Prototype CSV file upload

lib/mihainator_web/live/upload_live.ex

@@ -0,0 +1,39 @@
+defmodule MihainatorWeb.UploadLive do
+  use MihainatorWeb, :live_view
+
+  @impl Phoenix.LiveView
+  def mount(_params, _session, socket) do
+    {:ok,
+      socket
+      |> assign(:uploaded_files, [])
+      |> allow_upload(:avatar, accept: ~w(.csv .jpeg))}
+  end
+
+  @impl Phoenix.LiveView
+  def handle_event("validate", _params, socket) do
+    {:noreply, socket}
+  end
+
+  @impl Phoenix.LiveView
+  def handle_event("cancel-upload", %{"ref" => ref}, socket) do
+    {:noreply, cancel_upload(socket, :avatar, ref)}
+  end
+
+  @impl Phoenix.LiveView
+  def handle_event("save", _params, socket) do
+    uploaded_files =
+      consume_uploaded_entries(socket, :avatar, fn %{path: path}, _entry ->
+        line_count = File.stream!(path)
+        |> Enum.count()
+
+        IO.puts(line_count)
+
+        {:ok, line_count}
+      end)
+
+    {:noreply, update(socket, :uploaded_files, &(&1 ++ uploaded_files))}
+  end
+
+  defp error_to_string(:too_large), do: "Too large"
+  defp error_to_string(:not_accepted), do: "You have selected an unacceptable file type"
+end