vim-exchange/plugin/exchange.vim

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function! s:exchange_set(type, ...)
let sel_save = &selection
let &selection = "inclusive"
let reg_save = @@
if !exists('b:exchange_text')
if a:0
call s:store_pos(a:type, "'<", "'>")
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silent exe "normal! `<" . a:type . "`>y"
elseif a:type == 'line'
call s:store_pos('V', "'[", "']")
silent exe "normal! '[V']y"
elseif a:type == 'block'
call s:store_pos('\<C-V>', "'[", "']")
silent exe "normal! `[\<C-V>`]y"
else
call s:store_pos('v', "'[", "']")
silent exe "normal! `[v`]y"
endif
let b:exchange_text = @@
else
let @@ = b:exchange_text
if a:0
silent exe "normal! `<" . a:type . "`>y"
elseif a:type == 'line'
silent exe "normal! '[V']y"
elseif a:type == 'block'
silent exe "normal! `[\<C-V>`]y"
else
silent exe "normal! `[v`]y"
endif
let exchange_text = @@
let @@ = b:exchange_text
silent exe "normal! gvp"
let @@ = exchange_text
call s:exchange()
call s:exchange_clear()
endif
let &selection = sel_save
let @@ = reg_save
endfunction
function! s:exchange()
let x = getpos("'x")
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let a = getpos("'a")
let b = getpos("'b")
call setpos("'a", b:exchange_start)
call setpos("'b", b:exchange_end)
silent exe "normal! mx`a" . b:exchange_mode . "`bp`x"
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call setpos("'a", a)
call setpos("'b", b)
call setpos("'x", x)
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endfunction
function! s:store_pos(mode, start, end)
let b:exchange_mode = a:mode
let b:exchange_start = getpos(a:start)
let b:exchange_end = getpos(a:end)
endfunction
function! s:exchange_clear()
unlet! b:exchange_mode
unlet! b:exchange_start
unlet! b:exchange_end
unlet! b:exchange_text
endfunction
nnoremap <silent> <Plug>Exchange :<C-u>set opfunc=<SID>exchange_set<CR>g@
vnoremap <silent> <Plug>Exchange :<C-u>call <SID>exchange_set(visualmode(), 1)<CR>
nnoremap <silent> <Plug>ExchangeClear :<C-u>call <SID>exchange_clear()<CR>
nmap cx <Plug>Exchange
vmap cx <Plug>Exchange
nmap cxc <Plug>ExchangeClear