Configuration and Mappings

:echo $MYVIMRC        " path to the config Vim actually loaded
:e $MYVIMRC           " edit it
:source $MYVIMRC      " reload it without restarting
:scriptnames          " every file Vim has sourced, in order
:version              " build features and config paths

:set number              " turn a boolean option on
:set nonumber           " turn it off
:set number!            " toggle it
:set number?            " show the current value
:set tabstop=4          " set a value
:set tabstop&           " reset to the default
:setlocal number        " only for this buffer or window
:set all                " every option
:verbose set number?    " which file last set this option

set nocompatible
syntax on
filetype plugin indent on

" Look
set number relativenumber
set cursorline
set scrolloff=8
set signcolumn=yes
set termguicolors
set laststatus=2
set showcmd
set colorcolumn=80

" Indentation
set expandtab
set tabstop=2 shiftwidth=2 softtabstop=2
set autoindent smartindent

" Search
set ignorecase smartcase
set hlsearch incsearch

" Files and history
set hidden
set undofile
set undodir=~/.vim/undo
set noswapfile
set nobackup
set autoread

" Behaviour
set backspace=indent,eol,start
set splitright splitbelow
set wildmenu
set wildmode=longest:full,full
set mouse=a
set clipboard=unnamedplus

" Leader
let mapleader = " "

nnoremap <key> <action>   " Normal mode, non-recursive
inoremap …                " Insert mode
vnoremap …                " Visual and Select
xnoremap …                " Visual only
cnoremap …                " Command line
tnoremap …                " Terminal mode
map / imap / vmap         " recursive versions: avoid these
noremap                   " Normal, Visual, Select, Operator-pending
<buffer>                  " scope the mapping to this buffer
<silent>                  " do not echo the command
<expr>                    " evaluate the right side as an expression

let mapleader = " "

nnoremap <leader>w :w<CR>
nnoremap <leader>q :q<CR>
nnoremap <leader>h :noh<CR>
nnoremap <leader>e :Explore<CR>

" Window navigation without the Ctrl-w prefix
nnoremap <C-h> <C-w>h
nnoremap <C-j> <C-w>j
nnoremap <C-k> <C-w>k
nnoremap <C-l> <C-w>l

" Keep the cursor centered while searching
nnoremap n nzzzv
nnoremap N Nzzzv

" Move the selected lines up and down
vnoremap J :m '>+1<CR>gv=gv
vnoremap K :m '<-2<CR>gv=gv

" Paste over a selection without losing the register
xnoremap <leader>p "_dP

" System clipboard
nnoremap <leader>y "+y
vnoremap <leader>y "+y

:map <leader>       " list every mapping under leader
:verbose nmap <C-h> " find out which file defined a mapping

iabbrev teh the
iabbrev @@ me@example.com
iabbrev ssig -- <CR>Pablo
:abclear            " clear all abbreviations

augroup MyConfig
  autocmd!
  autocmd BufWritePre * %s/\s\+$//e          " strip trailing whitespace
  autocmd FileType python setlocal shiftwidth=4 tabstop=4
  autocmd FileType markdown setlocal wrap linebreak spell
  autocmd BufReadPost * if line("'\"") > 1 && line("'\"") <= line("$")
    \ | execute "normal! g`\"" | endif       " restore cursor position
  autocmd TextYankPost * silent! lua vim.highlight.on_yank()
augroup END

command! Reload source $MYVIMRC
command! -nargs=1 Grep execute 'vimgrep /<args>/ **/*'
command! -range Sortu <line1>,<line2>sort u

function! ToggleNumber()
  if &number
    set nonumber norelativenumber
  else
    set number relativenumber
  endif
endfunction
nnoremap <leader>n :call ToggleNumber()<CR>