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%% @author author <author@example.com>
%% @copyright YYYY author.
%% @doc Ensure that the relatively-installed dependencies are on the code
%% loading path, and locate resources relative
%% to this application's path.
-module(skel_deps).
-author('author <author@example.com>').
-export([ensure/0, ensure/1]).
-export([get_base_dir/0, get_base_dir/1]).
-export([local_path/1, local_path/2]).
-export([deps_on_path/0, new_siblings/1]).
%% @spec deps_on_path() -> [ProjNameAndVers]
%% @doc List of project dependencies on the path.
deps_on_path() ->
F = fun (X, Acc) ->
ProjDir = filename:dirname(X),
case {filename:basename(X),
filename:basename(filename:dirname(ProjDir))} of
{"ebin", "deps"} ->
[filename:basename(ProjDir) | Acc];
_ ->
Acc
end
end,
ordsets:from_list(lists:foldl(F, [], code:get_path())).
%% @spec new_siblings(Module) -> [Dir]
%% @doc Find new siblings paths relative to Module that aren't already on the
%% code path.
new_siblings(Module) ->
Existing = deps_on_path(),
SiblingEbin = filelib:wildcard(local_path(["deps", "*", "ebin"], Module)),
Siblings = [filename:dirname(X) || X <- SiblingEbin,
ordsets:is_element(
filename:basename(filename:dirname(X)),
Existing) =:= false],
lists:filter(fun filelib:is_dir/1,
lists:append([[filename:join([X, "ebin"]),
filename:join([X, "include"])] ||
X <- Siblings])).
%% @spec ensure(Module) -> ok
%% @doc Ensure that all ebin and include paths for dependencies
%% of the application for Module are on the code path.
ensure(Module) ->
code:add_paths(new_siblings(Module)),
code:clash(),
ok.
%% @spec ensure() -> ok
%% @doc Ensure that the ebin and include paths for dependencies of
%% this application are on the code path. Equivalent to
%% ensure(?Module).
ensure() ->
ensure(?MODULE).
%% @spec get_base_dir(Module) -> string()
%% @doc Return the application directory for Module. It assumes Module is in
%% a standard OTP layout application in the ebin or src directory.
get_base_dir(Module) ->
{file, Here} = code:is_loaded(Module),
filename:dirname(filename:dirname(Here)).
%% @spec get_base_dir() -> string()
%% @doc Return the application directory for this application. Equivalent to
%% get_base_dir(?MODULE).
get_base_dir() ->
get_base_dir(?MODULE).
%% @spec local_path([string()], Module) -> string()
%% @doc Return an application-relative directory from Module's application.
local_path(Components, Module) ->
filename:join([get_base_dir(Module) | Components]).
%% @spec local_path(Components) -> string()
%% @doc Return an application-relative directory for this application.
%% Equivalent to local_path(Components, ?MODULE).
local_path(Components) ->
local_path(Components, ?MODULE).
%%
%% Tests
%%
-include_lib("eunit/include/eunit.hrl").
-ifdef(TEST).
-endif.
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