set completeopt=menu,menuone,noselect

" Expand
imap <expr> <C-j>   vsnip#expandable()  ? '<Plug>(vsnip-expand)'         : '<C-j>'
smap <expr> <C-j>   vsnip#expandable()  ? '<Plug>(vsnip-expand)'         : '<C-j>'

" Expand or jump
imap <expr> <C-l>   vsnip#available(1)  ? '<Plug>(vsnip-expand-or-jump)' : '<C-l>'
smap <expr> <C-l>   vsnip#available(1)  ? '<Plug>(vsnip-expand-or-jump)' : '<C-l>'

" Jump forward or backward
imap <expr> <Tab>   vsnip#jumpable(1)   ? '<Plug>(vsnip-jump-next)'      : '<Tab>'
smap <expr> <Tab>   vsnip#jumpable(1)   ? '<Plug>(vsnip-jump-next)'      : '<Tab>'
imap <expr> <S-Tab> vsnip#jumpable(-1)  ? '<Plug>(vsnip-jump-prev)'      : '<S-Tab>'
smap <expr> <S-Tab> vsnip#jumpable(-1)  ? '<Plug>(vsnip-jump-prev)'      : '<S-Tab>'

" Select or cut text to use as $TM_SELECTED_TEXT in the next snippet.
" See https://github.com/hrsh7th/vim-vsnip/pull/50
nmap        s   <Plug>(vsnip-select-text)
xmap        s   <Plug>(vsnip-select-text)
nmap        S   <Plug>(vsnip-cut-text)
xmap        S   <Plug>(vsnip-cut-text)

lua <<EOF
  -- Setup nvim-cmp.
  local cmp = require'cmp'

  cmp.setup({
    snippet = {
      expand = function(args)
        -- For `vsnip` user.
        vim.fn["vsnip#anonymous"](args.body)

        -- For `luasnip` user.
        -- require('luasnip').lsp_expand(args.body)

        -- For `ultisnips` user.
        -- vim.fn["UltiSnips#Anon"](args.body)
      end,
    },
    mapping = {
      ['<C-n>'] = cmp.mapping.select_next_item({ behavior = cmp.SelectBehavior.Insert }),
      ['<C-p>'] = cmp.mapping.select_prev_item({ behavior = cmp.SelectBehavior.Insert }),
      ['<Down>'] = cmp.mapping.select_next_item({ behavior = cmp.SelectBehavior.Select }),
      ['<Up>'] = cmp.mapping.select_prev_item({ behavior = cmp.SelectBehavior.Select }),
      ['<C-d>'] = cmp.mapping.scroll_docs(-4),
      ['<C-f>'] = cmp.mapping.scroll_docs(4),
      ['<C-Space>'] = cmp.mapping.complete(),
      ['<C-e>'] = cmp.mapping.close(),
      ['<Tab>'] = cmp.mapping(cmp.mapping.select_next_item(), { 'i', 's' }),
      ['<CR>'] = cmp.mapping.confirm({
        behavior = cmp.ConfirmBehavior.Replace,
        select = true,
      })
    },
    sources = {
      { name = 'nvim_lsp' },

      -- For vsnip user.
      { name = 'vsnip' },

      -- For luasnip user.
      -- { name = 'luasnip' },

      -- For ultisnips user.
      -- { name = 'ultisnips' },

      { name = 'buffer' },
    }
  })
EOF