added easymotion

sources_non_forked/vim-easymotion/autoload/EasyMotion/undo.vim

@@ -0,0 +1,50 @@
+let s:Buffer = vital#easymotion#import('Vim.Buffer')
+
+function! EasyMotion#undo#save() abort
+  return s:undo_lock.save()
+endfunction
+
+let s:undo_lock = {}
+
+function! s:undo_lock.save() abort
+  let undo = deepcopy(self)
+  call undo._save()
+  return undo
+endfunction
+
+function! s:undo_lock._save() abort
+  if undotree().seq_last == 0
+    " if there are no undo history, disable undo feature by setting
+    " 'undolevels' to -1 and restore it.
+    let self.save_undolevels = &l:undolevels
+    let &l:undolevels = -1
+  elseif !s:Buffer.is_cmdwin()
+    " command line window doesn't support :wundo.
+    let self.undofile = tempname()
+    execute 'wundo!' self.undofile
+  else
+    let self.is_cmdwin = s:TRUE
+  endif
+endfunction
+
+function! s:undo_lock.restore() abort
+  if has_key(self, 'save_undolevels')
+    let &l:undolevels = self.save_undolevels
+  endif
+  if has_key(self, 'undofile') && filereadable(self.undofile)
+    silent execute 'rundo' self.undofile
+    call delete(self.undofile)
+  endif
+  if has_key(self, 'is_cmdwin')
+    " XXX: it breaks undo history. AFAIK, there are no way to save and restore
+    " undo history in commandline window.
+    call self.undobreak()
+  endif
+endfunction
+
+function! s:undo_lock.undobreak() abort
+  let old_undolevels = &l:undolevels
+  setlocal undolevels=-1
+  keepjumps call setline('.', getline('.'))
+  let &l:undolevels = old_undolevels
+endfunction