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"
" insert_cancel.vim: Cancel the current insert operation by undoing the last
" change upon insert exit, if we made a change; intended for remapping
" insert-mode Ctrl-C to do something useful.
"
" This was *way* harder to figure out than it looks.
"
" Author: Tom Ryder <tom@sanctum.geek.nz>
" License: Same as Vim itself
"
if exists('loaded_insert_cancel') || &compatible
finish
endif
if v:version < 700
finish
endif
let loaded_insert_cancel = 1
" Set up the hooks described for the functions above, if Vim is new enough to
" support all the hooks required
augroup insert_cancel
autocmd!
" On buffer edit and cursor move, cache the current change number
autocmd BufEnter,CursorMoved *
\ let b:insert_cancel_changenr = changenr()
" Function wrappers for entering and leaving insert mode
autocmd InsertEnter * call insert_cancel#Enter()
autocmd InsertLeave * call insert_cancel#Check()
augroup END
" Mapping that exits insert mode normally and checks for a change to undo
inoremap <silent> <Plug>(InsertCancel)
\ <Esc>:<C-U>call insert_cancel#Cancel()<CR>
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