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-module(rebar_prv_packages).
-behaviour(provider).
-export([init/1,
do/1,
format_error/2]).
-include("rebar.hrl").
-define(PROVIDER, pkgs).
-define(DEPS, []).
-spec init(rebar_state:t()) -> {ok, rebar_state:t()}.
init(State) ->
State1 = rebar_state:add_provider(State, providers:create([{name, ?PROVIDER},
{module, ?MODULE},
{bare, false},
{deps, ?DEPS},
{example, "rebar pkgs"},
{short_desc, "List available packages."},
{desc, info("List available packages")},
{opts, []}])),
{ok, State1}.
-spec do(rebar_state:t()) -> {ok, rebar_state:t()} | {error, string()}.
do(State) ->
{Packages, _Graph} = rebar_packages:get_packages(State),
print_packages(Packages),
{ok, State}.
-spec format_error(any(), rebar_state:t()) -> {iolist(), rebar_state:t()}.
format_error(Reason, State) ->
{io_lib:format("~p", [Reason]), State}.
print_packages(Packages) ->
Keys = lists:keysort(1, dict:fetch_keys(Packages)),
Pkgs = merge(Keys),
lists:foreach(fun({Name, Vsns}) ->
VsnStr = join(Vsns, <<", ">>),
io:format("~s:~n Versions: ~s~n~n", [Name, VsnStr])
end, Pkgs).
-spec merge([{binary(), binary()}]) -> [{binary(), [binary()]}].
merge(List) ->
merge([], List).
merge(List, []) ->
List;
merge([{Key, Values} | T], [{Key, Value} | Rest]) ->
merge([{Key, [Value | Values]} | T], Rest);
merge(List, [{Key, Value} | Rest]) ->
merge([{Key, [Value]} | List], Rest).
-spec join([binary()], binary()) -> binary().
join([Bin], _Sep) ->
<<Bin/binary>>;
join([Bin | T], Sep) ->
<<Bin/binary, Sep/binary, (join(T, Sep))/binary>>.
info(Description) ->
io_lib:format("~s.~n", [Description]).
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