" key mappings
let mapleader = ","
nmap <Leader>s :update<CR>
nmap <leader>p :set paste!<CR>
nmap <leader>h :set hlsearch!<CR>
nmap <leader>t :wa <bar> :Make test<CR>

" navigate buffers by ctrl-b
nmap <C-b> :bprevious<CR>
nmap <C-B> :bnext<CR>
nmap <leader>d :bd<CR>

nnoremap ; :

" no cheating !
map <up> <nop>
map <down> <nop>
map <left> <nop>
map <right> <nop>

" for damaged keyboards
map <F1> <Esc>
imap <F1> <Esc>

" special chars
nmap <leader>l :set list!<CR>

" tree
map <leader>n :NERDTreeToggle<CR>

" quickfix
nmap <leader>q <Plug>window:quickfix:toggle

" ack
cnoreabbrev Ack Ack!
nnoremap <Leader>/ :Ack!<Space>
nnoremap <silent> [q :cprevious<CR>
nnoremap <silent> ]q :cnext<CR>

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

function! s:show_documentation()
    if (index(['vim','help'], &filetype) >= 0)
        execute 'h '.expand('<cword>')
    else
        call CocAction('doHover')
    endif
endfunction
inoremap <silent><expr> <TAB>
            \ pumvisible() ? "\<C-n>" :
            \ <SID>check_back_space() ? "\<TAB>" :
            \ coc#refresh()
inoremap <expr><S-TAB> pumvisible() ? "\<C-p>" : "\<C-h>"
inoremap <silent><expr> <c-space> coc#refresh()

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

nmap <silent> [g <Plug>(coc-diagnostic-prev)
nmap <silent> ]g <Plug>(coc-diagnostic-next)

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)

nnoremap <silent> K :call <SID>show_documentation()<CR>
nmap <leader>rn <Plug>(coc-rename)
xmap <leader>f  <Plug>(coc-format-selected)
nmap <leader>f  <Plug>(coc-format-selected)
xmap <leader>a  <Plug>(coc-codeaction-selected)
nmap <leader>a  <Plug>(coc-codeaction-selected)

nmap <leader>ac  <Plug>(coc-codeaction)
nmap <leader>qf  <Plug>(coc-fix-current)

xmap if <Plug>(coc-funcobj-i)
xmap af <Plug>(coc-funcobj-a)
omap if <Plug>(coc-funcobj-i)
omap af <Plug>(coc-funcobj-a)

nmap <silent> <TAB> <Plug>(coc-range-select)
xmap <silent> <TAB> <Plug>(coc-range-select)
nnoremap <silent> <space>a  :<C-u>CocList diagnostics<cr>
nnoremap <silent> <space>e  :<C-u>CocList extensions<cr>
nnoremap <silent> <space>c  :<C-u>CocList commands<cr>
nnoremap <silent> <space>o  :<C-u>CocList outline<cr>
nnoremap <silent> <space>s  :<C-u>CocList -I symbols<cr>
nnoremap <silent> <space>j  :<C-u>CocNext<CR>
nnoremap <silent> <space>k  :<C-u>CocPrev<CR>
nnoremap <silent> <space>p  :<C-u>CocListResume<CR>