refactor(users/Profpatsch/whatcd-resolver): move AppT & Html out

These functions are just general setup and html helpers, the main file
is getting a bit long otherwise.

Change-Id: I194e9f7f4caa4ce204d510c885dcf5af63d0e76e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11165
Autosubmit: Profpatsch <mail@profpatsch.de>
Reviewed-by: Profpatsch <mail@profpatsch.de>
Tested-by: BuildkiteCI

users/Profpatsch/whatcd-resolver/src/Html.hs

@@ -0,0 +1,69 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Html where
+
+import Data.Aeson qualified as Json
+import Data.Aeson.KeyMap qualified as KeyMap
+import Data.List.NonEmpty qualified as NonEmpty
+import Data.Map.Strict qualified as Map
+import IHP.HSX.QQ (hsx)
+import PossehlAnalyticsPrelude
+import Text.Blaze.Html (Html)
+import Text.Blaze.Html5 qualified as Html
+import Prelude hiding (span)
+
+-- | Render an arbitrary json value to HTML in a more-or-less reasonable fashion.
+mkVal :: Json.Value -> Html
+mkVal = \case
+  Json.Number n -> Html.toHtml @Text $ showToText n
+  Json.String s -> Html.toHtml @Text s
+  Json.Bool True -> [hsx|<em>true</em>|]
+  Json.Bool False -> [hsx|<em>false</em>|]
+  Json.Null -> [hsx|<em>null</em>|]
+  Json.Array arr -> toOrderedList mkVal arr
+  Json.Object obj ->
+    obj
+      & KeyMap.toMapText
+      & toDefinitionList (Html.toHtml @Text) mkVal
+
+toOrderedList :: (Foldable t1) => (t2 -> Html) -> t1 t2 -> Html
+toOrderedList mkValFn arr =
+  arr
+    & foldMap (\el -> Html.li $ mkValFn el)
+    & Html.ol
+
+toUnorderedList :: (Foldable t1) => (t2 -> Html) -> t1 t2 -> Html
+toUnorderedList mkValFn arr =
+  arr
+    & foldMap (\el -> Html.li $ mkValFn el)
+    & Html.ul
+
+-- | Render a definition list from a Map
+toDefinitionList :: (Text -> Html) -> (t -> Html) -> Map Text t -> Html
+toDefinitionList mkKeyFn mkValFn obj =
+  obj
+    & Map.toList
+    & foldMap (\(k, v) -> Html.dt (mkKeyFn k) <> Html.dd (mkValFn v))
+    & Html.dl
+
+-- | Render a table-like structure of json values as an HTML table.
+toTable :: [[(Text, Json.Value)]] -> Html
+toTable xs =
+  case xs & nonEmpty of
+    Nothing ->
+      [hsx|<p>No results.</p>|]
+    Just xs' -> do
+      let headers = xs' & NonEmpty.head <&> fst <&> (\h -> [hsx|<th>{h}</th>|]) & mconcat
+      let vals = xs' & foldMap (Html.tr . foldMap (Html.td . mkVal . snd))
+      [hsx|
+              <table class="table">
+                <thead>
+                  <tr>
+                  {headers}
+                  </tr>
+                </thead>
+                <tbody>
+                  {vals}
+                </tbody>
+              </table>
+          |]