Showing preview window data for completions

Also, const functions have " const" correctly appended in the completion window.

cpp/ycm/ClangUtils.cpp

@@ -96,6 +96,7 @@ bool IsMainCompletionTextInfo( CXCompletionChunkKind kind )
     kind == CXCompletionChunk_Colon        ||
     kind == CXCompletionChunk_SemiColon    ||
     kind == CXCompletionChunk_Equal        ||
+    kind == CXCompletionChunk_Informative  ||
     kind == CXCompletionChunk_HorizontalSpace;
 
 }
@@ -204,9 +205,6 @@ CompletionData CompletionResultToCompletionData(
 
     if ( kind == CXCompletionChunk_TypedText )
       data.original_string_ = ChunkToString( completion_string, j );
-
-    if ( kind == CXCompletionChunk_Informative )
-      data.detailed_info_ = ChunkToString( completion_string, j );
   }
 
   data.kind_ = CursorKindToVimKind( completion_result.CursorKind );
@@ -243,11 +241,16 @@ std::vector< CompletionData > ToCompletionDataVector(
 
     else
     {
+      std::string possible_newline =
+        completions[ index ].detailed_info_.empty() ?
+        "" :
+        "\n";
+
       // If we have already seen this completion, then this is an overload of a
       // function we have seen. We add the signature of the overload to the
       // detailed information.
       completions[ index ].detailed_info_
-        .append( "\n" )
+        .append( possible_newline )
         .append( data.return_type_ )
         .append( " " )
         .append( data.everything_except_return_type_ );

cpp/ycm/ycm_core.cpp

@@ -40,7 +40,7 @@ BOOST_PYTHON_MODULE(ycm_core)
     .def( "TextToInsertInBuffer", &CompletionData::TextToInsertInBuffer )
     .def( "MainCompletionText", &CompletionData::MainCompletionText )
     .def( "ExtraMenuInfo", &CompletionData::ExtraMenuInfo )
-    .def( "DetailedInfoForPreviewWindow ",
+    .def( "DetailedInfoForPreviewWindow",
           &CompletionData::DetailedInfoForPreviewWindow )
     .def_readonly( "kind_", &CompletionData::kind_ );
 

python/completers/cpp/clang_completer.py

@@ -146,14 +146,15 @@ def CompletionDataToDict( completion_data ):
     'abbr' : completion_data.MainCompletionText(),
     'menu' : completion_data.ExtraMenuInfo(),
     'kind' : completion_data.kind_,
+    'info' : completion_data.DetailedInfoForPreviewWindow(),
     'dup'  : 1,
-    # TODO: add detailed_info_ as 'info'
   }
 
 
 def DiagnosticToDict( diagnostic ):
   # see :h getqflist for a description of the dictionary fields
   return {
+    # TODO: wrap the bufnr generation into a function
     'bufnr' : int( vim.eval( "bufnr('{0}', 1)".format(
       diagnostic.filename_ ) ) ),
     'lnum'  : diagnostic.line_number_,