Setimp.pick_format: def of cswap-bend-cli@0.1.0.0
Import: import cswap-bend-cli@0.1.0.0/setimp.bend as Setimp
Lines 68-74 of cswap-bend-cli@0.1.0.0/setimp.bend: https://jend.leeeet.dev/read.txt?path=cswap-bend-cli@0.1.0.0/setimp.bend&start_line=68&end_line=74

import Base

# `--format NAME` when given, else the file's extension.
def pick_format(explicit: Maybe<&2, String>, +path: String) -> Result<&2, &2, String, String>:
  match explicit:
    case Some{+n}:
      fmt.named(known_name(n), n)
    case None{}:
      fmt.ext(known_name(ext_of(path)), path)

Uses (7):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Result
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=cswap-bend-cli@0.1.0.0/setimp.bend&name=ext_of
  https://jend.leeeet.dev/definition.txt?path=cswap-bend-cli@0.1.0.0/setimp.bend&name=fmt.ext
  https://jend.leeeet.dev/definition.txt?path=cswap-bend-cli@0.1.0.0/setimp.bend&name=fmt.named
  https://jend.leeeet.dev/definition.txt?path=cswap-bend-cli@0.1.0.0/setimp.bend&name=known_name