Multipart.meta.line: def of bend-kit-multipart@0.3.0.0
Import: import bend-kit-multipart@0.3.0.0/multipart.bend as Multipart
Lines 454-460 of bend-kit-multipart@0.3.0.0/multipart.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-multipart@0.3.0.0/multipart.bend&start_line=454&end_line=460

import Base

# Header block to a Head (RFC 7578 §4.2, §4.4). Other headers are ignored (§4.8).
def meta.line(r: String & String, st: Maybe<&2, String> & Maybe<&2, String>) -> Maybe<&2, String> & Maybe<&2, String>:
  (n, v) = r
  (cd, ct) = st
  +key = String.to_lower(String.trim(n))
  +val = String.trim(v)
  (Bool.pick(Maybe<&2, String>, String.eq(key, "content-disposition"), Some{val}, cd), Bool.pick(Maybe<&2, String>, String.eq(key, "content-type"), Some{val}, ct))

Uses (8):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.pick
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.eq
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.to_lower
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.trim