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

Plug 'itchyny/lightline.vim'
Plug 'sonph/onehalf', { 'rtp': 'vim' }

Plug 'tpope/vim-fugitive'

Plug 'NLKNguyen/papercolor-theme'
Plug 'fatih/vim-go'
Plug 'neoclide/coc.nvim', {'branch': 'master', 'do': 'yarn install --frozen-lockfile'}

" polyglot
Plug 'sheerun/vim-polyglot'

" Typescript lsp
Plug 'neoclide/coc-tsserver'

" treesitter
Plug 'nvim-treesitter/nvim-treesitter', {'do': ':TSUpdate'}

" FZF integration with vim
Plug 'junegunn/fzf', { 'do': { -> fzf#install() } }
Plug 'junegunn/fzf.vim'

call plug#end()

" colors
"
set t_Co=256 "required for urxvt
set background=dark "dark or light
" colorscheme PaperColor

let g:lightline = {
	\ 'colorscheme': 'onehalfdark',
	\ 'active': {
	\   'left': [ [ 'mode', 'paste' ],
	\             [ 'gitbranch', 'readonly', 'filename', 'modified' ] ]
	\ },
	\ 'component_function': {
	\   'gitbranch': 'FugitiveHead'
	\ },
	\ }
" Hide insert(redundant because of lightline plugin)
set noshowmode

" Clear the background in order to have opacity
hi Normal guibg=NONE ctermbg=NONE
hi clear SignColumn
hi clear LineNr

" settings
"
filetype on "detect files based on type
filetype plugin on "when a file is edited its plugin file is loaded
filetype indent on "maintain indentention
set nu "enable line numbers
set relativenumber "relative line numbers
set colorcolumn=100 "display a colored column at 100 chars
highlight ColorColumn ctermbg=0 guibg=morning

" -------------------------------------------------------------------------------------------------
"  treesitter settings
"
" -------------------------------------------------------------------------------------------------

" Syntax highlighting
lua <<EOF
require'nvim-treesitter.configs'.setup {
  highlight = {
    enable = true,
    custom_captures = {
      -- Highlight the @foo.bar capture group with the "Identifier" highlight group.
      ["foo.bar"] = "Identifier",
    },
  },
}
EOF

" Incrementals selection
lua <<EOF
require'nvim-treesitter.configs'.setup {
  incremental_selection = {
    enable = true,
    keymaps = {
      init_selection = "gnn",
      node_incremental = "grn",
      scope_incremental = "grc",
      node_decremental = "grm",
    },
  },
}
EOF

" Indentation
lua <<EOF
require'nvim-treesitter.configs'.setup {
  indent = {
    enable = true
  }
}
EOF

" Folding
set foldmethod=expr
set foldexpr=nvim_treesitter#foldexpr()

" -------------------------------------------------------------------------------------------------
" coc.nvim default settings
"
" -------------------------------------------------------------------------------------------------

" if hidden is not set, TextEdit might fail.
set hidden
" Better display for messages
set cmdheight=2
" Smaller updatetime for CursorHold & CursorHoldI
set updatetime=300
" don't give |ins-completion-menu| messages.
set shortmess+=c
" always show signcolumns
set signcolumn=yes

" Use tab for trigger completion with characters ahead and navigate.
" Use command ':verbose imap <tab>' to make sure tab is not mapped by other plugin.
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.
inoremap <silent><expr> <c-space> coc#refresh()

" Use `[c` and `]c` to navigate diagnostics
nmap <silent> [c <Plug>(coc-diagnostic-prev)
nmap <silent> ]c <Plug>(coc-diagnostic-next)

" Remap keys for gotos
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 U to show documentation in preview window
nnoremap <silent> U :call <SID>show_documentation()<CR>

" Remap for rename current word
nmap <leader>rn <Plug>(coc-rename)

" Remap for format selected region
vmap <leader>f  <Plug>(coc-format-selected)
nmap <leader>f  <Plug>(coc-format-selected)
" Show all diagnostics
nnoremap <silent> <space>a  :<C-u>CocList diagnostics<cr>
" Manage extensions
nnoremap <silent> <space>e  :<C-u>CocList extensions<cr>
" Show commands
nnoremap <silent> <space>c  :<C-u>CocList commands<cr>
" Find symbol of current document
nnoremap <silent> <space>o  :<C-u>CocList outline<cr>
" Search workspace symbols
nnoremap <silent> <space>s  :<C-u>CocList -I symbols<cr>
" Do default action for next item.
nnoremap <silent> <space>j  :<C-u>CocNext<CR>
" Do default action for previous item.
nnoremap <silent> <space>k  :<C-u>CocPrev<CR>
" Resume latest coc list
nnoremap <silent> <space>p  :<C-u>CocListResume<CR>

" disable vim-go :GoDef short cut (gd)
" this is handled by LanguageClient [LC]
let g:go_def_mapping_enabled = 0

" Explorer
nmap <space>e :CocCommand explorer<CR>
nmap <space>f :CocCommand explorer --preset floating<CR>
autocmd BufEnter * if (winnr("$") == 1 && &filetype == 'coc-explorer') | q | endif

" Prettier
command! -nargs=0 Prettier :CocCommand prettier.formatFile