Use active selection as input for commands

[mjs510]

I work with many yaml files that contain certificates as dictionary values. It would be really useful to be able to select one of these certificates within the file and then run, for example, the certificate preview command. At the moment the command seems to operate on the entire file and so can not preview the individual certificates within it.

Desired bevaiour:

• Open a file in Code containing arbitrary content but with a PEM certificate somewhere within that content
• Manually select the text containing the certificate in Code
• Run the Show OpenSSL Preview command
• See the results for the selected certificate

Current behaviour:

• The preview window opens with "Preview not available"