These four completions all have a strange pattern (that doesn't
work.)
set -l subcommands cmd1 cmd2 cmd3 ...
complete -n "__fish_use_subcommand $subcommands" -c foo -a cmd1
complete -n "__fish_use_subcommand $subcommands" -c foo -a cmd2
complete -n "__fish_use_subcommand $subcommands" -c foo -a cmd3
Remove the redundant lists of subcommands and the unused argument
passed to __fish_use_subcommand for bosh, cf, mariner, and port.
Of note: The rpm/yum thing seems to be coupled, so I put it into one
function that tries the yum helper and uses the rpm path otherwise.
Zypper is already its own thing, so this should only be used for yum
and probably dnf (does that still have the helper?)
Zypper can be dropped, as that already used a separate function in the file.
Apk can just be inlined - it's literally one line for installed and another for all packages.
