change the web layer according to previous refactoring add template t…

…o render the chunk

lib/diff_web/controllers/page_controller.ex

@@ -28,18 +28,13 @@ defmodule DiffWeb.PageController do
     end
   end
 
-  def expand_context(conn, %{"file_name" => file_name} = params) do
-    %{
-      "version" => version,
-      "package" => package,
-      "from_line" => from_line,
-      "direction" => direction
-    } = params
-
-    case parse_version(version) do
+  def expand_context(conn, %{"file_name" => _file_name} = params) do
+    case parse_version(params["version"]) do
       {:ok, version} ->
         version = to_string(version)
-        do_expand_context(conn, package, version, file_name, from_line, direction)
+        params = Map.update!(params, "version", fn _ -> version end)
+
+        do_expand_context(conn, params)
 
       :error ->
         conn
@@ -96,10 +91,22 @@ defmodule DiffWeb.PageController do
     end
   end
 
-  defp do_expand_context(conn, package, version, file_name, from_line, direction) do
-    case Diff.Hex.get_chunk(package, version, file_name, from_line, direction) do
+  defp do_expand_context(conn, params) do
+    chunk_extractor_params =
+      for {key, val} <- params, into: %{} do
+        {String.to_existing_atom(key), val}
+      end
+
+    case Diff.Hex.get_chunk(chunk_extractor_params) do
       {:ok, chunk} ->
-        json(conn, %{chunk: chunk})
+        rendered_chunk =
+          Phoenix.View.render_to_string(DiffWeb.RenderView, "render_context_chunk.html",
+            chunk: chunk
+          )
+
+        conn
+        |> put_status(200)
+        |> json(%{chunk: rendered_chunk, lines: length(chunk)})
 
       {:error, %{errors: errors}} ->
         conn

lib/diff_web/router.ex

@@ -15,7 +15,11 @@ defmodule DiffWeb.Router do
     pipe_through :browser
 
     live "/", SearchLiveView
-    get "/diff/:package/:version/expand/:from_line/:direction", PageController, :expand_context
+
+    get "/diff/:package/:version/expand/:from_line/:to_line/:right_line/",
+        PageController,
+        :expand_context
+
     get "/diff/:package/:versions", PageController, :diff
     get "/diffs", PageController, :diffs
   end

lib/diff_web/templates/render/render_context_chunk.html.eex

@@ -0,0 +1,15 @@
+<%= for line <- @chunk do %>
+  <tr class="ghd-line ghd-line-type-context expanded">
+    <td class="ghd-line-number">
+      <div class="ghd-line-number-from">
+        <%= line_number(line.from_line_number) %>
+      </div>
+      <div class="ghd-line-number-to">
+        <%= line_number(line.to_line_number) %>
+      </div>
+    </td>
+    <td class="ghd-text">
+      <div class="ghd-text-internal"><%= line_text(line.text) %></div>
+    </td>
+  </tr>
+<% end %>

test/diff_web/controllers/page_controller_test.exs

@@ -42,35 +42,23 @@ defmodule DiffWeb.PageControllerTest do
     end
   end
 
-  describe "/GET /diff/:package/:versions/expand/:from_line/:direction" do
+  describe "/GET /diff/:package/:versions/expand/:from/:to/:right_line" do
     setup :verify_on_exit!
 
     test "requires file_name query param", %{conn: conn} do
-      conn = get(conn, "/diff/phoenix/1.4.5/expand/1/down")
+      conn = get(conn, "/diff/phoenix/1.4.5/expand/1/1/1")
       assert %{"error" => "missing query parameter: file_name"} = json_response(conn, 400)
     end
 
-    test "doesn't accept direction other that up or down", %{conn: conn} do
-      conn = get(conn, "/diff/phoenix/1.4.5/expand/1/left?file_name=mix.exs")
-      assert %{"errors" => %{"direction" => error}} = json_response(conn, 400)
-      assert error =~ ~r/direction must be either \"up\" or \"down\"/
-    end
-
-    test "doesn't accept negative from_line", %{conn: conn} do
-      conn = get(conn, "/diff/phoenix/1.4.5/expand/-2/up?file_name=mix.exs")
+    test "doesn't accept when to_line is less than from_line", %{conn: conn} do
+      conn = get(conn, "/diff/phoenix/1.4.5/expand/2/1/1?file_name=mix.exs")
       assert json_response(conn, 400)
     end
 
     test "returns chunk of the file", %{conn: conn} do
-      conn = get(conn, "/diff/phoenix/1.4.5/expand/2/up?file_name=mix.exs")
+      conn = get(conn, "/diff/phoenix/1.4.5/expand/1/4/1?file_name=mix.exs")
       assert %{"chunk" => chunk} = json_response(conn, 200)
-
-      assert [
-               %{"line_text" => "defmodule Phoenix.MixProject do"},
-               %{"line_text" => "  use Mix.Project"}
-             ] = chunk
-
-      assert 2 = length(chunk)
+      assert chunk =~ "defmodule Phoenix.MixProject do"
     end
   end
 end