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" Replace the operated text with the contents of a register
function! replace_operator#Operatorfunc(type) abort
" If we're using the unnamed register, we'll need to save its current
" contents, because the deletion we're about to do will overwrite it
let l:register = g:replace_operator#register
if l:register ==# '"'
let l:text = getreg(l:register)
endif
" Select or re-select text depending on how we were invoked
if a:type ==# 'v' || a:type ==# 'V'
normal! gv
elseif a:type ==# "\<C-V>"
echoerr 'Visual block mode replace not supported'
return
elseif a:type ==# 'line'
normal! '[V']
else
normal! `[v`]
endif
" Delete the text normally so it stacks up in the numbered registers, and
" then restore the active register's initial value if we just clobbered it
normal! d
if l:register ==# '"'
call setreg(l:register, l:text)
endif
" Are we working linewise or characterwise?
let l:linewise = a:type ==# 'V' || a:type ==# 'line'
" If the cursor is before the start of the last changed text, we've deleted
" to the end of line (characterwise) or the end of buffer (linewise) and
" have been forced to move back and up respectively. If this is the case,
" we'll need to paste after the current point, not before it.
if l:linewise && line('.') < line("'[")
\ || !l:linewise && col('.') < col("'[")
let l:paste = 'p'
else
let l:paste = 'P'
endif
" Run the paste
execute 'normal "'.l:register.l:paste
endfunction
" Helper function for normal mode map
function! replace_operator#MapNormal(register) abort
let g:replace_operator#register = a:register
set operatorfunc=replace_operator#Operatorfunc
endfunction
" Helper function for visual mode map
function! replace_operator#MapVisual(register, visualmode) abort
let g:replace_operator#register = a:register
call replace_operator#Operatorfunc(a:visualmode)
endfunction
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