My vim config file

.vimrc

set nocompatible
filetype off
syntax enable
set encoding=utf-8
set number          " show line numbers
set showcmd         " show command in bottom bar
set cursorline      " highlight current line
set signcolumn=yes  " show column in front of line number column, used by linter, e.g.
set wrap
set mouse=a

set wildmenu        " visual autocomplete for command menu
set wildoptions=pum " show autocomple in popup

:set showmatch      " jump to matching bracket when insert one
:set matchtime=3    " speed up showmatch
" make showmatch scrollable
inoremap } }<Left><c-o>%<c-o>:sleep 500m<CR><c-o>%<c-o>a
inoremap ] ]<Left><c-o>%<c-o>:sleep 500m<CR><c-o>%<c-o>a
inoremap ) )<Left><c-o>%<c-o>:sleep 500m<CR><c-o>%<c-o>a
" don't forget about '%' to jump between corresponding brackets

" Without this line you cannot erase old symbols, any indentation and lines in
" Edit mode.
set backspace=indent,eol,start

" Next 3 lines makes tab = 4 spaces
" Nice explanation: https://stackoverflow.com/questions/1878974/redefine-tab-as-4-spaces
set shiftwidth=4 smarttab
set expandtab
set tabstop=8 softtabstop=0

" Show color column at 80 characters width, visual reminder of keepingcode line within a popular line width.
set colorcolumn=80

set ttyfast " fast rendering

set clipboard=unnamed " copy to os clipboard, not to vim clipboard"

let g:ale_completion_enabled = 1
let g:ale_kotlin_languageserver_executable='/opt/homebrew/Cellar/kotlin-language-server/1.3.9/bin/kotlin-language-server'

" Auto-installing of vim-plug
let data_dir = has('nvim') ? stdpath('data') . '/site' : '~/.vim'
if empty(glob(data_dir . '/autoload/plug.vim'))
  silent execute '!curl -fLo '.data_dir.'/autoload/plug.vim --create-dirs  https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim'
  autocmd VimEnter * PlugInstall --sync | source $MYVIMRC
endif

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

Plug 'rust-lang/rust.vim'
Plug 'neoclide/coc.nvim', {'branch': 'release'}
Plug 'dense-analysis/ale'
Plug 'preservim/nerdtree'|
    \ Plug 'Xuyuanp/nerdtree-git-plugin'|
    \ Plug 'ryanoasis/vim-devicons'
Plug 'sheerun/vim-polyglot'
Plug 'udalov/kotlin-vim'
Plug 'nightsense/stellarized'
Plug 'ghifarit53/tokyonight-vim'
Plug 'jiangmiao/auto-pairs'
Plug 'tpope/vim-fugitive'
Plug 'hdiniz/vim-gradle'
"Plug 'davidhalter/jedi-vim'

call plug#end()

" Color theme settings
set background=dark
set termguicolors
colorscheme tokyonight
"let g:lightline = { 'colorscheme': 'stellarized_dark' }

" Coc config
inoremap <silent><expr> <TAB>
      \ coc#pum#visible() ? coc#pum#next(1) :
      \ CheckBackspace() ? "\<Tab>" :
      \ coc#refresh()
inoremap <expr><S-TAB> coc#pum#visible() ? coc#pum#prev(1) : "\<C-h>"

inoremap <silent><expr> <CR> coc#pum#visible() ? coc#pum#confirm()
                              \: "<CR>"

function! CheckBackspace() abort
  let col = col('.') - 1
  return !col || getline('.')[col - 1]  =~# '\s'
endfunction

if has('nvim')
  inoremap <silent><expr> <c-space> coc#refresh()
else
  inoremap <silent><expr> <c-@> coc#refresh()
endif

nmap <silent> gd <Plug>(coc-definition)
nmap <silent> gy <Plug>(coc-type-definition)
nmap <silent> gi <Plug>(coc-implementation)
nmap <silent> gr <Plug>(coc-references)

" Use K to show documentation in preview window
nnoremap <silent> K :call ShowDocumentation()<CR>

function! ShowDocumentation()
  if CocAction('hasProvider', 'hover')
    call CocActionAsync('doHover')
  else
    call feedkeys('K', 'in')
  endif
endfunction

" Highlight the symbol and its references when holding the cursor
autocmd CursorHold * silent call CocActionAsync('highlight')

" Symbol renaming
nmap <leader>rn <Plug>(coc-rename)

" Formatting selected code
xmap <leader>f  <Plug>(coc-format-selected)
nmap <leader>f  <Plug>(coc-format-selected)

" Jedi-vim config
let g:jedi#use_splits_not_buffers = "right"
let g:jedi#environment_path = "venv"

" NERDTree config
nnoremap <leader>n :NERDTreeFocus<CR>
nnoremap <C-n> :NERDTree<CR>
nnoremap <C-t> :NERDTreeToggle<CR>
nnoremap <C-f> :NERDTreeFind<CR>
let NERDTreeShowHidden=1      " Show hidden files in NerdTree
let NERDTreeCascadeSingleChildDir=0 " Remove one-child dirs collapsing

" Simple split navigation
nnoremap <C-J> <C-W><C-J>
nnoremap <C-K> <C-W><C-K>
nnoremap <C-L> <C-W><C-L>
nnoremap <C-H> <C-W><C-H>

" Open new vertical split to the right from current window
set splitright
" Open new horizontal split to the bottom from current window
set splitbelow

inoremap jj <esc>        " fast esc on double-tap j key
noremap ,, :tabp<ENTER>  " go to previous tab window
noremap .. :tabn<ENTER>  " go to next tab window

au FocusLost User :wa " write buffer on focus lost"

" rustfmt settings
let g:rustfmt_autosave = 1
let g:rustfmt_emit_files = 1
let g:rustfmt_fail_silently = 0