recompile files if their "includes" have changed

added parameter to do_compile for passing a function that can extra the list of includes from a file

src/rebar_erlc_compiler.erl

@@ -28,7 +28,7 @@
          clean/2]).
 
  %% make available for rebar_eunit until there is a better option
--export([do_compile/7, compile_opts/2]).
+-export([do_compile/8, compile_opts/2]).
 
 -include("rebar.hrl").
 
@@ -38,10 +38,10 @@
 
 compile(Config, _AppFile) ->
     do_compile(Config, "src/*.erl", "ebin", ".erl", ".beam",
-               fun compile_erl/2,
+               fun list_hrls/2, fun compile_erl/2,
                rebar_config:get_list(Config, erl_first_files, [])),
     do_compile(Config, "mibs/*.mib", "priv/mibs", ".mib", ".bin",
-               fun compile_mib/2,
+               undefined, fun compile_mib/2,
                rebar_config:get_list(Config, mib_first_files, [])).
 
 clean(_Config, _AppFile) ->
@@ -57,7 +57,8 @@ clean(_Config, _AppFile) ->
 %% Internal functions
 %% ===================================================================
 
-do_compile(Config, SrcWildcard, OutDir, InExt, OutExt, CompileFn, FirstFiles) ->
+do_compile(Config, SrcWildcard, OutDir, InExt, OutExt,
+           IncludeFn, CompileFn, FirstFiles) ->
     case filelib:wildcard(SrcWildcard) of
         [] ->
             ok;
@@ -72,14 +73,14 @@ do_compile(Config, SrcWildcard, OutDir, InExt, OutExt, CompileFn, FirstFiles) ->
             ok = filelib:ensure_dir(target_file(hd(FoundFiles), OutDir, InExt, OutExt)),
 
             %% Compile first targets in sequence
-            compile_each(FirstTargets, Config, CompileFn),
+            compile_each(FirstTargets, Config, IncludeFn, CompileFn),
             
             %% Spin up workers
             Self = self(),
             Pids = [spawn_monitor(fun() -> compile_worker(Self) end) || _I <- lists:seq(1,3)],
 
             %% Process rest of targets
-            compile_queue(Pids, RestTargets, Config, CompileFn)
+            compile_queue(Pids, RestTargets, Config, IncludeFn, CompileFn)
     end.
 
 drop_each([], List) ->
@@ -87,10 +88,10 @@ drop_each([], List) ->
 drop_each([Member | Rest], List) ->
     drop_each(Rest, lists:delete(Member, List)).
 
-compile_each([], _Config, _CompileFn) ->
+compile_each([], _Config, _IncludeFn, _CompileFn) ->
     ok;
-compile_each([{Src, Target} | Rest], Config, CompileFn) ->
-    case needs_compile(Src, Target) of
+compile_each([{Src, Target} | Rest], Config, IncludeFn, CompileFn) ->
+    case needs_compile(Src, Target, IncludeFn, Config) of
         true ->
             ?CONSOLE("Compiling ~s\n", [Src]),
             CompileFn(Src, Config);
@@ -98,11 +99,23 @@ compile_each([{Src, Target} | Rest], Config, CompileFn) ->
             ?INFO("Skipping ~s\n", [Src]),
             ok
     end,
-    compile_each(Rest, Config, CompileFn).
+    compile_each(Rest, Config, IncludeFn, CompileFn).
             
-needs_compile(Src, Target) ->
-    filelib:last_modified(Target) < filelib:last_modified(Src).
-
+needs_compile(Src, Target, IncludeFn, Config) ->
+    TargetLM = filelib:last_modified(Target),
+    case TargetLM < filelib:last_modified(Src) of
+        true ->
+            true;
+        false ->
+            if is_function(IncludeFn) ->
+                    lists:any(fun(I) ->
+                                      TargetLM < filelib:last_modified(I)
+                              end,
+                              IncludeFn(Src, Config));
+               true ->
+                    false
+            end
+    end.
 
 target_file(F, TargetDir, InExt, OutExt) ->
     filename:join([TargetDir, filename:basename(F, InExt) ++ OutExt]).
@@ -110,6 +123,33 @@ target_file(F, TargetDir, InExt, OutExt) ->
 compile_opts(Config, Key) ->
     rebar_config:get_list(Config, Key, []).
 
+list_hrls(Src, Config) ->
+    case epp:open(Src, include_path(Src, Config)) of
+        {ok, Epp} -> 
+            %% check include for erlang files
+            extract_includes(Epp, Src);
+        _ ->
+            false
+    end.
+
+include_path(Src, Config) ->
+    [filename:dirname(Src)|compile_opts(Config, i)].
+
+extract_includes(Epp, Src) ->
+    case epp:parse_erl_form(Epp) of
+	{ok, {attribute, 1, file, {Src, 1}}} ->
+	    extract_includes(Epp, Src);
+	{ok, {attribute, 1, file, {IncFile, 1}}} ->
+            [IncFile|extract_includes(Epp, Src)];
+	{ok, _} ->
+	    extract_includes(Epp, Src);
+	{eof, _} ->
+	    epp:close(Epp),
+	    [];
+	{error, _Error} ->
+	    extract_includes(Epp, Src)
+    end.
+
 compile_erl(Source, Config) ->
     Opts = [{i, "include"}, {outdir, "ebin"}, report, return] ++ compile_opts(Config, erl_opts),
     case compile:file(Source, Opts) of
@@ -136,18 +176,18 @@ compile_mib(Source, Config) ->
             ?FAIL
     end.
 
-compile_queue([], [], _Config, _CompileFn) ->
+compile_queue([], [], _Config, _IncludeFn, _CompileFn) ->
     ok;
-compile_queue(Pids, Targets, Config, CompileFn) ->
+compile_queue(Pids, Targets, Config, IncludeFn, CompileFn) ->
     receive
         {next, Worker} ->
             case Targets of
                 [] ->
                     Worker ! empty,
-                    compile_queue(Pids, Targets, Config, CompileFn);
+                    compile_queue(Pids, Targets, Config, IncludeFn, CompileFn);
                 [{Src, Target} | Rest] ->
-                    Worker ! {compile, Src, Target, Config, CompileFn},
-                    compile_queue(Pids, Rest, Config, CompileFn)
+                    Worker ! {compile, Src, Target, Config, IncludeFn, CompileFn},
+                    compile_queue(Pids, Rest, Config, IncludeFn, CompileFn)
             end;
 
         {fail, Error} ->
@@ -156,12 +196,12 @@ compile_queue(Pids, Targets, Config, CompileFn) ->
         
         {compiled, Source} ->
             ?CONSOLE("Compiled ~s\n", [Source]),
-            compile_queue(Pids, Targets, Config, CompileFn);
+            compile_queue(Pids, Targets, Config, IncludeFn, CompileFn);
         
         {'DOWN', Mref, _, Pid, normal} ->
             ?DEBUG("Worker exited cleanly\n", []),
             Pids2 = lists:delete({Pid, Mref}, Pids),
-            compile_queue(Pids2, Targets, Config, CompileFn);
+            compile_queue(Pids2, Targets, Config, IncludeFn, CompileFn);
         
         {'DOWN', _Mref, _, _Pid, Info} ->
             ?DEBUG("Worker failed: ~p\n", [Info]),
@@ -171,8 +211,8 @@ compile_queue(Pids, Targets, Config, CompileFn) ->
 compile_worker(QueuePid) ->
     QueuePid ! {next, self()},
     receive
-        {compile, Src, Target, Config, CompileFn} ->
-            case needs_compile(Src, Target) of
+        {compile, Src, Target, Config, IncludeFn, CompileFn} ->
+            case needs_compile(Src, Target, IncludeFn, Config) of
                 true ->
                     case catch(CompileFn(Src, Config)) of
                         ok ->

src/rebar_eunit.erl

@@ -51,7 +51,7 @@ eunit(Config, _File) ->
 
     %% Compile all erlang from src/ into ?EUNIT_DIR
     rebar_erlc_compiler:do_compile(Config, "src/*.erl", ?EUNIT_DIR, ".erl", ".beam",
-                                   fun compile_erl/2,
+                                   undefined, fun compile_erl/2,
                                    rebar_config:get_list(Config, erl_first_files, [])),
 
     %% Build a list of all the .beams in ?EUNIT_DIR -- use this for cover

src/rebar_lfe_compiler.erl

@@ -37,7 +37,7 @@
 compile(Config, _AppFile) ->
     FirstFiles = rebar_config:get_list(Config, lfe_first_files, []),
     rebar_erlc_compiler:do_compile(Config, "src/*.lfe", "ebin", ".lfe", ".beam",
-                                   fun compile_lfe/2, FirstFiles).
+                                   undefined, fun compile_lfe/2, FirstFiles).
 
 
 %% ===================================================================