From ae40b253c00362907f275f01f53a39f6b0c600eb Mon Sep 17 00:00:00 2001
From: Tristan Sloughter <t@crashfast.com>
Date: Fri, 10 Oct 2014 18:40:08 -0500
Subject: handle unknown provider asked for help

---
 src/rebar_prv_help.erl | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/rebar_prv_help.erl b/src/rebar_prv_help.erl
index f3302c3..33bfa2c 100644
--- a/src/rebar_prv_help.erl
+++ b/src/rebar_prv_help.erl
@@ -39,9 +39,14 @@ do(State) ->
             help(State);
         Name ->
             Providers = rebar_state:providers(State),
-            providers:help(Name, Providers)
-    end,
-    {ok, State}.
+            case providers:get_provider(Name, Providers) of
+                [] ->
+                    {error, io_lib:format("Unknown task ~s", [Name])};
+                Provider ->
+                    providers:help(Provider),
+                    {ok, State}
+            end
+    end.
 
 %%
 %% print help/usage string
-- 
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