neovim/lua/plugins/cmp.lua

-- Completion plugin config

local utils = require('utils')

vim.cmd [[set shortmess+=c]]
utils.opt('o', 'completeopt', 'menuone,noselect')

local cmp = require('cmp')
local cmp_kinds = {
    Text = '  ',
    Method = '󰊕  ',
    Function = '󰊕  ',
    Constructor = '  ',
    Field = '  ',
    Variable = '  ',
    Class = '  ',
    Interface = '  ',
    Module = '  ',
    Property = '  ',
    Unit = '  ',
    Value = '  ',
    Enum = '  ',
    Keyword = '  ',
    Snippet = '  ',
    Color = '  ',
    File = '  ',
    Reference = '  ',
    Folder = '  ',
    EnumMember = '  ',
    Constant = '  ',
    Struct = '  ',
    Event = '  ',
    Operator = '  ',
    TypeParameter = '  ',
}

cmp.setup({
    formatting = {
        format = function(entry, vim_item)
            -- Kind icons
            vim_item.kind = string.format('%s %s', cmp_kinds[vim_item.kind], vim_item.kind)
            vim_item.menu = ({
                buffer = "[Buffer]",
                nvim_lsp = "[LSP]",
                luasnip = "[LuaSnip]",
                nvim_lua = "[Lua]",
                latex_symbols = "[LaTeX]",
            })[entry.source.name]
            return vim_item
        end
    },
    snippet = {
      -- REQUIRED - you must specify a snippet engine
      expand = function(args)
        vim.fn["vsnip#anonymous"](args.body) -- For `vsnip` users.
        -- require('luasnip').lsp_expand(args.body) -- For `luasnip` users.
        -- require('snippy').expand_snippet(args.body) -- For `snippy` users.
        -- vim.fn["UltiSnips#Anon"](args.body) -- For `ultisnips` users.
      end,
    },
    window = {
      completion = cmp.config.window.bordered(),
      documentation = cmp.config.window.bordered(),
    },
    completion = {
        autocomplete = false,
    },
    mapping = cmp.mapping.preset.insert({
      ['<C-b>'] = cmp.mapping.scroll_docs(-4),
      ['<C-f>'] = cmp.mapping.scroll_docs(4),
      ['<C-x><C-o>'] = cmp.mapping.complete(),
      ['<C-e>'] = cmp.mapping.abort(),
      ['<CR>'] = cmp.mapping.confirm({ select = false }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
    }),
    sources = cmp.config.sources({
      { name = 'nvim_lsp' },
      { name = 'vsnip' }, -- For vsnip users.
      -- { name = 'luasnip' }, -- For luasnip users.
      -- { name = 'ultisnips' }, -- For ultisnips users.
      -- { name = 'snippy' }, -- For snippy users.
    }, {
      { name = 'buffer' },
    })
})

-- Set configuration for specific filetype.
--cmp.setup.filetype('gitcommit', {
--    sources = cmp.config.sources({
--        { name = 'git' }, -- You can specify the `git` source if [you were installed it](https://github.com/petertriho/cmp-git).
--    }, {
--        { name = 'buffer' },
--    })
--})

-- Use buffer source for `/` and `?` (if you enabled `native_menu`, this won't work anymore).
cmp.setup.cmdline({ '/', '?' }, {
    mapping = cmp.mapping.preset.cmdline(),
    sources = {
        { name = 'buffer' }
    }
})

-- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
cmp.setup.cmdline(':', {
    mapping = cmp.mapping.preset.cmdline(),
    sources = cmp.config.sources({
        { name = 'path' }
    }, {
        { name = 'cmdline' }
    })
})