.vimrc

set nocompatible

" Vim-Plug init
call plug#begin('~/.vim/plugged')
  Plug 'neoclide/coc.nvim', {'branch': 'release'} |
  Plug 'altercation/vim-colors-solarized' |
  Plug 'morhetz/gruvbox' |
  Plug 'vim-airline/vim-airline' |
  Plug 'vim-airline/vim-airline-themes' |
  Plug 'dense-analysis/ale' |
  Plug 'tmhedberg/SimpylFold' |
  Plug 'junegunn/fzf', { 'do': { -> fzf#install() } } |
  Plug 'junegunn/fzf.vim' |
  Plug 'fatih/vim-go'
call plug#end()

" Vim Airline
let g:airline#extensions#tabline#enabled = 1
let g:airline#extensions#tabline#formatter = 'unique_tail_improved'

" Vim COC

" Having longer updatetime (default is 4000 ms = 4s) leads to noticeable
" delays and poor user experience
set updatetime=300

" Always show the signcolumn, otherwise it would shift the text each time
" diagnostics appear/become resolved
set signcolumn=yes

" Use tab for trigger completion with characters ahead and navigate
" NOTE: There's always complete item selected by default, you may want to enable
" no select by `"suggest.noselect": true` in your configuration file
" NOTE: Use command ':verbose imap <tab>' to make sure tab is not mapped by
" other plugin before putting this into your 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>"

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

" Make <CR> to accept selected completion item or notify coc.nvim to format
" <C-g>u breaks current undo, please make your own choice
inoremap <silent><expr> <CR> coc#pum#visible() ? coc#pum#confirm()
                              \: "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"

inoremap <silent><expr> <c-p> coc#refresh()

" GoTo code navigation
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 `[g` and `]g` to navigate diagnostics
" Use `:CocDiagnostics` to get all diagnostics of current buffer in location list
nmap <silent> [g <Plug>(coc-diagnostic-prev)
nmap <silent> ]g <Plug>(coc-diagnostic-next)

" 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

" Vim SimpylFold
let g:SimpylFold_docstring_preview = 1

" 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>rf  <Plug>(coc-format-selected)
nmap <leader>rf  <Plug>(coc-format-selected)

augroup mygroup
  autocmd!
  " Setup formatexpr specified filetype(s)
  autocmd FileType typescript,json setl formatexpr=CocAction('formatSelected')
  " Update signature help on jump placeholder
  autocmd User CocJumpPlaceholder call CocActionAsync('showSignatureHelp')
augroup end

" Applying code actions to the selected code block
" Example: `<leader>aap` for current paragraph
xmap <leader>a  <Plug>(coc-codeaction-selected)
nmap <leader>a  <Plug>(coc-codeaction-selected)

" Remap keys for applying code actions at the cursor position
nmap <leader>ac  <Plug>(coc-codeaction-cursor)
" Remap keys for apply code actions affect whole buffer
nmap <leader>as  <Plug>(coc-codeaction-source)
" Apply the most preferred quickfix action to fix diagnostic on the current line
nmap <leader>qf  <Plug>(coc-fix-current)

" PLUGIN: FZF
nnoremap <silent> <Leader>b :Buffers<CR>
nnoremap <silent> <C-f> :Files<CR>
nnoremap <silent> <Leader>f :Rg<CR>
nnoremap <silent> <Leader>/ :BLines<CR>
nnoremap <silent> <Leader>' :Marks<CR>
nnoremap <silent> <Leader>g :Commits<CR>
nnoremap <silent> <Leader>H :Helptags<CR>
nnoremap <silent> <Leader>hh :History<CR>
nnoremap <silent> <Leader>h: :History:<CR>
nnoremap <silent> <Leader>h/ :History/<CR>


" Set the color scheme
syntax on
set background=dark
colorscheme gruvbox

" Python folding
set foldmethod=indent
nnoremap <space> za
vnoremap <space> zf

" Basic stuff
set encoding=UTF-8
set history=100
set autoread
set hidden

" Swap files
set noswapfile

" Text
set spell

" UI
set title
set number
set ruler
set wildmenu
set cursorline
set mouse=a

" Search
set hlsearch
set incsearch
set ignorecase
set smartcase

" Splits
set splitbelow
set splitright

" Formatting and spaces
set expandtab
set smarttab
set tabstop=4

" Filetypes stuff starts
filetype plugin indent on
filetype off
filetype indent on

" Keybindings
cnoreabbrev E Ex