How to open folds in a pedit-preview popup window?

Question

I'm displaying a file contents by using :pedit …the-file-path…, to then call popup_setoptions(…the-ID…,#{firstline:anumber}) in order to scroll the popup and highlight/show the desired part of the file.

There's however one problem — the folds are closed by default and thus they hide the file contents… How to open them?

What I've tried is a exe ':'.pupid.'windo norm! zi' however the command fails upfront with and 'Invalid range` error. The pupid is being obtained via popup_findpreview() and is correct.

Answer 1

What I've tried is a exe ':'.pupid.'windo norm! zi' however the command fails upfront with and 'Invalid range` error. The pupid is being obtained via popup_findpreview() and is correct.

That's because popup_findpreview() gives you a window ID, but the range passed to :windo expects window numbers:

:[range]windo {cmd} Execute {cmd} in each window or if [range] is given only in windows for which the window number lies in the [range]. It works like doing this: >

Try to use win_execute() instead of :windo:

call win_execute(pupid, 'norm! zi')

The latter is better anyway, because it has fewer side-effects.

Answer 2

If you look at the help for the :pedit command, you will see this:

                                                    :ped :pedit
:ped[it][!] [++opt] [+cmd] {file}
            Edit {file} in the preview window.  The preview window is
            opened like with :ptag.  The current window and cursor
            position isn't changed.  Useful example: 
                    :pedit +/fputc /usr/include/stdio.h

Note that you can use the +cmd command to execute an additional command when opening the preview window. In your case, you can open the file and disallowing folding by using this command then:

:pedit +setl\ nofoldenable <file>

Not, that you need to escape the whitespace between the :setl and the actual option value. You can probably also add an additional command to scroll to the required line, e.g. something like this:

:pedit +setl\ nofoldenable|44 <file>

To open <file>, disable folding in that window and jump to line 44.