From a6bd86a8550d5d7e8bdb12e1d09036b9f88eed73 Mon Sep 17 00:00:00 2001
From: Łukasz Hanuszczak <lukasz.hanuszczak@gmail.com>
Date: Mon, 22 Jun 2015 17:41:31 +0200
Subject: Add support for fancy highlighting upon hovering over identifier.

---
 haddock-api/src/Haddock/Backends/Hyperlinker.hs    | 10 ++++++++--
 .../src/Haddock/Backends/Hyperlinker/Renderer.hs   | 23 ++++++++++++++--------
 2 files changed, 23 insertions(+), 10 deletions(-)

(limited to 'haddock-api/src/Haddock')

diff --git a/haddock-api/src/Haddock/Backends/Hyperlinker.hs b/haddock-api/src/Haddock/Backends/Hyperlinker.hs
index 66392a67..9337307c 100644
--- a/haddock-api/src/Haddock/Backends/Hyperlinker.hs
+++ b/haddock-api/src/Haddock/Backends/Hyperlinker.hs
@@ -16,14 +16,17 @@ ppHyperlinkedSource outdir libdir mstyle ifaces = do
     createDirectoryIfMissing True $ srcPath outdir
     let cssFile = fromMaybe (defaultCssFile libdir) mstyle
     copyFile cssFile $ srcPath outdir </> srcCssFile
+    copyFile (libdir </> "html" </> highlightScript) $
+        srcPath outdir </> highlightScript
     mapM_ (ppHyperlinkedModuleSource outdir) ifaces
 
 ppHyperlinkedModuleSource :: FilePath -> Interface -> IO ()
 ppHyperlinkedModuleSource outdir iface = case ifaceTokenizedSrc iface of
-    Just tokens -> writeFile path $ showHtml . render mSrcCssFile $ tokens
+    Just tokens -> writeFile path $ showHtml . render mCssFile mJsFile $ tokens
     Nothing -> return ()
   where
-    mSrcCssFile = Just $ srcCssFile
+    mCssFile = Just $ srcCssFile
+    mJsFile = Just $ highlightScript
     path = srcPath outdir </> moduleSourceFile (ifaceMod iface)
 
 moduleSourceFile :: Module -> FilePath
@@ -35,5 +38,8 @@ srcPath outdir = outdir </> "src"
 srcCssFile :: FilePath
 srcCssFile = "style.css"
 
+highlightScript :: FilePath
+highlightScript = "highlight.js"
+
 defaultCssFile :: FilePath -> FilePath
 defaultCssFile libdir = libdir </> "html" </> "solarized.css"
diff --git a/haddock-api/src/Haddock/Backends/Hyperlinker/Renderer.hs b/haddock-api/src/Haddock/Backends/Hyperlinker/Renderer.hs
index 70524759..6d6d2012 100644
--- a/haddock-api/src/Haddock/Backends/Hyperlinker/Renderer.hs
+++ b/haddock-api/src/Haddock/Backends/Hyperlinker/Renderer.hs
@@ -16,21 +16,28 @@ import qualified Text.XHtml as Html
 
 type StyleClass = String
 
-render :: Maybe FilePath -> [RichToken] -> Html
-render css tokens = header css <> body tokens
+render :: Maybe FilePath -> Maybe FilePath -> [RichToken] -> Html
+render mcss mjs tokens = header mcss mjs <> body tokens
 
 body :: [RichToken] -> Html
 body = Html.body . Html.pre . mconcat . map richToken
 
-header :: Maybe FilePath -> Html
-header Nothing = Html.noHtml
-header (Just css) =
-    Html.header $ Html.thelink Html.noHtml ! attrs
+header :: Maybe FilePath -> Maybe FilePath -> Html
+header mcss mjs
+    | isNothing mcss && isNothing mjs = Html.noHtml
+header mcss mjs =
+    Html.header $ css mcss <> js mjs
   where
-    attrs =
+    css Nothing = Html.noHtml
+    css (Just cssFile) = Html.thelink Html.noHtml !
         [ Html.rel "stylesheet"
-        , Html.href css
         , Html.thetype "text/css"
+        , Html.href cssFile
+        ]
+    js Nothing = Html.noHtml
+    js (Just jsFile) = Html.script Html.noHtml !
+        [ Html.thetype "text/javascript"
+        , Html.src jsFile
         ]
 
 richToken :: RichToken -> Html
-- 
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