init.vim

"=============== Basic Functions ================
function! CmdLine(str)
    call feedkeys(":" . a:str)
endfunction

function! VisualSelection(direction, extra_filter) range
    let l:saved_reg = @"
    execute "normal! vgvy"

    let l:pattern = escape(@", "\\/.*'$^~[]")
    let l:pattern = substitute(l:pattern, "\n$", "", "")

    if a:direction == 'gv'
        call CmdLine("Ack '" . l:pattern . "' " )
    elseif a:direction == 'replace'
        call CmdLine("%s" . '/'. l:pattern . '/')
    endif

    let @/ = l:pattern
    let @" = l:saved_reg
endfunction

"================================================

"================= Basic Config =================

" mouse scrolling support
" set mouse=a

" Maintain undo history between sessions
set undofile
set undodir=~/.config/nvim/undodir

" layout/format
set expandtab
set tabstop=4
set shiftwidth=4

" line number
set relativenumber
set number

" column & line highlight
set cursorcolumn
set cursorline

"highlight CursorLine    cterm=NONE ctermbg=white ctermfg=NONE guibg=NONE guifg=NONE
"highlight CursorColumn  cterm=NONE ctermbg=white ctermfg=NONE guibg=NONE guifg=NONE

" search
set ignorecase
set incsearch
set hlsearch
set smartcase

" map leader key
let mapleader = ","

" TextEdit might fail if hidden is not set.
set hidden

" always show status line
set laststatus=2

" nobackup
set nobackup
set nowritebackup

" noswapfile
set noswapfile

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

" Having longer updatetime (default is 4000 ms = 4 s) leads to noticeable
" delays and poor user experience.
set updatetime=300

" jump to last edit/view position when opening a file
if has("autocmd")
  au BufReadPost * if line("'\"") > 1 && line("'\"") <= line("$") | exe "normal! g'\"" | endif
endif

"================================================


"===================== Plugins ==================
" automated installation of vimplug if not installed
if empty(glob('~/.local/share/nvim/site/autoload/plug.vim'))
    silent !curl -fLo ~/.local/share/nvim/site/autoload/plug.vim --create-dirs
        \ https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim
    autocmd VimEnter * PlugInstall --sync | source ~/.config/nvim/init.vim
endif

" automatically install missing plugins on startup
autocmd VimEnter *
  \  if len(filter(values(g:plugs), '!isdirectory(v:val.dir)'))
  \|   PlugInstall --sync | q
  \| endif

" load plugins
call plug#begin()

" status line
Plug 'vim-airline/vim-airline'
Plug 'vim-airline/vim-airline-themes'

" colorscheme
Plug 'ayu-theme/ayu-vim'
Plug 'morhetz/gruvbox'

Plug 'neoclide/coc.nvim', { 'branch': 'release' }

Plug 'tpope/vim-sleuth'
Plug 'editorconfig/editorconfig-vim'

Plug 'jiangmiao/auto-pairs'
Plug 'machakann/vim-sandwich'

" git
Plug 'airblade/vim-gitgutter'
Plug 'tpope/vim-fugitive'

" nerdtree
Plug 'preservim/nerdtree'

" tags
Plug 'ludovicchabant/vim-gutentags'
Plug 'skywind3000/gutentags_plus'
Plug 'vim-scripts/taglist.vim'
Plug 'jstemmer/gotags'
Plug 'preservim/tagbar'

" ack vim
Plug 'mileszs/ack.vim'

" markdown preview
Plug 'iamcco/markdown-preview.nvim', { 'do': { -> mkdp#util#install() }, 'for': ['markdown', 'vim-plug']}

" golang
Plug 'fatih/vim-go', { 'do': ':GoUpdateBinaries' }

call plug#end()

"================================================


"================ Plugins Config ================

" airline
let g:airline#extensions#tabline#formatter = 'unique_tail_improved'
let g:airline#extensions#tabline#left_sep = ' '
let g:airline#extensions#tabline#left_alt_sep = '|'
let g:airline#extensions#tabline#enabled = 1
let g:airline#extensions#tabline#buffer_nr_show = 1

" nerdtree
let NERDTreeShowHidden=0
let NERDTreeIgnore = ['\.pyc$', '__pycache__']
let g:NERDTreeWinSize=35
map <leader>nn :NERDTreeToggle<cr>
map <leader>nb :NERDTreeFromBookmark<Space>
map <leader>nf :NERDTreeFind<cr>

:autocmd FileType nerdtree set norelativenumber
:autocmd FileType taglist set norelativenumber

" gutentags
" let g:gutentags_trace = 1
" enable gtags module
let g:gutentags_modules = ['ctags', 'gtags_cscope']

" config project root markers.
let g:gutentags_project_root = ['.root', '.git', '.idea', '.vscode']

let g:gutentags_ctags_tagfile = '.tags'

" generate datebases in my cache directory, prevent gtags files polluting my project
let s:vim_tags = expand('~/.cache/tags')
let g:gutentags_cache_dir = s:vim_tags
if !isdirectory(s:vim_tags)
   silent! call mkdir(s:vim_tags, 'p')
endif

"autocmd VimEnter * nested :TagbarOpen

let g:tagbar_type_go = {
    \ 'ctagstype' : 'go',
    \ 'kinds'     : [
        \ 'p:package',
        \ 'i:imports:1',
        \ 'c:constants',
        \ 'v:variables',
        \ 't:types',
        \ 'n:interfaces',
        \ 'w:fields',
        \ 'e:embedded',
        \ 'm:methods',
        \ 'r:constructor',
        \ 'f:functions'
    \ ],
    \ 'sro' : '.',
    \ 'kind2scope' : {
        \ 't' : 'ctype',
        \ 'n' : 'ntype'
    \ },
    \ 'scope2kind' : {
        \ 'ctype' : 't',
        \ 'ntype' : 'n'
    \ },
    \ 'ctagsbin'  : 'gotags',
    \ 'ctagsargs' : '-sort -silent'
\ }
nnoremap <silent> <F8> :TagbarToggle<CR>
let tagbar_left=1
let tagbar_width=40
let g:tagbar_compact=1

""" taglist
nnoremap <silent> <F9> :TlistToggle<CR>
let Tlist_Show_One_File = 1
let Tlist_Exit_OnlyWindow = 1
"let Tlist_Use_Right_Window = 1

" change focus to quickfix window after search (optional).
let g:gutentags_plus_switch = 1

let g:gutentags_ctags_extra_args = []
let g:gutentags_ctags_extra_args = ['--fields=+niazS', '--extra=+q']
let g:gutentags_ctags_extra_args += ['--c++-kinds=+px']
let g:gutentags_ctags_extra_args += ['--c-kinds=+px']

set statusline+=%{gutentags#statusline()}

" coc status line
set statusline^=%{coc#status()}%{get(b:,'coc_current_function','')}

" Use the the_silver_searcher if possible (much faster than Ack)
if executable('ag')
  let g:ackprg = 'ag --vimgrep --smart-case'
endif

" When you press gv you Ack after the selected text
vnoremap <silent> gv :call VisualSelection('gv', '')<CR>

" Open Ack and put the cursor in the right position
map <leader>g :Ack

" When you press <leader>r you can search and replace the selected text
vnoremap <silent> <leader>r :call VisualSelection('replace', '')<CR>

" Do :help cope if you are unsure what cope is. It's super useful!
"
" When you search with Ack, display your results in cope by doing:
"   <leader>cc
"
" To go to the next search result do:
"   <leader>n
"
" To go to the previous search results do:
"   <leader>p
"
map <leader>cc :botright cope<cr>
map <leader>co ggVGy:tabnew<cr>:set syntax=qf<cr>pgg
map <leader>n :cn<cr>
map <leader>p :cp<cr>

" Make sure that enter is never overriden in the quickfix window
autocmd BufReadPost quickfix nnoremap <buffer> <CR> <CR>
"================================================


"================= Color Themes =================

colorscheme gruvbox

" ayu colorscheme config
set termguicolors     " enable true colors support
let ayucolor="light"  " for light version of theme
let ayucolor="mirage" " for mirage version of theme
let ayucolor="dark"   " for dark version of theme

" airline colorscheme config
let g:airline_theme='gruvbox'
let g:airline_solarized_bg='dark'
let g:airline_powerline_fonts = 1

"================================================


"================= Key Mappings =================

" window spliting/movement
function! WinMove(key)
    let t:curwin = winnr()
    exec "wincmd ".a:key
    if (t:curwin == winnr())
        if (match(a:key,'[jk]'))
            wincmd v
        else
            wincmd s
        endif
        exec "wincmd ".a:key
    endif
endfunction

nnoremap <silent> <C-h> :call WinMove('h')<CR>
nnoremap <silent> <C-j> :call WinMove('j')<CR>
nnoremap <silent> <C-k> :call WinMove('k')<CR>
nnoremap <silent> <C-l> :call WinMove('l')<CR>

" Mappings for coc
inoremap <expr> <Tab> pumvisible() ? "\<C-n>" : "\<Tab>"
inoremap <expr> <S-Tab> pumvisible() ? "\<C-p>" : "\<S-Tab>"

inoremap <silent><expr> <C-space> coc#refresh()

"GoTo code navigation
nmap <leader>g <C-o>
nmap <silent> gd <Plug>(coc-definition)
nmap <silent> gt <Plug>(coc-type-definition)
nmap <silent> gi <Plug>(coc-implementation)
nmap <silent> gr <Plug>(coc-references)

nmap <leader>rn <Plug>(coc-rename)

" 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>
" Show files
nnoremap <silent><nowait> <space>f  :<C-u>CocList files<cr>
" Show most recent used files
nnoremap <silent><nowait> <space>m  :<C-u>CocList mru<cr>


"================================================