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

    Plug 'joshdick/onedark.vim'                        " Colors
    Plug 'itchyny/lightline.vim'                       " Lightline statusbar
    Plug 'scrooloose/nerdtree'                         " Nerdtree
    Plug 'tiagofumo/vim-nerdtree-syntax-highlight'     " Highlighting Nerdtree
    Plug 'ryanoasis/vim-devicons'                      " Icons for Nerdtree
    Plug 'ap/vim-css-color'                            " Color previews for CSS
    Plug 'junegunn/limelight.vim'
    Plug 'junegunn/fzf.vim'
    Plug 'xolox/vim-misc'
    Plug 'xolox/vim-session'
    Plug 'neoclide/coc.nvim', {'branch': 'release'}
    Plug 'mfussenegger/nvim-dap'
    Plug 'rcarriga/nvim-dap-ui'
    Plug 'jackguo380/vim-lsp-cxx-highlight'
    Plug 'vim-syntastic/syntastic'
    Plug 'rhysd/vim-clang-format'
    Plug 'lambdalisue/suda.vim'
call plug#end()

" for transparent background
function! AdaptColorscheme()
   highlight clear CursorLine
   highlight Normal ctermbg=none
   highlight LineNr ctermbg=none
   highlight Folded ctermbg=none
   highlight NonText ctermbg=none
   highlight SpecialKey ctermbg=none
   highlight VertSplit ctermbg=none
   highlight SignColumn ctermbg=none
endfunction

autocmd ColorScheme * call AdaptColorscheme()


set cursorline

" colorscheme
syntax on

" brackets
inoremap " ""<left>
inoremap ' ''<left>
inoremap ( ()<left>
inoremap [ []<left>
inoremap { {}<left>
inoremap {<CR> {<CR>}<ESC>O
inoremap {;<CR> {<CR>};<ESC>O

filetype plugin on
let g:instant_markdown_browser = "firefox --new-window"

let g:session_autosave = "no"
let g:session_autoload = "no"

" Make Vim more useful
set nocompatible
" Long lines as one line
set nowrap
" Ruler
set ruler
" Horizontal splits will automatically be below
set splitbelow
" Vertical splits will automatically be to the right
set splitright
" Indent
set smartindent
set autoindent
" Use the OS clipboard by default (on versions compiled with `+clipboard`)
set clipboard+=unnamedplus
" Enhance command-line completion
set wildmenu
" Disables automatic commenting on newline:
autocmd FileType * setlocal formatoptions-=c formatoptions-=r formatoptions-=o
" Allow cursor keys in insert mode
" Allow backspace in insert mode
set backspace=indent,eol,start
" Optimize for fast terminal connections
set ttyfast
" Add the g flag to search/replace by default
set gdefault
" Use UTF-8 without BOM
set encoding=utf-8 
" Change mapleader
let mapleader=","
" Don’t add empty newlines at the end of files
set binary
set noeol
set smartcase
set noswapfile
set nobackup
set undodir=~/.vim/undodir
set undofile

" 256 colors
set t_Co=256 
" Respect modeline in files
set modeline
set modelines=4
" Enable per-directory .vimrc files and disable unsafe commands in them
set exrc
set secure
" Enable line numbers
set number
" Make tabs as wide as two spaces
set tabstop=4
set shiftwidth=4
set smarttab
set expandtab
" Highlight searches
set hlsearch
" Ignore case of searches
set ignorecase
" Highlight dynamically as pattern is typed
set incsearch
" Always show status line
set laststatus=2
" Enable mouse in all modes
set mouse=a
" Disable error bells
set noerrorbells
" Don’t reset cursor to start of line when moving around.
set nostartofline
" Show the cursor position
set ruler
" Don’t show the intro message when starting Vim
set shortmess=atI
" Show the current mode
set showmode
" Show the filename in the window titlebar
set title
" Show the (partial) command as it’s being typed
set showcmd
" Use relative line numbers

set hidden
set nobackup
set nowritebackup
set updatetime=300
set shortmess+=c

" Give more space for displaying messages.
set cmdheight=2
set pumheight=5

" Always show the signcolumn, otherwise it would shift the text each time
" diagnostics appear/become resolved.
if has("nvim-0.5.0") || has("patch-8.1.1564")
    " Recently vim can merge signcolumn and number column into one
    set signcolumn=number
else
    set signcolumn=yes
endif

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

" Use <c-space> to trigger completion.
if has('nvim')
  inoremap <silent><expr> <c-return> coc#refresh()
else
  inoremap <silent><expr> <c-@> coc#refresh()
endif

" Make <CR> auto-select the first completion item and notify coc.nvim to
" format on enter, <cr> could be remapped by other vim plugin
inoremap <silent><expr> <cr> pumvisible() ? coc#_select_confirm()
                              \: "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"

" 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)

" 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 K to show documentation in preview window.
nnoremap <silent> K :call <SID>show_documentation()<CR>

function! s:show_documentation()
  if (index(['vim','help'], &filetype) >= 0)
    execute 'h '.expand('<cword>')
  elseif (coc#rpc#ready())
    call CocActionAsync('doHover')
  else
    execute '!' . &keywordprg . " " . expand('<cword>')
  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)

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 codeAction to the selected region.
" Example: `<leader>aap` for current paragraph
xmap <leader>a  <Plug>(coc-codeaction-selected)
nmap <leader>a  <Plug>(coc-codeaction-selected)

" Remap keys for applying codeAction to the current buffer.
nmap <leader>ac  <Plug>(coc-codeaction)
" Apply AutoFix to problem on the current line.
nmap <leader>qf  <Plug>(coc-fix-current)

" Run the Code Lens action on the current line.
nmap <leader>cl  <Plug>(coc-codelens-action)

" Remap <C-f> and <C-b> for scroll float windows/popups.
if has('nvim-0.4.0') || has('patch-8.2.0750')
  nnoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
  nnoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
  inoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(1)\<cr>" : "\<Right>"
  inoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(0)\<cr>" : "\<Left>"
  vnoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
  vnoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
endif


" Add `:Format` command to format current buffer.
command! -nargs=0 Format :call CocActionAsync('format')

" Add `:Fold` command to fold current buffer.
command! -nargs=? Fold :call     CocAction('fold', <f-args>)

" Add `:OR` command for organize imports of the current buffer.
command! -nargs=0 OR   :call     CocActionAsync('runCommand', 'editor.action.organizeImport')

let g:lightline = {
	\ 'colorscheme': 'onedark',
	\ 'active': {
	\   'left': [ [ 'mode', 'paste' ],
	\             [ 'cocstatus', 'readonly', 'filename', 'modified' ] ]
	\ },
	\ 'component_function': {
	\   'cocstatus': 'coc#status'
	\ },
	\ }

" Use autocmd to force lightline update.
autocmd User CocStatusChange,CocDiagnosticChange call lightline#update()

" Mappings for CoCList
" Show all diagnostics.
nnoremap <silent><nowait> <space>a  :<C-u>CocList diagnostics<cr>
" Manage extensions.
nnoremap <silent><nowait> <space>e  :<C-u>CocList extensions<cr>
" Show commands.
nnoremap <silent><nowait> <space>c  :<C-u>CocList commands<cr>
" Find symbol of current document.
nnoremap <silent><nowait> <space>o  :<C-u>CocList outline<cr>
" Search workspace symbols.
nnoremap <silent><nowait> <space>s  :<C-u>CocList -I symbols<cr>
" Do default action for next item.
nnoremap <silent><nowait> <space>j  :<C-u>CocNext<CR>
" Do default action for previous item.
nnoremap <silent><nowait> <space>k  :<C-u>CocPrev<CR>
" Resume latest coc list.
nnoremap <silent><nowait> <space>p  :<C-u>CocListResume<CR>

" c++ syntax highlighting
let g:cpp_class_scope_highlight = 1
let g:cpp_member_variable_highlight = 1
let g:cpp_class_decl_highlight = 1

" c++ linting
let g:syntastic_cpp_checkers = ['cpplint']
let g:syntastic_c_checkers = ['cpplint']
let g:syntastic_cpp_cpplint_exec = 'cpplint'
" The following two lines are optional. Configure it to your liking!
let g:syntastic_check_on_open = 1
let g:syntastic_check_on_wq = 0

nnoremap <Leader>f :<C-u>ClangFormat<CR>

" header guards
function! s:insert_gates()
  let gatename = substitute(toupper(expand("%:t")), "\\.", "_", "g")
  execute "normal! i#ifndef " . gatename
  execute "normal! o#define " . gatename . " "
  execute "normal! Go#endif /* " . gatename . " */"
  normal! ko
endfunction
autocmd BufNewFile *.{h,hpp} call <SID>insert_gates()

if exists("&relativenumber")
	set relativenumber
	au BufReadPost * set relativenumber
endif " Start scrolling three lines before the horizontal window border
set scrolloff=3

" Toggle spellchecking
function! ToggleSpellCheck()
  set spell!
  if &spell
    echo "Spellcheck ON"
  else
    echo "Spellcheck OFF"
  endif
endfunction


" Better tabbing
vnoremap < <gv
vnoremap > >gv

" Better window navigation
nnoremap <C-h> <C-w>h
nnoremap <C-j> <C-w>j
nnoremap <C-k> <C-w>k
nnoremap <C-l> <C-w>l

map <Leader>c :w! \| !make <CR>
map <Leader>r <c-w>v <c-w>l :terminal ./run.sh <c-r>% <CR>a
map <Leader>t :!st&<CR><CR>
map <Leader>o :FZF<CR>
map <Leader>s :call ToggleSpellCheck()<CR>
map <Leader>n :NERDTreeToggle<CR>
map Q gq
" Insert mode completion
imap <c-x><c-k> <plug>(fzf-complete-word)
imap <c-x><c-f> <plug>(fzf-complete-path)
imap <c-x><c-l> <plug>(fzf-complete-line)
vnoremap <C-c> "+y

" Write as root
cnoremap w!! SudaWrite

colorscheme onedark

" Debugging
map <Leader>db :lua require'dap'.toggle_breakpoint() <CR>
map <Leader>dc :lua require'dap'.continue() <CR>
map <Leader>do :lua require'dap'.step_over() <CR>
map <Leader>di :lua require'dap'.step_into() <CR>
map <Leader>dn :lua require("dapui").toggle() <CR>
lua require("dap-conf")
lua require("dapui").setup()