inoremap <silent><expr> <TAB>
      \ pumvisible() ? "\<C-n>" :
      \ <SID>check_back_space() ? "\<TAB>" :
      \ deoplete#manual_complete()
function! s:check_back_space() abort
  let col = col('.') - 1
  return !col || getline('.')[col - 1]  =~ '\s'
endfunction
inoremap <expr><S-TAB>  pumvisible() ? "\<C-p>" : "\<C-h>"

"inoremap <expr><C-g>       deoplete#refresh()
inoremap <expr><C-e>       deoplete#cancel_popup()
inoremap <silent><expr><C-l>       deoplete#complete_common_string()
call deoplete#custom#source('_', 'matchers',
      \ ['matcher_fuzzy', 'matcher_length'])
call deoplete#custom#source('_', 'converters', [
      \ 'converter_remove_overlap',
      \ 'converter_case',
      \ 'matcher_length',
      \ 'converter_truncate_abbr',
      \ 'converter_truncate_info',
      \ 'converter_truncate_menu',
      \ ])
"let g:deoplete#enable_at_startup = 1

"let g:deoplete#auto_complete_delay = 0
call deoplete#custom#option({
      \ 'auto_complete': v:true,
      \ 'min_pattern_length': 2,
      \ 'auto_refresh_delay': 10,
      \ 'camel_case': v:true,
      \ 'skip_multibyte': v:true,
      \ 'prev_completion_mode': 'length',
      \ 'auto_complete_delay': 0,
      \ 'auto_preview': v:true,
      \ })
call deoplete#custom#option('keyword_patterns', {
      \ '_': '[a-zA-Z_]\k*\(?',
      \ 'tex': '[^\w|\s][a-zA-Z_]\w*',
      \ 'ruby': '[a-zA-Z_]\w[!?]?',
      \ })