edit-entry-link.twig

{%- if  currentUser.admin
        or ( 
               ( entry.authorId == currentUser.id and currentUser.can('editEntries:'     ~ entry.section.id) )
            or ( entry.authorId != currentUser.id and currentUser.can('editPeerEntries:' ~ entry.section.id) )
            or (
                entry.section.type == 'Single' and
                    ( entry.authorId == currentUser.id and currentUser.can('editEntries:'         ~ entry.section.id) )
                or  ( entry.authorId != currentUser.id and currentUser.can('editPeerEntryDrafts:' ~ entry.section.id) )
                )
            )
-%}
    <a href="{{ entry.cpEditUrl }}">Edit</a>
{%- endif -%}