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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.
"
" Author: Tom Ryder <tom@sanctum.geek.nz>
" License: Same as Vim itself
"
if exists('g:loaded_insert_cancel') || &compatible
finish
endif
if v:version < 600
finish
endif
let g:loaded_insert_cancel = 1
" Initialise s:changedtick so vint understands
let s:changedtick = 0
" Set up an appropriate hook to track b:changedtick before we hit InsertLeave
if has('autocmd')
augroup insert_cancel
autocmd!
" Ideal; only runs when the text actually changes
if v:version > 703 || v:version == 703 && has('patch867')
autocmd TextChanged * let s:changedtick = b:changedtick
" Workable but wasteful and not quite as correct; updates every move
elseif v:version >= 700
autocmd CursorMoved * let s:changedtick = b:changedtick
endif
augroup END
endif
" Try hard to figure out whether we made a change to undo, and undo it if so
function! s:InsertCancel()
if !&modified
return
endif
if s:changedtick > 0 && b:changedtick > s:changedtick
\ || line("'[") != line("']")
\ || col("'[") != col("']")
silent undo
endif
endfunction
" Provide plugin mapping
inoremap <silent> <Plug>InsertCancel
\ <Esc>:<C-U>call <SID>InsertCancel()<CR>
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