How to search/replace while including or excluding folded text?

Question

Is there any way to run a command like:

:%s/tempdir/temp_dir/g

But apply it only to either folded or unfolded code?

Answer 1

:folddoopen and :folddoclose do exactly what you want:

:folddoopen s/tempdir/temp_dir/g
:folddoclosed s/tempdir/temp_dir/g

Reference:

:help folding
:help :folddoopen
:help :folddoclosed