Get path from config in mix task

lib/mix/tasks/pandoc.ex

@@ -1,6 +1,8 @@
 defmodule Mix.Tasks.Pandoc do
   use Mix.Task
 
+  @ext ".md"
+
   @impl true
   def run(args) do
     switches = [runtime_config: :boolean]
@@ -17,15 +19,17 @@ defmodule Mix.Tasks.Pandoc do
     install_and_run(remaining_args)
   end
 
-  defp install_and_run([profile | args] = _all) do
-    IO.puts("mix task args #{inspect(args)}")
+  defp install_and_run([profile | _args] = all) do
+    IO.puts("Converting markdown...")
 
-    "documents"
-    |> File.ls!()
+    profile = String.to_atom(profile)
+    config = Application.get_env(:pandoc, profile)
+
+    (config[:cd] || File.cwd!())
+    |> Path.join("*#{@ext}")
+    |> Path.wildcard()
     |> Enum.each(fn path ->
-      all = [profile, path]
-
-      case Pandoc.run(String.to_atom(profile), [path]) do
+      case Pandoc.run(profile, Path.basename(path)) do
         0 -> :ok
         status -> Mix.raise("`mix pandoc #{Enum.join(all, " ")}` exited with #{status}")
       end