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" Autoloaded entry point function
function! paste_insert#() abort
" Set up an event table
augroup paste_insert
autocmd!
" Set up the paste and tell the user
autocmd User Start
\ call s:Start() | echo 'Paste ready'
" When starting insert mode, add completion hook for when we leave
autocmd InsertEnter *
\ autocmd paste_insert InsertLeave *
\ doautocmd paste_insert User Complete
" User waits too long in normal mode, timeout
autocmd CursorHold *
\ doautocmd paste_insert User Timeout
" User leaves the buffer or window, abort
autocmd BufLeave,WinLeave *
\ doautocmd paste_insert User Abort
" Exit condition reporting
autocmd User Abort
\ echo 'Paste aborted'
autocmd User Cancel
\ echo 'Paste cancelled'
autocmd User Complete
\ echo 'Paste completed'
autocmd User Timeout
\ echo 'Paste timeout'
" End the paste and clear the events table
autocmd User Abort,Cancel,Complete,Timeout
\ call s:Stop() | autocmd! paste_insert
augroup END
" Trigger the starting actions
doautocmd paste_insert User Start
endfunction
" Keys that cancel the pending paste in normal mode, defaults to Ctrl-C and
" Escape
let s:cancel = get(g:, 'paste_insert_cancel', ['<C-C>', '<Esc>'])
" Cache for the prior functions of those keys, in case the user has already
" mapped them
let s:maparg = {}
" Start the paste: save each cancel key's prior function, remap it, set
" 'paste'
function! s:Start() abort
for key in s:cancel
let s:maparg[key] = maparg(key, 'n')
let command = join([
\ 'nnoremap'
\,key
\,':<C-U>doautocmd paste_insert User Cancel<CR>'
\])
execute command
endfor
set paste
endfunction
" Stop the paste: unset 'paste', restore prior function of cancel key
function! s:Stop() abort
set nopaste
for key in s:cancel
let command = join(
\ s:maparg[key] !=# ''
\ ? ['nnoremap', key, s:maparg[key]]
\ : ['nunmap', key]
\)
execute command
unlet s:maparg[key]
endfor
endfunction
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