arch2025/.config/nvim/lua/junikim/plugins/lsp.lua

return {
  {
    'williamboman/mason.nvim',
    lazy = false,
    opts = {},
  },

  {
    "jay-babu/mason-null-ls.nvim",
    event = { "BufReadPre", "BufNewFile" },
    dependencies = {
      "williamboman/mason.nvim",
      "nvimtools/none-ls.nvim",
    },
    config = function()
      local null_ls = require('null-ls')
      require('mason-null-ls').setup({
        ensure_installed = { "black", "gofmt" },
        automatic_installation = true,
        automatic_setup = true,
      })
      null_ls.setup({
        sources = {
          null_ls.builtins.formatting.black,
          null_ls.builtins.formatting.gofmt,
        },
      })
    end,
  },

  -- Autocompletion
  {
    'hrsh7th/nvim-cmp',
    event = 'InsertEnter',
    dependencies = {
      { "L3MON4D3/LuaSnip" },
      { 'hrsh7th/cmp-nvim-lsp' },     -- Required
      { 'hrsh7th/cmp-buffer' },       -- Optional
      { 'hrsh7th/cmp-path' },         -- Optional
      { 'saadparwaiz1/cmp_luasnip' }, -- Optional
      { 'hrsh7th/cmp-nvim-lua' },     -- Optional
    },
    config = function()
      local cmp = require('cmp')
      local luasnip = require("luasnip")
      local cmp_select = { behavior = cmp.SelectBehavior.Select }

      cmp.setup({
        sources = cmp.config.sources({
          { name = 'nvim_lsp' },
          { name = 'luasnip' },
          { name = 'path' },
          { name = 'buffer' },
          { name = 'nvim_lua' },
        }, {
          { name = 'buffer' },
        }),
        completion = {
          completeopt = 'menu,menuone,noinsert'
        },
        mapping = cmp.mapping.preset.insert({
          ['<C-p>'] = cmp.mapping.select_prev_item(cmp_select),
          ['<C-n>'] = cmp.mapping.select_next_item(cmp_select),
          ['<Tab>'] = cmp.mapping.select_next_item(cmp_select),
          ['<S-Tab>'] = cmp.mapping.abort(),
          ["<CR>"] = cmp.mapping({
            i = function(fallback)
              --  and cmp.get_selected_entry()
              if cmp.visible() then
                cmp.confirm({ behavior = cmp.ConfirmBehavior.Replace, select = true })
              else
                fallback()
              end
            end,
            s = cmp.mapping.confirm({ select = true }),
            c = cmp.mapping.confirm({ behavior = cmp.ConfirmBehavior.Replace, select = true }),
          }),
        }),
        experimental = {
          ghost_text = true
        },
        snippet = {
          expand = function(args)
            luasnip.lsp_expand(args.body)
          end,
        },
      })
    end
  },

  -- LSP
  {
    'neovim/nvim-lspconfig',
    cmd = { 'LspInfo', 'LspInstall', 'LspStart' },
    event = { 'BufReadPre', 'BufNewFile' },
    dependencies = {
      { 'hrsh7th/cmp-nvim-lsp' },
      { 'williamboman/mason.nvim' },
      { 'williamboman/mason-lspconfig.nvim' },
      { "L3MON4D3/LuaSnip" }
    },
    init = function()
      -- Reserve a space in the gutter
      -- This will avoid an annoying layout shift in the screen
      vim.opt.signcolumn = 'yes'
    end,
    config = function()
      local lsp_defaults = require('lspconfig').util.default_config

      -- Add cmp_nvim_lsp capabilities settings to lspconfig
      -- This should be executed before you configure any language server
      lsp_defaults.capabilities = vim.tbl_deep_extend(
        'force',
        lsp_defaults.capabilities,
        require('cmp_nvim_lsp').default_capabilities()
      )

      -- LspAttach is where you enable features that only work
      -- if there is a language server active in the file
      vim.api.nvim_create_autocmd('LspAttach', {
        desc = 'LSP actions',
        callback = function(event)
          local opts = { buffer = event.buf }

          vim.keymap.set('n', 'K', '<cmd>lua vim.lsp.buf.hover()<cr>', opts)
          vim.keymap.set('n', 'gd', '<cmd>lua vim.lsp.buf.definition()<cr>', opts)
          vim.keymap.set('n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<cr>', opts)
          vim.keymap.set('n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<cr>', opts)
          vim.keymap.set('n', 'go', '<cmd>lua vim.lsp.buf.type_definition()<cr>', opts)
          vim.keymap.set('n', 'gr', '<cmd>lua vim.lsp.buf.references()<cr>', opts)
          vim.keymap.set('n', 'gs', '<cmd>lua vim.lsp.buf.signature_help()<cr>', opts)
          vim.keymap.set('n', '<leader>rn', '<cmd>lua vim.lsp.buf.rename()<cr>', opts)
          vim.keymap.set({ 'n', 'x' }, '<leader>ft', '<cmd>lua vim.lsp.buf.format({async = true})<cr>', opts)
          vim.keymap.set('n', '<F4>', '<cmd>lua vim.lsp.buf.code_action()<cr>', opts)
        end,
      })

      require('mason-lspconfig').setup({
        ensure_installed = {
          'tailwindcss',
          'ts_ls',
          'texlab',
          'pyright',
          'ltex',
          'jsonls',
          'bashls',
        },
        handlers = {
          -- this first function is the "default handler"
          -- it applies to every language server without a "custom handler"
          function(server_name)
            require('lspconfig')[server_name].setup({})
          end,
        }
      })
    end
  }
}