let g:mucomplete#enable_auto_at_startup = 1
let g:mucomplete#minimum_prefix_length = 1
let g:mucomplete#empty_text_auto = 1
let g:mucomplete#no_mappings = 1

let g:mucomplete#can_complete = {}
let s:default_cond = { t -> strlen(&omnifunc) > 0 && t =~# '\%(\.\)$' }
let g:mucomplete#can_complete.default = { 'omni': s:default_cond }
let g:mucomplete#chains = {}
let g:mucomplete#chains.default =
      \ [ 'ulti', 'user', 'omni', 'c-p', 'path' ]

let s:c_cond = { t -> strlen(&omnifunc) > 0 && t =~# '\%(\.\|->\)$' }
let g:mucomplete#can_complete.c = { 'omni': s:c_cond }
let g:mucomplete#can_complete.objc = { 'omni': s:c_cond }

let s:cpp_cond = { t -> strlen(&omnifunc) > 0 && t =~# '\%(\.\|->\|::\)$' }
let g:mucomplete#can_complete.cpp = { 'omni': s:cpp_cond }
let g:mucomplete#can_complete.objcpp = { 'omni': s:cpp_cond }
let g:mucomplete#can_complete.cuda = { 'omni': s:cpp_cond }

imap <s-tab> <plug>(MUcompleteBwd)
imap <expr> <c-g><c-g> pumvisible() ? "\<plug>(MUcompleteOut)" : "\<esc>"

" Integrate with UltiSnips

inoremap <silent> <expr> <plug>MyCR
    \ mucomplete#ultisnips#expand_snippet("\<cr>")
imap <cr> <plug>MyCR

let g:ulti_expand_or_jump_res = 0

fun! TryUltiSnips()
  if !pumvisible() " With the pop-up menu open, let Tab move down
    call UltiSnips#ExpandSnippetOrJump()
  endif
  return ''
endf

fun! TryMUcomplete()
  return g:ulti_expand_or_jump_res ? "" : "\<plug>(MUcompleteFwd)"
endf

inoremap <plug>(TryUlti) <c-r>=TryUltiSnips()<cr>
imap <expr> <silent> <plug>(TryMU) TryMUcomplete()
imap <expr> <silent> <tab> "\<plug>(TryUlti)\<plug>(TryMU)"

packadd vim-mucomplete