add upgrade provider

src/rebar_prv_upgrade.erl

@@ -0,0 +1,49 @@
+%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
+%% ex: ts=4 sw=4 et
+
+-module(rebar_prv_upgrade).
+
+-behaviour(rebar_provider).
+
+-export([init/1,
+         do/1]).
+
+-include("rebar.hrl").
+
+-define(PROVIDER, upgrade).
+-define(DEPS, [lock]).
+
+%% ===================================================================
+%% Public API
+%% ===================================================================
+
+-spec init(rebar_state:t()) -> {ok, rebar_state:t()}.
+init(State) ->
+    State1 = rebar_state:add_provider(State, #provider{name = ?PROVIDER,
+                                                       provider_impl = ?MODULE,
+                                                       bare = false,
+                                                       deps = ?DEPS,
+                                                       example = "rebar upgrade cowboy",
+                                                       short_desc = "Upgrade dependency.",
+                                                       desc = "",
+                                                       opts = []}),
+    {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."}
+    end.