Fix shell hook expansion on windows

Dollar Variable expansion (`$VAR`) was inadvertently disabled for
windows variables, although %VARIABLES% already worked. This reduced the
portability of hooks in general.

Additionally, tests would fail on windows due to bad quoting of paths:
the path C:/a/b/c would fail when passed to the command
`cmd /q /c C:/a/b/c` because it would interpret /a /b and /c as 3
options. Using quotes makes the tests pass.

src/rebar_utils.erl

@@ -156,7 +156,7 @@ sh_send(Command0, String, Options0) ->
     Options = [expand_sh_flag(V)
                || V <- proplists:compact(Options0 ++ DefaultOptions)],
 
-    Command = lists:flatten(patch_on_windows(Command0, proplists:get_value(env, Options, []))),
+    Command = lists:flatten(patch_on_windows(Command0, proplists:get_value(env, Options0, []))),
     PortSettings = proplists:get_all_values(port_settings, Options) ++
         [exit_status, {line, 16384}, use_stdio, stderr_to_stdout, hide],
     Port = open_port({spawn, Command}, PortSettings),
@@ -187,7 +187,7 @@ sh(Command0, Options0) ->
     ErrorHandler = proplists:get_value(error_handler, Options),
     OutputHandler = proplists:get_value(output_handler, Options),
 
-    Command = lists:flatten(patch_on_windows(Command0, proplists:get_value(env, Options, []))),
+    Command = lists:flatten(patch_on_windows(Command0, proplists:get_value(env, Options0, []))),
     PortSettings = proplists:get_all_values(port_settings, Options) ++
         [exit_status, {line, 16384}, use_stdio, stderr_to_stdout, hide, eof],
     ?DEBUG("Port Cmd: ~ts\nPort Opts: ~p\n", [Command, PortSettings]),

test/rebar_hooks_SUITE.erl

@@ -84,7 +84,7 @@ run_hooks_once(Config) ->
 
     Name = rebar_test_utils:create_random_name("app1_"),
     Vsn = rebar_test_utils:create_random_vsn(),
-    RebarConfig = [{pre_hooks, [{compile, "mkdir  $REBAR_ROOT_DIR/blah"}]}],
+    RebarConfig = [{pre_hooks, [{compile, "mkdir  \"$REBAR_ROOT_DIR/blah\""}]}],
     rebar_test_utils:create_config(AppDir, RebarConfig),
     rebar_test_utils:create_app(AppDir, Name, Vsn, [kernel, stdlib]),
     rebar_test_utils:run_and_check(Config, RebarConfig, ["compile"], {ok, [{app, Name, valid}]}).
@@ -96,7 +96,7 @@ run_hooks_once_profiles(Config) ->
 
     Name = rebar_test_utils:create_random_name("app1_"),
     Vsn = rebar_test_utils:create_random_vsn(),
-    RebarConfig = [{profiles, [{hooks, [{pre_hooks, [{compile, "mkdir $REBAR_ROOT_DIR/blah"}]}]}]}],
+    RebarConfig = [{profiles, [{hooks, [{pre_hooks, [{compile, "mkdir \"$REBAR_ROOT_DIR/blah\""}]}]}]}],
     rebar_test_utils:create_config(AppDir, RebarConfig),
     rebar_test_utils:create_app(AppDir, Name, Vsn, [kernel, stdlib]),
     rebar_test_utils:run_and_check(Config, RebarConfig, ["as", "hooks", "compile"], {ok, [{app, Name, valid}]}).
@@ -236,7 +236,7 @@ root_hooks(Config) ->
     rebar_test_utils:create_app(SubAppsDir, Name, Vsn, [kernel, stdlib]),
     rebar_test_utils:create_config(SubAppsDir, [{provider_hooks, [{post, [{compile, clean}]}]}]),
 
-    RConfFile = rebar_test_utils:create_config(AppDir, [{pre_hooks, [{compile, "mkdir $REBAR_ROOT_DIR/blah"}]}]),
+    RConfFile = rebar_test_utils:create_config(AppDir, [{pre_hooks, [{compile, "mkdir \"$REBAR_ROOT_DIR/blah\""}]}]),
     {ok, RConf} = file:consult(RConfFile),
 
     %% Build with deps.