def fmt.ext

cswap-bend-cli@0.1.0.0 · setimp.bend:61

import Base

61def fmt.ext(m: Maybe<&2, String>, +path: String) -> Result<&2, &2, String, String>:
62  match m:
63    case Some{f}:
64      Done{f}
65    case None{}:
66      Fail{"cannot tell the format of '" ++ path ++ "' from its extension; pass --format json|yaml|toon|csv"}