Frame.blank.find: def of cswap-bend-cli@0.1.0.0
Import: import cswap-bend-cli@0.1.0.0/frame.bend as Frame
Lines 25-33 of cswap-bend-cli@0.1.0.0/frame.bend: https://jend.leeeet.dev/read.txt?path=cswap-bend-cli@0.1.0.0/frame.bend&start_line=25&end_line=33

import Base

# Index of the LF that ends a blank line: an LF whose previous line break was
# an LF too (CR before either is ignored). `prev`: the last significant
# character was an LF (true at the start, so leading blank lines are cut).
def blank.find(s: String, +n: Nat, +prev: Bool) -> Maybe<&2, Nat>:
  match s:
    case SNil{}:
      None{}
    case SCon{Chr{+c}, t}:
      nl.pick(prev && U32.is_eq(c, 10), n, blank.find(t, Nat.add(n, 1n), Bool.pick(Bool, U32.is_eq(c, 13), prev, U32.is_eq(c, 10))))

Uses (10):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.pick
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Char
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_eq
  https://jend.leeeet.dev/definition.txt?path=cswap-bend-cli@0.1.0.0/frame.bend&name=nl.pick