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