Accept arguments for command in plugin definition

[danielkza]

Currently plugin definitions only accept an executable, so there is no way to pass some pre-defined arguments to precede the ones from the template invocation.

As a (somewhat contrived) example, If i want a plugin to evaluate a python expression, I should be able to do:

plugins:
  py: ["python3", "-c"]

{{ py "print('Hello, world')" }}

So that I don't need to have "-c" in every invocation.

[danielkza]

Other ways to define it in the config could also work nicely:

plugins:
  py:
    cmd: python3
    args: ["-c"]

[hairyhenderson]

Thanks for filing this @danielkza (and sorry for the delay!).

The args option seems reasonable.

[github-actions]

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