Merge pull request #375 from tsloughter/kejv-support-parse-transforms

enable parse transformations in rebar config

src/rebar_erlc_compiler.erl

@@ -161,7 +161,7 @@ doterl_compile(Config, Dir, OutDir, MoreSources, ErlOpts) ->
                                                 filename:extension(File) =:= ".erl"],
 
     NeededErlFiles = needed_files(G, ErlOpts, Dir, OutDir1, AllErlFiles),
-    ErlFirstFiles = erl_first_files(Config, Dir, NeededErlFiles),
+    {ErlFirstFiles, ErlOptsFirst} = erl_first_files(Config, ErlOpts, Dir, NeededErlFiles),
     {DepErls, OtherErls} = lists:partition(
                              fun(Source) -> digraph:in_degree(G, Source) > 0 end,
                              [File || File <- NeededErlFiles, not lists:member(File, ErlFirstFiles)]),
@@ -171,15 +171,36 @@ doterl_compile(Config, Dir, OutDir, MoreSources, ErlOpts) ->
     rebar_base_compiler:run(
       Config, FirstErls, OtherErls,
       fun(S, C) ->
-              internal_erl_compile(C, Dir, S, OutDir1, ErlOpts)
+              ErlOpts1 = case lists:member(S, ErlFirstFiles) of
+                             true -> ErlOptsFirst;
+                             false -> ErlOpts
+                         end,
+              internal_erl_compile(C, Dir, S, OutDir1, ErlOpts1)
       end),
     ok.
 
-erl_first_files(Config, Dir, NeededErlFiles) ->
+%% Get files which need to be compiled first, i.e. those specified in erl_first_files
+%% and parse_transform options.  Also produce specific erl_opts for these first
+%% files, so that yet to be compiled parse transformations are excluded from it.
+erl_first_files(Config, ErlOpts, Dir, NeededErlFiles) ->
     ErlFirstFilesConf = rebar_state:get(Config, erl_first_files, []),
-    %% NOTE: order of files in ErlFirstFiles is important!
-    [filename:join(Dir, File) || File <- ErlFirstFilesConf,
-                                 lists:member(filename:join(Dir, File), NeededErlFiles)].
+    NeededSrcDirs = lists:usort(lists:map(fun filename:dirname/1, NeededErlFiles)),
+    %% NOTE: order of files here is important!
+    ErlFirstFiles =
+        [filename:join(Dir, File) || File <- ErlFirstFilesConf,
+                                     lists:member(filename:join(Dir, File), NeededErlFiles)],
+    {ParseTransforms, ParseTransformsErls} =
+        lists:unzip(lists:flatmap(
+                      fun(PT) ->
+                              PTerls = [filename:join(D, module_to_erl(PT)) || D <- NeededSrcDirs],
+                              [{PT, PTerl} || PTerl <- PTerls, lists:member(PTerl, NeededErlFiles)]
+                      end, proplists:get_all_values(parse_transform, ErlOpts))),
+    ErlOptsFirst = lists:filter(fun({parse_transform, PT}) ->
+                                        not lists:member(PT, ParseTransforms);
+                                   (_) ->
+                                        true
+                               end, ErlOpts),
+    {ErlFirstFiles ++ ParseTransformsErls, ErlOptsFirst}.
 
 %% Get subset of SourceFiles which need to be recompiled, respecting
 %% dependencies induced by given graph G.

test/rebar_compile_SUITE.erl

@@ -19,7 +19,8 @@
          delete_beam_if_source_deleted/1,
          checkout_priority/1,
          compile_plugins/1,
-         highest_version_of_pkg_dep/1]).
+         highest_version_of_pkg_dep/1,
+         parse_transform_test/1]).
 
 -include_lib("common_test/include/ct.hrl").
 -include_lib("eunit/include/eunit.hrl").
@@ -46,7 +47,8 @@ all() ->
      build_all_srcdirs, recompile_when_hrl_changes,
      recompile_when_opts_change, dont_recompile_when_opts_dont_change,
      dont_recompile_yrl_or_xrl, delete_beam_if_source_deleted,
-     deps_in_path, checkout_priority, compile_plugins, highest_version_of_pkg_dep].
+     deps_in_path, checkout_priority, compile_plugins, highest_version_of_pkg_dep,
+     parse_transform_test].
 
 build_basic_app(Config) ->
     AppDir = ?config(apps, Config),
@@ -449,3 +451,24 @@ highest_version_of_pkg_dep(Config) ->
         Config, RConf, ["compile"],
         {ok, [{app, Name}, {dep, PkgName, <<"0.1.3">>}]}
     ).
+
+parse_transform_test(Config) ->
+    AppDir = ?config(apps, Config),
+
+    RebarConfig = [{erl_opts, [{parse_transform, pascal}]}],
+
+    Name = rebar_test_utils:create_random_name("app1_"),
+    Vsn = rebar_test_utils:create_random_vsn(),
+    rebar_test_utils:create_app(AppDir, Name, Vsn, [kernel, stdlib]),
+
+    ExtraSrc = <<"-module(pascal). "
+                 "-export([parse_transform/2]). "
+                 "parse_transform(Forms, _Options) -> "
+                 "Forms.">>,
+
+    ok = file:write_file(filename:join([AppDir, "src", "pascal.erl"]), ExtraSrc),
+
+    rebar_test_utils:run_and_check(Config, RebarConfig, ["compile"], {ok, [{app, Name}]}),
+
+    EbinDir = filename:join([AppDir, "_build", "default", "lib", Name, "ebin"]),
+    true = filelib:is_file(filename:join([EbinDir, "pascal.beam"])).