%% -------------------------------------------------------------------
%%
%% 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_utils).

-export([get_cwd/0,
         get_os/0]).


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

get_cwd() ->
    {ok, Dir} = file:get_cwd(),
    Dir.


get_os() ->
    Arch = erlang:system_info(system_architecture),
    case match_first([{"linux", linux}, {"darwin", darwin}], Arch) of
        nomatch ->
            {unknown, Arch};
        ArchAtom ->
            ArchAtom
    end.


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

match_first([], Val) ->
    nomatch;
match_first([{Regex, MatchValue} | Rest], Val) ->
    case re:run(Val, Regex, [{capture, none}]) of
        match ->
            MatchValue;
        nomatch ->
           match_first(Rest, Val)
    end.