nvim_config_lua/init.lua

-- disable netrw for nvim-tree plugin
vim.g.loaded_netrw = 1
vim.g.loaded_netrwPlugin = 1

-- configure neon theme
vim.g.neon_style = "doom"

vim.g.mapleader = ' '
vim.g.maplocalleader = ' '

-- package manager
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",
    "--branch=stable", -- latest stable release
    lazypath,
  })
end
vim.opt.rtp:prepend(lazypath)

require("lazy").setup({
  "nvim-tree/nvim-tree.lua",
  "nvim-tree/nvim-web-devicons",

  {
    "rafamadriz/neon",
    config = function ()
      vim.cmd.colorscheme("neon")
    end,
  },

  {
    "nvim-lualine/lualine.nvim",
    opts = {
      options = {
        theme = "neon",
      },
    },
  },

  -- LSP
  {
    "neovim/nvim-lspconfig",
    dependencies = {
      {'williamboman/mason.nvim', config = true},
      'williamboman/mason-lspconfig.nvim',
      { 'j-hui/fidget.nvim', tag = 'legacy', opts = {} },
      'folke/neodev.nvim',
    }
  },

	-- Show definitions and referenes in a floating window
	'rmagatti/goto-preview',

  -- Autocompletion
  {
    'hrsh7th/nvim-cmp',
    dependencies = {
      -- Snippet Engine & its associated nvim-cmp source
      'L3MON4D3/LuaSnip',
      'saadparwaiz1/cmp_luasnip',

      -- Adds LSP completion capabilities
      'hrsh7th/cmp-nvim-lsp',

      -- Adds a number of user-friendly snippets
      'rafamadriz/friendly-snippets',
    },
  },

  -- Useful plugin to show you pending keybinds.
  { 'folke/which-key.nvim', opts = {} },

  -- "gc" to comment visual regions/lines
  { 'numToStr/Comment.nvim', opts = {} },

  -- Fuzzy Finder (files, lsp, etc)
  {
    'nvim-telescope/telescope.nvim',
    branch = '0.1.x',
    dependencies = {
      'nvim-lua/plenary.nvim',
      -- Fuzzy Finder Algorithm which requires local dependencies to be built.
      -- Only load if `make` is available. Make sure you have the system
      -- requirements installed.
      {
        'nvim-telescope/telescope-fzf-native.nvim',
        -- NOTE: If you are having trouble with this installation,
        --       refer to the README for telescope-fzf-native for more instructions.
        build = 'make',
        cond = function()
          return vim.fn.executable 'make' == 1
        end,
      },
    },
  },

  -- Highlight, edit, and navigate code
  {
    'nvim-treesitter/nvim-treesitter',
    dependencies = {
      'nvim-treesitter/nvim-treesitter-textobjects',
    },
    build = ':TSUpdate',
  },

  {
    "gbprod/cutlass.nvim",
    opts = {
      cut_key = "<Leader>x",
    }
  }
})

-- copy to system clipboard by default
vim.o.clipboard = "unnamedplus"

vim.o.termguicolors = true
vim.o.completeopt = "menuone,noselect"

vim.opt.guifont = "Hack Nerd Font Mono:h12"
vim.opt.number = true
vim.opt.mouse = ""
vim.opt.hlsearch = true
vim.opt.tabstop = 2
vim.opt.shiftwidth = 2

require("nvim-tree").setup({
  view = {
    width = 30,
  },
  on_attach = function (bufnr)
    local api = require "nvim-tree.api"
    api.config.mappings.default_on_attach(bufnr)
    vim.keymap.set("n", ".", api.tree.change_root_to_node,
                   {noremap=true, silent=true, buffer=bufnr, nowait=true})
  end,
})

-- unmap space
vim.api.nvim_set_keymap('n', '<Space>', '', {noremap=true, silent=true})

-- window operations with leader key 
vim.api.nvim_set_keymap("n", "<Leader>w", "<C-w>", {noremap=true, silent=true})

-- custom nvim tree mappings
vim.api.nvim_set_keymap("n", "<Leader>ft", ":NvimTreeToggle<CR>", {noremap=true, silent=true})
vim.api.nvim_set_keymap("n", "<BS>", ":NvimTreeFocus<CR>", {noremap=true, silent=true})

-- configure telescope
-- See `:help telescope` and `:help telescope.setup()`
require('telescope').setup {
  defaults = {
    mappings = {
      i = {
        ['<C-u>'] = false,
        ['<C-d>'] = false,
      },
    },
  },
}

-- Enable telescope fzf native, if installed
pcall(require('telescope').load_extension, 'fzf')

-- See `:help telescope.builtin`
vim.keymap.set('n', '<leader>?', require('telescope.builtin').oldfiles, { desc = '[?] Find recently opened files' })
vim.keymap.set('n', '<leader><space>', require('telescope.builtin').buffers, { desc = '[ ] Find existing buffers' })
vim.keymap.set('n', '<leader>/', function()
  -- You can pass additional configuration to telescope to change theme, layout, etc.
  require('telescope.builtin').current_buffer_fuzzy_find(require('telescope.themes').get_dropdown {
    winblend = 10,
    previewer = false,
  })
end, { desc = '[/] Fuzzily search in current buffer' })

-- vim.keymap.set('n', '<leader>gf', require('telescope.builtin').git_files, { desc = 'Search [G]it [F]iles' })
vim.keymap.set('n', '<leader>ff', require('telescope.builtin').find_files, { desc = '[S]earch [F]iles' })
-- vim.keymap.set('n', '<leader>sh', require('telescope.builtin').help_tags, { desc = '[S]earch [H]elp' })
-- vim.keymap.set('n', '<leader>sw', require('telescope.builtin').grep_string, { desc = '[S]earch current [W]ord' })
-- vim.keymap.set('n', '<leader>sg', require('telescope.builtin').live_grep, { desc = '[S]earch by [G]rep' })
-- vim.keymap.set('n', '<leader>sd', require('telescope.builtin').diagnostics, { desc = '[S]earch [D]iagnostics' })



--  Configure Treesitter
-- See `:help nvim-treesitter`
require('nvim-treesitter.configs').setup {
  modules = {},

  -- Add languages to be installed here that you want installed for treesitter
  ensure_installed = { 'c', 'cpp', 'go', 'glsl', 'lua', 'python', 'rust', 'tsx', 'typescript', 'vimdoc', 'vim' },

  -- Install parsers synchronously (only applied to `ensure_installed`)
  sync_install = false,

  -- Autoinstall languages that are not installed. Defaults to false (but you can change for yourself!)
  auto_install = true,

  -- List of parsers to ignore installing (or "all")
  ignore_install = {},

  highlight = { enable = true },
  indent = { enable = true },
  incremental_selection = {
    enable = true,
    keymaps = {
      init_selection = '<c-space>',
      node_incremental = '<c-space>',
      scope_incremental = '<c-s>',
      node_decremental = '<M-space>',
    },
  },

  textobjects = {
    select = {
      enable = true,
      lookahead = true, -- Automatically jump forward to textobj, similar to targets.vim
      keymaps = {
        -- You can use the capture groups defined in textobjects.scm
        ['aa'] = '@parameter.outer',
        ['ia'] = '@parameter.inner',
        ['af'] = '@function.outer',
        ['if'] = '@function.inner',
        ['ac'] = '@class.outer',
        ['ic'] = '@class.inner',
      },
    },

    move = {
      enable = true,
      set_jumps = true, -- whether to set jumps in the jumplist
      goto_next_start = {
        [']m'] = '@function.outer',
        [']]'] = '@class.outer',
      },
      goto_next_end = {
        [']M'] = '@function.outer',
        [']['] = '@class.outer',
      },
      goto_previous_start = {
        ['[m'] = '@function.outer',
        ['[['] = '@class.outer',
      },
      goto_previous_end = {
        ['[M'] = '@function.outer',
        ['[]'] = '@class.outer',
      },
    },

    swap = {
      enable = true,
      swap_next = {
        ['<leader>a'] = '@parameter.inner',
      },
      swap_previous = {
        ['<leader>A'] = '@parameter.inner',
      },
    },
  },
}

-- Diagnostic keymaps
vim.keymap.set('n', '<Leader>dp', vim.diagnostic.goto_prev, { desc = 'Go to previous diagnostic message' })
vim.keymap.set('n', '<Leader>dn', vim.diagnostic.goto_next, { desc = 'Go to next diagnostic message' })
vim.keymap.set('n', '<leader>de', vim.diagnostic.open_float, { desc = 'Open floating diagnostic message' })
vim.keymap.set('n', '<leader>dl', vim.diagnostic.setloclist, { desc = 'Open diagnostics list' })

require('goto-preview').setup {
  default_mappings = false,
  references = { -- Configure the telescope UI for slowing the references cycling window.
    telescope = require("telescope.themes").get_dropdown({ hide_preview = false })
  },
}

-- Configure LSP
--  This function gets run when an LSP connects to a particular buffer.
local on_attach = function(_, bufnr)
  -- NOTE: Remember that lua is a real programming language, and as such it is possible
  -- to define small helper and utility functions so you don't have to repeat yourself
  -- many times.
  --
  -- In this case, we create a function that lets us more easily define mappings specific
  -- for LSP related items. It sets the mode, buffer and description for us each time.
  local nmap = function(keys, func, desc)
    if desc then
      desc = 'LSP: ' .. desc
    end

    vim.keymap.set('n', keys, func, { buffer = bufnr, desc = desc })
  end

  nmap('<leader>rn', vim.lsp.buf.rename, '[R]e[n]ame')
  nmap('<leader>ca', vim.lsp.buf.code_action, '[C]ode [A]ction')

  nmap('gd', require('goto-preview').goto_preview_definition, '[G]oto [D]efinition')
  nmap('gr', require('goto-preview').goto_preview_references, '[G]oto [R]eferences')
  nmap('gc', require('goto-preview').close_all_win, 'Close all preview windows')
  nmap('gI', vim.lsp.buf.implementation, '[G]oto [I]mplementation')
  nmap('<leader>D', vim.lsp.buf.type_definition, 'Type [D]efinition')
  nmap('<leader>ds', require('telescope.builtin').lsp_document_symbols, '[D]ocument [S]ymbols')
  nmap('<leader>ws', require('telescope.builtin').lsp_dynamic_workspace_symbols, '[W]orkspace [S]ymbols')

  -- See `:help K` for why this keymap
  nmap('K', vim.lsp.buf.hover, 'Hover Documentation')
  nmap('<C-k>', vim.lsp.buf.signature_help, 'Signature Documentation')

  -- Lesser used LSP functionality
  nmap('gD', vim.lsp.buf.declaration, '[G]oto [D]eclaration')
  nmap('<leader>wa', vim.lsp.buf.add_workspace_folder, '[W]orkspace [A]dd Folder')
  nmap('<leader>wr', vim.lsp.buf.remove_workspace_folder, '[W]orkspace [R]emove Folder')
  nmap('<leader>wl', function()
    print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
  end, '[W]orkspace [L]ist Folders')

  -- Create a command `:Format` local to the LSP buffer
  vim.api.nvim_buf_create_user_command(bufnr, 'Format', function(_)
    vim.lsp.buf.format()
  end, { desc = 'Format current buffer with LSP' })

  vim.keymap.set("v", "<leader>k", vim.lsp.buf.format, { remap = false })
end

-- Enable the following language servers
--  Feel free to add/remove any LSPs that you want here. They will automatically be installed.
--
--  Add any additional override configuration in the following tables. They will be passed to
--  the `settings` field of the server config. You must look up that documentation yourself.
--
--  If you want to override the default filetypes that your language server will attach to you can
--  define the property 'filetypes' to the map in question.
local servers = {
  clangd = {},
  gopls = {},
  pyright = {},
  rust_analyzer = {},
  -- tsserver = {},
  -- html = { filetypes = { 'html', 'twig', 'hbs'} },

  lua_ls = {
    Lua = {
      workspace = { checkThirdParty = false },
      telemetry = { enable = false },
    },
  },
}

-- Setup neovim lua configuration
require('neodev').setup()

-- nvim-cmp supports additional completion capabilities, so broadcast that to servers
local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities = require('cmp_nvim_lsp').default_capabilities(capabilities)

-- Ensure the servers above are installed
local mason_lspconfig = require 'mason-lspconfig'

mason_lspconfig.setup {
  ensure_installed = vim.tbl_keys(servers),
}

mason_lspconfig.setup_handlers {
  function(server_name)
    require('lspconfig')[server_name].setup {
      capabilities = capabilities,
      on_attach = on_attach,
      settings = servers[server_name],
      filetypes = (servers[server_name] or {}).filetypes,
    }
  end
}

-- Configure autocompletion nvim-cmp
-- See `:help cmp`
local cmp = require 'cmp'
local luasnip = require 'luasnip'
require('luasnip.loaders.from_vscode').lazy_load()
luasnip.config.setup {}

cmp.setup {
  snippet = {
    expand = function(args)
      luasnip.lsp_expand(args.body)
    end,
  },
  mapping = cmp.mapping.preset.insert {
    ['<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 {},
    ['<CR>'] = cmp.mapping.confirm {
      behavior = cmp.ConfirmBehavior.Replace,
      select = true,
    },
    ['<Tab>'] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_next_item()
      elseif luasnip.expand_or_locally_jumpable() then
        luasnip.expand_or_jump()
      else
        fallback()
      end
    end, { 'i', 's' }),
    ['<S-Tab>'] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_prev_item()
      elseif luasnip.locally_jumpable(-1) then
        luasnip.jump(-1)
      else
        fallback()
      end
    end, { 'i', 's' }),
  },
  sources = {
    { name = 'nvim_lsp' },
    { name = 'luasnip' },
  },
}

-- Do not yank when pasting over selected text
--  "x" - visual mode
vim.keymap.set("x", "p", "P", { silent = true })