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-module(rebar_packages).
-export([get_packages/1]).
-export_type([constraint/0]).
-include("rebar.hrl").
-type pkg_name() :: string() | binary() | atom().
-type vsn() :: 'NO_VSN'
| ec_semver:semver().
-type constraint_op() ::
'=' | gte | '>=' | lte | '<='
| gt | '>' | lt | '<' | pes | '~>' | between.
-type constraint() :: pkg_name()
| {pkg_name(), vsn()}
| {pkg_name(), vsn(), constraint_op()}
| {pkg_name(), vsn(), vsn(), between}.
-spec get_packages(rebar_state:t()) -> {rebar_dict(), rebar_digraph()}.
get_packages(State) ->
Home = rebar_utils:home_dir(),
RebarDir = rebar_state:get(State, global_rebar_dir, filename:join(Home, ?CONFIG_DIR)),
PackagesFile = filename:join(RebarDir, "packages"),
case ec_file:exists(PackagesFile) of
true ->
try
{ok, Binary} = file:read_file(PackagesFile),
{Dict, Graph} = binary_to_term(Binary),
{Dict, rebar_digraph:restore_graph(Graph)}
catch
_:_ ->
?ERROR("Bad packages index, try to fix with `rebar update`", []),
{dict:new(), digraph:new()}
end;
false ->
{dict:new(), digraph:new()}
end.
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