.dotfiles/nvim/lua/settings.lua

-- Change diagnostic signs.
vim.fn.sign_define("DiagnosticSignError", { text = "✗", texthl = "DiagnosticSignError" })
vim.fn.sign_define("DiagnosticSignWarn", { text = "!", texthl = "DiagnosticSignWarn" })
vim.fn.sign_define("DiagnosticSignInformation", { text = "", texthl = "DiagnosticSignInfo" })
vim.fn.sign_define("DiagnosticSignHint", { text = "", texthl = "DiagnosticSignHint" })
-- global config for diagnostic
vim.diagnostic.config({
  underline = false,
  virtual_text = true,
  signs = true,
  severity_sort = true,
})
-- Variables
HOME = os.getenv("HOME")

-- Basic Functions/Settings
vim.opt.backspace = "indent,eol,start" -- backspace works on every char in insert mode
vim.opt.completeopt = 'menuone,noselect'
vim.opt.history = 1000
vim.opt.startofline = true

-- UI
vim.opt.background= 'dark'
vim.opt.termguicolors = true
vim.opt.ttyfast = true
vim.opt.autoread = true
vim.opt.hlsearch = true
vim.opt.number = true
vim.opt.title = true
vim.opt.scrolloff = 1000 -- center current line in screen
vim.opt.synmaxcol = 300 -- stop syntax highlight after x lines for performance
vim.opt.laststatus = 2 -- always show status line

-- Styleguide/Preferences
vim.opt.autoindent = true

-- Localization
vim.opt.encoding = "utf-8"
vim.opt.dictionary = '/usr/share/dict/words'
vim.opt.spelllang = 'en_ca'

-- Define files to spellcheck
vim.api.nvim_create_autocmd(
    {
        "BufRead",
        "BufNewFile"
    },{
        pattern = {
            "gitcommit",
            "gitrebase",
            "*.txt",
            "*.md",
            "*.tex"
        },
        command = "setlocal spell"
    }
)

-- Mapping Timeouts
vim.opt.timeout = false
vim.opt.ttimeout = true
vim.opt.ttimeoutlen = 100

-- Display Hints/Highlights
vim.opt.colorcolumn="101"
vim.api.nvim_set_hl(0, 'ColorColumn', { bg='red' })
vim.api.nvim_set_hl(0, 'TODO', { bg='white' })
vim.api.nvim_set_hl(0, 'ExtraWhitespace', { bg='lightred' })
vim.cmd[[ match ExtraWhitespace /\s\+\%#\@<!$/ ]]
vim.cmd[[ match TODO /\bTODO\b/ ]]

vim.opt.showmatch = true -- show matching brackets
vim.opt.list = true
vim.opt.listchars = 'tab:» ,trail:·'
vim.opt.foldenable = false
vim.opt.foldlevel = 4 -- limit folding to 4 levels
vim.opt.foldmethod = 'syntax' -- use language syntax to generate folds
vim.opt.wrap = true --do not wrap lines even if very long
vim.opt.eol = false -- show if there's no eol char
vim.opt.showbreak= '↳' -- character to show when line is broken
-- Remove trailing whitespace
vim.api.nvim_create_autocmd(
    {
        "BufWritePre",
        "BufWinEnter",
        "InsertEnter",
        "InsertLeave"
    },{
        pattern = { "*" },
        command = [[%s/\s\+$//e]]
    }
)

-- Sidebar
vim.opt.number = true -- line number on the left
vim.opt.numberwidth = 4 -- always reserve 4 spaces for line number
vim.opt.signcolumn = 'yes' -- keep 1 column for coc.vim  check
vim.opt.modelines = 0
vim.opt.showcmd = true -- display command in bottom bar

-- Search
vim.opt.incsearch = true -- starts searching as soon as typing, without enter needed
vim.opt.ignorecase = true -- ignore letter case when searching
vim.opt.smartcase = true -- case insentive unless capitals used in search
vim.opt.matchtime = 2 -- delay before showing matching paren

-- White characters
vim.opt.autoindent = true
vim.opt.smartindent = true
vim.opt.tabstop = 4 -- 1 tab = 2 spaces
vim.opt.shiftwidth = 4 -- indentation rule
vim.opt.formatoptions = 'qnj1' -- q  - comment formatting; n - numbered lists; j - remove comment when joining lines; 1 - don't break after one-letter word
vim.opt.expandtab = true -- expand tab to spaces

-- Backup files
vim.opt.undodir = HOME .. '/.spool/nvim/tmp/undo//'     -- undo files
vim.opt.backup = true      -- use backup files
vim.opt.writebackup = true -- use temporary backup during write
vim.opt.backupdir = HOME .. '/.spool/nvim/tmp/backup//' -- backups
vim.opt.swapfile = false   -- don't use swap file
--vim.opt.directory = HOME .. '/.spool/nvim/tmp/swap//'   -- swap files

-- Commands mode
vim.opt.wildmenu = true -- on TAB, complete options for system command
vim.opt.wildignore = 'deps,.svn,CVS,.git,.hg,*.o,*.a,*.class,*.mo,*.la,*.so,*.obj,*.swp,*.jpg,*.png,*.xpm,*.gif,.DS_Store,*.aux,*.out,*.toc'

-- Executables
vim.g.python3_host_prog = "/var/home/jpm/.pyenv/shims/python3"
vim.g.python_host_prog = "/var/home/jpm/.pyenv/shims/python2"

-- Theme
vim.opt.background = 'dark'
vim.colorscheme = 'gruvbox'
vim.cmd([[
set t_Co=256
let g:airline_theme="base16_gruvbox_dark_hard"
let g:gruvbox_contrast_dark="hard"
let g:gruvbox_italic=1
let g:gruvbox_bold=1
let g:gruvbox_underline=1
let g:gruvbox_undercurl=1
let g:gruvbox_termcolors=256
syn on se title
]])

-- Abbreviations
vim.cmd([[
source ${HOME}/.dotfiles/vim/abbreviations/personalAbbreviations.vim
source ${HOME}/.dotfiles/vim/abbreviations/codingAbbreviations.vim
]])

-- Fix indentation in file
--viml: map <leader>i mmgg=G`m<CR>
vim.g.mapleader = ','
vim.g.maplocalleader = '\\'
vim.keymap.set("i", "kj", "<esc>", { silent = true })

-- Configure tabline
vim.cmd([[
set showtabline=2
let g:tablabel = "%N%{flagship#tabmodified()} %{flagship#tabcwds('shorten',',')}"
]])