add .coverdata file export (#298)

README.md

@@ -27,6 +27,7 @@ The following are example projects.
 Add the following parameters.
 
 - `test_coverage: [tool: ExCoveralls]` for using ExCoveralls for coverage reporting.
+- `test_coverage: [tool: ExCoveralls, export: "cov"]` for exporting data to `cover/cov.coverdata`
 - `preferred_cli_env: [coveralls: :test]` for running `mix coveralls` in `:test` env by default
     - It's an optional setting for skipping `MIX_ENV=test` part when executing `mix coveralls` tasks.
 - `test_coverage: [test_task: "espec"]` if you use Espec instead of default ExUnit.

lib/excoveralls.ex

@@ -36,14 +36,14 @@ defmodule ExCoveralls do
   @doc """
   This method will be called from mix to trigger coverage analysis.
   """
-  def start(compile_path, _opts) do
+  def start(compile_path, opts) do
     Cover.compile(compile_path)
     fn() ->
-      execute(ConfServer.get, compile_path)
+      execute(ConfServer.get, compile_path, opts)
     end
   end
 
-  def execute(options, compile_path) do
+  def execute(options, compile_path, opts) do
     stats = 
       Cover.modules() |> 
       Stats.report() |> 
@@ -55,6 +55,23 @@ defmodule ExCoveralls do
       Stats.update_paths(stats, options) |>
         analyze(options[:type] || "local", options)
     end
+  after
+    if name = opts[:export] do
+      export_coverdata_file(name, opts)
+    end
+  end
+
+  defp export_coverdata_file(name, opts) do
+    output = Keyword.get(opts, :output, "cover")
+    File.mkdir_p!(output)
+
+    case :cover.export('#{output}/#{name}.coverdata') do
+      :ok ->
+        Mix.shell().info("Coverage data exported.")
+
+      {:error, reason} ->
+        Mix.shell().error("Export failed with reason: #{inspect(reason)}")
+    end
   end
 
   defp store_stats(stats, options, compile_path) do

mix.exs

@@ -6,7 +6,7 @@ defmodule ExCoveralls.Mixfile do
   def project do
     [
       app: :excoveralls,
-      version: "0.15.1",
+      version: "0.15.2",
       elixir: "~> 1.3",
       elixirc_paths: elixirc_paths(Mix.env()),
       deps: deps(),