Elide long include path proposals

src/command_line.cc

@@ -1821,6 +1821,7 @@ bool QueryDbMainLoop(
             }
           }
 
+          std::cerr << "[complete] Returning " << complete_response.result.items.size() << " include completions" << std::endl;
           ipc->SendOutMessageToClient(IpcId::TextDocumentCompletion, complete_response);
         }
         else {

src/config.h

@@ -29,6 +29,10 @@ struct Config {
   // If true, document links are reported for #include directives.
   bool showDocumentLinksOnIncludes = true;
 
+  // Maximum path length to show in completion results. Paths longer than this
+  // will be elided with ".." put at the front. Set to 0 or a negative number
+  // to disable eliding.
+  int includeCompletionMaximumPathLength = 30;
   // Whitelist that file paths will be tested against. If a file path does not
   // end in one of these values, it will not be considered for auto-completion.
   // An example value is { ".h", ".hpp" }
@@ -57,6 +61,7 @@ MAKE_REFLECT_STRUCT(Config,
   indexerCount,
   enableIndexing, enableCacheWrite, enableCacheRead,
 
+  includeCompletionMaximumPathLength,
   includeCompletionWhitelistLiteralEnding,
   includeCompletionWhitelist, includeCompletionBlacklist,
 

src/include_completion.cc

@@ -10,6 +10,17 @@
 
 namespace {
 
+std::string ElideLongPath(Config* config, const std::string& path) {
+  if (config->includeCompletionMaximumPathLength <= 0)
+    return path;
+
+  if (path.size() <= config->includeCompletionMaximumPathLength)
+    return path;
+
+  int start = path.size() - config->includeCompletionMaximumPathLength;
+  return ".." + path.substr(start + 2);
+}
+
 size_t TrimCommonPathPrefix(const std::string& result, const std::string& trimmer) {
   size_t i = 0;
   while (i < result.size() && i < trimmer.size()) {
@@ -56,12 +67,22 @@ bool TrimPath(Project* project, const std::string& project_root, std::string& in
   return angle;
 }
 
-lsCompletionItem BuildCompletionItem(std::string path, bool use_angle_brackets, bool is_stl) {
+lsCompletionItem BuildCompletionItem(Config* config, std::string path, bool use_angle_brackets, bool is_stl) {
   lsCompletionItem item;
   if (use_angle_brackets)
-    item.label = "#include <" + std::string(path) + ">";
+    item.label = "#include <" + ElideLongPath(config, path) + ">";
   else
-    item.label = "#include \"" + std::string(path) + "\"";
+    item.label = "#include \"" + ElideLongPath(config, path) + "\"";
+
+  item.detail = path;
+
+  // Replace the entire existing content.
+  // NOTE: When submitting completion items, textEdit->range must be updated.
+  item.textEdit = lsTextEdit();
+  if (use_angle_brackets)
+    item.textEdit->newText = "#include <" + path + ">";
+  else
+    item.textEdit->newText = "#include \"" + path + "\"";
 
   item.insertTextFormat = lsInsertTextFormat::PlainText;
   if (is_stl)
@@ -69,11 +90,6 @@ lsCompletionItem BuildCompletionItem(std::string path, bool use_angle_brackets,
   else
     item.kind = lsCompletionItemKind::File;
 
-  // Replace the entire existing content.
-  // NOTE: When submitting completion items, textEdit->range must be updated.
-  item.textEdit = lsTextEdit();
-  item.textEdit->newText = item.label;
-
   return item;
 }
 
@@ -115,7 +131,7 @@ void IncludeCompletion::AddFile(std::string path) {
     return;
 
   bool use_angle_brackets = TrimPath(project_, config_->projectRoot, path);
-  lsCompletionItem item = BuildCompletionItem(path, use_angle_brackets, false /*is_stl*/);
+  lsCompletionItem item = BuildCompletionItem(config_, path, use_angle_brackets, false /*is_stl*/);
   
   if (is_scanning) {
     std::lock_guard<std::mutex> lock(completion_items_mutex);
@@ -136,7 +152,7 @@ void IncludeCompletion::InsertIncludesFromDirectory(
     if (match_ && !match_->IsMatch(directory + path))
       return;
 
-    result.push_back(BuildCompletionItem(path, use_angle_brackets, false /*is_stl*/));
+    result.push_back(BuildCompletionItem(config_, path, use_angle_brackets, false /*is_stl*/));
   });
 
   std::lock_guard<std::mutex> lock(completion_items_mutex);
@@ -146,6 +162,6 @@ void IncludeCompletion::InsertIncludesFromDirectory(
 void IncludeCompletion::InsertStlIncludes() {
   std::lock_guard<std::mutex> lock(completion_items_mutex);
   for (const char* stl_header : kStandardLibraryIncludes) {
-    completion_items.insert(BuildCompletionItem(stl_header, true /*use_angle_brackets*/, true /*is_stl*/));
+    completion_items.insert(BuildCompletionItem(config_, stl_header, true /*use_angle_brackets*/, true /*is_stl*/));
   }
 }

src/language_server_api.h

@@ -461,7 +461,13 @@ struct lsCompletionItem {
   // a completion and a completion resolve request.
   // data ? : any
 
-  inline bool operator==(const lsCompletionItem& other) const { return label == other.label; }
+  inline bool operator==(const lsCompletionItem& other) const {
+    if (textEdit && other.textEdit)
+      return textEdit->newText == other.textEdit->newText;
+    if (!insertText.empty())
+      return insertText == other.insertText;
+    return label == other.label;
+  }
 };
 MAKE_REFLECT_STRUCT(lsCompletionItem,
   label,
@@ -472,7 +478,17 @@ MAKE_REFLECT_STRUCT(lsCompletionItem,
   insertText,
   insertTextFormat,
   textEdit);
-MAKE_HASHABLE(lsCompletionItem, t.label);
+namespace std {
+template<> struct hash<lsCompletionItem> {
+  std::size_t operator()(const lsCompletionItem& t) const {
+    if (t.textEdit)
+      return std::hash<std::string>()(t.textEdit->newText);
+    if (!t.insertText.empty())
+      return std::hash<std::string>()(t.insertText);
+    return std::hash<std::string>()(t.label);
+  }
+};
+}
 
 struct lsTextDocumentItem {
   // The text document's URI.