From 03df4085fb721e8c5e44e93abb168633241bac89 Mon Sep 17 00:00:00 2001
From: Fangrui Song <i@maskray.me>
Date: Fri, 22 Feb 2019 23:49:37 +0800
Subject: [PATCH] Make hover more detailed (e.g. include inheritance info)

---
 src/indexer.cc                     |  4 +++-
 src/messages/textDocument_hover.cc | 38 +++++++++++++++---------------
 2 files changed, 22 insertions(+), 20 deletions(-)

diff --git a/src/indexer.cc b/src/indexer.cc
index 894286f3..b6653fc3 100644
--- a/src/indexer.cc
+++ b/src/indexer.cc
@@ -815,10 +815,12 @@ public:
       do_def_decl(type);
       if (Spell != Loc)
         AddMacroUse(db, SM, usr, Kind::Type, Spell);
-      if (type->def.detailed_name[0] == '\0' && info->short_name.size()) {
+      if ((is_def || type->def.detailed_name[0] == '\0') &&
+          info->short_name.size()) {
         if (D->getKind() == Decl::TemplateTypeParm)
           type->def.detailed_name = Intern(info->short_name);
         else
+          // OrigD may be detailed, e.g. "struct D : B {}"
           SetName(OrigD, info->short_name, info->qualified, type->def);
       }
       if (is_def || is_decl) {
diff --git a/src/messages/textDocument_hover.cc b/src/messages/textDocument_hover.cc
index 50cbf620..60c00fb9 100644
--- a/src/messages/textDocument_hover.cc
+++ b/src/messages/textDocument_hover.cc
@@ -47,33 +47,33 @@ GetHover(DB *db, LanguageId lang, SymbolRef sym, int file_id) {
   const char *comments = nullptr;
   std::optional<MarkedString> ls_comments, hover;
   WithEntity(db, sym, [&](const auto &entity) {
-    std::remove_reference_t<decltype(entity.def[0])> *def = nullptr;
     for (auto &d : entity.def) {
       if (d.spell) {
         comments = d.comments[0] ? d.comments : nullptr;
-        def = &d;
+        if (const char *s =
+                d.hover[0] ? d.hover
+                           : d.detailed_name[0] ? d.detailed_name : nullptr) {
+          if (!hover)
+            hover = {LanguageIdentifier(lang), s};
+          else if (strlen(s) > hover->value.size())
+            hover->value = s;
+        }
         if (d.spell->file_id == file_id)
           break;
       }
     }
-    if (!def && entity.def.size()) {
-      def = &entity.def[0];
-      if (def->comments[0])
-        comments = def->comments;
-    }
-    if (def) {
-      MarkedString m;
-      m.language = LanguageIdentifier(lang);
-      if (def->hover[0]) {
-        m.value = def->hover;
-        hover = m;
-      } else if (def->detailed_name[0]) {
-        m.value = def->detailed_name;
-        hover = m;
-      }
-      if (comments)
-        ls_comments = MarkedString{std::nullopt, comments};
+    if (!hover && entity.def.size()) {
+      auto &d = entity.def[0];
+      if (d.comments[0])
+        comments = d.comments;
+      hover = {LanguageIdentifier(lang)};
+      if (d.hover[0])
+        hover->value = d.hover;
+      else if (d.detailed_name[0])
+        hover->value = d.detailed_name;
     }
+    if (comments)
+      ls_comments = MarkedString{std::nullopt, comments};
   });
   return {hover, ls_comments};
 }