Add proto compiler gpb inttest

exercises rebar/gpb integration

The bulk of these tests are written by Luis Rascão, hence he is the
author of this commit. As the committer, I have cherry-picked his two
commits 4c87bcd and ebb8182, from the feature/support_gpb_protobuf
branch in the git://github.com/lrascao/rebar repo, and have slightly
adapted it to fit this pluggable-proto-compilers-gpb branch.

Update the THANKS file

THANKS

@@ -127,4 +127,5 @@ alisdair sullivan
 Alexander Verbitsky
 Andras Horvath
 Drew Varner
-Roberto Aloi
+Roberto Aloi
+Luis Rascao

inttest/proto_gpb/include/.gitignore

@@ -0,0 +1,4 @@
+# Ignore everything in this directory
+*
+# Except this file
+!.gitignore

inttest/proto_gpb/proto_gpb_rt.erl

@@ -0,0 +1,110 @@
+%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
+%% ex: ts=4 sw=4 et
+%% -------------------------------------------------------------------
+%%
+%% rebar: Erlang Build Tools
+%%
+%% Copyright (c) 2014 Luis Rascão (luis.rascao@gmail.com)
+%%
+%% Permission is hereby granted, free of charge, to any person obtaining a copy
+%% of this software and associated documentation files (the "Software"), to deal
+%% in the Software without restriction, including without limitation the rights
+%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+%% copies of the Software, and to permit persons to whom the Software is
+%% furnished to do so, subject to the following conditions:
+%%
+%% The above copyright notice and this permission notice shall be included in
+%% all copies or substantial portions of the Software.
+%%
+%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+%% THE SOFTWARE.
+%% -------------------------------------------------------------------
+-module(proto_gpb_rt).
+-export([files/0,
+         run/1]).
+
+-include_lib("eunit/include/eunit.hrl").
+
+-define(MODULES,
+        [foo,
+         foo_app,
+         foo_sup]).
+
+-define(GENERATED_MODULES,
+        [test_gpb,
+         test2_gpb,
+         test3_gpb,
+         test4_gpb,
+         test5_gpb]).
+
+files() ->
+    [
+     {copy, "../../rebar", "rebar"},
+     {copy, "rebar.config", "rebar.config"},
+     {copy, "include", "include"},
+     {copy, "src", "src"},
+     {create, "ebin/foo.app", app(foo, ?MODULES ++ ?GENERATED_MODULES)}
+    ].
+
+run(_Dir) ->
+    ?assertMatch({ok, _}, retest_sh:run("./rebar prepare-deps", [])),
+    ?assertMatch({ok, _}, retest_sh:run("./rebar clean", [])),
+    ?assertMatch({ok, _}, retest_sh:run("./rebar compile", [])),
+    %% Foo includes test_gpb.hrl,
+    %% So if it compiled, that also means gpb succeeded in
+    %% generating the test_gpb.hrl file, and also that it generated
+    %% the .hrl file was generated before foo was compiled.
+    ok = check_beams_generated(),
+    ?assertMatch({ok, _}, retest_sh:run("./rebar clean", [])),
+    ok = check_files_deleted(),
+    ok.
+
+check_beams_generated() ->
+    check(fun filelib:is_regular/1,
+          beam_files()).
+
+check_files_deleted() ->
+    check(fun file_does_not_exist/1,
+          beam_files() ++ generated_erl_files() ++ generated_hrl_files()).
+
+beam_files() ->
+    add_dir("ebin", add_ext(?MODULES, ".beam")).
+
+generated_erl_files() ->
+    add_dir("src", add_ext(?GENERATED_MODULES, ".erl")).
+
+generated_hrl_files() ->
+    add_dir("include", add_ext(?GENERATED_MODULES, ".hrl")).
+
+file_does_not_exist(F) ->
+    not filelib:is_regular(F).
+
+add_ext(Modules, Ext) ->
+    [lists:concat([Module, Ext]) || Module <- Modules].
+
+add_dir(Dir, Files) ->
+    [filename:join(Dir, File) || File <- Files].
+
+check(Check, Files) ->
+    lists:foreach(
+      fun(F) ->
+              ?assertMatch({true, _}, {Check(F), F})
+      end,
+      Files).
+
+%%
+%% Generate the contents of a simple .app file
+%%
+app(Name, Modules) ->
+    App = {application, Name,
+           [{description, atom_to_list(Name)},
+            {vsn, "1"},
+            {modules, Modules},
+            {registered, []},
+            {applications, [kernel, stdlib, gpb]}]},
+    io_lib:format("~p.\n", [App]).

inttest/proto_gpb/rebar.config

@@ -0,0 +1,18 @@
+%% -*- mode: erlang;erlang-indent-level: 4;indent-tabs-mode: nil -*-
+%% ex: ts=4 sw=4 ft=erlang et
+
+{erl_opts,
+ [
+  {i, "deps/gpb/include"},
+  {platform_define, "R13|R14", 'NO_CALLBACK_ATTRIBUTE'}
+ ]}.
+
+{deps,
+ [
+  {gpb, [], {git, "git://github.com/tomas-abrahamsson/gpb",
+             {branch, "master"}}}
+ ]}.
+
+{proto_compiler, gpb}.
+
+{gpb_opts, [{module_name_suffix, "_gpb"}]}.

inttest/proto_gpb/src/a/b/test3.proto

@@ -0,0 +1,19 @@
+// -*- c-basic-offset: 4; indent-tabs-mode: nil -*-
+// ex: ts=4 sw=4 et
+
+package test3;
+
+service test3
+{
+    rpc testRpc3(RPC_INPUT3) returns (RPC_OUTPUT3);
+}
+
+message RPC_INPUT3
+{
+    optional string str = 1;
+}
+
+message RPC_OUTPUT3
+{
+    optional string str = 1;
+}

inttest/proto_gpb/src/a/test2.proto

@@ -0,0 +1,19 @@
+// -*- c-basic-offset: 4; indent-tabs-mode: nil -*-
+// ex: ts=4 sw=4 et
+
+package test2;
+
+service test2
+{
+    rpc testRpc2(RPC_INPUT2) returns (RPC_OUTPUT2);
+}
+
+message RPC_INPUT2
+{
+    optional string str = 1;
+}
+
+message RPC_OUTPUT2
+{
+    optional string str = 1;
+}

inttest/proto_gpb/src/c/d/test5.proto

@@ -0,0 +1,19 @@
+// -*- c-basic-offset: 4; indent-tabs-mode: nil -*-
+// ex: ts=4 sw=4 et
+
+package test5;
+
+service test5
+{
+    rpc testRpc5(RPC_INPUT5) returns (RPC_OUTPUT5);
+}
+
+message RPC_INPUT5
+{
+    optional string str = 1;
+}
+
+message RPC_OUTPUT5
+{
+    optional string str = 1;
+}

inttest/proto_gpb/src/c/test4.proto

@@ -0,0 +1,19 @@
+// -*- c-basic-offset: 4; indent-tabs-mode: nil -*-
+// ex: ts=4 sw=4 et
+
+package test4;
+
+service test4
+{
+    rpc testRpc4(RPC_INPUT4) returns (RPC_OUTPUT4);
+}
+
+message RPC_INPUT4
+{
+    optional string str = 1;
+}
+
+message RPC_OUTPUT4
+{
+    optional string str = 1;
+}

inttest/proto_gpb/src/foo.erl

@@ -0,0 +1,39 @@
+%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
+%% ex: ts=4 sw=4 et
+-module(foo).
+
+-export([start_link/0,
+         start_link/1,
+         init/1,
+         terminate/2,
+         handle_info/2,
+         handle_call/3,
+         handle_cast/2,
+         code_change/3]).
+
+-behavior(gen_server).
+
+-include("../include/test_gpb.hrl").
+-include("../include/test2_gpb.hrl").
+-include("../include/test3_gpb.hrl").
+-include("../include/test4_gpb.hrl").
+-include("../include/test5_gpb.hrl").
+
+-record(state, {node :: node()}).
+
+start_link() -> start_link(undefined).
+
+start_link(Args) ->
+    gen_server:start_link({local, ?MODULE}, ?MODULE, Args, []).
+
+init(_Args) -> {ok, #state{node=node()}}.
+
+terminate(_Reason, _Data) -> ok.
+
+handle_info(_Info, State) -> {noreply, State}.
+
+handle_cast(_Msg, State) -> {noreply, State}.
+
+handle_call(_Msg, _From, State) -> {reply, ok, State}.
+
+code_change(_OldVsn, State, _Extra) -> {ok, State}.

inttest/proto_gpb/src/foo_app.erl

@@ -0,0 +1,12 @@
+%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
+%% ex: ts=4 sw=4 et
+-module(foo_app).
+
+-behaviour(application).
+
+-export([start/2,
+         stop/1]).
+
+start(_Type, _Args) -> foo_sup:start_link().
+
+stop(_State) -> ok.

inttest/proto_gpb/src/foo_sup.erl

@@ -0,0 +1,15 @@
+%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
+%% ex: ts=4 sw=4 et
+-module(foo_sup).
+
+-behavior(supervisor).
+
+-export([start_link/0,
+         init/1]).
+
+start_link() ->
+    supervisor:start_link({local, ?MODULE}, ?MODULE, []).
+
+init(_Args) ->
+    FooChild = {foo,{foo, start_link, []}, permanent, 5000, worker, [foo]},
+    {ok,{{one_for_all,1,1}, [FooChild]}}.

inttest/proto_gpb/src/test.proto

@@ -0,0 +1,19 @@
+// -*- c-basic-offset: 4; indent-tabs-mode: nil -*-
+// ex: ts=4 sw=4 et
+
+package test;
+
+service test
+{
+    rpc testRpc(RPC_INPUT) returns (RPC_OUTPUT);
+}
+
+message RPC_INPUT
+{
+    optional string str = 1;
+}
+
+message RPC_OUTPUT
+{
+    optional string str = 1;
+}