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knupska avatar knupska commented on July 24, 2024

I also wanted this behaviour and was able to cobble this together:

if !exists("b:fern_is_preview")
  let b:fern_is_preview = 0
endif
function! FernPreviewToggle()
  if b:fern_is_preview
    :execute "normal \<Plug>(fern-action-preview:close)"
    :execute "normal \<Plug>(fern-action-preview:auto:disable)"
    nunmap <buffer> <C-d>
    nunmap <buffer> <C-u>
    let b:fern_is_preview = 0
  else
    :execute "normal \<Plug>(fern-action-preview:open)"
    :execute "normal \<Plug>(fern-action-preview:auto:enable)<Plug>(fern-action-preview:open)"
    nmap <silent> <buffer> <C-d> <Plug>(fern-action-preview:scroll:down:half)
    nmap <silent> <buffer> <C-u> <Plug>(fern-action-preview:scroll:up:half)
    let b:fern_is_preview = 1
  endif
endfunction

nmap <silent> <buffer> p :call FernPreviewToggle()<CR>

It should be placed within the init_fern() function as outlined here, so that it acts upon the buffer that fern is in.

It will only work so long as the preview is open/closed via the function.

from fern-preview.vim.

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