Fix project search and status view for new add directory feature

data/core/init.lua

@@ -155,12 +155,22 @@ local function project_files_iter(state)
   return dir.name, dir.files[state.file_index]
 end
 
-function core.project_files()
+
+function core.get_project_files()
   local state = { dir_index = 1, file_index = 0 }
   return project_files_iter, state
 end
 
 
+function core.project_files_number()
+  local n = 0
+  for i = 1, #core.project_directories do
+    n = n + #core.project_directories[i].files
+  end
+  return n
+end
+
+
 -- create a directory using mkdir but may need to create the parent
 -- directories as well.
 local function create_user_directory()