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%% -*- erlang-indent-level: 4; indent-tabs-mode: nil; fill-column: 80 -*-
%%% Copyright 2012 Erlware, LLC. All Rights Reserved.
%%%
%%% This file is provided to you under the Apache License,
%%% Version 2.0 (the "License"); you may not use this file
%%% except in compliance with the License. You may obtain
%%% a copy of the License at
%%%
%%% http://www.apache.org/licenses/LICENSE-2.0
%%%
%%% Unless required by applicable law or agreed to in writing,
%%% software distributed under the License is distributed on an
%%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
%%% KIND, either express or implied. See the License for the
%%% specific language governing permissions and limitations
%%% under the License.
%%%---------------------------------------------------------------------------
%%% @author Eric Merritt <[email protected]>
%%% @copyright (C) 2012 Erlware, LLC.
%%%
%%% @doc Trivial utility file to help handle common tasks
-module(rlx_util).
-export([mkdir_p/1,
to_binary/1,
to_string/1,
to_atom/1,
is_error/1,
error_reason/1,
indent/1,
optional_to_string/1]).
-define(ONE_LEVEL_INDENT, " ").
%%============================================================================
%% types
%%============================================================================
%%============================================================================
%% API
%%============================================================================
%% @doc Makes a directory including parent dirs if they are missing.
-spec mkdir_p(string()) -> ok | {error, Reason::file:posix()}.
mkdir_p(Path) ->
%% We are exploiting a feature of ensuredir that that creates all
%% directories up to the last element in the filename, then ignores
%% that last element. This way we ensure that the dir is created
%% and not have any worries about path names
DirName = filename:join([filename:absname(Path), "tmp"]),
filelib:ensure_dir(DirName).
%% @doc ident to the level specified
-spec indent(non_neg_integer()) -> iolist().
indent(Amount) when erlang:is_integer(Amount) ->
[?ONE_LEVEL_INDENT || _ <- lists:seq(1, Amount)].
-spec to_binary(iolist() | binary()) -> binary().
to_binary(String) when erlang:is_list(String) ->
erlang:iolist_to_binary(String);
to_binary(Bin) when erlang:is_binary(Bin) ->
Bin.
-spec to_string(binary() | string() | atom()) -> string().
to_string(Binary) when erlang:is_binary(Binary) ->
erlang:binary_to_list(Binary);
to_string(Atom) when erlang:is_atom(Atom) ->
erlang:atom_to_list(Atom);
to_string(Else) when erlang:is_list(Else) ->
Else.
-spec to_atom(atom() | string() | binary()) -> atom().
to_atom(Binary)
when erlang:is_binary(Binary) ->
erlang:list_to_atom(to_string(Binary));
to_atom(String)
when erlang:is_list(String) ->
erlang:list_to_atom(String);
to_atom(Atom)
when erlang:is_atom(Atom) ->
Atom.
%% @doc get the reason for a particular relx error
-spec error_reason(relx:error()) -> any().
error_reason({error, {_, Reason}}) ->
Reason.
%% @doc check to see if the value is a relx error
-spec is_error(relx:error() | any()) -> boolean().
is_error({error, _}) ->
true;
is_error(_) ->
false.
%% @doc convert optional argument to empty string if undefined
optional_to_string(undefined) ->
"";
optional_to_string(Value) when is_list(Value) ->
Value.
%%%===================================================================
%%% Test Functions
%%%===================================================================
-ifndef(NOTEST).
-include_lib("eunit/include/eunit.hrl").
-endif.
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