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Check if 'bufnr' is a fern buffer before replacing the buffer #516

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merged 1 commit into from
Dec 7, 2024
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Check if 'bufnr' is a fern buffer before replacing the buffer #516

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17 changes: 17 additions & 0 deletions autoload/fern/helper/async.vim
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Original file line number Diff line number Diff line change
Expand Up @@ -19,9 +19,11 @@ function! s:async_redraw() abort dict
let fern = helper.fern
return s:Promise.resolve()
\.then({ -> fern.renderer.render(fern.visible_nodes) })
\.then({ v -> s:reject_on_non_fern_buffer(helper.bufnr, v) })
\.then({ v -> fern#internal#buffer#replace(helper.bufnr, v) })
\.then({ -> helper.async.remark() })
\.then({ -> fern#hook#emit('viewer:redraw', helper) })
\.catch({ e -> s:is_non_fern_buffer_rejection(e) ? 0 : s:Promise.reject(e) })
\.finally({ -> Profile() })
endfunction
let s:async.redraw = funcref('s:async_redraw')
Expand Down Expand Up @@ -347,3 +349,18 @@ function! s:enter(fern, node) abort
return s:Promise.reject(v:exception)
endtry
endfunction

" Check if the 'bufnr' is a fern buffer
" This check is required because the 'bufnr' may be a buffer that is not a
" fern buffer caused by 'enew' command prior to the initial rendering.
" See https://github.com/lambdalisue/fern.vim/issues/514 for detail.
function! s:reject_on_non_fern_buffer(bufnr, value) abort
if bufname(a:bufnr) !~# 'fern://'
return s:Promise.reject('reject because the buffer is not a fern buffer')
endif
return s:Promise.resolve(a:value)
endfunction

function! s:is_non_fern_buffer_rejection(message) abort
return a:message ==# 'reject because the buffer is not a fern buffer'
endfunction
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