def env

shake@0.7.0.0 · src/cli.bend:194

import Base

194# this argument, falling back to the env var `var` (clap's `.env`)
195def env(aa: Arg, +var: String) -> Arg:
196  Arg{+n, +s, +l, kk, +h, +r, Fallback{_e, dd}, cs} = aa
197  Arg{n, s, l, kk, h, r, Fallback{Some{var}, dd}, cs}