let $MYPLUGDIRECTORY = "~/.config/nvim/plugged/"

"plugins
call plug#begin($MYPLUGDIRECTORY)

Plug 'scrooloose/nerdtree'                      " file tree
Plug 'luochen1990/rainbow'                      " rainbow colored parenthesis and brakets
Plug 'itchyny/lightline.vim'                    " statusline
Plug 'preservim/nerdcommenter'                  " easier comment management
Plug 'neoclide/coc.nvim', {'branch': 'release'} " code completion
Plug 'jiangmiao/auto-pairs'                     " automatic pairs
Plug 'machakann/vim-sandwich'                   " manipulate elements surrounding other elements
Plug 'airblade/vim-gitgutter'                   " show git changes
Plug 'vim-scripts/colorizer'                    " colorize color codes
Plug 'honza/vim-snippets'                       " snippets
Plug 'lervag/vimtex'                            " vimtex

call plug#end()

" coc plugins
let g:coc_global_extensions = ['coc-snippets', 'coc-git', 'coc-vimtex']

"neovim-remote for vimtex
let g:vimtex_compiler_progname = 'nvr'

"vimtex
let g:vimtex_view_method = 'zathura'

" lightline
set laststatus=2

"NERDTree
autocmd StdinReadPre * let s:std_in=1
autocmd VimEnter * if argc() == 0 && !exists("s:std_in") | NERDTree | endif
autocmd VimEnter * if argc() == 1 && isdirectory(argv()[0]) && !exists("s:std_in") | exe 'NERDTree' argv()[0] | wincmd p | ene | exe 'cd '.argv()[0] | endif
autocmd bufenter * if (winnr("$") == 1 && exists("b:NERDTree") && b:NERDTree.isTabTree()) | q | endif

set nocompatible            " disable compatibility to old-time vi
set showmatch               " show matching brackets.
set mouse=v                 " middle-click paste with mouse
set hlsearch                " highlight search results
set tabstop=4               " number of columns occupied by a tab character
set softtabstop=4           " see multiple spaces as tabstops so <BS> does the right thing
set expandtab               " converts tabs to white space
set shiftwidth=4            " width for autoindents
set autoindent              " indent a new line the same amount as the line just typed
set wildmode=longest,list   " get bash-like tab completions
filetype plugin indent on   " allows auto-indenting depending on file type
syntax on                   " syntax highlighting
let mapleader=" "           " set mapleader to space
let maplocalleader=" "      " set localleader to space
set timeoutlen=1000         " set timeout length

"colors
colorscheme default
"extra specified colors
highlight ColorColumn ctermbg=8
highlight clear SignColumn
highlight GitGutterAdd ctermfg=2
highlight GitGutterChange ctermfg=3
highlight GitGutterDelete ctermfg=1
highlight LineNr ctermfg=7
highlight CursorLineNr ctermfg=7

set cc=80                   " set an 80 column border for good coding style
"toggle cc when reasonable
augroup cctoggle
    autocmd!
    autocmd BufEnter,FocusGained    * set cc=80
    autocmd BufLeave,FocusLost      * set cc=0
augroup END

"toggle relativenumber when reasonable
set number relativenumber
augroup numbertoggle
    autocmd!
    autocmd BufEnter,FocusGained,InsertLeave    * set relativenumber
    autocmd BufLeave,FocusLost,InsertEnter      * set norelativenumber
augroup END
"gitgutter update speed
set updatetime=100

"gitgutter signs
let g:gitgutter_sign_added = '+'
let g:gitgutter_sign_modified = '~'
let g:gitgutter_sign_removed = '-'
let g:gitgutter_sign_removed_first_line = '^'

"--------------------
"mappings
"--------------------
"custom window ommands
nnoremap <leader>wv <C-W>v
nnoremap <leader>ws <C-W>s
nnoremap <leader>wc <C-W>c
nnoremap <leader>wo <C-W>o
nnoremap <C-h> <C-W>h
nnoremap <C-l> <C-W>l
nnoremap <C-j> <C-W>j
nnoremap <C-k> <C-W>k
nnoremap öw :w<CR>
nnoremap öq :q<CR>
"custom tab commands
nnoremap <leader>tn :tabnew<space>
"show buffers
nnoremap <Leader>b :buffers<CR>:buffer<Space>
"reload settings
nnoremap <leader>rl :source ~/.config/nvim/init.vim<CR>
"NERDTree commands
nnoremap <leader>nt :NERDTreeToggle<CR>
nnoremap <leader>f :NERDTreeFind<CR>
"symbol renaming
nnoremap <leader>rn <Plug>(coc-reame)
" use <tab> for trigger completion and navigate to the next complete item
function! s:check_back_space() abort
  let col = col('.')- 1
  return !col || getline('.')[col - 1]  =~ '\s'
endfunction

" Make <tab> used for trigger completion, completion confirm, snippet expand and jump like VSCode.
inoremap <silent><expr> <TAB>
      \ pumvisible() ? coc#_select_confirm() :
      \ coc#expandableOrJumpable() ? "\<C-r>=coc#rpc#request('doKeymap', ['snippets-expand-jump',''])\<CR>" :
      \ <SID>check_back_space() ? "\<TAB>" :
      \ coc#refresh()

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

let g:coc_snippet_next = '<tab>'