feat(tar): associate with *.xbps (Void Linux package)

Closes scop#685

Co-authored-by: Ville Skyttä <[email protected]>

Author: tornaria

completions/tar

@@ -441,7 +441,7 @@ __tar_cleanup_prev()
 
 __tar_detect_ext()
 {
-    local tars='@(@(tar|gem|spkg)?(.@(Z|[bgx]z|bz2|lz?(ma|o)|zst))|t@([abglx]z|b?(z)2|zst)|cbt)'
+    local tars='@(@(tar|gem|spkg)?(.@(Z|[bgx]z|bz2|lz?(ma|o)|zst))|t@([abglx]z|b?(z)2|zst)|cbt|xbps)'
     if [[ ${COMP_WORDS[0]} == ?(*/)bsdtar ]]; then
         # https://github.com/libarchive/libarchive/wiki/LibarchiveFormats
         tars=${tars/%\)/|pax|cpio|iso|zip|@(j|x)ar|mtree|a|7z|warc}
@@ -460,7 +460,7 @@ __tar_detect_ext()
             # Should never happen?
             ;;
         ?(-)*[cr]*f)
-            ext='@(tar|gem|spkg|cbt)'
+            ext='@(tar|gem|spkg|cbt|xpbs)'
             case ${words[1]} in
                 *a*) ext="$tars" ;;
                 *z*) ext='t?(ar.)gz' ;;