markdown: configure the markdown environment

- Adds the `markdown-preview.nvim` plugin.
- Adds the two `vim-pandoc` and `vim-pandoc-syntax` for the support of
  markdown syntax and for file conversions with pandoc.
- Sets basic options (max width of 79 chars).
- Restores the `.gitignore` rules of the kickstart.nvim project.
- Adds and configures the Nordic colorscheme plugin.
- Sets the English, French and German spelling.
- Adds the `mkdnflow` plugin to get notebook features.

Co-Authored-by: iGor milhit <igor@milhit.ch>

.gitignore

@@ -7,3 +7,9 @@ autoload
 
 # spell *.spl
 spell/fr.utf-8.add.spl
+
+tags
+test.sh
+.luarc.json
+nvim
+lazy-lock.json

init.lua

@@ -130,11 +130,17 @@ require('lazy').setup({
   },
 
   {
-    -- Theme inspired by Atom
+    -- Nordic Theme
-    'navarasu/onedark.nvim',
+    'andersevenrud/nordic.nvim',
     priority = 1000,
     config = function()
-      vim.cmd.colorscheme 'onedark'
+      require('nordic').colorscheme({
+        underline_option = 'none',
+        italic = true,
+        italic_comments = false,
+        minimal_mode = false,
+        alternate_backgrounds = false
+      })
     end,
   },
 
@@ -145,7 +151,7 @@ require('lazy').setup({
     opts = {
       options = {
         icons_enabled = true,
-        theme = 'onedark',
+        theme = 'nord',
         component_separators = '|',
         section_separators = '/',
       },
@@ -205,6 +211,10 @@ require('lazy').setup({
   { import = 'custom.plugins' },
 }, {})
 
+-- Restore the site folder of .local/share/nvim/ in the runtime rewritten by
+-- lazy. See https://github.com/neovim/neovim/issues/23082#issuecomment-1510812311
+vim.opt.rtp:append (vim.fn.stdpath ('data') .. '/site')
+
 -- [[ Setting options ]]
 -- See `:help vim.o`
 -- NOTE: You can change these options as you wish!
@@ -215,6 +225,12 @@ vim.o.hlsearch = false
 -- Make line numbers default
 vim.wo.number = true
 
+-- Set the maximum width of a line
+vim.opt.textwidth = 79
+
+-- Set text formatting options
+-- vim.opt.formatoptions:append('a')
+
 -- Enable mouse mode
 vim.o.mouse = 'a'
 
@@ -247,6 +263,9 @@ vim.o.completeopt = 'menuone,noselect'
 -- NOTE: You should make sure your terminal supports this
 vim.o.termguicolors = true
 
+-- Set the spelling for English, French and German.
+vim.opt.spelllang = 'en,fr,de'
+
 -- [[ Basic Keymaps ]]
 
 -- Keymaps for better default experience

lazy-lock.json

@@ -1,31 +0,0 @@
-{
-  "Comment.nvim": { "branch": "master", "commit": "e1fe53117aab24c378d5e6deaad786789c360123" },
-  "LuaSnip": { "branch": "master", "commit": "a83e4b1ba7edc6fecdad09e39753a7d5eee1d01c" },
-  "cmp-nvim-lsp": { "branch": "main", "commit": "0e6b2ed705ddcff9738ec4ea838141654f12eeef" },
-  "cmp_luasnip": { "branch": "master", "commit": "18095520391186d634a0045dacaa346291096566" },
-  "fidget.nvim": { "branch": "main", "commit": "0ba1e16d07627532b6cae915cc992ecac249fb97" },
-  "friendly-snippets": { "branch": "main", "commit": "8875cccf779160303bf2bed7d422717676f214fd" },
-  "gitsigns.nvim": { "branch": "main", "commit": "f868d82a36f7f7f5e110eb0a9659993984f59875" },
-  "indent-blankline.nvim": { "branch": "master", "commit": "ceaf730b13e332cd76600d9795722413c236c684" },
-  "lazy.nvim": { "branch": "main", "commit": "ebdd0499551765e6a7aba220cc8ae4e0cdb6be69" },
-  "lualine.nvim": { "branch": "master", "commit": "05d78e9fd0cdfb4545974a5aa14b1be95a86e9c9" },
-  "markdown-preview.nvim": { "branch": "master", "commit": "02cc3874738bc0f86e4b91f09b8a0ac88aef8e96" },
-  "mason-lspconfig.nvim": { "branch": "main", "commit": "f0ce33f4794a2364eb08d09d09380e8b04ec5e6a" },
-  "mason.nvim": { "branch": "main", "commit": "08b2fd308e0107eab9f0b59d570b69089fd0b522" },
-  "neo-tree.nvim": { "branch": "v2.x", "commit": "8c89efb93b8383666a6f989762c2f610f5f2c930" },
-  "neodev.nvim": { "branch": "main", "commit": "da3e9e05c60250984f1bf069d517d9fca5315453" },
-  "nui.nvim": { "branch": "main", "commit": "2b2732528e4a79eb8542568bd51d25f710395bd6" },
-  "nvim-cmp": { "branch": "main", "commit": "b43bfaf3229d6b39d8baaa567b13c6be0623bf12" },
-  "nvim-lspconfig": { "branch": "master", "commit": "9166622781a39a829878d1fd24c174529d996838" },
-  "nvim-treesitter": { "branch": "master", "commit": "e23d5493cf14401ef02ec2e4e99b65f199869966" },
-  "nvim-treesitter-textobjects": { "branch": "master", "commit": "95b76b95eff25e1e64f363938cd853852355d70a" },
-  "nvim-web-devicons": { "branch": "master", "commit": "2a125024a137677930efcfdf720f205504c97268" },
-  "onedark.nvim": { "branch": "master", "commit": "f6e82074761473d30a722f5d90c60282de1ac41d" },
-  "plenary.nvim": { "branch": "master", "commit": "52544825d6b8be677eb395983515ad5e30ae1f2e" },
-  "telescope-fzf-native.nvim": { "branch": "main", "commit": "9bc8237565ded606e6c366a71c64c0af25cd7a50" },
-  "telescope.nvim": { "branch": "0.1.x", "commit": "533c7fb1b3fb412a16e1c1c9cf6d2b1ac130f1b7" },
-  "vim-fugitive": { "branch": "master", "commit": "5f0d280b517cacb16f59316659966c7ca5e2bea2" },
-  "vim-rhubarb": { "branch": "master", "commit": "ee69335de176d9325267b0fd2597a22901d927b1" },
-  "vim-sleuth": { "branch": "master", "commit": "1cc4557420f215d02c4d2645a748a816c220e99b" },
-  "which-key.nvim": { "branch": "main", "commit": "e271c28118998c93a14d189af3395812a1aa646c" }
-}

lua/custom/plugins/markdownpreview.lua

@@ -1,11 +1,14 @@
 -- makdown-preview.nvim
 -- installed with code found at https://github.com/iamcco/markdown-preview.nvim/issues/558#issuecomment-1514701537
 
+-- Force the light theme, no matter the system option is.
+vim.cmd([[ let g:mkdp_theme = 'light' ]])
+
 return {
   {
     "iamcco/markdown-preview.nvim",
-    ft = "markdown",
+    ft = "pandoc",
     lazy = true,
-    build = "cd app && npm install && git reset --hard",
+    build = "cd app && yarn install",
-  }
+  },
 }

lua/custom/plugins/mkdnflow.lua

@@ -0,0 +1,19 @@
+-- Mkdownflow plugin.
+--   Allows to follow links, anchors, create links, and many more.
+--   https://github.com/jakewvincent/mkdnflow.nvim
+
+-- Keymaps for mkdnflow.
+--   Table
+vim.keymap.set({'n','x','v'}, '<leader>tf', '<cmd>MkdnTableFormat<CR>', {desc = 'Format table under cursor'})
+
+return {
+  {
+    "jakewvincent/mkdnflow.nvim",
+    ft = 'pandoc',
+    lazy = true,
+    config = function ()
+      require('mkdnflow').setup({
+    })
+    end
+  }
+}

lua/custom/plugins/pandoc.lua

@@ -0,0 +1,26 @@
+-- Pandoc plugins: vim-pandoc, vim-pandoc-syntax
+
+-- Defines the filetypes that have to be recognize by vim-pandoc. Allows
+-- mardown-preview to be available with pandoc filetype.
+vim.cmd([[ let g:mkdp_filetypes = ['markdown', 'pandoc', 'pandoc.markdown'] ]])
+
+-- Sets the pandoc formatting mode to hardwrap
+vim.cmd([[ let g:pandoc#formatting#mode="hA" ]])
+
+-- Keymaps to switch to soft or hardwarp, or to toggle.
+vim.keymap.set('n', '<leader>sw', '<cmd>call pandoc#formatting#UseSoftWraps()<CR>', {desc = 'Switch to softwrap'})
+vim.keymap.set('n', '<leader>hw', '<cmd>call pandoc#formatting#UseHardWraps()<CR>', {desc = 'Switch to hardwrap'})
+vim.keymap.set('n', '<leader>tw', '<cmd>call pandoc#formatting#ToggleAutoformat()<CR>', {desc = 'Toggle autoformat, to deactivate it'})
+
+return {
+  {
+    "vim-pandoc/vim-pandoc",
+    ft = "pandoc",
+    lazy = true,
+  },
+  {
+    "vim-pandoc/vim-pandoc-syntax",
+    ft = "pandoc",
+    lazy = true,
+  },
+}