init.vim

call plug#begin('~/.vim/plugged')
"Plug 'tpope/vim-sensible'
Plug 'junegunn/fzf'
Plug 'junegunn/fzf.vim'
Plug 'mhinz/vim-startify'

Plug 'NLKNguyen/papercolor-theme'
Plug 'dracula/vim', { 'as': 'dracula' }
Plug 'sainnhe/sonokai'
Plug 'itchyny/lightline.vim'
Plug 'rust-lang/rust.vim'

" Collection of common configurations for the Nvim LSP client
Plug 'neovim/nvim-lspconfig'
" Extensions to built-in LSP, for example, providing type inlay hints
Plug 'nvim-lua/lsp_extensions.nvim'
" Autocompletion framework for built-in LSP
Plug 'nvim-lua/completion-nvim'
call plug#end()

syntax enable
filetype plugin indent on

let mapleader = " "

set number
set relativenumber
set expandtab
set tabstop=4
set shiftwidth=4    "Indent by 4 spaces when using >>, <<, == etc.
set softtabstop=4   "Indent by 4 spaces when pressing <TAB>
set scrolloff=8
set hlsearch
set incsearch
set splitbelow
set splitright

" undo
"set undodir=~/.vim/undodir
"set undofile

" have a fixed column for the diagnostics to appear in
" this removes the jitter when warnings/errors flow in
set signcolumn=yes

colorscheme sonokai
"set background=light
"colorscheme PaperColor
"let g:lightline = { 'colorscheme': 'PaperColor' }

" Set completeopt to have a better completion experience
" :help completeopt
" menuone: popup even when there's only one match
" noinsert: Do not insert text until a selection is made
" noselect: Do not select, force user to select one from the menu
set completeopt=menuone,noinsert,noselect

" Avoid showing extra messages when using completion
set shortmess+=c

" Configure LSP
" https://github.com/neovim/nvim-lspconfig

lua <<EOF
local custom_attach = function(client)
  require'completion'.on_attach(client)
end
require'lspconfig'.clangd.setup{on_attach=custom_attach}
require'lspconfig'.rust_analyzer.setup{on_attach=custom_attach}
EOF

" -- nvim_lsp object
" local nvim_lsp = require'lspconfig'

" -- function to attach completion when setting up lsp
" local on_attach = function(client)
    " require'completion'.on_attach(client)
" end

" -- Enable rust_analyzer
" nvim_lsp.rust_analyzer.setup({ on_attach=on_attach })

" -- Enable diagnostics
" vim.lsp.handlers["textDocument/publishDiagnostics"] = vim.lsp.with(
  " vim.lsp.diagnostic.on_publish_diagnostics, {
    " virtual_text = true,
    " signs = true,
    " update_in_insert = true,
  " }
" )
" EOF

" Code navigation shortcuts
" as found in :help lsp
nnoremap <silent> <c-]> <cmd>lua vim.lsp.buf.definition()<CR>
nnoremap <silent> K     <cmd>lua vim.lsp.buf.hover()<CR>
nnoremap <silent> gD    <cmd>lua vim.lsp.buf.implementation()<CR>
nnoremap <silent> <c-k> <cmd>lua vim.lsp.buf.signature_help()<CR>
nnoremap <silent> 1gD   <cmd>lua vim.lsp.buf.type_definition()<CR>
nnoremap <silent> gr    <cmd>lua vim.lsp.buf.references()<CR>
nnoremap <silent> g0    <cmd>lua vim.lsp.buf.document_symbol()<CR>
nnoremap <silent> gW    <cmd>lua vim.lsp.buf.workspace_symbol()<CR>
" rust-analyzer does not yet support goto declaration
" re-mapped `gd` to definition
nnoremap <silent> gd    <cmd>lua vim.lsp.buf.definition()<CR>
"nnoremap <silent> gd    <cmd>lua vim.lsp.buf.declaration()<CR>

" Quick-fix
nnoremap <silent> ga    <cmd>lua vim.lsp.buf.code_action()<CR>

" Use <Tab> and <S-Tab> to navigate through popup menu
inoremap <expr> <Tab>   pumvisible() ? "\<C-n>" : "\<Tab>"
inoremap <expr> <S-Tab> pumvisible() ? "\<C-p>" : "\<S-Tab>"

" use <Tab> as trigger keys
imap <Tab> <Plug>(completion_smart_tab)
imap <S-Tab> <Plug>(completion_smart_s_tab)

" Set updatetime for CursorHold
" 300ms of no cursor movement to trigger CursorHold
set updatetime=300
" Show diagnostic popup on cursor hover
autocmd CursorHold * lua vim.lsp.diagnostic.show_line_diagnostics()

" Enable type inlay hints
autocmd CursorMoved,InsertLeave,BufEnter,BufWinEnter,TabEnter,BufWritePost *.rs
\ lua require'lsp_extensions'.inlay_hints{ prefix = '', highlight = "Comment", enabled = {"TypeHint", "ChainingHint", "ParameterHint"} }