lyrics: converted in-process plugins to external programs

In-process plugins are very problematic.  It is much easier and
flexible to move the lyrics plugins to external programs, with a
trivial protocol.  This is work in progress, among the things missing:

 - protocol specification, including exit codes
 - plugin installation
 - plugin search directory
 - run-time configuration (currently hard coded)
 - automatic polling (using glib's main loop?)
 - better and more robust error handling

1 files changed, 48 insertions, 0 deletions

diff --git a/src/lyrics.h b/src/lyrics.h
new file mode 100644
index 000000000..34380c344
--- /dev/null
+++ b/src/lyrics.h
@@ -0,0 +1,48 @@
+/* ncmpc
+ * Copyright (C) 2008 Max Kellermann <max@duempel.org>
+ * This project's homepage is: http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef LYRICS_H
+#define LYRICS_H
+
+#include <glib.h>
+
+enum lyrics_loader_result {
+	LYRICS_SUCCESS,
+	LYRICS_BUSY,
+	LYRICS_FAILED
+};
+
+struct lyrics_loader;
+
+void lyrics_init(void);
+
+void lyrics_deinit(void);
+
+struct lyrics_loader *
+lyrics_load(const char *artist, const char *title);
+
+void
+lyrics_free(struct lyrics_loader *loader);
+
+enum lyrics_loader_result
+lyrics_result(struct lyrics_loader *loader);
+
+const GString *
+lyrics_get(struct lyrics_loader *loader);
+
+#endif