system/nix/progs/nvim/lua/basic.lua

-------------------------------------------------------------------------------
--
-- Basic Settings
--

vim.cmd 'filetype off'

-- Leaders
vim.g.mapleader = ','
vim.g.maplocalleader = '-'

-- Better Unix support
vim.opt.viewoptions = {'folds', 'options', 'cursor', 'unix', 'slash'}
vim.opt.encoding = 'utf-8'

-- True color support
vim.opt.termguicolors = true

-- Theme (required plugin 'material-vim')
-- Available styles: default, planight, ocean, lighter
-- darker, default-community, palenight-community, ocean-community,
-- lighter-community, darker-community
vim.g.material_theme_style = 'default'
vim.g.lightline = { colorscheme = 'material_vim' }
vim.cmd 'colorscheme material'

-- Other options
vim.cmd 'syntax on'
vim.opt.backspace = {'indent', 'eol', 'start'}
vim.opt.laststatus = 2
vim.opt.showmode = false

-- Tabs as spaces
vim.opt.expandtab = true
vim.opt.tabstop = 2
vim.opt.softtabstop = 2
vim.opt.shiftwidth = 2

-- Fixes broken cursor on Linux
vim.opt.guicursor = ''

-- Disable mouse / touchpad
vim.opt.mouse = ''

-- Incremental substitutin
vim.opt.inccommand = 'split'

-------------------------------------------------------------------------------
--
-- General editor options
--

-- Hide files when leaving them.
vim.opt.hidden = true
-- Show line numbers.
vim.opt.number = true
-- Minimum line number column width.
vim.opt.numberwidth = 1
-- Number of screen lines to use for the commandline.
vim.opt.cmdheight = 2
-- Lines length limit (0 if no limit).
vim.opt.textwidth = 0
-- Don't cut lines in the middle of a work.
vim.opt.linebreak = true
-- Show matching parenthesis.
vim.opt.showmatch = true
-- Time during which the matching parenthesis is shown.
vim.opt.matchtime = 2
-- Sensible default line auto cutting and formatting.
vim.opt.formatoptions = 'jtcrq'
-- Copy/Past to/from clipboard.
vim.opt.clipboard = 'unnamedplus'
-- Highlight line cursor is currently on.
vim.opt.cursorline = true
-- Select the first item of popup menu automatically without inserting it.
vim.opt.completeopt:append('noinsert')
-- Invisible characters representation when :set list
vim.opt.listchars = {
  tab = '→ ',
  trail = '~',
  nbsp = '␣',
  eol = '¬',
}

-- Search
-- Incremental search.
vim.opt.incsearch = true
-- Case insensitive.
vim.opt.ignorecase = true
-- Case insensitive if no uppercase letter in pattern, case sensitive otherwise.
vim.opt.smartcase = true

-- Spell
vim.opt.spelllang = 'en,ru'

-- Fold level
vim.opt.foldlevel = 99
vim.opt.foldlevelstart = 99
vim.opt.foldminlines = 3
vim.opt.foldnestmax = 5

-------------------------------------------------------------------------------
--
-- File type specified
--
local bufReadFile = {'BufNewFile', 'BufRead'}

-- Set up a line limiter for each lang
local line_limiter_augroup = vim.api.nvim_create_augroup('line_limiter', {})
local function set_line_limiter(limit, patterns)
  vim.api.nvim_create_autocmd(bufReadFile, {
    pattern = patterns,
    group = line_limiter_augroup,
    callback = function () vim.wo.colorcolumn = tostring(limit) end,
  })
end

set_line_limiter(101, {
  '*.nix',
  '*.vim',
  '*.lua',
  '*.ts',
  '*.tsx',
  '*.js',
  '*.jsx',
  '*.rs',
})
set_line_limiter(81, {
  '*.json',
  '*.yml',
  '*.yaml',
  '*.md',
  '*.html',
  '*.css',
})

-- Spell check for markdown files
local spell_check_augroup = vim.api.nvim_create_augroup('spell_check', {})
vim.api.nvim_create_autocmd(bufReadFile, {
  pattern = { '*.md' },
  group = spell_check_augroup,
  callback = function () vim.wo.spell = true end,
})

-- Set up fold method for each lang
local folding_augroup = vim.api.nvim_create_augroup('folding', {})
vim.api.nvim_create_autocmd(bufReadFile, {
  group = folding_augroup,
  pattern = {
    '*.js',
    '*.jsx',
    '*.ts',
    '*.tsx',
  },
  callback = function ()
    vim.cmd 'syntax on'
    vim.wo.foldmethod = 'syntax'
  end,
})


-------------------------------------------------------------------------------
--
-- Bindings
--
local function clear_search_hl() vim.opt.hlsearch = false end
vim.keymap.set('n', '<C-z>', clear_search_hl, { desc = 'Clear search highlighting' })

-- Enable fast navigation between windows
vim.keymap.set('n', '<C-h>', '<C-W>h')
vim.keymap.set('n', '<C-l>', '<C-W>l')
vim.keymap.set('n', '<C-j>', '<C-W>j')
vim.keymap.set('n', '<C-k>', '<C-W>k')

-- Disable the annoying and useless ex-mode
vim.keymap.set('n', 'Q', '<nop>')
vim.keymap.set('n', 'gQ', '<nop>')

-- Disable arrow keys
vim.keymap.set('n', '<Up>', '<nop>')
vim.keymap.set('n', '<Down>', '<nop>')
vim.keymap.set('n', '<Left>', '<nop>')
vim.keymap.set('n', '<Right>', '<nop>')
vim.keymap.set('v', '<Up>', '<nop>')
vim.keymap.set('v', '<Down>', '<nop>')
vim.keymap.set('v', '<Left>', '<nop>')
vim.keymap.set('v', '<Right>', '<nop>')
-- ... instead of insert mode for rus lang
vim.keymap.set('i', '<Up>', '<nop>')
vim.keymap.set('i', '<Down>', '<nop>')
vim.keymap.set('i', '<Left>', '<nop>')
vim.keymap.set('i', '<Right>', '<nop>')

-- Disable page up / down
vim.keymap.set('n', '<PageUp>', '<nop>')
vim.keymap.set('n', '<PageDown>', '<nop>')
vim.keymap.set('v', '<PageUp>', '<nop>')
vim.keymap.set('v', '<PageDown>', '<nop>')
vim.keymap.set('i', '<PageUp>', '<nop>')
vim.keymap.set('i', '<PageDown>', '<nop>')

-------------------------------------------------------------------------------
--
-- Abbreviatures
--
vim.cmd 'cabbrev bsp belowright split'
vim.cmd 'cabbrev rvsp belowright vsplit'