_vimrc

" 2026 vimrc config

call plug#begin()

Plug 'morhetz/gruvbox'
Plug 'vim-airline/vim-airline'
Plug 'prabirshrestha/vim-lsp'
Plug 'mattn/vim-lsp-settings'
Plug 'prabirshrestha/asyncomplete.vim'
Plug 'prabirshrestha/asyncomplete-lsp.vim'

call plug#end()

" --- General Settings ---
"syntax on			" Enable syntax highlighting
set number			" Show line numbers
set relativenumber		" Relative numbers help with jumping lines
set cursorline			" Highlight the current line
set clipboard=unnamedplus	" Use sytem clipboard
set noshowmode          " hide message from the bottom line
set mouse=a " enable mouse

set encoding=utf-8

" Turn off backup and swp file
set nobackup
set nowritebackup
set noswapfile

" Reduce updatetime to 300ms to increase user experience
set updatetime=300

" Always show the signcolumn, otherwise it would shift the text each time
" diagnostic appear/become resolved
set signcolumn=yes

" --- C-Specific Indentation --- 
set tabstop=4			" Number of visual spaces per TAB
set softtabstop=4		" Number of spaces in tab when editing
set shiftwidth=4		" Tabs under smartindent
set expandtab			" Convert tabs to spaces
set smartindent			" Intelegent indentation for C
set cindent			" Spesific indentation for C-style languages

" --- Keybindings ---
let mapleader = " "

" --- Netraw settings
nnoremap <space>e :Lexplore<CR>
nnoremap <space>v :Vexplore<CR>
let g:netrw_keepdir = 0
let g:netrw_banner = 1
let g:netrw_liststyle = 3
let g:netrw_browse_split = 3
let g:netrw_winsize = 30

" Use gruvbox theme
set termguicolors
colorscheme gruvbox
set background=dark

" -- [vim-airline] --
let g:airline_powerline_fonts = 1
let g:airline#extensions#tabline#enabled = 1
let g:airline#extensions#tabline#left_sep = ' '
let g:airline#extensions#tabline#left_alt_sep = '|'

" Tab completion
inoremap <expr> <Tab>   pumvisible() ? "\<C-n>" : "\<Tab>"
inoremap <expr> <S-Tab> pumvisible() ? "\<C-p>" : "\<S-Tab>"
inoremap <expr> <cr>    pumvisible() ? asyncomplete#close_popup() : "\<cr>"

" Force refresh
" imap <c-space> <Plug>(asyncomplete_force_refresh)

" Disable diagnostic
" let g:lsp_diagnostic_enabled = 0

" prabirshrestha/asyncomplete.vim
" ====================================
let g:asyncomplete_auto_popup = 0

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

inoremap <silent><expr> <TAB>
    \ pumvisible() ? "\<C-n>" :
    \ <SID>check_back_space() ? "\<TAB>" :
    \ asyncomplete#force_refresh()
inoremap <expr><S-TAB> pumvisible() ? "\<C-p>" : "\<C-h>"

" lsp mapping
function! s:on_lsp_buffer_enabled() abort
    setlocal omnifunc=lsp#complete
    setlocal signcolumn=yes
    if exists('+tagfunc') | setlocal tagfunc=lsp#tagfunc | endif
    nmap <buffer> gd <plug>(lsp-definition)
    nmap <buffer> gs <plug>(lsp-document-symbol-search)
    nmap <buffer> gS <plug>(lsp-workspace-symbol-search)
    nmap <buffer> gr <plug>(lsp-references)
    nmap <buffer> gi <plug>(lsp-implementation)
    nmap <buffer> gx <plug>(lsp-type-definition)
    nmap <buffer> <leader>rn <plug>(lsp-rename)
    nmap <buffer> [g <plug>(lsp-previous-diagnostic)
    nmap <buffer> ]g <plug>(lsp-next-diagnostic)
    nmap <buffer> K <plug>(lsp-hover)
    nmap <buffer> gf <plug>(lsp-document-format)
    nnoremap <buffer> <expr><c-f> lsp#scroll(+4)
    nnoremap <buffer> <expr><c-d> lsp#scroll(-4)

    let g:lsp_format_sync_timeout = 1000
    autocmd! BufWritePre *.rs,*.go call execute('LspDocumentFormatSync')
    
    " refer to doc to add more commands
endfunction

augroup lsp_install
    au!
    " call s:on_lsp_buffer_enabled only for languages that has the server registered.
    autocmd User lsp_buffer_enabled call s:on_lsp_buffer_enabled()
augroup END

" folding
"set foldmethod=expr
"    \ foldexpr=lsp#ui#vim#folding#foldexpr()
"    \ foldtext=lsp#ui#vim#folding#foldtext()