nvim/lua/plugins/nvim-cmp.lua

-----------------------------------------------------------
-- Autocomplete configuration file
-----------------------------------------------------------

-- Plugin: nvim-cmp
-- url: https://github.com/hrsh7th/nvim-cmp


local cmp_status_ok, cmp = pcall(require, 'cmp')
if not cmp_status_ok then
  return
end

local luasnip_status_ok, luasnip = pcall(require, 'luasnip')
if not luasnip_status_ok then
  return
end

cmp.setup {
  -- Load snippet support
  snippet = {
    expand = function(args)
      luasnip.lsp_expand(args.body)
    end,
  },

  -- Completion settings
  completion = {
    --completeopt = 'menu,menuone,noselect'
    keyword_length = 2
  },

  -- Key mapping
  mapping = {
    ['<C-n>'] = cmp.mapping.select_next_item(),
    ['<C-p>'] = cmp.mapping.select_prev_item(),
    ['<C-d>'] = cmp.mapping.scroll_docs(-4),
    ['<C-f>'] = cmp.mapping.scroll_docs(4),
    ['<C-Space>'] = cmp.mapping.complete(),
    ["<C-e>"] = cmp.mapping({
    i = cmp.mapping.abort(),
    c = cmp.mapping.close(),
    }),
    ["<C-y>"] = cmp.config.disable,
    ['<CR>'] = cmp.mapping.confirm {
      select = false,
    },

    -- Tab mapping
    ['<Tab>'] = function(fallback)
      if cmp.visible() then
        cmp.select_next_item()
      elseif luasnip.expand_or_jumpable() then
        luasnip.expand_or_jump()
      else
        fallback()
      end
    end,
    ['<S-Tab>'] = function(fallback)
      if cmp.visible() then
        cmp.select_prev_item()
      elseif luasnip.jumpable(-1) then
        luasnip.jump(-1)
      else
        fallback()
      end
    end
  },

  -- Load sources, see: https://github.com/topics/nvim-cmp
  sources = {
    { name = 'nvim-lsp' },
    { name = 'luasnip' },
    { name = 'path' },
    { name = 'buffer' },
    { name = 'zsh' },
  },
}

--  see https://github.com/hrsh7th/nvim-cmp/wiki/Menu-Appearance#how-to-add-visual-studio-code-dark-theme-colors-to-the-menu
vim.cmd[[
  highlight! link CmpItemMenu Comment
  " gray
  highlight! CmpItemAbbrDeprecated guibg=NONE gui=strikethrough guifg=#808080
  " blue
  highlight! CmpItemAbbrMatch guibg=NONE guifg=#569CD6
  highlight! CmpItemAbbrMatchFuzzy guibg=NONE guifg=#569CD6
  " light blue
  highlight! CmpItemKindVariable guibg=NONE guifg=#9CDCFE
  highlight! CmpItemKindInterface guibg=NONE guifg=#9CDCFE
  highlight! CmpItemKindText guibg=NONE guifg=#9CDCFE
  " pink
  highlight! CmpItemKindFunction guibg=NONE guifg=#C586C0
  highlight! CmpItemKindMethod guibg=NONE guifg=#C586C0
  " front
  highlight! CmpItemKindKeyword guibg=NONE guifg=#D4D4D4
  highlight! CmpItemKindProperty guibg=NONE guifg=#D4D4D4
  highlight! CmpItemKindUnit guibg=NONE guifg=#D4D4D4
]]