feat(nvim): add <leader>kd binding to kill (toggle) diagnostics

Because sometimes a work-in-progress edit is so broken that Neovim
lights up like a Christmas tree, and (as Tim Robinson might say):

> You can't see shit! You can't see fucken shit!

aspects/nvim/files/.config/nvim/lua/wincent/lsp.lua

@@ -2,6 +2,13 @@ local lsp = {}
 
 local on_attach = function()
  vim.keymap.set('n', '<Leader>ld', '<cmd>lua vim.diagnostic.open_float()<CR>', { buffer = true, silent = true })
+
+ -- Mnemonic: kd = "kill diagnostics" (although it's really "toggle diagnostics")
+ vim.keymap.set('n', '<Leader>kd', function()
+ local toggle = not vim.diagnostic.config().virtual_text
+ vim.diagnostic.config({ virtual_text = toggle })
+ end, { buffer = true, silent = true })
+
  vim.keymap.set('n', '<c-]>', '<cmd>lua vim.lsp.buf.definition()<CR>', { buffer = true, silent = true })
  vim.keymap.set('n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>', { buffer = true, silent = true })
  vim.keymap.set('n', 'gd', '<cmd>lua vim.lsp.buf.declaration()<CR>', { buffer = true, silent = true })