nvim: Switch to native lsp

.config/nvim/init.vim

@@ -12,7 +12,7 @@ unlet autoload_plug_path
 call plug#begin('~/.config/nvim/plugins')
 
 " Code development helpers {{{
-Plug 'neoclide/coc.nvim', {'branch': 'release'} | Plug 'jackguo380/vim-lsp-cxx-highlight'
+Plug 'neovim/nvim-lspconfig'
 Plug 'SirVer/ultisnips' | Plug 'honza/vim-snippets'
 Plug 'wellle/context.vim'
 Plug 'dbeniamine/cheat.sh-vim'
@@ -117,141 +117,7 @@ else
   set signcolumn=yes
 endif
 
-" Use tab for trigger completion with characters ahead and navigate.
+set colorcolumn=80
-" NOTE: Use command ':verbose imap <tab>' to make sure tab is not mapped by
-" other plugin before putting this into your config.
-inoremap <silent><expr> <TAB>
-      \ pumvisible() ? "\<C-n>" :
-      \ <SID>check_back_space() ? "\<TAB>" :
-      \ coc#refresh()
-inoremap <expr><S-TAB> pumvisible() ? "\<C-p>" : "\<C-h>"
-
-function! s:check_back_space() abort
-  let col = col('.') - 1
-  return !col || getline('.')[col - 1]  =~# '\s'
-endfunction
-
-" Use <c-space> to trigger completion.
-if has('nvim')
-  inoremap <silent><expr> <c-space> coc#refresh()
-else
-  inoremap <silent><expr> <c-@> coc#refresh()
-endif
-
-" Make <CR> auto-select the first completion item and notify coc.nvim to
-" format on enter, <cr> could be remapped by other vim plugin
-inoremap <silent><expr> <cr> pumvisible() ? coc#_select_confirm()
-                              \: "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"
-
-" Use `[g` and `]g` to navigate diagnostics
-" Use `:CocDiagnostics` to get all diagnostics of current buffer in location list.
-nmap <silent> [g <Plug>(coc-diagnostic-prev)
-nmap <silent> ]g <Plug>(coc-diagnostic-next)
-
-" GoTo code navigation.
-nmap <silent> gd <Plug>(coc-definition)
-nmap <silent> gy <Plug>(coc-type-definition)
-nmap <silent> gi <Plug>(coc-implementation)
-nmap <silent> gr <Plug>(coc-references)
-
-" Use K to show documentation in preview window.
-nnoremap <silent> K :call <SID>show_documentation()<CR>
-
-function! s:show_documentation()
-  if (index(['vim','help'], &filetype) >= 0)
-    execute 'h '.expand('<cword>')
-  elseif (coc#rpc#ready())
-    call CocActionAsync('doHover')
-  else
-    execute '!' . &keywordprg . " " . expand('<cword>')
-  endif
-endfunction
-
-" Highlight the symbol and its references when holding the cursor.
-autocmd CursorHold * silent call CocActionAsync('highlight')
-
-" Symbol renaming.
-nmap <leader>rn <Plug>(coc-rename)
-
-" Formatting selected code.
-xmap <leader>f  <Plug>(coc-format-selected)
-nmap <leader>f  <Plug>(coc-format-selected)
-
-augroup mygroup
-  autocmd!
-  " Setup formatexpr specified filetype(s).
-  autocmd FileType typescript,json setl formatexpr=CocAction('formatSelected')
-  " Update signature help on jump placeholder.
-  autocmd User CocJumpPlaceholder call CocActionAsync('showSignatureHelp')
-augroup end
-
-" Applying codeAction to the selected region.
-" Example: `<leader>aap` for current paragraph
-xmap <leader>a  <Plug>(coc-codeaction-selected)
-nmap <leader>a  <Plug>(coc-codeaction-selected)
-
-" Remap keys for applying codeAction to the current buffer.
-nmap <leader>ac  <Plug>(coc-codeaction)
-" Apply AutoFix to problem on the current line.
-nmap <leader>qf  <Plug>(coc-fix-current)
-
-" Map function and class text objects
-" NOTE: Requires 'textDocument.documentSymbol' support from the language server.
-xmap if <Plug>(coc-funcobj-i)
-omap if <Plug>(coc-funcobj-i)
-xmap af <Plug>(coc-funcobj-a)
-omap af <Plug>(coc-funcobj-a)
-xmap ic <Plug>(coc-classobj-i)
-omap ic <Plug>(coc-classobj-i)
-xmap ac <Plug>(coc-classobj-a)
-omap ac <Plug>(coc-classobj-a)
-
-" Remap <C-f> and <C-b> for scroll float windows/popups.
-if has('nvim-0.4.0') || has('patch-8.2.0750')
-  nnoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
-  nnoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
-  inoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(1)\<cr>" : "\<Right>"
-  inoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(0)\<cr>" : "\<Left>"
-  vnoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
-  vnoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
-endif
-
-" Use CTRL-S for selections ranges.
-" Requires 'textDocument/selectionRange' support of language server.
-nmap <silent> <C-s> <Plug>(coc-range-select)
-xmap <silent> <C-s> <Plug>(coc-range-select)
-
-" Add `:Format` command to format current buffer.
-command! -nargs=0 Format :call CocAction('format')
-
-" Add `:Fold` command to fold current buffer.
-command! -nargs=? Fold :call     CocAction('fold', <f-args>)
-
-" Add `:OR` command for organize imports of the current buffer.
-command! -nargs=0 OR   :call     CocAction('runCommand', 'editor.action.organizeImport')
-
-" Add (Neo)Vim's native statusline support.
-" NOTE: Please see `:h coc-status` for integrations with external plugins that
-" provide custom statusline: lightline.vim, vim-airline.
-set statusline^=%{coc#status()}%{get(b:,'coc_current_function','')}
-
-" 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>
 
 " yoink configuration
 "nmap <leader>yp <plug>(YoinkPostPasteSwapBack)
@@ -304,3 +170,83 @@ let g:airline_stl_path_style = 'short'
 let g:airline_highlighting_cache = 1
 
 let g:startify_custom_header = ''
+
+" Completion configuration for native neovim + nvim-lspconfig
+lua << EOF
+local lspconfig = require'lspconfig'
+lspconfig.ccls.setup {
+  init_options = {
+    compilationDatabaseDirectory = ".";
+    index = {
+      threads = 0;
+    };
+    clang = {
+      excludeArgs = { "-frounding-math"} ;
+    };
+  }
+}
+EOF
+
+lua << EOF
+require'lspconfig'.pyls.setup{}
+EOF
+
+lua << EOF
+require'lspconfig'.cmake.setup{}
+EOF
+
+lua << EOF
+require'lspconfig'.rls.setup {
+  settings = {
+    rust = {
+      unstable_features = true,
+      build_on_save = false,
+      all_features = true,
+    },
+  },
+}
+EOF
+
+lua << EOF
+local nvim_lsp = require('lspconfig')
+
+-- Use an on_attach function to only map the following keys 
+-- after the language server attaches to the current buffer
+local on_attach = function(client, bufnr)
+  local function buf_set_keymap(...) vim.api.nvim_buf_set_keymap(bufnr, ...) end
+  local function buf_set_option(...) vim.api.nvim_buf_set_option(bufnr, ...) end
+
+  --Enable completion triggered by <c-x><c-o>
+  buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')
+
+  -- Mappings.
+  local opts = { noremap=true, silent=true }
+
+  -- See `:help vim.lsp.*` for documentation on any of the below functions
+  buf_set_keymap('n', 'gD', '<Cmd>lua vim.lsp.buf.declaration()<CR>', opts)
+  buf_set_keymap('n', 'gd', '<Cmd>lua vim.lsp.buf.definition()<CR>', opts)
+  buf_set_keymap('n', 'K', '<Cmd>lua vim.lsp.buf.hover()<CR>', opts)
+  buf_set_keymap('n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>', opts)
+  buf_set_keymap('n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
+  buf_set_keymap('n', '<space>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', opts)
+  buf_set_keymap('n', '<space>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>', opts)
+  buf_set_keymap('n', '<space>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', opts)
+  buf_set_keymap('n', '<space>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
+  buf_set_keymap('n', '<space>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
+  buf_set_keymap('n', '<space>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
+  buf_set_keymap('n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>', opts)
+  buf_set_keymap('n', '<space>e', '<cmd>lua vim.lsp.diagnostic.show_line_diagnostics()<CR>', opts)
+  buf_set_keymap('n', '[d', '<cmd>lua vim.lsp.diagnostic.goto_prev()<CR>', opts)
+  buf_set_keymap('n', ']d', '<cmd>lua vim.lsp.diagnostic.goto_next()<CR>', opts)
+  buf_set_keymap('n', '<space>q', '<cmd>lua vim.lsp.diagnostic.set_loclist()<CR>', opts)
+  buf_set_keymap("n", "<space>f", "<cmd>lua vim.lsp.buf.formatting()<CR>", opts)
+
+end
+
+-- Use a loop to conveniently call 'setup' on multiple servers and
+-- map buffer local keybindings when the language server attaches
+local servers = { "pyls", "rls", "cmake", 'ccls' }
+for _, lsp in ipairs(servers) do
+  nvim_lsp[lsp].setup { on_attach = on_attach }
+end
+EOF