refactor(parser): Extract Actions from Parser #3773
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There is a default_missing_vals case which is slightly different because its not actually a default but closing out the remaining argument that was started in last iteration.
When creating `PendingValues`, I can't have the lifetime. I could make it a `Cow` but decided to hold off instead since we don't need this right now. Maybe by the time we do need it, we'll have another way of doing this.
This changes how occurrences and values are grouped for multiple values. Today, it appears as a bug. If we move forward with clap-rs#3772, then this can make sense.
If we felt this was important long-term, we should fix this outside of the Action. Since we might be changing up occurrences (clap-rs#3772), we can probably get away with a hack.
My hope is to add group actions as well, so we need to qualify what kind of action this is.
This fixes a compatibility issue introduced in 9805fda
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This is not publicly exposed yet and is a step towards #3405. Nearly all storing of data into
ArgMatchesis extracted into areactfunction that is based on anActionenum associated with theArg. I said "nearly" because we can't quite do this for external subcommand values.The parser iterates once per argv field. This presented a problem for flags with values and multi-valued positionals. We handle this by tracking "pending" values and resolving them before reacting to the current value. This comes at some behavior changes for
ArgMatches::occurrences_ofthat could be fine for future versions of the actions though we should reconsider this before release.