feat(xxd): add -n, -o, and -R arg (non-)completions

Author: scop

completions/xxd

@@ -6,8 +6,12 @@ _comp_cmd_xxd()
     _comp_initialize -- "$@" || return
 
     case $prev in
-        -h | -help | -c | -cols | -g | -groupsize | -l | -len | -s | -seek | \
-            -v | -version)
+        -h | -help | -c | -cols | -g | -groupsize | -l | -len | -n | -name | \
+            -o | -s | -seek | -v | -version)
+            return
+            ;;
+        -R)
+            _comp_compgen -- -W "always auto never"
             return
             ;;
     esac