How can I open all folds but the last one?

Question

I would like to open all folds in a buffer recursively apart from folds which contain just text and no further folds.

I know that zO opens all folds in a buffer but as explained this is different from what I would like to achieve. Furthermore it will also not help to set a specific fold level because the depth in the fold hierarchy is very different.

Is there a way to achieve what I want?

Answer 1

Try this:

zM
:folddoclosed if foldlevel('.') < foldlevel(line('.')+1) | exe 'norm! zo' | endif

Close all folds. Then, iterating over all lines in closed folds, check if the subsequent line has a greater foldlevel. If so, unfold the current line.