vim.pack.add({
    'https://github.com/neovim/nvim-lspconfig',
    -- Autocompletion
    'https://github.com/hrsh7th/cmp-nvim-lsp',
    'https://github.com/hrsh7th/cmp-buffer',
    'https://github.com/hrsh7th/cmp-path',
    'https://github.com/hrsh7th/cmp-cmdline',
    'https://github.com/hrsh7th/nvim-cmp',
    -- Snippets
    'https://github.com/hrsh7th/cmp-vsnip',
    'https://github.com/hrsh7th/vim-vsnip',
    'https://github.com/L3MON4D3/LuaSnip',
    'https://github.com/saadparwaizl/cmp_luasnip',
    -- github
    'https://github.com/petertriho/cmp-git'
})

-- Set up nvim-cmp.
local cmp = require 'cmp'

cmp.setup({
    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.
            vim.snippet.expand(args.body)            -- For native neovim snippets (Neovim v0.10+)
        end,
    },
    window = {
        completion = cmp.config.window.bordered(),
        documentation = cmp.config.window.bordered(),
    },
    mapping = cmp.mapping.preset.insert({
        ['<C-b>'] = cmp.mapping.scroll_docs(-4),
        ['<C-f>'] = cmp.mapping.scroll_docs(4),
        ['<C-Space>'] = cmp.mapping.complete(),
        ['<C-e>'] = cmp.mapping.abort(),
        ['<CR>'] = cmp.mapping.confirm({ select = true }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
    }),
    sources = cmp.config.sources({
        { name = 'nvim_lsp' },
        { name = 'luasnip' }, -- For luasnip users.
    }, {
        { name = 'buffer' },
    })
})

cmp.setup.filetype('gitcommit', {
    sources = cmp.config.sources({
        { name = 'git' },
    }, {
        { name = 'buffer' },
    })
})
require("cmp_git").setup()

-- 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' }
    }),
    matching = { disallow_symbol_nonprefix_matching = false }
})

-- Set up lspconfig.
local capabilities = require('cmp_nvim_lsp').default_capabilities()
vim.lsp.config('lua_ls', {
    capabilities = capabilities
})
vim.lsp.config('nixd', {
    cmd = { "nixd" },
    filetypes = { "nix" },
    capabilities = capabilities
})
vim.lsp.enable({ "lua_ls", "nixd" })