Add error tooltips to snippets

scaladoc-js/common/src/code-snippets/CodeSnippets.scala

@@ -130,6 +130,8 @@ class CodeSnippets:
 
         scastie.Embedded(popup.querySelector("pre"), scastieConfig)
 
+        popup.querySelector("li.btn.run-button").asInstanceOf[html.Element].click()
+
         e.stopPropagation()
       )
 

scaladoc/resources/dotty_res/styles/theme/components/code-snippet.css

@@ -150,6 +150,40 @@
   width: unset !important;
 }
 
+.tooltip-container {
+  display: none;
+}
+.tooltip:hover .tooltip-container {
+  display: unset;
+}
+.tooltip:hover .tooltip-container::after {
+  content: attr(label);
+  padding: 4px 8px;
+  color: white;
+  background-color:black;
+  position: absolute;
+  z-index:10;
+  box-shadow:0 0 3px #444;
+  opacity: 0.8;
+}
+
+.snippet .buttons .tooltip::after {
+  top: 32px;
+}
+
+.snippet-error {
+  border-bottom: 2px dotted red;
+}
+.snippet-warn {
+  border-bottom: 2px dotted orange;
+}
+.snippet-info {
+  border-bottom: 2px dotted teal;
+}
+.snippet-debug {
+  border-bottom: 2px dotted pink;
+}
+
 .hljs-keyword {
   color: var(--code-method-highlighting-keyword);
 }

scaladoc/src/dotty/tools/scaladoc/tasty/comments/markdown/SnippetRenderer.scala

@@ -94,6 +94,11 @@ object SnippetRenderer:
         line.copy(content = begin + s"""<span class="hideable">$comment</span>""" + end)
       case _ => line
 
+  private def reindexLines(lines: Seq[SnippetLine]) =
+    lines.zipWithIndex.map {
+      case (line, newIdx) => line.copy(lineNo = newIdx)
+    }
+
   private def wrapCodeLines(codeLines: Seq[String]): Seq[SnippetLine] =
     val snippetLines = codeLines.zipWithIndex.map {
       case (content, idx) => SnippetLine(content.escapeReservedTokens, idx)
@@ -133,7 +138,7 @@ object SnippetRenderer:
   ).toString
 
   def renderSnippetWithMessages(snippetName: Option[String], codeLines: Seq[String], messages: Seq[SnippetCompilerMessage], success: Boolean): String =
-    val transformedLines = wrapCodeLines.andThen(addCompileMessages(messages)).apply(codeLines).map(_.toHTML)
+    val transformedLines = wrapCodeLines.andThen(addCompileMessages(messages)).andThen(reindexLines).apply(codeLines).map(_.toHTML)
     val codeHTML = s"""<code class="language-scala">${transformedLines.mkString("")}</code>"""
     val isRunnable = success
     val attrs = Seq(