I broke up with neovim....vim is my best friend now

dot_vim/plugged/vim-vsnip-integ/autoload/vsnip_integ/integration/asyncomplete.vim

@@ -0,0 +1,55 @@
+function! vsnip_integ#integration#asyncomplete#attach() abort
+  call asyncomplete#register_source(
+  \   s:get_source_option({
+  \     'name': 'vsnip',
+  \     'whitelist': ['*'],
+  \     'completor': function('s:completor'),
+  \   })
+  \ )
+endfunction
+
+"
+" get_source_option
+"
+function! s:get_source_option(opts) abort
+  let l:defaults = {
+  \   'name': 'vsnip',
+  \   'completor': function('s:completor'),
+  \   'whitelist': ['*']
+  \ }
+  return extend(l:defaults, a:opts)
+endfunction
+
+"
+" completor
+"
+function! s:completor(opts, ctx) abort
+  let l:before_line = getline('.')
+  let l:idx = min([strlen(l:before_line), col('.') - 2])
+  let l:idx = max([l:idx, 0])
+  let l:before_line =  l:before_line[0 : l:idx]
+
+  if len(matchstr(l:before_line, s:get_keyword_pattern() . '$')) < 1
+    return
+  endif
+
+
+  call asyncomplete#complete(
+  \   a:opts.name,
+  \   a:ctx,
+  \   a:ctx.col - strlen(matchstr(a:ctx.typed, '\k*$')),
+  \   vsnip#get_complete_items(bufnr('%'))
+  \ )
+endfunction
+
+"
+" get_keyword_pattern
+"
+function! s:get_keyword_pattern() abort
+  let l:keywords = split(&iskeyword, ',')
+  let l:keywords = filter(l:keywords, { _, k -> match(k, '\d\+-\d\+') == -1 })
+  let l:keywords = filter(l:keywords, { _, k -> k !=# '@' })
+  let l:pattern = '\%(' . join(map(l:keywords, { _, v -> '\V' . escape(v, '\') . '\m' }), '\|') . '\|\w\)*'
+  return l:pattern
+endfunction
+