Add <hr/> support to options_for_select

lib/phoenix_html/form.ex

@@ -297,6 +297,21 @@ defmodule Phoenix.HTML.Form do
       #=>   <option>France</option>
       #=> </optgroup>
 
+  Horizontal separators can be added:
+
+      options_for_select(["Admin", "User", :hr, "New"], nil)
+      #=> <option>Admin</option>
+      #=> <option>User</option>
+      #=> <hr/>
+      #=> <option>New</option>
+
+      options_for_select(["Admin": "admin", "User": "user", hr: nil, "New": "new"], nil)
+      #=> <option value="admin" selected>Admin</option>
+      #=> <option value="user">User</option>
+      #=> <hr/>
+      #=> <option value="new">New</option>
+
+
   """
   def options_for_select(options, selected_values) do
     {:safe,
@@ -308,6 +323,9 @@ defmodule Phoenix.HTML.Form do
 
   defp escaped_options_for_select(options, selected_values) do
     Enum.reduce(options, [], fn
+      {:hr, nil}, acc ->
+        [acc | hr_tag()]
+
       {option_key, option_value}, acc ->
         [acc | option(option_key, option_value, [], selected_values)]
 
@@ -326,6 +344,9 @@ defmodule Phoenix.HTML.Form do
 
         [acc | option(option_key, option_value, options, selected_values)]
 
+      :hr, acc ->
+        [acc | hr_tag()]
+
       option, acc ->
         [acc | option(option, option, [], selected_values)]
     end)
@@ -349,6 +370,10 @@ defmodule Phoenix.HTML.Form do
     [?<, name, attrs, ?>, body, ?<, ?/, name, ?>]
   end
 
+  defp hr_tag() do
+    [?<, "hr", ?/, ?>]
+  end
+
   # Helper for getting field errors, handling string fields
   defp field_errors(errors, field)
        when is_list(errors) and (is_atom(field) or is_binary(field)) do

test/phoenix_html/form_test.exs

@@ -252,31 +252,40 @@ defmodule Phoenix.HTML.FormTest do
                ~s(<option value="value">value</option>) <>
                  ~s(<option selected value="novalue">novalue</option>)
 
-      assert options_for_select(~w(value novalue), "novalue") |> safe_to_string() ==
+      assert options_for_select(["value", :hr, "novalue"], "novalue") |> safe_to_string() ==
                ~s(<option value="value">value</option>) <>
+                 ~s(<hr/>) <>
                  ~s(<option selected value="novalue">novalue</option>)
 
       assert options_for_select(
                [
                  [value: "value", key: "Value", disabled: true],
+                 :hr,
                  [value: "novalue", key: "No Value"]
                ],
                "novalue"
              )
              |> safe_to_string() ==
                ~s(<option disabled value="value">Value</option>) <>
+                 ~s(<hr/>) <>
                  ~s(<option selected value="novalue">No Value</option>)
 
       assert options_for_select(~w(value novalue), ["value", "novalue"]) |> safe_to_string() ==
                ~s(<option selected value="value">value</option>) <>
                  ~s(<option selected value="novalue">novalue</option>)
+
+      assert options_for_select([Label: "value", hr: nil, New: "new"], nil) |> safe_to_string() ==
+               ~s(<option value="value">Label</option>) <>
+                 ~s(<hr/>) <>
+                 ~s(<option value="new">New</option>)
     end
 
     test "with groups" do
-      assert options_for_select([{"foo", ~w(bar baz)}, {"qux", ~w(qux quz)}], "qux")
+      assert options_for_select([{"foo", ["bar", :hr, "baz"]}, {"qux", ~w(qux quz)}], "qux")
              |> safe_to_string() ==
                ~s(<optgroup label="foo">) <>
                  ~s(<option value="bar">bar</option>) <>
+                 ~s(<hr/>) <>
                  ~s(<option value="baz">baz</option>) <>
                  ~s(</optgroup>) <>
                  ~s(<optgroup label="qux">) <>