Some complete usability improvements
#7321
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Currently only `complete` will list completions, and it will list all of them. That's a bit ridiculous, especially since `complete -c foo` just does nothing. So just make `complete -c foo` list all the completions for `foo`.
Currently, completions have to be specified like ```fish complete -c foo -l opt ``` while ```fish complete foo -l opt ``` just complains about there being too many arguments. That's kinda useless, so we just assume if there is one left-over argument that it's meant to be the command. Theoretically we could also use *all* the arguments as commands to complete, but that seems unlikely to be what the user wants. (I don't think multi-command completions really happen)
These have been removed for ages, the complete docs are too verbose as it is.
A bit stuffy, some weird bits (I don't think GNU-style long options can typically be abbreviated, ``true --v`` and ``bash --hel`` don't work).
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Description
This fixes a few of
completes usage warts.-c commandas the first two arguments. This makes the-coptional, if there is one non-option argument it's used as the commandcomplete -c commandwithout any other options now lists just the (loaded) completions for that commandTODOs: