vimrc

syntax on

set relativenumber
set hlsearch
set noerrorbells
set tabstop=4 softtabstop=4
set shiftwidth=4
set expandtab
set smartindent
set nu
set nowrap
set smartcase
set noswapfile
set nobackup
set undodir=~/.vim/undodir
set undofile
set incsearch

set colorcolumn=88
highlight ColorColumn ctermbg=0 guibg=lightgrey

set scrolloff=8

let g:coc_disable_startup_warning = 1

" download plugged if not available
if empty(glob('~/.vim/autoload/plug.vim'))
  silent !curl -fLo ~/.vim/autoload/plug.vim --create-dirs
    \ https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim
  autocmd VimEnter * PlugInstall --sync | source $MYVIMRC
endif

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

Plug 'morhetz/gruvbox'
Plug 'jremmen/vim-ripgrep'
Plug 'tpope/vim-fugitive'
Plug 'vim-utils/vim-man'
Plug 'mbbill/undotree'
Plug 'vim-airline/vim-airline'
if v:version > 709
    Plug 'junegunn/fzf', { 'do': { -> fzf#install() } }
    Plug 'junegunn/fzf.vim'
    Plug 'neoclide/coc.nvim', {'branch': 'release'}
endif

call plug#end()
" Plug 'lyuts/vim-rtags' " this is not in at the moment becuase it complains
" about python support, see https://vi.stackexchange.com/questions/18433/installing-or-building-vim-with-python3-support-for-python-3-7-x-on-linux

" highlight whitespace:
set list           " Display unprintable characters f12 - switches
set listchars=tab:•\ ,trail:•,extends:»,precedes:« " Unprintable chars mapping

inoremap <silent><expr> <TAB>
      \ pumvisible() ? "\<C-n>" :
      \ <SID>check_back_space() ? "\<TAB>" :
      \ coc#refresh()
inoremap <expr><S-TAB> pumvisible() ? "\<C-p>" : "\<C-h>"

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

" Having longer updatetime (default is 4000 ms = 4 s) leads to noticeable
" delays and poor user experience.
set updatetime=50

" coc remaps
nmap <leader>gd <Plug>(coc-definition)
nmap <leader>gr <Plug>(coc-references)
nmap <leader>rr <Plug>(coc-rename)

nmap <leader>gy <Plug>(coc-type-definition)
nmap <leader>gi <Plug>(coc-implementation)
nmap <leader>g[ <Plug>(coc-diagnostic-prev)
nmap <leader>g] <Plug>(coc-diagnostic-next)
nmap <silent> <leader>gp <Plug>(coc-diagnostic-prev-error)
nmap <silent> <leader>gn <Plug>(coc-diagnostic-next-error)
nnoremap <leader>cr :CocRestart
nnoremap <leader>prw :CocSearch <C-R>=expand("<cword>")<CR><CR>
nnoremap <leader>cp :CocCommand python.setInterpreter<CR>

" Use <cr> to confirm completion, `<C-g>u` means break undo chain at current
" position. Coc only does snippet and additional edit on confirm.
" <cr> could be remapped by other vim plugin, try `:verbose imap <CR>`.
if exists('*complete_info')
  inoremap <expr> <cr> complete_info()["selected"] != "-1" ? "\<C-y>" : "\<C-g>u\<CR>"
else
  inoremap <expr> <cr> pumvisible() ? "\<C-y>" : "\<C-g>u\<CR>"
endif

" Sweet Sweet FuGITive
nmap <leader>gj :diffget //3<CR>
nmap <leader>gf :diffget //2<CR>
nmap <leader>gs :G<CR>

" misc remaps
nnoremap <leader>pw :Rg <C-R>=expand("<cword>")<CR><CR>
nnoremap <leader>phw :h <C-R>=expand("<cword>")<CR><CR>
nnoremap <leader>h :wincmd h<CR>
nnoremap <leader>j :wincmd j<CR>
nnoremap <leader>k :wincmd k<CR>
nnoremap <leader>l :wincmd l<CR>
nnoremap <leader>u :UndotreeShow<CR>
nnoremap <leader>pv :wincmd v<bar> :Ex <bar> :vertical resize 30<CR>
nnoremap <Leader>ps :Rg<SPACE>
nnoremap <C-p> :GFiles<CR>
nnoremap <Leader>pf :Files<CR>
nnoremap <Leader>+ :vertical resize +5<CR>
nnoremap <Leader>- :vertical resize -5<CR>
nnoremap <Leader>rp :resize 100<CR>
vnoremap J :m '>+1<CR>gv=gv
vnoremap K :m '<-2<CR>gv=gv
noremap <leader>\t :below terminal<CR>
nnoremap <Leader>b :ls<CR>:b<Space>

" increase sizes of <C-e> and <C-y> scrolling
noremap <C-e> 7<C-e>
noremap <C-y> 7<C-y>

" tab replacement and whitespace removal shortcuts
nnoremap <leader>t :%s/\t/    /g<CR>
nnoremap <leader>w :%s/\s\+$//e<CR>

" simple copying and pasting twixt vims
vmap <leader>y :w! /tmp/vitmp<CR>
nmap <leader>p :r! cat /tmp/vitmp<CR>

" allow unsaved buffers to be abandoned
set hidden
set confirm

" make backspace work as it does in the rest of the world
set backspace=indent,eol,start

function! BnSkipTerm()
  let start_buffer = bufnr('%')
  bn
  while &buftype ==# 'terminal' && bufnr('%') != start_buffer
    bn
  endwhile
endfunction

function! BpSkipTerm()
  let start_buffer = bufnr('%')
  bp
  while &buftype ==# 'terminal' && bufnr('%') != start_buffer
    bp
  endwhile
endfunction

nnoremap <leader>] :call BnSkipTerm()<CR>
nnoremap <leader>[ :call BpSkipTerm()<CR>

"colour scheme
colorscheme gruvbox
set background=dark

let g:airline_powerline_fonts = 1
set guifont=Inconsolata\ for\ Powerline:h15
let g:Powerline_symbols = 'fancy'
set encoding=utf-8
if !exists('g:airline_symbols')
            let g:airline_symbols = {}
    endif
      " unicode symbols
      let g:airline_left_sep = '»'
      let g:airline_left_sep = '▶'
      let g:airline_right_sep = '«'
      let g:airline_right_sep = '◀'
      let g:airline_symbols.linenr = '␊'
      let g:airline_symbols.linenr = '␤'
      let g:airline_symbols.linenr = '¶'
      let g:airline_symbols.branch = '⎇'
      let g:airline_symbols.paste = 'ρ'
      let g:airline_symbols.paste = 'Þ'
      let g:airline_symbols.paste = '∥'
      let g:airline_symbols.whitespace = 'Ξ'

      " airline symbols
      let g:airline_left_sep = ''
      let g:airline_left_alt_sep = ''
      let g:airline_right_sep = ''
      let g:airline_right_alt_sep = ''
      let g:airline_symbols.branch = ''
      let g:airline_symbols.readonly = ''
      let g:airline_symbols.linenr = ''