Vim 0.5 Rust Setup

init.vim

" 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 for built-in LSP
Plug 'nvim-lua/completion-nvim'

" Some color scheme other then default
Plug 'franbach/miramare'

call plug#end()

syntax enable
filetype plugin indent on

colorscheme miramare


" Set completeopt to have a better completion experience
set completeopt=menuone,noinsert,noselect

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

set number
set mouse=a
set keymodel=startsel,stopsel

" Configure lsp
" https://github.com/neovim/nvim-lspconfig#rust_analyzer
lua <<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

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=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>

" Trigger completion with <tab>
" found in :help completion
" 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)

" 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"} }