player: use XDG_STATE_HOME for watch_later

A pain point for some users is the fact that watch_later is stored in
the ~/.config directory when it's really not configuration data. Roughly
2 years ago, XDG_STATE_DIR was added to the XDG Base Directory
Specification[0] and its description, user-specific state data, actually
perfectly matches what watch_later data is for. Let's go ahead and use
this directory as the default for watch_later. This change only affects
non-darwin unix-like systems (i.e. Linux, BSDs, etc.). The directory
doesn't move for anyone else.

Internally, quite a few things change with regards to the path
selection. If the platform in question does not have a statedir concept,
then the path selection will simply return "home" instead (old
behavior). Fixes #9147.

[0]: https://gitlab.freedesktop.org/xdg/xdg-specs/-/commit/4f2884e16db35f2962d9b64312917c81be5cb54b

1 files changed, 6 insertions, 0 deletions

diff --git a/osdep/path.h b/osdep/path.h
index 43b9d63bbe..d678b12072 100644
--- a/osdep/path.h
+++ b/osdep/path.h
@@ -11,6 +11,12 @@
 //  "global"        the least priority, global config file location
 //  "desktop"       path to desktop contents
 //
+//  These additional types are also defined. However, they are not necessarily
+//  implemented on every platform. Unlike some other type values that are
+//  platform specific (like "osxbundle"), the value of "home" is returned
+//  instead if these types are not explicitly defined.
+//  "state"         the native mpv-specific user state dir
+//
 // It is allowed to return a static string, so the caller must set talloc_ctx
 // to something other than NULL to avoid memory leaks.
 typedef const char *(*mp_get_platform_path_cb)(void *talloc_ctx, const char *type);