Add support for subcommands to `Distribution.Simple.Command`
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Cabal: other
old-milestone: ⊥
type: enhancement
- Dominant language
- Haskell
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Description
It'd be nice if the `D.S.Command` framework supported subcommands directly. Currently we have to resort to parsing command-line arguments manually to implement things like `cabal sandbox add-source --snapshot`.
Related: #1104.
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