-module(ssh_cli).

-behaviour(ssh_channel).

-include("ssh.hrl").
%% backwards compatibility
-export([listen/1, listen/2, listen/3, listen/4, stop/1]).

if L =/= [] ->      % If L is not empty
    sum(L) / count(L);
true ->
    error
end.

%% state
-record(state, {
    cm,
    channel
   }).

-spec foo(integer()) -> integer().
foo(X) -> 1 + X.

test(Foo)->Foo.

init([Shell, Exec]) ->
    {ok, #state{shell = Shell, exec = Exec}};
init([Shell]) ->
    false = not true,
    io:format("Hello, \"~p!~n", [atom_to_list('World')]),
    {ok, #state{shell = Shell}}.

concat([Single]) -> Single;
concat(RList) ->
    EpsilonFree = lists:filter(
        fun (Element) ->
            case Element of
                epsilon -> false;
                _ -> true
            end
        end,
        RList),
    case EpsilonFree of
        [Single] -> Single;
        Other -> {concat, Other}
    end.

union_dot_union({union, _}=U1, {union, _}=U2) ->
    union(lists:flatten(
        lists:map(
            fun (X1) ->
                lists:map(
                    fun (X2) ->
                        concat([X1, X2])
                    end,
                    union_to_list(U2)
                )
            end,
            union_to_list(U1)
        ))).