31ddd87da0
We often have a pattern where the same verb function is used for multiple actions. This leads to an antipattern where we figure out what action needs to be taken from argv[0] multiple times: often once in parse_argv() to figure out what options are allowed, then once again implicitly in dispatch_verb(), and then again in the action verb itself. Let's allow passing a parameter into the verb to simplify this. This matches a pattern we have in conf-parser.h, where we have both void *userdata (more global) and void *data (per-config item). Here, I opted for uintptr_t userdata. It seems that most of the time we'll want to just pass an enum value. This works OK with no casts. I also tried a void* and union. In both cases, much more boilerplate is needed: either a cast or a macro to help avoid compiler warnings. uintptr_t seems generic enough to cover foreseeable usecases with no fuss. This is a noop refactoring. See next commit for an example.
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