Added simple plug-in for rebar to export EUnit coverage data

.gitignore

@@ -0,0 +1,2 @@
+deps/
+ebin/

covertool

@@ -104,7 +104,6 @@ generate_class(Module) ->
     {ok, Lines} = cover:analyse(Module, calls, line),
     {LinesData, Result} = lists:mapfoldl(Fun, #result{}, Lines),
 
-    % [{Line,{Cov,NotCov}}]
     Data = {class, [{name, Module},
                     {filename, lookup_source(Module)},
                     {'line-rate', rate(Result#result.line)},

rebar.config

@@ -0,0 +1,5 @@
+{deps_dir, ["deps"]}.
+{deps,
+    [
+        {rebar, ".*", {git, "https://github.com/basho/rebar.git"}}
+    ]}.

src/covertool.app.src

@@ -0,0 +1,11 @@
+{application, covertool,
+ [
+  {description, "Covertool Build Plugin"},
+  {vsn, "1"},
+  {registered, []},
+  {applications, [
+                  kernel,
+                  stdlib
+                 ]},
+  {env, []}
+ ]}.

src/rebar_covertool.erl

@@ -0,0 +1,14 @@
+-module(rebar_covertool).
+-include_lib("rebar/include/rebar.hrl").
+
+%% Application callbacks
+-export([eunit/2]).
+
+eunit(Config, _X) ->
+    Export = rebar_config:get_local(Config, cover_export, undefined),
+    case Export of
+        undefined -> ok;
+        File ->
+            ?CONSOLE("Exporting cover data to '~p'~n", [File]),
+            cover:export(File)
+    end.