What I want is to add possibility to interact with application, and be able to extract information from application or event ask it to change some states.

For that purpose I though of building cli utility. The utility will connect to the application and send user commands (one line strings) to the application and wait for response from the application.

The command should contain: - command name (e.g. display-session-table/set-log-level etc.) - optionally command may have several arguments (e.g. log-level=10)

The question to choose syntax and to learn parse it fast and correctly.

I don't want to reinvent the whell, so maybe there's already an answer out there.