Introduce xbps_{pkgdb,rpool}_get_pkg_fulldeptree().

These routines return a xbps_array_t with a full sorted dependency graph
for the target pkg, by querying pkgdb or rpool.

Update xbps-query(8) to use the new libxbps API.

include/xbps.h.in

@@ -48,7 +48,7 @@
  *
  * This header documents the full API for the XBPS Library.
  */
-#define XBPS_API_VERSION	"20141117-1"
+#define XBPS_API_VERSION	"20141120"
 
 #ifndef XBPS_VERSION
  #define XBPS_VERSION		"UNSET"
@@ -815,11 +815,25 @@ xbps_dictionary_t xbps_pkgdb_get_pkg_files(struct xbps_handle *xhp,
  * @param[in] xhp The pointer to the xbps_handle struct.
  * @param[in] pkg Package expression to match.
  *
- * @return A proplib array of strings with reverse dependencies for \a pkg.
+ * @return A proplib array of strings with reverse dependencies for \a pkg,
+ * NULL otherwise.
  */
 xbps_array_t xbps_pkgdb_get_pkg_revdeps(struct xbps_handle *xhp,
 					const char *pkg);
 
+/**
+ * Returns a proplib array of strings with a proper sorted list
+ * of packages of a full dependency graph for \a pkg.
+ *
+ * @param[in] xhp The pointer to the xbps_handle struct.
+ * @param[in] pkg Package expression to match.
+ *
+ * @return A proplib array of strings with the full dependency graph for \a pkg,
+ * NULL otherwise.
+ */
+xbps_array_t xbps_pkgdb_get_pkg_fulldeptree(struct xbps_handle *xhp,
+					const char *pkg);
+
 /**
  * Updates the package database (pkgdb) with new contents from the
  * cached memory copy to disk.
@@ -1310,6 +1324,18 @@ xbps_dictionary_t xbps_rpool_get_virtualpkg(struct xbps_handle *xhp,
  */
 xbps_array_t xbps_rpool_get_pkg_revdeps(struct xbps_handle *xhp, const char *pkg);
 
+/**
+ * Returns a proplib array of strings with a proper sorted list
+ * of packages of a full dependency graph for \a pkg.
+ *
+ * @param[in] xhp The pointer to the xbps_handle struct.
+ * @param[in] pkg Package expression to match.
+ *
+ * @return A proplib array of strings with the full dependency graph for \a pkg,
+ * NULL otherwise.
+ */
+xbps_array_t xbps_rpool_get_pkg_fulldeptree(struct xbps_handle *xhp, const char *pkg);
+
 /**
  * Iterate over the the repository pool and search for a metadata plist
  * file in a binary package matching `pattern'. If a package is matched

include/xbps_api_impl.h

@@ -149,5 +149,7 @@ char HIDDEN *xbps_archive_get_file(struct archive *, struct archive_entry *);
 xbps_dictionary_t HIDDEN xbps_archive_get_dictionary(struct archive *,
 		struct archive_entry *);
 const char HIDDEN *vpkg_user_conf(struct xbps_handle *, const char *, bool);
+xbps_array_t HIDDEN xbps_get_pkg_fulldeptree(struct xbps_handle *,
+		const char *, bool);
 
 #endif /* !_XBPS_API_IMPL_H_ */