1 files changed, 69 insertions, 0 deletions
diff --git a/src/rebar_relx.erl b/src/rebar_relx.erl
new file mode 100644
index 0000000..a3adedd
--- /dev/null
+++ b/src/rebar_relx.erl
@@ -0,0 +1,69 @@
+%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
+%% ex: ts=4 sw=4 et
+
+-module(rebar_relx).
+
+-export([do/4,
+         format_error/1]).
+
+-include("rebar.hrl").
+
+%% ===================================================================
+%% Public API
+%% ===================================================================
+
+-spec do(atom(), string(), atom(), rebar_state:t()) -> {ok, rebar_state:t()} | {error, string()}.
+do(Module, Command, Provider, State) ->
+    Options = rebar_state:command_args(State),
+    DepsDir = rebar_dir:deps_dir(State),
+    ProjectAppDirs = lists:delete(".", ?DEFAULT_PROJECT_APP_DIRS),
+    LibDirs = rebar_utils:filtermap(fun ec_file:exists/1,
+                                   [?DEFAULT_CHECKOUTS_DIR, DepsDir | ProjectAppDirs]),
+    OutputDir = filename:join(rebar_dir:base_dir(State), ?DEFAULT_RELEASE_DIR),
+    AllOptions = string:join([Command | Options], " "),
+    Cwd = rebar_state:dir(State),
+    Providers = rebar_state:providers(State),
+    rebar_hooks:run_all_hooks(Cwd, pre, Provider, Providers, State),
+    try
+        case rebar_state:get(State, relx, []) of
+            [] ->
+                relx:main([{lib_dirs, LibDirs}
+                          ,{output_dir, OutputDir}
+                          ,{caller, api}], AllOptions);
+            Config ->
+                Config1 = update_config(Config),
+                relx:main([{lib_dirs, LibDirs}
+                          ,{config, Config1}
+                          ,{output_dir, OutputDir}
+                          ,{caller, api}], AllOptions)
+        end,
+        rebar_hooks:run_all_hooks(Cwd, post, Provider, Providers, State),
+        {ok, State}
+    catch
+        throw:T ->
+            {error, {Module, T}}
+    end.
+
+-spec format_error(any()) -> iolist().
+format_error(Reason) ->
+    io_lib:format("~p", [Reason]).
+
+%% To handle profiles rebar3 expects the provider to use the first entry
+%% in a configuration key-value list as the value of a key if dups exist.
+%% This does not work with relx. Some config options must not lose their
+%% order (release which has an extends option is one). So here we pull out
+%% options that are special so we can reverse the rest so what we expect
+%% from a rebar3 profile is what we get on the relx side.
+-define(SPECIAL_KEYS, [release, vm_args, sys_config, overlay_vars, lib_dirs]).
+
+update_config(Config) ->
+    {Special, Other} =
+        lists:foldl(fun(Tuple, {SpecialAcc, OtherAcc}) when is_tuple(Tuple) ->
+                            case lists:member(element(1, Tuple), ?SPECIAL_KEYS) of
+                                true ->
+                                    {[Tuple | SpecialAcc], OtherAcc};
+                                false ->
+                                    {SpecialAcc, [Tuple | OtherAcc]}
+                            end
+                    end, {[], []}, Config),
+    lists:reverse(Special) ++ Other.