Adding first crack at reltool support

ebin/rebar.app

@@ -25,7 +25,9 @@
                            {app_modules, [ rebar_protobuffs_compiler,
                                            rebar_erlc_compiler,
                                            rebar_port_compiler,
-                                           rebar_otp_app ]}
+                                           rebar_otp_app ]},
+
+                           {rel_modules, [ rebar_reltool ]}
                            ]}
         ]}
 ]}.

src/rebar_core.erl

@@ -32,7 +32,7 @@
 %% Public API
 %% ===================================================================
 
-run(Args) ->
+run(Args) ->    
     %% Filter all the flags (i.e. string of form key=value) from the
     %% command line arguments. What's left will be the commands to run.
     Commands = filter_flags(Args, []),
@@ -100,6 +100,7 @@ find_targets(_Files, _Root, Acc, 10) ->
     Acc;
 find_targets([F | Rest], Root, Acc, Depth) ->
     AbsName = filename:join([Root, F]),
+    ?DEBUG("find_targets ~s ~s\n", [Root, F]),
     case target_type(AbsName) of
         undefined ->
             case filelib:is_dir(AbsName) of
@@ -123,23 +124,14 @@ target_type(AbsName) ->
             {app, AppFile};
         false ->
             case rebar_rel_utils:is_rel_dir(AbsName) of
-                true ->
-                    {rel, ""};
+                {true, ReltoolFile} ->
+                    {rel, ReltoolFile};
                 false ->
                     undefined
             end
     end.
 
 
-%%
-%% Given a command and target type, determine if the command is applicable
-%%
-valid_command(compile, app) -> true;
-valid_command(install, app) -> true;
-valid_command(clean, _Any)  -> true;
-valid_command(_, _)         -> false.
-
-
 %%
 %% Add all application targets to the front of the code path
 %%
@@ -148,6 +140,7 @@ update_code_path([]) ->
 update_code_path([{app, Dir, _} | Rest]) ->
     EbinDir = filename:join([Dir, "ebin"]),
     true = code:add_patha(EbinDir),
+    ?DEBUG("Adding ~s to code path\n", [EbinDir]),
     update_code_path(Rest);
 update_code_path([_ | Rest]) ->
     update_code_path(Rest).
@@ -159,10 +152,7 @@ apply_commands(Targets, [CommandStr | Rest]) ->
     %% Convert the command into an atom for convenience
     Command = list_to_atom(CommandStr),
 
-    %% Filter out all the targets, based on the specified command.
-    FilteredTargets = [{Type, Dir, Filename} || {Type, Dir, Filename} <- Targets,
-                                                valid_command(Command, Type) == true],
-    case catch(apply_command(FilteredTargets, Command)) of
+    case catch(apply_command(Targets, Command)) of
         ok ->
             apply_commands(Targets, Rest);
         Other ->
@@ -180,6 +170,7 @@ apply_command([{Type, Dir, File} | Rest], Command) ->
         [] ->
             ok;
         Subdirs ->
+            ?DEBUG("Subdirs: ~p\n", [Subdirs]),
             update_code_path(Subdirs),
             case apply_command(Subdirs, Command) of
                 ok ->
@@ -189,43 +180,50 @@ apply_command([{Type, Dir, File} | Rest], Command) ->
             end
     end,
 
-    %% Provide some info on where we are
-    ?CONSOLE("==> ~s (~s)\n", [filename:basename(Dir), Command]),
 
     %% Pull the list of modules that are associated with Type operations. Each module
     %% will be inspected for a function matching Command and if found, will execute that. 
-    Modules = rebar_config:get_modules(Config, Type),
-    case catch(run_modules(Modules, Command, Config, File)) of
-        ok ->
+    Modules = select_modules(rebar_config:get_modules(Config, Type), Command, []),
+    case Modules of
+        [] ->
+            %% None of the modules implement the command; move on to next target
             apply_command(Rest, Command);
-        Other ->
-            ?ERROR("~p failed while processing ~s: ~p", [Command, Dir, Other]),
-            error
+        _ ->
+            %% Provide some info on where we are
+            ?CONSOLE("==> ~s (~s)\n", [filename:basename(Dir), Command]),
+
+            %% Run the available modules
+            case catch(run_modules(Modules, Command, Config, File)) of
+                ok ->
+                    apply_command(Rest, Command);
+                Other ->
+                    ?ERROR("~p failed while processing ~s: ~p", [Command, Dir, Other]),
+                    error
+            end
     end.
 
-subdirs([], Acc) ->
-    Acc;
-subdirs([Dir | Rest], Acc) ->
-    Subdir = filename:join([rebar_utils:get_cwd(), Dir]),
-    subdirs(Rest, Acc ++ find_targets(Subdir)).
 
 
+subdirs(Dirs, Acc) ->
+    lists:reverse(find_targets(Dirs, rebar_utils:get_cwd(), [], 1)).
+
+select_modules([], _Command, Acc) ->
+    lists:reverse(Acc);
+select_modules([Module | Rest], Command, Acc) ->
+    Exports = Module:module_info(exports),
+    case lists:member({Command, 2}, Exports) of
+        true ->
+            select_modules(Rest, Command, [Module | Acc]);
+        false ->
+            select_modules(Rest, Command, Acc)
+    end.
+
 run_modules([], _Command, _Config, _File) ->
     ok;
 run_modules([Module | Rest], Command, Config, File) ->
-    case invoke_command(Module, Command, Config, File) of
+    case Module:Command(Config, File) of
         ok ->
             run_modules(Rest, Command, Config, File);
         {error, Reason} ->
             {error, Reason}
     end.
-
-invoke_command(Module, Command, Config, File) ->
-    Exports = Module:module_info(exports),
-    case lists:member({Command, 2}, Exports) of
-        true ->
-            Module:Command(Config, File);
-        false ->
-            ?DEBUG("Skipping ~s:~s/2 (not exported)\n", [Module, Command]),
-            ok
-    end.

src/rebar_rel_utils.erl

@@ -30,9 +30,10 @@ is_rel_dir() ->
     is_rel_dir(rebar_util:get_cwd()).
 
 is_rel_dir(Dir) ->
-    case filelib:wildcard("*.rel") of
-        [_File] ->
-            true;
-        _ ->
+    Fname = filename:join([Dir, "reltool.config"]),
+    case filelib:is_file(Fname) of
+        true ->
+            {true, Fname};
+        false ->
             false
     end.

src/rebar_reltool.erl

@@ -0,0 +1,97 @@
+%% -------------------------------------------------------------------
+%%
+%% rebar: Erlang Build Tools
+%%
+%% Copyright (c) 2009 Dave Smith (dizzyd@dizzyd.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(rebar_reltool).
+
+-export([generate/2,
+         clean/2]).
+
+-include("rebar.hrl").
+
+%% ===================================================================
+%% Public API
+%% ===================================================================
+
+generate(Config, ReltoolFile) ->
+    %% Load the reltool configuration from the file
+    case file:consult(ReltoolFile) of
+        {ok, [{sys, ReltoolConfig}]} ->
+            ok;
+        Other ->
+            ReltoolConfig = undefined,
+            ?ERROR("Failed to load expected config from ~s: ~p\n", [ReltoolFile, Other]),
+            ?FAIL
+    end,
+
+    case catch(run_reltool(Config, ReltoolConfig)) of
+        ok ->
+            ok;
+        {error, failed} ->
+            ?FAIL;
+        Other2 ->
+            ?ERROR("Unexpected error: ~p\n", [Other2]),
+            ?FAIL
+    end.
+
+
+clean(Config, ReltoolFile) ->
+    ok.
+
+
+
+%% ===================================================================
+%% Internal functions
+%% ===================================================================
+
+%%
+%% Determine the name of the target directory; try the user provided name
+%% first, or fall back to the release name if that's available. If neither
+%% is available, just use "target"
+%%
+target_dir(Config, ReltoolConfig) ->
+  case rebar_config:get(Config, target_name, undefined) of
+      undefined ->
+          case lists:keysearch(rel, 1, ReltoolConfig) of
+              {value, {rel, Name, _Vsn, _Apps}} ->
+                  Name;
+              false ->
+                  "target"
+          end;
+      Name ->
+          Name
+  end.
+
+run_reltool(Config, ReltoolConfig) ->
+    {ok, Server} = reltool:start_server([{sys, ReltoolConfig}]),
+    {ok, Spec} = reltool:get_target_spec(Server),
+    TargetDir = target_dir(Config, ReltoolConfig),
+    ok = file:make_dir(TargetDir),
+    case reltool:eval_target_spec(Spec, code:root_dir(), TargetDir) of
+        ok ->
+            ok;
+        {error, Reason} ->
+            ?ERROR("Failed to generate target from spec: ~p\n", [Reason]),
+            ?FAIL
+    end.
+