neovim-init-lsp.vim

" This is an example on how rust-analyzer can be configure using lsp-config

" Prerequisites:
" - neovim >= 0.5
" - rust-analyzer: https://rust-analyzer.github.io/manual.html#rust-analyzer-language-server-binary

" Steps:
" - :PlugInstall
" - Restart

call plug#begin('~/.vim/plugged')

" Collection of common configurations for the Nvim LSP client
Plug 'neovim/nvim-lspconfig'

" Extentions to built-in LSP, for example, providing type inlay hints
Plug 'nvim-lua/lsp_extensions.nvim'

" Autocompletion framework
Plug 'hrsh7th/nvim-cmp'
" cmp LSP completion
Plug 'hrsh7th/cmp-nvim-lsp'
" cmp Snippet completion
Plug 'hrsh7th/cmp-vsnip'
" cmp Path completion
Plug 'hrsh7th/cmp-path'
Plug 'hrsh7th/cmp-buffer'
" See hrsh7th other plugins for more great completion sources!

" Snippet engine
Plug 'hrsh7th/vim-vsnip'

" Some color scheme other then default
Plug 'arcticicestudio/nord-vim'

call plug#end()

colorscheme nord


" 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#rust_analyzer
lua <<EOF

-- nvim_lsp object
local nvim_lsp = require'lspconfig'

local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities.textDocument.completion.completionItem.snippetSupport = true

-- Enable rust_analyzer
nvim_lsp.rust_analyzer.setup({
    capabilities=capabilities,
    -- on_attach is a callback called when the language server attachs to the buffer
    -- on_attach = on_attach,
    settings = {
      -- to enable rust-analyzer settings visit:
      -- https://github.com/rust-analyzer/rust-analyzer/blob/master/docs/user/generated_config.adoc
      ["rust-analyzer"] = {
        -- enable clippy diagnostics on save
        checkOnSave = {
          command = "clippy"
        },
      }
    }
})

-- Enable diagnostics
vim.lsp.handlers["textDocument/publishDiagnostics"] = vim.lsp.with(
  vim.lsp.diagnostic.on_publish_diagnostics, {
    virtual_text = false,
    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>
nnoremap <silent> gd    <cmd>lua vim.lsp.buf.definition()<CR>

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

" Setup Completion
" See https://github.com/hrsh7th/nvim-cmp#basic-configuration
lua <<EOF
local cmp = require'cmp'
cmp.setup({
  snippet = {
    expand = function(args)
        vim.fn["vsnip#anonymous"](args.body)
    end,
  },
  mapping = {
    ['<C-p>'] = cmp.mapping.select_prev_item(),
    ['<C-n>'] = cmp.mapping.select_next_item(),
    -- Add tab support
    ['<S-Tab>'] = cmp.mapping.select_prev_item(),
    ['<Tab>'] = cmp.mapping.select_next_item(),
    ['<C-d>'] = cmp.mapping.scroll_docs(-4),
    ['<C-f>'] = cmp.mapping.scroll_docs(4),
    ['<C-Space>'] = cmp.mapping.complete(),
    ['<C-e>'] = cmp.mapping.close(),
    ['<CR>'] = cmp.mapping.confirm({
      behavior = cmp.ConfirmBehavior.Insert,
      select = true,
    })
  },

  -- Installed sources
  sources = {
    { name = 'nvim_lsp' },
    { name = 'vsnip' },
    { name = 'path' },
    { name = 'buffer' },
  },
})
EOF

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

" 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()

" Goto previous/next diagnostic warning/error
nnoremap <silent> g[ <cmd>lua vim.lsp.diagnostic.goto_prev()<CR>
nnoremap <silent> g] <cmd>lua vim.lsp.diagnostic.goto_next()<CR>

" 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"} }