add help

1 files changed, 55 insertions, 0 deletions

diff --git a/src/rebar_prv_upgrade.erl b/src/rebar_prv_upgrade.erl
new file mode 100644
index 0000000..1668e1c
--- /dev/null
+++ b/src/rebar_prv_upgrade.erl
@@ -0,0 +1,55 @@
+%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
+%% ex: ts=4 sw=4 et
+
+-module(rebar_prv_upgrade).
+
+-behaviour(provider).
+
+-export([init/1,
+         do/1,
+         format_error/2]).
+
+-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,
+                                 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) ->
+    {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.
+
+-spec format_error(any(), rebar_state:t()) ->  {iolist(), rebar_state:t()}.
+format_error(Reason, State) ->
+    {io_lib:format("~p", [Reason]), State}.