fix: migrate from packer.nvim to lazy.nvim [1/n]

use single-file setup;
todo: cleanup after packer directory mess

.config/nvim/config/lazy.lua

@@ -0,0 +1,158 @@
+-- Bootstrap lazy.nvim
+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", 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)
+
+-- Make sure to setup `mapleader` and `maplocalleader` before
+-- loading lazy.nvim so that mappings are correct.
+-- This is also a good place to setup other settings (vim.opt)
+vim.g.mapleader = " "
+vim.g.maplocalleader = "\\"
+
+-- Setup lazy.nvim
+require("lazy").setup({
+  spec = {
+    -- import your plugins
+    --{ import = "plugins.packerSpecs" },
+    {
+        'nvim-telescope/telescope.nvim',
+        version = '0.1.8',
+        -- or, branch = '0.1.x',
+        dependencies = { {'nvim-lua/plenary.nvim'} }
+    },
+
+
+    { 'nvim-treesitter/nvim-treesitter', build = ':TSUpdate', },
+    { 'mbbill/undotree' },
+    { 'ms-jpq/coq_nvim', branch = 'coq' },
+
+    -- 9000+ Snippets
+    { 'ms-jpq/coq.artifacts', branch = 'artifacts'},
+
+    -- " lua & third party sources -- See https://github.com/ms-jpq/coq.thirdparty
+    -- " Need to **configure separately**
+    { 'ms-jpq/coq.thirdparty', branch = '3p' },
+    -- " - shell repl
+    -- " - nvim lua api
+    -- " - scientific calculator
+    -- " - comment banner
+    -- " - etc
+
+
+    -- "=====> https://github.com/andweeb/presence.nvim
+    -- { 'andweeb/presence.nvim' }
+
+    {
+        "andweeb/presence.nvim",
+        config = function()
+            require("presence"):setup({
+            -- General options
+            auto_update         = true,                       -- Update activity based on autocmd events (if `false`, map or manually execute `:lua package.loaded.presence:update()`)
+            neovim_image_text   = ":ZZ", -- Text displayed when hovered over the Neovim image
+            main_image          = "neovim",                   -- Main image display (either "neovim" or "file")
+            client_id           = "793271441293967371",       -- Use your own Discord application client id (not recommended)
+            log_level           = nil,                        -- Log messages at or above this level (one of the following: "debug", "info", "warn", "error")
+            debounce_timeout    = 10,                         -- Number of seconds to debounce events (or calls to `:lua package.loaded.presence:update(<filename>, true)`)
+            enable_line_number  = false,                      -- Displays the current line number instead of the current project
+            blacklist           = {},                         -- A list of strings or Lua patterns that disable Rich Presence if the current file name, path, or workspace matches
+            buttons             = true,                       -- Configure Rich Presence button(s), either a boolean to enable/disable, a static table (`{{ label = "<label>", url = "<url>" }, ...}`, or a function(buffer: string, repo_url: string|nil): table)
+            file_assets         = {},                         -- Custom file asset definitions keyed by file names and extensions (see default config at `lua/presence/file_assets.lua` for reference)
+            show_time           = true,                       -- Show the timer
+
+            -- Rich Presence text options
+            editing_text        = "Editing %s",               -- Format string rendered when an editable file is loaded in the buffer (either string or function(filename: string): string)
+            file_explorer_text  = "Browsing %s",              -- Format string rendered when browsing a file explorer (either string or function(file_explorer_name: string): string)
+            git_commit_text     = "Committing changes",       -- Format string rendered when committing changes in git (either string or function(filename: string): string)
+            plugin_manager_text = "Managing plugins",         -- Format string rendered when managing plugins (either string or function(plugin_manager_name: string): string)
+            reading_text        = "Reading %s",               -- Format string rendered when a read-only or unmodifiable file is loaded in the buffer (either string or function(filename: string): string)
+            workspace_text      = "Working on %s",            -- Format string rendered when in a git repository (either string or function(project_name: string|nil, filename: string): string)
+            line_number_text    = "Line %s out of %s",        -- Format string rendered when `enable_line_number` is set to true (either string or function(line_number: number, line_count: number): string)
+        })
+        end,
+    },
+
+
+    -- "=====> ncm-R for Rscripts completion
+    { 'ncm2/ncm2' },
+    { 'roxma/nvim-yarp' },
+    { 'jalvesaq/Nvim-R' },
+    { 'gaalcaras/ncm-R' },
+
+
+    -- "====> rust-analyzer dependencies
+
+    -- " Use release branch (recommend)
+    -- use ('neoclide/coc.nvim', {branch = 'master'})
+    -- " Or build from source code by using yarn: https://yarnpkg.com
+    -- use ('neoclide/coc.nvim', {
+    --     branch = 'master',
+    --     run = 'yarn install --frozen-lockfile'
+    -- })
+
+    -- " nvim-jdtls
+    { 'mfussenegger/nvim-jdtls' },
+
+
+
+    -- " Vim 8 only
+    -- uncomment on vim.init
+    -- if !has('nvim')
+    --     use ('roxma/vim-hug-neovim-rpc')
+    --  endif
+
+    -- Optional: for snippet support
+    -- Further configuration might be required, read below
+    { 'sirver/UltiSnips' },
+    { 'ncm2/ncm2-ultisnips' },
+
+    -- " Optional: better Rnoweb support (LaTeX completion)
+    { 'lervag/vimtex' },
+
+    -- lsp-zero
+    {
+      'VonHeikemen/lsp-zero.nvim',
+      branch = 'v3.x',
+      dependencies = {
+        --- Uncomment these if you want to manage LSP servers from neovim
+        {'williamboman/mason.nvim'},
+        {'williamboman/mason-lspconfig.nvim'},
+
+        -- LSP Support
+        {'neovim/nvim-lspconfig'},
+
+        -- Autocompletion
+        {'hrsh7th/nvim-cmp'},
+        {'hrsh7th/cmp-nvim-lsp'},
+        {'L3MON4D3/LuaSnip'},
+
+        },
+    },
+
+    -- nvim-platformio
+    {
+        'anurag3301/nvim-platformio.lua',
+        dependencies = {
+            {'akinsho/nvim-toggleterm.lua'},
+            {'nvim-telescope/telescope.nvim'},
+            {'nvim-lua/plenary.nvim'},
+        },
+    },
+  },
+  -- Configure any other settings here. See the documentation for more details.
+  -- colorscheme that will be used when installing plugins.
+  install = { colorscheme = { "habamax" } },
+  -- automatically check for plugin updates
+  checker = { enabled = true },
+})

.config/nvim/init.lua

@@ -1,82 +1,7 @@
 require("user.remap")
 require("tools")
-require("settings") -- user.set
-require("user.packer")
-
-vim.opt.runtimepath:prepend("~/.vim") -- counterpart of :set^=, prepend or add before all characters
-vim.opt.runtimepath:append ("~/.vim/after") -- counterpart of :set+=, append or add after all characters
-vim.o.packpath = vim.o.runtimepath
---require("~/.vimrc")
-
--- check ./lua/user/packer.lua for installed plugins
-
--- python interpreter path from virtualenv
-vim.g.python3_host_prog = "$HOME/.config/nvim/venv_nvim/neovim3/bin/python"
-
--- lsp
--- Mason Setup
---require("mason").setup({
---    ui = {
---        icons = {
---            package_installed = "",
---            package_pending = "",
---            package_uninstalled = "",
---        },
---    }
---})
---require("mason-lspconfig").setup()
---
-local lsp_zero = require('lsp-zero')
-
-lsp_zero.on_attach(function(client, bufnr)
-  local opts = {buffer = bufnr, remap = false}
-
-  vim.keymap.set("n", "gd", function() vim.lsp.buf.definition() end, opts)
-  vim.keymap.set("n", "K", function() vim.lsp.buf.hover() end, opts)
-  vim.keymap.set("n", "<leader>vws", function() vim.lsp.buf.workspace_symbol() end, opts)
-  vim.keymap.set("n", "<leader>vd", function() vim.diagnostic.open_float() end, opts)
-  vim.keymap.set("n", "[d", function() vim.diagnostic.goto_next() end, opts)
-  vim.keymap.set("n", "]d", function() vim.diagnostic.goto_prev() end, opts)
-  vim.keymap.set("n", "<leader>vca", function() vim.lsp.buf.code_action() end, opts)
-  vim.keymap.set("n", "<leader>vrr", function() vim.lsp.buf.references() end, opts)
-  vim.keymap.set("n", "<leader>vrn", function() vim.lsp.buf.rename() end, opts)
-  vim.keymap.set("i", "<C-h>", function() vim.lsp.buf.signature_help() end, opts)
-end)
-
-require('mason').setup({
-    log_level = vim.log.levels.DEBUG
-})
-require('mason-lspconfig').setup({
-  ensure_installed = {'tsserver', 'rust_analyzer', 'eslint', },
-  handlers = {
-    lsp_zero.default_setup,
-    lua_ls = function()
-      local lua_opts = lsp_zero.nvim_lua_ls()
-      require('lspconfig').lua_ls.setup(lua_opts)
-    end,
-  }
-})
-
-local cmp = require('cmp')
-local cmp_select = {behavior = cmp.SelectBehavior.Select}
-
-cmp.setup({
-  sources = {
-    {name = 'path'},
-    {name = 'nvim_lsp'},
-    {name = 'nvim_lua'},
-  },
-  formatting = lsp_zero.cmp_format(),
-  mapping = cmp.mapping.preset.insert({
-    ['<C-p>'] = cmp.mapping.select_prev_item(cmp_select),
-    ['<C-n>'] = cmp.mapping.select_next_item(cmp_select),
-    ['<C-y>'] = cmp.mapping.confirm({ select = true }),
-    ['<C-Space>'] = cmp.mapping.complete(),
-    ['<C-k>'] = cmp.mapping.scroll_docs(-4),
-    ['<C-j>'] = cmp.mapping.scroll_docs(4)
-  }),
-})
-
---
---
+--require("settings") -- user.set
+--require("user.packer")
+require("config.lazy")
+--require("plugins.packerSpecs") -- Ensure the plugins are loaded.
 

.config/nvim/lua/plugins.lua

@@ -1,20 +1,19 @@
 -- This file can be loaded by calling `lua require('plugins')` from your init.vim
 
 -- Only required if you have packer configured as `opt`
-vim.cmd [[packadd packer.nvim]]
+-- vim.cmd [[packadd packer.nvim]]
 
-return require('packer').startup(function(use)
+-- return require('packer').startup(function(use)
   -- Packer can manage itself
-  use 'wbthomason/packer.nvim'
+--  use 'wbthomason/packer.nvim'
 
-  use {
-  'nvim-telescope/telescope.nvim',
-  tag = '0.1.3',
+--  use {
+-- 'nvim-telescope/telescope.nvim',
+--  tag = '0.1.3',
   -- or, branch = '0.1.x',
-  requires = { {'nvim-lua/plenary.nvim'} }
-    }
-  use
+--  requires = { {'nvim-lua/plenary.nvim'} }
+--    }
 
-end)
+--end)
 
 -- check ./lua/user/packer.lua for installed plugins