highlight: guess by text when path name is ambiguous Although the docs claim that guess_lexer_for_filename will fall back to using file data, my ubuntu 7.10 pygments library seems to ignore the text argument. So call guess_lexer explicitly on failure.

% should fail
abort: path contains illegal component: .hg/00changelog.i
adding a/a
% should fail
abort: path 'b/b' traverses symbolic link 'b'
% should succeed
% should still fail - maybe
abort: path 'b/b' traverses symbolic link 'b'