nvim: update

vim/.config/nvim/lua/plugins/lsp.lua

@@ -9,27 +9,80 @@ end)
 
 require('mason').setup({})
 require('mason-lspconfig').setup({
-  ensure_installed = {},
+  ensure_installed = { 'ruby_ls' },
   handlers = { lsp_zero.default_setup },
 })
 
-lspconfig.solargraph.setup({
-  -- there's a very weird problem with mason-provided solargraph
-  -- so instead I'm using the one from asdf
-  cmd = { os.getenv( "HOME" ) .. "/.asdf/shims/solargraph", 'stdio' },
-  settings = {
-    solargraph = {
-      autoformat = true,
-      completion = true,
-      diagnostic = true,
-      folding = true,
-      references = true,
-      rename = true,
-      symbols = true
-    }
-  }
-})
+-- lspconfig.solargraph.setup({
+--   -- there's a very weird problem with mason-provided solargraph
+--   -- so instead I'm using the one from asdf
+--   cmd = { os.getenv( "HOME" ) .. "/.asdf/shims/solargraph", 'stdio' },
+--   settings = {
+--     solargraph = {
+--       autoformat = true,
+--       completion = true,
+--       diagnostic = true,
+--       folding = true,
+--       references = true,
+--       rename = true,
+--       symbols = true
+--     }
+--   }
+-- })
 
 lspconfig.lua_ls.setup(lsp_zero.nvim_lua_ls())
 
+-- See https://github.com/Shopify/ruby-lsp/blob/main/EDITORS.md#neovim-lsp
+-- textDocument/diagnostic support until 0.10.0 is released
+-- IMPORTANT: look into how much resources ruby-lsp consumes
+local _timers = {}
+local function setup_diagnostics(client, buffer)
+  if require("vim.lsp.diagnostic")._enable then
+    return
+  end
+
+  local diagnostic_handler = function()
+    local params = vim.lsp.util.make_text_document_params(buffer)
+    client.request("textDocument/diagnostic", { textDocument = params }, function(err, result)
+      if err then
+        local err_msg = string.format("diagnostics error - %s", vim.inspect(err))
+        vim.lsp.log.error(err_msg)
+      end
+      if not result then
+        return
+      end
+      vim.lsp.diagnostic.on_publish_diagnostics(
+        nil,
+        vim.tbl_extend("keep", params, { diagnostics = result.items }),
+        { client_id = client.id }
+      )
+    end)
+  end
+
+  diagnostic_handler() -- to request diagnostics on buffer when first attaching
+
+  vim.api.nvim_buf_attach(buffer, false, {
+    on_lines = function()
+      if _timers[buffer] then
+        vim.fn.timer_stop(_timers[buffer])
+      end
+      _timers[buffer] = vim.fn.timer_start(200, diagnostic_handler)
+    end,
+    on_detach = function()
+      if _timers[buffer] then
+        vim.fn.timer_stop(_timers[buffer])
+      end
+    end,
+  })
+end
+
+-- trying out ruby-lsp from Shopify
+-- maybe will replace solargraph
+lspconfig.ruby_ls.setup({
+  cmd = { os.getenv( "HOME" ) .. "/.asdf/shims/ruby-lsp", 'stdio' },
+  on_attach = function(client, buffer)
+    setup_diagnostics(client, buffer)
+  end,
+})
+
 lsp_zero.setup()