ -34,6 +34,6 @@ struct Partition;
 bool
 playlist_file_print(Response &r, Partition &partition,
 		    const SongLoader &loader,
-		    const char *uri, bool detail);
+		    const LocatedUri &uri, bool detail);
 
 #endif