Add markdown preview, update rust.vim

sources_non_forked/markdown-preview.nvim/app/nvim.js

@@ -0,0 +1,26 @@
+const attach = require('./lib/attach').default
+const logger = require('./lib/util/logger')('app/nvim')
+
+const MSG_PREFIX = '[markdown-preview.nvim]'
+
+const plugin = attach({
+  reader: process.stdin,
+  writer: process.stdout
+})
+
+process.on('uncaughtException', function (err) {
+  let msg = `${MSG_PREFIX} uncaught exception: ` + err.stack
+  if (plugin.nvim) {
+    plugin.nvim.call('mkdp#util#echo_messages', ['Error', msg.split('\n')])
+  }
+  logger.error('uncaughtException', err.stack)
+})
+
+process.on('unhandledRejection', function (reason, p) {
+  if (plugin.nvim) {
+    plugin.nvim.call('mkdp#util#echo_messages', ['Error', [`${MSG_PREFIX} UnhandledRejection`, `${reason}`]])
+  }
+  logger.error('unhandledRejection ', p, reason)
+})
+
+exports.plugin = plugin