nvim_config_lua/init.lua

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

-- override stdpath locations, so that config is fully hermetic
local orig_stdpath = vim.fn.stdpath
vim.fn.stdpath = function(value)
    local config_path = orig_stdpath("config")

    if value == "config" then
      return config_path
    end

    if value == "data" then
        return config_path .. "/data"
    end

    if value == "cache" then
      return config_path .. "/cache"
    end

    if value == "state" then
      return config_path .. "/state"
    end

    return orig_stdpath(value)
end

-- package manager
local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
if not (vim.uv or vim.loop).fs_stat(lazypath) then
  local lazyrepo = "https://github.com/folke/lazy.nvim.git"
  local out = vim.fn.system({
    "git",
    "clone",
    "--filter=blob:none",
    "--branch=stable", -- latest stable release
    lazyrepo,
    lazypath,
  })
  if vim.v.shell_error ~= 0 then
    vim.api.nvim_echo({
      { "Failed to clone lazy.nvim:\n", "ErrorMsg" },
      { out, "WarningMsg" },
      { "\nPress any key to exit..." },
    }, true, {})
    vim.fn.getchar()
    os.exit(1)
  end
end
vim.opt.rtp:prepend(lazypath)

-- set space key as a leader key,
-- this has to be done before loading lazy.nvim
vim.g.mapleader = ' '
vim.g.maplocalleader = ' '

require("lazy").setup({
  spec = {
    -- color theme
    {
      "catppuccin/nvim",
      name = "catppuccin",
      -- make sure to load this during startup
      lazy = false,
      -- make sure to load this beofre all other plugins
      priority = 1000,
      config = function()
        vim.cmd.colorscheme("catppuccin-macchiato")
      end,
    },


    "nvim-tree/nvim-tree.lua",
    "nvim-tree/nvim-web-devicons",
    "nvim-lualine/lualine.nvim",

    -- LSP
    {
      "mason-org/mason-lspconfig.nvim",
      opts = {
        ensure_installed = {
          "lua_ls",
          "rust_analyzer",
          "pyright",
          "clangd",
        },
      },
      dependencies = {
        { "mason-org/mason.nvim", opts = {} },
        "neovim/nvim-lspconfig",
      }
    },
    -- configure lua language server for nvim config file
    {
      "folke/lazydev.nvim",
      ft = "lua", -- only load for lua files
      opts = {},
    },

    -- venv selector for python
    {
      "linux-cultist/venv-selector.nvim",
      dependencies = {
        "neovim/nvim-lspconfig",
        {
          "nvim-telescope/telescope.nvim",
          branch = "0.1.x",
          dependencies = { "nvim-lua/plenary.nvim" }
        }, -- optional: you can also use fzf-lua, snacks, mini-pick instead.
      },
      ft = "python", -- Load when opening Python files
      keys = {
        { ",v", "<cmd>VenvSelect<cr>" }, -- Open picker on keymap
      },
      opts = { -- this can be an empty lua table - just showing below for clarity.
        search = {}, -- if you add your own searches, they go here.
        options = {} -- if you add plugin options, they go here.
      },
    },

    -- Autocompletion
    -- TODO: look into github.com/ms-jpq/coq_nvim
    {
      '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",

    -- "gc" to comment visual regions/lines
    "numToStr/Comment.nvim",

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

    -- Cut text without populating unnamed register
    {
      "gbprod/cutlass.nvim",
      opts = {
        cut_key = "<Leader>x",
      }
    },
  },

  -- automatically check for plugin updates
  checker = { enabled = true },
})

-- 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("lualine").setup({})

--  Configure Treesitter
require('nvim-treesitter').install {
  'haskell', 'c', 'cpp', 'go', 'glsl', 'lua', 'python', 'rust', 'tsx',
  'typescript', 'javascript', 'vimdoc', 'vim', 'zig'
}

require("nvim-tree").setup({
  view = {
    width = 30,
  },
  on_attach = function (bufnr)
    local api = require "nvim-tree.api"
    --api.config.mappings.default_on_attach()
    api.map.on_attach.default(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})

-- Diagnostic keymaps
vim.keymap.set('n', '<Leader>dp',
  function() vim.diagnostic.jump({count=-1, float=true}) end,
  { desc = 'Go to previous diagnostic message' })
vim.keymap.set('n', '<Leader>dn',
  function() vim.diagnostic.jump({count=1, float=true}) end,
  { 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' })

-- 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)

-- 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 })


-- Auto format selected code
vim.keymap.set("v", "<leader>f", function()
  local start_pos = vim.api.nvim_buf_get_mark(0, "<")
  local end_pos = vim.api.nvim_buf_get_mark(0, ">")

  vim.lsp.buf.format({
    range = {
      ["start"] = { start_pos[1] - 1, start_pos[2] },
      ["end"] = { end_pos[1] - 1, end_pos[2] },
    },
  })
end)