add deleted toggle to main search form

lib/philomena/schema/search.ex

@@ -1,10 +1,10 @@
 defmodule Philomena.Schema.Search do
   alias Philomena.Images.Query
-  import Search.String
+  alias Search.String
   import Ecto.Changeset
 
   def validate_search(changeset, field, user, watched \\ false) do
-    query = changeset |> get_field(field) |> normalize()
+    query = changeset |> get_field(field) |> String.normalize()
     output = Query.compile(user, query, watched)
 
     case output do

lib/philomena_web/templates/search/_form.html.slime

@@ -129,5 +129,15 @@ h1 Search
         "Ascending": :asc
       ]
 
+      sort_hidden = [
+        "Exclude Deleted": "",
+        "Include Deleted/Merged": "1",
+        "Deleted Only": "deleted",
+        "Deleted/Merged Only": "only"
+      ]
+
     = select f, :sf, sort_fields, class: "input input--separate-left", name: "sf", autocomplete: "off", selected: @conn.params["sf"]
-    = select f, :sd, sort_directions, class: "input input--separate-left", name: "sd", autocomplete: "off", selected: @conn.params["sd"]
+    = select f, :sd, sort_directions, class: "input input--separate-left", name: "sd", autocomplete: "off", selected: @conn.params["sd"]
+
+    = if hides_images?(@conn) do
+      = select f, :del, sort_hidden, class: "input input--separate-left", name: "del", autocomplete: "off", selected: @conn.params["del"]

lib/philomena_web/views/search_view.ex

@@ -2,4 +2,5 @@ defmodule PhilomenaWeb.SearchView do
   use PhilomenaWeb, :view
 
   def scope(conn), do: Philomena.ImageScope.scope(conn)
+  def hides_images?(conn), do: can?(conn, :hide, %Philomena.Images.Image{})
 end