%% -------------------------------------------------------------------
%%
%% rebar: Erlang Build Tools
%%
%% Copyright (c) 2009 Dave Smith (dizzyd@dizzyd.com)
%%
%% Permission is hereby granted, free of charge, to any person obtaining a copy
%% of this software and associated documentation files (the "Software"), to deal
%% in the Software without restriction, including without limitation the rights
%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
%% copies of the Software, and to permit persons to whom the Software is
%% furnished to do so, subject to the following conditions:
%%
%% The above copyright notice and this permission notice shall be included in
%% all copies or substantial portions of the Software.
%%
%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
%% THE SOFTWARE.
%% -------------------------------------------------------------------
-module(rebar_deps).

-include("rebar.hrl").

-export([preprocess/2]).

%% ===================================================================
%% Public API
%% ===================================================================

preprocess(Config, _) ->
    %% Get the directory where we will place downloaded deps
    DepsDir = rebar_config:get(Config, deps_dir, "deps"),

    %% Process the list of deps from the configuration
    Dirs = process_deps(rebar_config:get(Config, deps, []), [], DepsDir),
    {ok, Config, Dirs}.


%% ===================================================================
%% Internal functions
%% ===================================================================

process_deps([], Acc, _Dir) ->
    Acc;
process_deps([App | Rest], Acc, Dir) when is_atom(App) ->
    case code:lib_dir(App) of
        {error, bad_name} ->
            %% The requested app is not available on the code path
            ?ABORT("~s: Dependency ~s not available.\n",
                   [rebar_utils:get_cwd(), App]);
        Path ->
            ?INFO("Dependency ~s -> ~s\n", [App, Path])
    end,
    process_deps(Rest, Acc, Dir).