Enable native LSP in neovim.

Just YOLO it now that 0.5.0 has been released.

.gitmodules

@@ -19,3 +19,6 @@
 [submodule "sourcecode/subprojects/get-otp"]
 	path = sourcecode/subprojects/get-otp
 	url = https://github.com/ericonr/get-otp.git
+[submodule "nvim/.config/nvim/pack/plugins/start/nvim-lspconfig"]
+	path = nvim/.config/nvim/pack/plugins/start/nvim-lspconfig
+	url = https://github.com/neovim/nvim-lspconfig.git

nvim/.config/nvim/init.vim

@@ -51,6 +51,78 @@ colorscheme slate
 autocmd BufNewFile,BufRead template setfiletype sh
 
 
+" LANGUAGE SERVER
+
+" Partly from https://github.com/neovim/nvim-lspconfig/blob/master/README.md
+lua << EOF
+local nvim_lsp = require('lspconfig')
+
+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
+
+  buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')
+
+  -- Mappings.
+  local opts = { noremap=true, silent=true }
+  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', '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)
+
+  -- Set some keybinds conditional on server capabilities
+  if client.resolved_capabilities.document_formatting then
+    buf_set_keymap("n", "<space>f", "<cmd>lua vim.lsp.buf.formatting()<CR>", opts)
+  elseif client.resolved_capabilities.document_range_formatting then
+    buf_set_keymap("n", "<space>f", "<cmd>lua vim.lsp.buf.range_formatting()<CR>", opts)
+  end
+
+  -- Set autocommands conditional on server_capabilities
+  if client.resolved_capabilities.document_highlight then
+    vim.api.nvim_exec([[
+      hi LspReferenceRead cterm=bold ctermbg=red guibg=LightYellow
+      hi LspReferenceText cterm=bold ctermbg=red guibg=LightYellow
+      hi LspReferenceWrite cterm=bold ctermbg=red guibg=LightYellow
+      augroup lsp_document_highlight
+        autocmd! * <buffer>
+        autocmd CursorHold <buffer> lua vim.lsp.buf.document_highlight()
+        autocmd CursorMoved <buffer> lua vim.lsp.buf.clear_references()
+      augroup END
+    ]], false)
+  end
+end
+
+-- Use a loop to conveniently both setup defined servers
+-- and map buffer local keybindings when the language server attaches
+-- rust_analyzer
+local servers = { "pyright", "tsserver", "clangd" }
+for _, lsp in ipairs(servers) do
+  nvim_lsp[lsp].setup { on_attach = on_attach }
+end
+
+if (false)
+then
+	nvim_lsp.ccls.setup {
+		 init_options = {
+			compilationDatabaseDirectory = "build";
+		 };
+		 on_attach = on_attach;
+	}
+end
+EOF
+
+
 " FUNCTIONS
 
 " Sets up the editor for spaces instead of tabs - WIP

nvim/.config/nvim/pack/plugins/start/nvim-lspconfig

@@ -0,0 +1 @@
+Subproject commit a21a509417aa530fb7b54020f590fa5ccc67de77