From 83cece0f80ccf18f8fb9d41a5052d82ea025a3ec Mon Sep 17 00:00:00 2001
From: Dan Gudmundsson <dgud@erlang.org>
Date: Sat, 18 Sep 2010 16:34:19 -0600
Subject: [PATCH] Basic tweaks for compiling ports/nifs on mingw

---
 src/rebar_port_compiler.erl | 21 ++++++++++++++++++++-
 src/rebar_utils.erl         | 23 +++++++++++++++++++++--
 2 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/src/rebar_port_compiler.erl b/src/rebar_port_compiler.erl
index de3950e..d07b369 100644
--- a/src/rebar_port_compiler.erl
+++ b/src/rebar_port_compiler.erl
@@ -307,7 +307,8 @@ erts_dir() ->
     lists:concat([code:root_dir(), "/erts-", erlang:system_info(version)]).
 
 os_env() ->
-    [list_to_tuple(re:split(S, "=", [{return, list}, {parts, 2}])) || S <- os:getenv()].
+    Os = [list_to_tuple(re:split(S, "=", [{return, list}, {parts, 2}])) || S <- os:getenv()],
+    lists:keydelete([],1,Os). %% Remove Windows current disk and path
 
 default_env() ->
     [
@@ -344,6 +345,24 @@ source_to_bin(Source) ->
     filename:rootname(Source, Ext) ++ ".o".
 
 so_specs(Config, AppFile, Bins) ->
+    Specs = make_so_specs(Config, AppFile, Bins),
+    case os:type() of
+        {win32, nt} ->
+            [switch_so_to_dll(SoSpec) || SoSpec <- Specs];
+        _ ->
+            Specs
+    end.
+
+switch_so_to_dll(Orig = {Name, Spec}) ->
+    case filename:extension(Name) of
+        ".so" ->
+            {filename:rootname(Name, ".so") ++ ".dll", Spec};
+        _ ->
+            %% Not a .so; leave it
+            Orig
+    end.
+
+make_so_specs(Config, AppFile, Bins) ->
     case rebar_config:get(Config, so_specs, undefined) of
         undefined ->
             %% New form of so_specs is not provided. See if the old form of {so_name} is available
diff --git a/src/rebar_utils.erl b/src/rebar_utils.erl
index 95981a3..056618b 100644
--- a/src/rebar_utils.erl
+++ b/src/rebar_utils.erl
@@ -77,8 +77,9 @@ get_os() ->
 sh(Command, Env) ->
     sh(Command, Env, get_cwd()).
 
-sh(Command, Env, Dir) ->
-    ?INFO("sh: ~s\n~p\n", [Command, Env]),
+sh(Command0, Env, Dir) ->
+    ?INFO("sh: ~s\n~p\n", [Command0, Env]),
+    Command = patch_on_windows(Command0, os:type()),
     Port = open_port({spawn, Command}, [{cd, Dir}, {env, Env}, exit_status, {line, 16384},
                                         use_stdio, stderr_to_stdout]),
     case sh_loop(Port) of
@@ -88,6 +89,18 @@ sh(Command, Env, Dir) ->
             ?ABORT("~s failed with error: ~w\n", [Command, Rc])
     end.
 
+
+%% We need a bash shell to execute on windows
+%% also the port doesn't seem to close from time to time (mingw)
+patch_on_windows(Cmd, {win32,nt}) ->
+    case os:find_executable(bash) of
+        false -> Cmd;
+        Bash -> 
+            Bash ++ " -c \"" ++ Cmd ++ "; echo _port_cmd_status_ $?\" "
+    end;
+patch_on_windows(Command, _) ->
+    Command.
+
 sh_failfast(Command, Env) ->
     sh(Command, Env).
 
@@ -145,6 +158,12 @@ match_first([{Regex, MatchValue} | Rest], Val) ->
 
 sh_loop(Port) ->
     receive
+        {Port, {data, {_, "_port_cmd_status_ " ++ Status}}} ->
+            (catch erlang:port_close(Port)), % sigh () for indentation
+            case list_to_integer(Status) of
+                0  -> ok;
+                Rc -> {error, Rc}
+            end;
         {Port, {data, {_, Line}}} ->
             ?CONSOLE("~s\n", [Line]),
             sh_loop(Port);