[Twisted-Python] Multiple plugins in "twistd"

[Tom Prince]

Glyph <glyph at twistedmatrix.com> writes:

> You could also find some other way to split the argument list but "+" doesn't seem particularly obscure in this context to me.  (If there's really a need to pass a literal "+" to a plugin we could add an escaping syntax as well.)

I think if we are adding syntax, then we should also add escaping at the
same time.

On a related note, when designing this kind of syntax, I think it is
often valuable to explictly leave some of the space as an explict error,
to leave freedom to extend the syntax in the future.

I wonder if there is any value in having a syntax that is nestable. I
don't see any specific use case, but I can imagine wanting ot pass
options to `compose` that are scoped to an individual plugin that it is
loading. And then, maybe you want to nest things so that those options
apply to a subset of plugins, which might naturally be implemented as
compos of a compose.

The suggestions in the last paragraph are perhaps somewhat contrived,
and certainly not something that should be *implemnted* in a first (or
even second pass). But considering the possiblity, and then picking a
syntax that might allow those kinds of extension (and then explictly
making the extension syntax an error) gives us the ability to add those
features without breaking backwards compatibility.

  Tom