feat(ssh-add): (non-)complete -H, -h, and -S arguments

Author: scop

completions/ssh-add

@@ -10,14 +10,27 @@ _comp_cmd_ssh_add()
             _comp_compgen -- -W 'md5 sha256'
             return
             ;;
+        -*H)
+            _comp_compgen_filedir
+            return
+            ;;
+        -*h)
+            # TODO should we try supporting more types of constraints?
+            if [[ $cur == *@* ]]; then
+                _comp_complete_user_at_host "$@"
+            else
+                _comp_compgen_known_hosts -- "$cur"
+            fi
+            return
+            ;;
         -*t)
             return
             ;;
         -*T)
             _comp_compgen_filedir
             return
             ;;
-        -*[se])
+        -*S | -*[se])
             _comp_compgen_filedir so
             return
             ;;