My .vimrc

syntax on
set noerrorbells
set tabstop=4 softtabstop=4
set shiftwidth=4
set expandtab
set mouse=a
set smartindent
set number
set relativenumber
set ignorecase
set smartcase
set nobackup
set undodir=~/.vim/undodir
set undofile
set incsearch
set mouse=a
set scrolloff=3

set langmenu=en_GB
let $LANG = 'en_GB'

command Focus set foldcolumn=5
command NoFocus set foldcolumn=0

nnoremap <SPACE> <Nop>
let mapleader=" "

set colorcolumn=80
highlight ColorColumn ctermbg=0 guibg=lightgray

nnoremap <C-h>       <C-w>h
nnoremap <C-j>       <C-w>j
nnoremap <C-k>       <C-w>k
nnoremap <C-l>       <C-w>l

nnoremap <M-h>       :vertical resize -3<CR>
nnoremap <M-l>       :vertical resize +3<CR>
nnoremap <M-k>       :resize +3<CR>
nnoremap <M-j>       :resize -3<CR>
nnoremap <F3>        :setlocal spell! spelllang=pl,en_gb,de<CR>
nnoremap <leader><leader>   /%-%<CR>:noh<CR>v2lc

inoremap .      .<c-g>u
inoremap ?      ?<c-g>u
inoremap !      !<c-g>u
inoremap ,      ,<c-g>u
inoremap ;      ;<c-g>u
tnoremap <Esc>  <C-\><C-n>

nnoremap <leader>w   :w<CR>

" map <C-o>            :NERDTreeToggle<CR>

autocmd BufNewFile,BufRead *.tex nnoremap <F5>  :!latexmk -pdf '<C-R>%'<CR>
autocmd BufNewFile,BufRead *.tex,*.txt setlocal spell! spelllang=pl,en_gb,de
autocmd BufNewFile *.tex 0r ~/.vim/templates/basic-latex.tex
autocmd BufNewFile *.cpp 0r ~/.vim/templates/basic-cpp.cpp

set background=dark

call plug#begin('~/.vim/plugged')

Plug 'morhetz/gruvbox'
" Plug 'preservim/nerdtree'
Plug 'preservim/nerdcommenter'
" Plug 'neoclide/coc.nvim', {'branch': 'release'}
Plug 'itchyny/lightline.vim'
" Plug 'jiangmiao/auto-pairs'
Plug 'tmsvg/pear-tree'
Plug 'lervag/vimtex'
Plug 'joshdick/onedark.vim'
" Plug 'ycm-core/YouCompleteMe'
" Plug 'mhinz/vim-startify'

call plug#end()

colorscheme gruvbox

let g:tex_flavor='latex'
let g:vimtex_view_automatic=0
let g:python3_host_prog='/usr/local/bin/python3'