change api for next source and previous source

fixes

Author: haorenW1025

lua/completion.lua

@@ -193,6 +193,14 @@ M.addCompletionSource = function(key, complete_item)
   source.addCompleteItems(key, complete_item)
 end
 
+M.nextSource = function()
+  source.nextCompletion()
+end
+
+M.prevSource = function()
+  source.prevCompletion()
+end
+
 M.on_attach = function(opt)
   api.nvim_command("augroup CompletionCommand")
     api.nvim_command("autocmd! * <buffer>")

plugin/completion.vim

@@ -108,6 +108,12 @@ endif
 inoremap <silent> <Plug>(completion_confirm_completion)
       \ <cmd>call completion#wrap_completion()<CR>
 
+inoremap <silent> <Plug>(completion_next_source)
+      \ <cmd>lua require'completion'.nextSource()<CR>
+
+inoremap <silent> <Plug>(completion_prev_source)
+      \ <cmd>lua require'completion'.prevSource()<CR>
+
 command! -nargs=0 CompletionToggle  lua require'completion'.completionToggle()
 
 let &cpo = s:save_cpo