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%%% @doc Meta-provider that dynamically compiles providers
%%% to run aliased commands.
%%%
%%% This is hackish and out-there, but this module has graduated
%%% from a plugin at https://github.com/tsloughter/rebar_alias after
%%% years of stability. Only some error checks were added
-module(rebar_prv_alias).
-export([init/1]).
-include("rebar.hrl").
%% ===================================================================
%% Public API
%% ===================================================================
-spec init(rebar_state:t()) -> {ok, rebar_state:t()}.
init(State) ->
Aliases = rebar_state:get(State, alias, []),
lists:foldl(fun({Alias, Cmds}, {ok, StateAcc}) ->
case validate_provider(Alias, Cmds, State) of
true -> init_alias(Alias, Cmds, StateAcc);
false -> {ok, State}
end
end, {ok, State}, Aliases).
init_alias(Alias, Cmds, State) ->
Module = list_to_atom("rebar_prv_alias_" ++ atom_to_list(Alias)),
MF = module(Module),
EF = exports(),
FF = do_func(Cmds),
{ok, _, Bin} = compile:forms([MF, EF, FF]),
code:load_binary(Module, "none", Bin),
Provider = providers:create([
{name, Alias},
{module, Module},
{bare, true},
{deps, []},
{example, example(Alias)},
{opts, []},
{short_desc, desc(Cmds)},
{desc, desc(Cmds)}
]),
{ok, rebar_state:add_provider(State, Provider)}.
validate_provider(Alias, Cmds, State) ->
%% This would be caught and prevented anyway, but the warning
%% is friendlier
case providers:get_provider(Alias, rebar_state:providers(State)) of
not_found ->
%% check for circular deps in the alias.
case not proplists:is_defined(Alias, Cmds) of
true -> true;
false ->
?WARN("Alias ~p contains itself and would never "
"terminate. It will be ignored.",
[Alias]),
false
end;
_ ->
?WARN("Alias ~p is already the name of a command in "
"the default namespace and will be ignored.",
[Alias]),
false
end.
example(Alias) ->
"rebar3 " ++ atom_to_list(Alias).
desc(Cmds) ->
"Equivalent to running: rebar3 do " ++
rebar_string:join(lists:map(fun({Cmd, Args}) ->
atom_to_list(Cmd) ++ " " ++ Args;
(Cmd) ->
atom_to_list(Cmd)
end, Cmds), ",").
module(Name) ->
{attribute,1,module,Name}.
exports() ->
{attribute,1,export,[{do,1}]}.
do_func(Cmds) ->
{function,1,do,1,
[{clause,1,
[{var,1,'State'}],
[],
[{call,1,
{remote,1,{atom,1,rebar_prv_do},{atom,1,do_tasks}},
[to_args(Cmds),{var,1,'State'}]}]}]}.
to_args([]) ->
{nil,1};
to_args([{Cmd, Args} | Rest]) ->
{cons,1,{tuple,1,[{string,1,atom_to_list(Cmd)},{string,1,Args}]}, to_args(Rest)};
to_args([Cmd | Rest]) ->
{cons,1,{tuple,1,[{string,1,atom_to_list(Cmd)},{nil,1}]}, to_args(Rest)}.
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