dot/nvim/init.lua

-- nvim optimizations 
vim.loader.enable()  

-- bootstrap lazy.nvim
local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
    vim.fn.system({ "git", "clone", "--filter=blob:none", "https://github.com/folke/lazy.nvim.git", lazypath })
end
vim.opt.rtp:prepend(lazypath)

require("lazy").setup({
    { "nvim-lualine/lualine.nvim" },
    { "nvim-telescope/telescope.nvim",lazy = false, dependencies = "nvim-lua/plenary.nvim" },
    { "neovim/nvim-lspconfig" },
    { "williamboman/mason.nvim", config = true },
    { "mason-org/mason-lspconfig.nvim", opts = {}, dependencies = {"mason-org/mason.nvim"}}, 
    { "nvim-treesitter/nvim-treesitter", build = ":TSUpdate",  
    config =  function()
        require("nvim-treesitter.configs").setup({
            highlight = { enable = true },
            indent = { enable = true },
        })
    end,},
    { "hrsh7th/nvim-cmp", dependencies = {
        "hrsh7th/cmp-nvim-lsp",
        "hrsh7th/cmp-buffer",
        "hrsh7th/cmp-path",
        "L3MON4D3/LuaSnip",
        "saadparwaiz1/cmp_luasnip",
    }
},
{ "akinsho/toggleterm.nvim", version = "*", config = true },
{ "sindrets/diffview.nvim", dependencies = "nvim-lua/plenary.nvim" },
{ "airblade/vim-gitgutter" },
{ 'windwp/nvim-autopairs', event = "InsertEnter", config = true },
{"FabijanZulj/blame.nvim"},
{
    "rebelot/kanagawa.nvim",
    config = function()
        require("kanagawa").setup({
            commentStyle = { italic = true },
            keywordStyle = { italic = true },
            statementStyle = { bold = true },
            theme = "wave",
            background = { dark = "wave", light = "lotus" },
        })
        vim.cmd("colorscheme kanagawa")
    end,
},
{
  "scalameta/nvim-metals",
  ft = { "scala", "sbt", "java" },
  opts = function()
    local metals_config = require("metals").bare_config()
    metals_config.on_attach = function(client, bufnr)
      -- your on_attach function
    end

    return metals_config
  end,
  config = function(self, metals_config)
    local nvim_metals_group = vim.api.nvim_create_augroup("nvim-metals", { clear = true })
    vim.api.nvim_create_autocmd("FileType", {
      pattern = self.ft,
      callback = function()
        require("metals").initialize_or_attach(metals_config)
      end,
      group = nvim_metals_group,
    })
  end
}
})

-- neovim configuration

vim.o.termguicolors = true
vim.o.encoding        = 'utf-8'
vim.o.fileencoding    = 'utf-8'
vim.o.tabstop         = 4
vim.o.softtabstop     = 4
vim.o.shiftwidth      = 4
vim.o.expandtab       = true
vim.o.smartindent     = true
vim.o.number          = true
-- breaks telescope
vim.o.cursorline      = true
vim.o.clipboard       = 'unnamedplus'
vim.o.wildmenu        = true
vim.o.laststatus      = 0
vim.o.cmdheight       = 0
vim.o.undofile        = true
vim.o.hlsearch        = true
vim.o.incsearch       = true
vim.o.ignorecase      = true
vim.o.smartcase       = true
vim.o.errorbells      = false
vim.g.mapleader       = ' '
vim.o.mouse         = nil
vim.o.autoread        = true
vim.o.swapfile        = true 
vim.o.wildmode        = longest

-- Telescope Keybinds
vim.keymap.set('n', '<leader><leader>', require('telescope.builtin').find_files)
vim.keymap.set('n', '<leader>fg', require('telescope.builtin').live_grep)
vim.keymap.set('n', '<leader>fb', require('telescope.builtin').buffers)
vim.keymap.set('n', '<leader>fh', require('telescope.builtin').help_tags)
vim.keymap.set('n', '<leader>fr', require('telescope.builtin').lsp_references)
vim.keymap.set('n', '<leader>frr', require('telescope.builtin').diagnostics)

-- Error Keymaps
vim.keymap.set('n', '<leader>nr', vim.diagnostic.goto_next);
vim.keymap.set('n', '<leader>or', vim.diagnostic.open_float);

-- transparent background
vim.api.nvim_set_hl(0, 'Normal', { bg = 'none' })
vim.api.nvim_set_hl(0, 'NormalFloat', { bg = 'none' })
vim.api.nvim_set_hl(0, 'FloatBorder', { bg = 'none' })
vim.api.nvim_set_hl(0, 'Pmenu', { bg = 'none' })

-- Format go files
vim.keymap.set('n', '<leader>gf', function() require('go.format').goimport() end)

-- Diffview
vim.api.nvim_set_keymap('n', '<leader>do', ':DiffviewOpen<CR>', { noremap = true, silent = true })
vim.api.nvim_set_keymap('n', '<leader>dc', ':DiffviewClose<CR>', { noremap = true, silent = true })
vim.api.nvim_set_keymap('n', '<leader>dh', ':DiffviewFileHistory<CR>', { noremap = true, silent = true })

local capabilities = require('cmp_nvim_lsp').default_capabilities()
local lspconfig = require("lspconfig")

local cmp = require'cmp'
cmp.setup({
    snippet = { expand = function(args) require('luasnip').lsp_expand(args.body) end },
    mapping = cmp.mapping.preset.insert({
        ['<A-Space>'] = cmp.mapping.complete(),
        ['<Tab>'] = cmp.mapping.confirm({ select = true }),
        ['<Down>'] = cmp.mapping.select_next_item(),
        ['<Up>'] = cmp.mapping.select_prev_item(),
    }),
    sources = cmp.config.sources({
        { name = 'nvim_lsp' },
        { name = 'luasnip' },
    }, {
        { name = 'buffer' },
        { name = 'path' },
    })
})

vim.lsp.config["gopls"] = {
    cmd = { vim.fn.stdpath("data") .. "/mason/bin/gopls" },
    capabilities = require('cmp_nvim_lsp').default_capabilities(),
    root_markers = { "go.mod", "go.work", ".git" },
    settings = {
        gopls = {
            analyses = {
                unusedparams = true,
                shadow = true,
            },
            staticcheck = true,
        },
    },
}


require("mason").setup()
require("mason-lspconfig").setup({
    automatic_installation = true,
})

-- Standalone gopls LSP (NO MASON)

local capabilities = require('cmp_nvim_lsp').default_capabilities()

vim.lsp.config('gopls', {
  cmd = { 'gopls' },   -- uses system-installed gopls from PATH
  filetypes = { 'go', 'gomod', 'gowork', 'gotmpl' },
  root_markers = { 'go.mod', 'go.work', '.git' },
  capabilities = capabilities,
  settings = {
    gopls = {
      analyses = {
        unusedparams = true,
        shadow = true,
      },
      staticcheck = true,
    }
  }
})

vim.lsp.enable('gopls')

require('lualine').setup {
    options = {
        theme = 'iceberg_dark',
        section_separators = '',
        component_separators = '',
        icons_enabled = true,
        globalstatus = true,
        always_divide_middle = false,
        always_show_tabline = false,
        draw_empty = false,
        color = nil,
    },
    sections = {
        lualine_a = {'mode'},
        lualine_b = {'branch','diff','diagnostics'},
        lualine_c = {
            {
                'filename',
                file_status = true,
                newfile_status = true,
                path = 2
            }
        },
        lualine_x = {'lsp_status'},
        lualine_y = {
            {
                'filetype', colored = false, icon_only = true
            }
        },
        lualine_z = {'location'}
    },
}