nvim: Add lightbulb for discoverable LSP code actions

nvim/.config/nvim/after/plugin/nvim-lightbulb.lua

@@ -0,0 +1,20 @@
+require'nvim-lightbulb'.update_lightbulb {
+  sign = {
+    enabled  = true,
+    priority = 10,
+  },
+  float = {
+    enabled  = true,
+    text     = "💡",
+    win_opts = {},
+  },
+  virtual_text = {
+    enabled = true,
+    text    = "💡",
+},
+  status_text = {
+    enabled          = true,
+    text             = "💡",
+    text_unavailable = ""
+  }
+}

nvim/.config/nvim/lua/lsp.lua

@@ -162,6 +162,8 @@ local on_attach = function(client, bufnr)
     vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gf', ':TSLspFixCurrent<CR>', { silent = true })
     vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gI', ':TSLspImportAll<CR>',  { silent = true })
   end
+
+  vim.cmd [[autocmd CursorHold,CursorHoldI <buffer> lua require'nvim-lightbulb'.update_lightbulb()]]
 end
 
 function set_snippet_capabilities()

nvim/.config/nvim/lua/plugins.lua

@@ -78,6 +78,7 @@ local init = function ()
   use {
     'neovim/nvim-lspconfig',
     'ray-x/lsp_signature.nvim',
+    'kosayoda/nvim-lightbulb',
   }
   -- Language support & syntax highlighting
   -- Coq