From e52bb6783c34e1bacd419d787ee8fbad0a394624 Mon Sep 17 00:00:00 2001
From: Dave Smith <dizzyd@dizzyd.com>
Date: Wed, 25 Nov 2009 16:03:14 -0700
Subject: Getting basic erlang compilation working

---
 include/rebar.hrl             |  2 ++
 priv/rebar                    |  2 +-
 src/rebar_config.erl          | 12 +++++++-
 src/rebar_doterl_compiler.erl | 65 +++++++++++++++++++++++++++++++++++++++++--
 4 files changed, 76 insertions(+), 5 deletions(-)

diff --git a/include/rebar.hrl b/include/rebar.hrl
index 2584f9d..4b75577 100644
--- a/include/rebar.hrl
+++ b/include/rebar.hrl
@@ -2,3 +2,5 @@
 -record(global_state, { working_dir }).
 
 -define(CONSOLE(Str, Args), io:format(Str, Args)).
+
+-define(FAIL, throw({error, failed})).
diff --git a/priv/rebar b/priv/rebar
index b30a722..f911966 100755
--- a/priv/rebar
+++ b/priv/rebar
@@ -136,7 +136,7 @@ apply_command([{Type, Dir, File} | Rest], Command) ->
         ok ->
             apply_command(Rest, Command);
         Other ->
-            ?CONSOLE("Execution of ~p failed while processing ~s: ~p", [Command, Dir, Other])
+            ?CONSOLE("~p failed while processing ~s: ~p", [Command, Dir, Other])
     end.
 
 
diff --git a/src/rebar_config.erl b/src/rebar_config.erl
index a6ad5b2..077de75 100644
--- a/src/rebar_config.erl
+++ b/src/rebar_config.erl
@@ -25,7 +25,8 @@
 -module(rebar_config).
 
 -export([new/1,
-         get_modules/2]).
+         get_modules/2,
+         get_list/3]).
 
 -record(config, { dir,
                   opts }).
@@ -42,3 +43,12 @@ get_modules(Config, app) ->
         {ok, Modules} ->
             Modules
     end.
+
+get_list(Config, Key, Default) ->
+    case orddict:find(Key, Config#config.opts) of
+        error ->
+            Default;
+        {ok, List} ->
+            List
+    end.
+    
diff --git a/src/rebar_doterl_compiler.erl b/src/rebar_doterl_compiler.erl
index 91828cd..cf345cd 100644
--- a/src/rebar_doterl_compiler.erl
+++ b/src/rebar_doterl_compiler.erl
@@ -34,13 +34,72 @@
 %% ===================================================================
 
 compile(Config, Dir) ->
-    io:format(".erl compiling: ~s\n", [Dir]),
-    ok.
+    do_compile(Config, "src/*.erl", "ebin", ".erl", ".beam",
+               fun compile_erl/2),
+    do_compile(Config, "mibs/*.mib", "priv/mibs", ".mib", ".bin",
+               fun compile_mib/2).
 
 clean(Config, Dir) ->
-    rebar_utils:delete_files("ebin/*.beam").
+%    rebar_utils:delete_files("ebin/*.beam"),
+%    rebar_utils:delete_files("priv/mibs/*.bin").
+    ok.
 
 
 %% ===================================================================
 %% Internal functions
 %% ===================================================================
+
+do_compile(Config, SrcWildcard, OutDir, InExt, OutExt, CompileFn) ->
+    case filelib:wildcard(SrcWildcard) of
+        [] ->
+            ok;
+        Srcs when is_list(Srcs) ->
+            %% Build list of output files
+            Targets = [target_file(S, OutDir, InExt, OutExt) || S <- Srcs],
+            Files = lists:zip(Targets, Srcs),
+            
+            %% Make sure target directory exists
+            ok = filelib:ensure_dir(hd(Targets)),
+            
+            %% Start compiling
+            compile_each(Files, Config, CompileFn)
+    end.
+
+
+compile_each([], _Config, _CompileFn) ->
+    ok;
+compile_each([{Target, Src} | Rest], Config, CompileFn) ->
+    case needs_compile(Target, Src) of
+        true ->
+            ?CONSOLE("Compiling ~s\n", [Src]),
+            CompileFn(Src, Config);
+        false ->
+            ok
+    end,
+    compile_each(Rest, Config, CompileFn).
+            
+needs_compile(Target, Src) ->
+    filelib:last_modified(Target) < filelib:last_modified(Src).
+
+
+target_file(F, TargetDir, InExt, OutExt) ->
+    filename:join([TargetDir, filename:basename(F, InExt) ++ OutExt]).
+
+
+compile_erl(Source, Config) ->
+    Opts = rebar_config:get_list(Config, erlc_opts, []),
+    case compile:file(Source, [{i, "include"}, {outdir, "ebin"}, report] ++ Opts) of
+        {ok, _} ->
+            ok;
+        error ->
+            ?FAIL
+    end.
+
+compile_mib(Source, Config) ->
+    Opts = meab_config:get_list(mibc_opts, []),
+    case snmpc:compile(Source, [{outdir, "priv/mibs"}, {i, ["priv/mibs"]}] ++ Opts) of
+        {ok, _} ->
+            ok;
+        {error, compilation_failed} ->
+            ?FAIL
+    end.
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