fix: allow normal list elements in class attr

This allows you to include strings in class lists instead of only
allowing keyword lists.

So `["foo", "bar", nil, "baz": true]` will result in `"foo bar baz"` now

Fixes #238

lib/temple/ast/utils.ex

@@ -81,7 +81,15 @@ defmodule Temple.Ast.Utils do
   def build_attr("class", classes) when is_list(classes) do
     value =
       quote do
-        String.trim_leading(for {class, true} <- unquote(classes), into: "", do: " #{class}")
+        String.trim_leading(
+          for value <- unquote(classes), into: "" do
+            case value do
+              {class, true} -> " #{class}"
+              class when is_binary(class) -> " #{class}"
+              _ -> ""
+            end
+          end
+        )
       end
 
     [{:text, ~s' class="'}, {:expr, value}, {:text, ~s'"'}]

test/temple/ast/utils_test.exs

@@ -30,33 +30,6 @@ defmodule Temple.Ast.UtilsTest do
              ) == Macro.to_string(actual)
     end
 
-    test "returns a list of text and expr nodes for the class object syntax" do
-      class_ast = quote(do: @class)
-
-      list =
-        quote do
-          ["text-red": unquote(class_ast)]
-        end
-
-      expr =
-        quote do
-          String.trim_leading(for {class, true} <- unquote(list), into: "", do: " #{class}")
-        end
-
-      attrs = [class: ["text-red": class_ast]]
-
-      actual = Utils.compile_attrs(attrs)
-
-      assert [
-               {:text, ~s' class="'},
-               {:expr, result_expr},
-               {:text, ~s'"'}
-             ] = actual
-
-      # the ast metadata is different, let's just compare stringified versions
-      assert Macro.to_string(result_expr) == Macro.to_string(expr)
-    end
-
     test "the rest! attribute will mix in the values at runtime" do
       rest_ast =
         quote do

test/temple/renderer_test.exs

@@ -485,20 +485,28 @@ defmodule Temple.RendererTest do
   end
 
   describe "special attribute stuff" do
-    test "class object syntax" do
+    test "class list " do
       result =
         Renderer.compile do
-          div class: ["hello world": false, "text-red": true] do
+          div class: ["foo bar", "hello world": false, "text-red": true] do
             "hello world"
           end
+
+          div class: ["foo", nil, "bar"] do
+            "hi"
+          end
         end
 
       # html
       expected = """
-      <div class="text-red">
+      <div class="foo bar text-red">
         hello world
       </div>
 
+      <div class="foo bar">
+        hi
+      </div>
+
       """
 
       assert_html expected, result