Introducing `jhack script`: AKA on-the-fly debugging actions for charms

charm
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Hi @ppasotti, this is great! Somewhat surprising that no one has written a tool like this before. Is this coming to a snap near me soon? (I can run it from source, but I tried the edge snap and it’s not there yet.)

Small nits on the UX:

  • Given that one will almost always specify the script, would jhack script app/0 [script.py] be a slightly nicer UI? You could still leave it off and get stdin, but no need for --input or -i.
  • I think crpc might be even more useful – I’ve often wanted to do quick checks like that. I guess the first “c” in “crpc” means “charm”, but it seems to me that’s kinda redundant in this context. What about just jhack rpc, or even jhack eval? (It’s very similar to Python’s own eval but for a charm.)
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