021 day02 part1

// AoC 2015 Day 2 Part 1 — wrapping paper (2x3x4 → 58, 1x1x10 → 43; 101).
// PURE .k since 2026-06-12: parse-dims retired by regex NAMED GROUPS — the
// pattern is the branch's payload schema, the destructure takes delivery,
// and the i64 types convert text→int at the splice. The ledger is empty.

import std/io
import std/fs
import std/regex

capture { paper: 0[i64] }
! as acc |> std/fs:read-lines(path: "tests/regression/810_AOC_2015/810_021_day02_part1/input.txt")
    ! line s |> std/regex:match(s)
        | `(?<l>[0-9]+)x(?<w>[0-9]+)x(?<h>[0-9]+)` { l: i64, w: i64, h: i64 } |> captured {
            paper: acc.paper + 2*l*w + 2*w*h + 2*h*l
                + @min(l*w, w*h, h*l)
        }
        | no-match |> std/io:print.ln("BAD LINE {{ s:s }}")
    | done _ |> _
    | failed e |> std/io:print.ln("FAILED {{ e:s }}")
| captured total |> std/io:print.ln("{{ total.paper:d }}")