title: vscode extension: how to create a language specific command
body: <p>I wrote a simple extension for vscode, which registers a command, namely <code>comandName</code>.</p>
  
  <p>In my <code>package.json</code> file I have:</p>
  
  <pre><code>"activationEvents": [
      "onLanguage:python",
      "onCommand:commandName"
  ]
  </code></pre>
  
  <p>I meant to execute this command only for Python. To my knowledge, however, the <code>activationEvents</code> in my <code>package.json</code> means that the command would be activated when a Python file is opened or the command is executed. But the command can be executed within any language. I searched the documentation but found no way to execute the command for certain languages.</p>
  
  <p>Is there any way to achieve this target?</p>