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function! prettier#utils#buffer#replace(lines, startSelection, endSelection) abort
" store view
let l:winview = winsaveview()
let l:newBuffer = prettier#utils#buffer#createBufferFromUpdatedLines(a:lines, a:startSelection, a:endSelection)
" we should not replace contents if the newBuffer is empty
if empty(l:newBuffer)
return
endif
" delete all lines on the current buffer
silent! execute '%delete _'
" replace all lines from the current buffer with output from prettier
let l:idx = 0
for l:line in l:newBuffer
silent! call append(l:idx, l:line)
let l:idx += 1
endfor
" delete trailing newline introduced by the above append procedure
silent! execute '$delete _'
" Restore view
call winrestview(l:winview)
endfunction
" Replace and save the buffer
function! prettier#utils#buffer#replaceAndSave(lines, startSelection, endSelection) abort
call prettier#utils#buffer#replace(a:lines, a:startSelection, a:endSelection)
write
endfunction
" Returns 1 if content has changed
function! prettier#utils#buffer#willUpdatedLinesChangeBuffer(lines, start, end) abort
return getbufline(bufnr('%'), 1, line('$')) == prettier#utils#buffer#createBufferFromUpdatedLines(a:lines, a:start, a:end) ? 0 : 1
endfunction
" Returns a new buffer with lines replacing start and end of the contents of the current buffer
function! prettier#utils#buffer#createBufferFromUpdatedLines(lines, start, end) abort
return getbufline(bufnr('%'), 1, a:start - 1) + a:lines + getbufline(bufnr('%'), a:end + 1, '$')
endfunction
" Adapted from https://github.com/farazdagi/vim-go-ide
function! s:getCharPosition(line, col) abort
if &encoding !=# 'utf-8'
" On utf-8 enconding we can't just use bytes so we need to make sure we can count the
" characters, we do that by adding the text into a temporary buffer and counting the chars
let l:buf = a:line == 1 ? '' : (join(getline(1, a:line - 1), "\n") . "\n")
let l:buf .= a:col == 1 ? '' : getline('.')[:a:col - 2]
return len(iconv(l:buf, &encoding, 'utf-8'))
endif
" On non utf-8 the line byte should match the character
return line2byte(a:line) + (a:col - 2)
endfun
" Returns [start, end] byte range when on visual mode
function! prettier#utils#buffer#getCharRange(startSelection, endSelection) abort
let l:range = []
call add(l:range, s:getCharPosition(a:startSelection, col("'<")))
call add(l:range, s:getCharPosition(a:endSelection, col("'>")))
return l:range
endfunction
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