ms-cli 0.8.0

Companion CLI for ms-codec — engrave-friendly BIP-39 entropy backups (the ms1 format).
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//! `ms encode` / `ms split` mstring display-grouping flags (P2).
//! Default = space/5 print-once; `--group-size 0` unbroken; `--separator`.

use assert_cmd::Command;

const Z12: &str = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about";
/// Canonical unbroken ms1 for the 12-word all-zeros phrase (wire canary).
const CANON: &str = "ms10entrsqqqqqqqqqqqqqqqqqqqqqqqqqqqqcj9sxraq34v7f";

fn stdout_of(args: &[&str]) -> String {
    let out = Command::cargo_bin("ms").unwrap().args(args).output().unwrap();
    assert!(
        out.status.success(),
        "command failed: {}",
        String::from_utf8_lossy(&out.stderr)
    );
    String::from_utf8(out.stdout).unwrap()
}

#[test]
fn encode_default_groups_space_5_print_once() {
    let s = stdout_of(&["encode", "--phrase", Z12]);
    // print-once: no blank line / no second copy.
    assert!(!s.contains("\n\n"), "print-once: stdout must not contain \\n\\n; got {s:?}");
    let line = s.lines().next().unwrap();
    assert_eq!(
        line.chars().nth(5),
        Some(' '),
        "expected a space after the first 5 chars; got {line:?}"
    );
    let unbroken: String = line.chars().filter(|c| *c != ' ').collect();
    assert_eq!(unbroken, CANON, "space-stripped grouped form must equal canonical ms1");
}

#[test]
fn encode_unbroken_group_size_0() {
    let s = stdout_of(&["encode", "--phrase", Z12, "--group-size", "0"]);
    let line = s.lines().next().unwrap();
    assert_eq!(line, CANON);
}

#[test]
fn encode_separator_hyphen() {
    let s = stdout_of(&["encode", "--phrase", Z12, "--separator", "hyphen"]);
    let line = s.lines().next().unwrap();
    assert_eq!(line.chars().nth(5), Some('-'), "expected hyphen at idx 5; got {line:?}");
}

#[test]
fn encode_rejects_bad_separator() {
    // ms maps clap parse errors to exit 64 (main.rs).
    Command::cargo_bin("ms")
        .unwrap()
        .args(["encode", "--phrase", Z12, "--separator", "bogus"])
        .assert()
        .code(64);
}

#[test]
fn split_grouped_default_labels_on_stderr() {
    // Default-grouped split: stdout = N grouped share lines; labels → stderr.
    let out = Command::cargo_bin("ms")
        .unwrap()
        .args(["split", "--phrase", Z12, "-k", "2", "-n", "3"])
        .output()
        .unwrap();
    assert!(out.status.success());
    let stdout = String::from_utf8(out.stdout).unwrap();
    let stderr = String::from_utf8(out.stderr).unwrap();
    let lines: Vec<&str> = stdout.lines().filter(|l| !l.is_empty()).collect();
    assert_eq!(lines.len(), 3, "stdout = exactly 3 share lines; got {stdout:?}");
    for l in &lines {
        assert!(l.starts_with("ms1"), "share line: {l:?}");
        assert!(l.contains(' '), "default-grouped share must contain a space: {l:?}");
    }
    assert!(!stdout.contains("share "), "labels must NOT be on stdout; got {stdout:?}");
    assert!(stderr.contains("share 1 of 3"), "label on stderr; got {stderr:?}");
}