Dline.lead: def of bend-toon-codec@0.1.0.0
Import: import bend-toon-codec@0.1.0.0/src/dline.bend as Dline
Lines 27-36 of bend-toon-codec@0.1.0.0/src/dline.bend: https://jend.leeeet.dev/read.txt?path=bend-toon-codec@0.1.0.0/src/dline.bend&start_line=27&end_line=36

import Base

# Count the leading spaces and tabs. `live` is true until the first other
# character; the recursion runs to the end of the line but only counts
# while live.
def lead(+s: String, +sp: U32, +tabs: U32, +live: Bool) -> Ld:
  match s:
    case SNil{}:
      Ld{sp, tabs, s}
    case SCon{Chr{c}, t}:
      lead.pick(live && (U32.is_eq(c, 32) || U32.is_eq(c, 9)), s, sp, tabs,
        lead(t, (sp + inc(live && U32.is_eq(c, 32)) : U32), (tabs + inc(live && U32.is_eq(c, 9)) : U32), live && (U32.is_eq(c, 32) || U32.is_eq(c, 9))))

Uses (11):
  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.or
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Char
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_eq
  https://jend.leeeet.dev/definition.txt?path=bend-toon-codec@0.1.0.0/src/dline.bend&name=Ld
  https://jend.leeeet.dev/definition.txt?path=bend-toon-codec@0.1.0.0/src/dline.bend&name=inc
  https://jend.leeeet.dev/definition.txt?path=bend-toon-codec@0.1.0.0/src/dline.bend&name=lead.pick