1 files changed, 24 insertions, 23 deletions
diff --git a/src/rebar_prv_upgrade.erl b/src/rebar_prv_upgrade.erl
index 1c6abf7..cbeec98 100644
--- a/src/rebar_prv_upgrade.erl
+++ b/src/rebar_prv_upgrade.erl
@@ -19,31 +19,32 @@
 
 -spec init(rebar_state:t()) -> {ok, rebar_state:t()}.
 init(State) ->
-    State1 = rebar_state:add_provider(State, providers:create([{name, ?PROVIDER},
-                                                               {module, ?MODULE},
-                                                               {bare, false},
-                                                               {deps, ?DEPS},
-                                                               {example, "rebar upgrade cowboy"},
-                                                               {short_desc, "Upgrade dependency."},
-                                                               {desc, ""},
-                                                               {opts, []}])),
+    State1 =
+        rebar_state:add_provider(State,
+                                 providers:create([{name, ?PROVIDER},
+                                                   {module, ?MODULE},
+                                                   {bare, false},
+                                                   {deps, ?DEPS},
+                                                   {example, "rebar upgrade cowboy"},
+                                                   {short_desc, "Upgrade dependency."},
+                                                   {desc, ""},
+                                                   {opts, [
+                                                          {package, undefined, undefined, string, "Package to upgrade."}
+                                                          ]}])),
     {ok, State1}.
 
 -spec do(rebar_state:t()) -> {ok, rebar_state:t()} | {error, string()}.
 do(State) ->
-    case rebar_state:command_args(State) of
-        [Name] ->
-            ?INFO("Updating ~s~n", [Name]),
-            Locks = rebar_state:get(State, locks, []),
-            case lists:keyfind(ec_cnv:to_binary(Name), 1, Locks) of
-                {_, _, _, Level} ->
-                    Deps = rebar_state:get(State, deps),
-                    Dep = lists:keyfind(list_to_atom(Name), 1, Deps),
-                    rebar_prv_install_deps:handle_deps(State, [Dep], {true, ec_cnv:to_binary(Name), Level}),
-                    {ok, State};
-                false ->
-                    {error, io_lib:format("No such dependency ~s~n", [Name])}
-            end;
-        [] ->
-            {error, "No package given to upgrade."}
+    {Args, _} = rebar_state:command_parsed_args(State),
+    Name = proplists:get_value(package, Args),
+    ?INFO("Updating ~s~n", [Name]),
+    Locks = rebar_state:get(State, locks, []),
+    case lists:keyfind(ec_cnv:to_binary(Name), 1, Locks) of
+        {_, _, _, Level} ->
+            Deps = rebar_state:get(State, deps),
+            Dep = lists:keyfind(list_to_atom(Name), 1, Deps),
+            rebar_prv_install_deps:handle_deps(State, [Dep], {true, ec_cnv:to_binary(Name), Level}),
+            {ok, State};
+        _ ->
+            {error, io_lib:format("No such dependency ~s~n", [Name])}
     end.