" init the plugins
" (<--- left pannel) wait for 'PlugInstall' command
" please quit vim after 'PlugInstall' command
" autocmd VimEnter * :PlugInstall


map <F3> :NERDTreeMirror<CR>
map <F3> :NERDTreeToggle<CR>
map <F5> :term<CR>

set previewwindow

set number
set ruler
set showcmd
set notimeout

set mouse=a
set clipboard=unnamed
set cursorline

set tabstop=4
set softtabstop=4
set shiftwidth=4
set expandtab

set cindent
set smartindent

set showmatch
set matchtime=5

" ==== plugin manager ====
call plug#begin('~/.vim/plugged')
  Plug 'itchyny/lightline.vim'
  Plug 'preservim/nerdtree'
  Plug 'luochen1990/rainbow'
  Plug 'mhinz/vim-startify'
  Plug 'preservim/nerdcommenter'
  Plug 'liuchengxu/space-vim-theme'
  Plug 'morhetz/gruvbox'
  " lsp
  Plug 'neoclide/coc.nvim'
call plug#end()


" ==== preservim/nerdcommenter ====
let g:NERDSpaceDelims = 1
let g:NERDCompactSexyComs = 1
let g:NERDDefaultAlign = 'left'
let g:NERDToogleCheckAllLines = 1

" ==== preservim/nerdtree ====
nnoremap <LEADER>e :NERDTreeToggle<CR>
" 当NERDTree为剩下的唯一窗口时自动关闭
" autocmd vimenter * if (winnr("$") == 1 && exists("b:NERDTree") && b:NERDTree.isTabTree()) | q |endif

" ==== itchyny/lightline.vim ====
set laststatus=2
if !has('gui_running')
    set t_Co=256
endif
" -- INSERT -- is unnecessary anymore because the mode infomation is displayed
"  in the statusline.
set noshowmode

" ==== luochen1990/rainbow ====
let g:rainbow_active = 0

" ==== neoclide/coc.nvim ====

" coc extensions
let g:coc_global_extensions = [
      \ 'coc-json',
      \ 'coc-tsserver',
      \ 'coc-css',
      \ 'coc-html',
      \ 'coc-vimlsp',
      \ 'coc-clangd',
      \ 'coc-highlight',
      \ 'coc-pyright',
      \ 'coc-pairs',
      \ 'coc-markdownlint'
      \ ]

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()

" <CR> to comfirm selected candidate
" only when there's selected complete item
if exists('*complete_info')
  inoremap <silent><expr> <CR> complete_info(['selected'])['selected'] != -1 ? "\<C-y>" : "\<C-g>u\<CR>"
endif

" 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>')
  else
    call CocAction('doHover')
  endif
endfunction

" Highlight symbol under cursor on CursorHold
autocmd CursorHold * silent call CocActionAsync('highlight')

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

" Remap for format selected region
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


" GoTo code navigation.
nmap <silent> gd <Plug>(coc-definition)
nmap <silent> gD :tab sp<CR><Plug>(coc-definition)
nmap <silent> gy <Plug>(coc-type-definition)
nmap <silent> gi <Plug>(coc-implementation)
nmap <silent> gr <Plug>(coc-references)

function! s:generate_compile_commands()
  if empty(glob('CMakeLists.txt'))
    echo "Can't find CMakeLists.txt"
    return
  endif
  if empty(glob('.vscode'))
    execute 'silent !mkdir .vscode'
  endif
  execute '!cmake -DCMAKE_BUILD_TYPE=debug
      \ -DCMAKE_EXPORT_COMPILE_COMMANDS=1 -S . -B .vscode'
endfunction
command! -nargs=0 Gcmake :call s:generate_compile_commands()

" ==== puremourning/vimspector ====
let g:vimspector_enable_mappings = 'HUMAN'

function! s:generate_vimspector_conf()
  if empty(glob( '.vimspector.json' ))
    if &filetype == 'c' || 'cpp' 
      !cp ~/.config/nvim/vimspector_conf/c.json ./.vimspector.json
    elseif &filetype == 'python'
      !cp ~/.config/nvim/vimspector_conf/python.json ./.vimspector.json
    endif
  endif
  e .vimspector.json
endfunction



" C and C++ compiler:
"autocmd FileType c nnoremap <buffer> <C-i> :w <RETURN> :!gcc % -o main -g && ./main <RETURN>
"autocmd FileType cpp nnoremap <buffer> <C-i> :w <RETURN> :!g++ % -o main -g && ./main <RETURN>

" Python runner:
autocmd FileType python nnoremap <buffer> <C-i> :w <RETURN> :!python % <RETURN>

filetype plugin on
set completeopt=longest,menu

colorscheme gruvbox
set background=dark