queue_save: save tags and range of non-database songs

Use the functions song_save() and song_load() to use the same format
as in the database file for those songs which need the tags.

src/playlist_state.c

@@ -108,7 +108,7 @@ playlist_state_load(FILE *fp, GString *buffer, struct playlist *playlist)
 	}
 
 	while (!g_str_has_prefix(line, PLAYLIST_STATE_FILE_PLAYLIST_END)) {
-		queue_load_song(&playlist->queue, line);
+		queue_load_song(fp, buffer, line, &playlist->queue);
 
 		line = read_text_line(fp, buffer);
 		if (line == NULL) {

src/queue_save.c

@@ -23,11 +23,12 @@
 #include "song.h"
 #include "uri.h"
 #include "database.h"
+#include "song_save.h"
 
 #include <stdlib.h>
 
 static void
-queue_save_song(FILE *fp, int idx, const struct song *song)
+queue_save_database_song(FILE *fp, int idx, const struct song *song)
 {
 	char *uri = song_get_uri(song);
 
@@ -35,6 +36,21 @@ queue_save_song(FILE *fp, int idx, const struct song *song)
 	g_free(uri);
 }
 
+static void
+queue_save_full_song(FILE *fp, const struct song *song)
+{
+	song_save(fp, song);
+}
+
+static void
+queue_save_song(FILE *fp, int idx, const struct song *song)
+{
+	if (song_in_database(song))
+		queue_save_database_song(fp, idx, song);
+	else
+		queue_save_full_song(fp, song);
+}
+
 void
 queue_save(FILE *fp, const struct queue *queue)
 {
@@ -51,26 +67,40 @@ get_song(const char *uri)
 }
 
 void
-queue_load_song(struct queue *queue, const char *line)
+queue_load_song(FILE *fp, GString *buffer, const char *line,
+		struct queue *queue)
 {
-	long ret;
-	char *endptr;
 	struct song *song;
 
 	if (queue_is_full(queue))
 		return;
 
-	ret = strtol(line, &endptr, 10);
-	if (ret < 0 || *endptr != ':' || endptr[1] == 0) {
-		g_warning("Malformed playlist line in state file");
-		return;
+	if (g_str_has_prefix(line, SONG_BEGIN)) {
+		const char *uri = line + sizeof(SONG_BEGIN) - 1;
+		if (!uri_has_scheme(uri) && !g_path_is_absolute(uri))
+			return;
+
+		GError *error = NULL;
+		song = song_load(fp, NULL, uri, buffer, &error);
+		if (song == NULL) {
+			g_warning("%s", error->message);
+			g_error_free(error);
+			return;
+		}
+	} else {
+		char *endptr;
+		long ret = strtol(line, &endptr, 10);
+		if (ret < 0 || *endptr != ':' || endptr[1] == 0) {
+			g_warning("Malformed playlist line in state file");
+			return;
+		}
+
+		line = endptr + 1;
+
+		song = get_song(line);
+		if (song == NULL)
+			return;
 	}
 
-	line = endptr + 1;
-
-	song = get_song(line);
-	if (song == NULL)
-		return;
-
 	queue_append(queue, song);
 }

src/queue_save.h

@@ -25,6 +25,7 @@
 #ifndef QUEUE_SAVE_H
 #define QUEUE_SAVE_H
 
+#include <glib.h>
 #include <stdio.h>
 
 struct queue;
@@ -36,6 +37,7 @@ queue_save(FILE *fp, const struct queue *queue);
  * Loads one song from the state file and appends it to the queue.
  */
 void
-queue_load_song(struct queue *queue, const char *line);
+queue_load_song(FILE *fp, GString *buffer, const char *line,
+		struct queue *queue);
 
 #endif

src/song_save.c

@@ -41,11 +41,9 @@ song_save_quark(void)
 	return g_quark_from_static_string("song_save");
 }
 
-static int
-song_save(struct song *song, void *data)
+void
+song_save(FILE *fp, const struct song *song)
 {
-	FILE *fp = data;
-
 	fprintf(fp, SONG_BEGIN "%s\n", song->uri);
 
 	if (song->end_ms > 0)
@@ -58,20 +56,28 @@ song_save(struct song *song, void *data)
 
 	fprintf(fp, SONG_MTIME ": %li\n", (long)song->mtime);
 	fprintf(fp, SONG_END "\n");
+}
 
+static int
+song_save_callback(struct song *song, void *data)
+{
+	FILE *fp = data;
+	song_save(fp, song);
 	return 0;
 }
 
 void songvec_save(FILE *fp, const struct songvec *sv)
 {
-	songvec_for_each(sv, song_save, fp);
+	songvec_for_each(sv, song_save_callback, fp);
 }
 
 struct song *
 song_load(FILE *fp, struct directory *parent, const char *uri,
 	  GString *buffer, GError **error_r)
 {
-	struct song *song = song_file_new(uri, parent);
+	struct song *song = parent != NULL
+		? song_file_new(uri, parent)
+		: song_remote_new(uri);
 	char *line, *colon;
 	enum tag_type type;
 	const char *value;

src/song_save.h

@@ -26,9 +26,13 @@
 
 #define SONG_BEGIN "song_begin: "
 
+struct song;
 struct songvec;
 struct directory;
 
+void
+song_save(FILE *fp, const struct song *song);
+
 void
 songvec_save(FILE *fp, const struct songvec *sv);