sealmap 0.2.1

Deterministic code maps and sealed diagram contracts for LLM development harnesses: stable symbol ids, signature and body hashes, a seal lockfile checked in CI, and dense Mermaid views
Documentation 
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//! The `sealmap` binary end to end on a scratch repository: sign, verify,
//! seal-check, resolve, stale (with and without `--since`) and
//! `generate --check`.

use std::fs;
use std::path::{Path, PathBuf};
use std::process::{Command, Output};

const ACCOUNTS: &str = "pub struct LedgerAccount { pub balance: i64 }\n\nimpl LedgerAccount {\n    pub fn deposit(&mut self, amount: i64) {\n        self.balance += amount;\n    }\n\n    pub fn withdraw(&mut self, amount: i64) -> bool {\n        self.balance -= amount;\n        self.balance >= 0\n    }\n}\n";

const TOPIC: &str = "---\nid: LED-01\ntitle: Accounts\narea: ledger\n---\nMoney goes in through `sym:cargo ledger . accounts/LedgerAccount#deposit().` and out\nthrough `sym:cargo ledger . accounts/LedgerAccount#withdraw().`.\n";

const DEPOSIT: &str = "sym:cargo ledger . accounts/LedgerAccount#deposit().";

fn scratch(name: &str) -> PathBuf {
    let dir = Path::new(env!("CARGO_TARGET_TMPDIR")).join(name);
    let _ = fs::remove_dir_all(&dir);
    fs::create_dir_all(dir.join("src")).unwrap();
    fs::create_dir_all(dir.join("docs/diagrams/ledger")).unwrap();
    fs::write(dir.join("Cargo.toml"), "[package]\nname = \"ledger\"\n").unwrap();
    fs::write(dir.join("src/lib.rs"), "pub mod accounts;\n").unwrap();
    fs::write(dir.join("src/accounts.rs"), ACCOUNTS).unwrap();
    fs::write(dir.join("docs/diagrams/ledger/01-accounts.md"), TOPIC).unwrap();
    dir
}

/// Stops git searching above the scratch root. Without it, a target directory
/// inside a checkout (as on CI) makes every fixture part of that checkout.
const GIT_CEILING: &str = env!("CARGO_TARGET_TMPDIR");

fn sealmap(dir: &Path, args: &[&str]) -> Output {
    Command::new(env!("CARGO_BIN_EXE_sealmap"))
        .current_dir(dir)
        .env("GIT_CEILING_DIRECTORIES", GIT_CEILING)
        .args(args)
        .output()
        .unwrap()
}

fn code(o: &Output) -> i32 {
    o.status.code().unwrap()
}

fn stdout(o: &Output) -> String {
    String::from_utf8_lossy(&o.stdout).into_owned()
}

fn edit(dir: &Path, file: &str, from: &str, to: &str) {
    let p = dir.join(file);
    let t = fs::read_to_string(&p).unwrap();
    assert!(t.contains(from), "{from}");
    fs::write(p, t.replace(from, to)).unwrap();
}

fn sign(dir: &Path) {
    let o = sealmap(
        dir,
        &["seal", "sign", "LED-01", "--reviewer", "zai:glm-5.3", "--model", "claude:sonnet", "--date", "2026-10-05"],
    );
    assert_eq!(code(&o), 0, "{}", String::from_utf8_lossy(&o.stderr));
}

#[test]
fn sign_then_verify_goes_red_after_a_body_edit() {
    let dir = scratch("sign-verify");
    // Unsealed citations fail the gate before signing.
    assert_eq!(code(&sealmap(&dir, &["verify"])), 1);
    sign(&dir);
    let lock = fs::read_to_string(dir.join("docs/diagrams/seals.lock")).unwrap();
    assert!(lock.contains("id = \"LED-01\"\nfile = \"ledger/01-accounts.md\""), "{lock}");
    assert!(lock.contains("reviewer = \"zai:glm-5.3\""));
    let topic = fs::read_to_string(dir.join("docs/diagrams/ledger/01-accounts.md")).unwrap();
    assert!(topic.contains("area: ledger\nsealed: seals.lock\n---"), "{topic}");

    assert_eq!(code(&sealmap(&dir, &["verify"])), 0);
    assert_eq!(code(&sealmap(&dir, &["seal-check", "LED-01"])), 0);
    assert_eq!(code(&sealmap(&dir, &["seal-check", "LED-09"])), 1);
    // Signing again is idempotent.
    sign(&dir);
    assert_eq!(fs::read_to_string(dir.join("docs/diagrams/seals.lock")).unwrap(), lock);

    edit(&dir, "src/accounts.rs", "self.balance += amount;", "self.balance += amount * 2;");
    let o = sealmap(&dir, &["verify"]);
    assert_eq!(code(&o), 1);
    assert!(stdout(&o).contains(&format!("behaviour         LED-01   {DEPOSIT}")), "{}", stdout(&o));
    let o = sealmap(&dir, &["verify", "--json"]);
    let v: serde_json::Value = serde_json::from_slice(&o.stdout).unwrap();
    assert!(v["findings"].as_array().unwrap().iter().any(|f| f["class"] == "behaviour" && f["symbol"] == DEPOSIT));

    // stale reports it and still exits 0.
    let o = sealmap(&dir, &["stale"]);
    assert_eq!(code(&o), 0);
    assert!(stdout(&o).contains(&format!("LED-01   behaviour  {DEPOSIT}")), "{}", stdout(&o));

    // A lock that is not canonical is a fault even when every seal holds.
    edit(&dir, "src/accounts.rs", "self.balance += amount * 2;", "self.balance += amount;");
    assert_eq!(code(&sealmap(&dir, &["verify"])), 0);
    fs::write(dir.join("docs/diagrams/seals.lock"), format!("{lock}\n")).unwrap();
    let o = sealmap(&dir, &["verify"]);
    assert_eq!(code(&o), 1);
    assert!(stdout(&o).contains("lock-fault"), "{}", stdout(&o));
}

#[test]
fn resolve_prints_span_and_hashes_or_absent() {
    let dir = scratch("resolve");
    let o = sealmap(&dir, &["resolve", DEPOSIT]);
    assert_eq!(code(&o), 0);
    assert!(stdout(&o).starts_with("found src/accounts.rs:4-6\nsig   blake3-16:"), "{}", stdout(&o));
    let o = sealmap(&dir, &["resolve", "--json", DEPOSIT]);
    let v: serde_json::Value = serde_json::from_slice(&o.stdout).unwrap();
    assert_eq!(v["resolution"]["status"], "found");
    assert_eq!(v["resolution"]["span"]["start_line"], 4);

    // After a rename, the lock's sealed body names the candidate.
    sign(&dir);
    edit(&dir, "src/accounts.rs", "fn deposit(", "fn credit(");
    let o = sealmap(&dir, &["resolve", DEPOSIT]);
    assert_eq!(code(&o), 1);
    assert_eq!(stdout(&o), "absent\ncandidate sym:cargo ledger . accounts/LedgerAccount#credit().\n");
    assert_eq!(code(&sealmap(&dir, &["resolve", "not an id"])), 2);
}

#[test]
fn stale_since_a_git_revision_compares_two_trees() {
    if Command::new("git").arg("--version").output().is_err() {
        eprintln!("git not available; skipping");
        return;
    }
    let dir = scratch("stale-since");
    sign(&dir);
    // Change deposit, then commit: that change predates the revision.
    edit(&dir, "src/accounts.rs", "self.balance += amount;", "self.balance += amount + 0;");
    let git = |args: &[&str]| {
        let o = Command::new("git")
            .current_dir(&dir)
            .args(["-c", "user.name=t", "-c", "user.email=t@example.com"])
            .args(args)
            .output()
            .unwrap();
        assert!(o.status.success(), "git {args:?}: {}", String::from_utf8_lossy(&o.stderr));
    };
    git(&["init", "-q"]);
    git(&["add", "-A"]);
    git(&["commit", "-q", "-m", "base"]);
    // Then change withdraw's signature in the working tree.
    edit(&dir, "src/accounts.rs", "-> bool {", "-> i64 {");
    edit(&dir, "src/accounts.rs", "self.balance >= 0", "self.balance");

    let since = stdout(&sealmap(&dir, &["stale", "--since", "HEAD"]));
    assert!(since.contains("contract   sym:cargo ledger . accounts/LedgerAccount#withdraw()."), "{since}");
    assert!(!since.contains(DEPOSIT), "{since}");
    let against_lock = stdout(&sealmap(&dir, &["stale"]));
    assert!(against_lock.contains(DEPOSIT) && against_lock.contains("withdraw"), "{against_lock}");
    // The temporary tree is cleaned up and the checkout is untouched.
    assert_eq!(code(&sealmap(&dir, &["stale", "--since", "no-such-rev"])), 2);
}

#[test]
fn generate_check_compares_with_a_fresh_generation() {
    let dir = scratch("generate-check");
    assert_eq!(code(&sealmap(&dir, &["generate", "--check"])), 1);
    assert!(!dir.join(".sealmap").exists(), "--check writes nothing");
    assert_eq!(code(&sealmap(&dir, &["generate"])), 0);
    assert!(dir.join(".sealmap/src/accounts.rs.md").exists());
    assert_eq!(code(&sealmap(&dir, &["generate", "--check"])), 0);
    edit(&dir, "src/accounts.rs", "self.balance += amount;", "self.balance += amount * 2;");
    let o = sealmap(&dir, &["generate", "--check"]);
    assert_eq!(code(&o), 1);
    assert!(stdout(&o).contains("stale     src/accounts.rs.md"), "{}", stdout(&o));
}

fn git(dir: &Path, args: &[&str]) {
    let o = Command::new("git")
        .current_dir(dir)
        .env("GIT_CEILING_DIRECTORIES", GIT_CEILING)
        .args(["-c", "user.name=t", "-c", "user.email=t@example.com"])
        .args(args)
        .output()
        .unwrap();
    assert!(o.status.success(), "git {args:?}: {}", String::from_utf8_lossy(&o.stderr));
}

fn has_git() -> bool {
    Command::new("git").arg("--version").output().is_ok()
}

/// A second topic citing a symbol of its own, so packs and `--diff` have a
/// choice to make.
const TOPIC2: &str = "---\nid: LED-02\ntitle: Withdrawals\narea: ledger\n---\nOverdrafts are possible: `sym:cargo ledger . accounts/LedgerAccount#withdraw().`.\n";

fn scratch2(name: &str) -> PathBuf {
    let dir = scratch(name);
    fs::write(dir.join("docs/diagrams/ledger/02-withdrawals.md"), TOPIC2).unwrap();
    dir
}

#[test]
fn pack_is_byte_identical_across_runs_and_argument_order() {
    let dir = scratch2("pack-determinism");
    let a = sealmap(&dir, &["pack", "LED-01", "LED-02"]);
    assert_eq!(code(&a), 0, "{}", String::from_utf8_lossy(&a.stderr));
    let b = sealmap(&dir, &["pack", "ledger/02-withdrawals.md", "LED-01", "LED-02"]);
    assert_eq!(a.stdout, b.stdout);
    let text = stdout(&a);
    assert!(text.starts_with("# sealmap-pack 1\n"), "{text}");
    assert!(
        text.contains("\nrevision: unknown\ntopics: LED-01 LED-02\nbudget: none\ndepth: 1\nsource-window: 40 lines\n")
    );
    assert!(text.contains(&format!("==== source LED-01 src/accounts.rs:L4-6 83 bytes {DEPOSIT}\n")), "{text}");
    // To a file: the same bytes.
    assert_eq!(code(&sealmap(&dir, &["pack", "LED-02", "LED-01", "-o", "pack.txt"])), 0);
    assert_eq!(fs::read(dir.join("pack.txt")).unwrap(), a.stdout);
    // Nothing to pack is a usage error.
    assert_eq!(code(&sealmap(&dir, &["pack"])), 2);
    assert_eq!(code(&sealmap(&dir, &["pack", "LED-09"])), 2);
}

#[test]
fn pack_over_budget_refuses_with_sizes_and_shards_on_request() {
    let dir = scratch2("pack-budget");
    let full = stdout(&sealmap(&dir, &["pack", "LED-01", "LED-02", "--budget", "9999"]));
    // The budget is part of the header: keep its width (four digits) the same.
    assert!((1001..=9999).contains(&full.len()), "{}", full.len());
    let budget = (full.len() - 1).to_string();
    let o = sealmap(&dir, &["pack", "LED-01", "LED-02", "--budget", &budget]);
    assert_eq!(code(&o), 1);
    assert!(o.stdout.is_empty(), "nothing is written when refusing");
    let err = String::from_utf8_lossy(&o.stderr);
    assert!(err.contains("1 over the") && err.contains("refusing rather than truncating"), "{err}");
    assert!(err.contains("\nLED-01 ") && err.contains("\nLED-02 ") && err.contains("\nheader "), "{err}");
    let o = sealmap(&dir, &["pack", "LED-01", "LED-02", "--budget", &budget, "--json"]);
    let v: serde_json::Value = serde_json::from_slice(&o.stdout).unwrap();
    assert_eq!(v["error"], "over_budget");
    assert_eq!(v["topics"].as_array().unwrap().len(), 2);

    // --shard splits by topic into numbered files, each within the budget.
    let o = sealmap(&dir, &["pack", "LED-01", "LED-02", "--budget", &budget, "--shard", "-o", "packs"]);
    assert_eq!(code(&o), 0, "{}", String::from_utf8_lossy(&o.stderr));
    let one = fs::read_to_string(dir.join("packs/pack-01.txt")).unwrap();
    let two = fs::read_to_string(dir.join("packs/pack-02.txt")).unwrap();
    assert!(one.contains("\ntopics: LED-01\n") && one.contains("\nshard: 1\n"), "{one}");
    assert!(two.contains("\ntopics: LED-02\n") && two.contains("\nshard: 2\n"), "{two}");
    assert!(one.len() < full.len() && two.len() < full.len());
    // --shard needs a budget and a directory.
    assert_eq!(code(&sealmap(&dir, &["pack", "LED-01", "--shard"])), 2);
}

#[test]
fn pack_diff_selects_topics_whose_cited_symbols_changed_since_a_revision() {
    if !has_git() {
        eprintln!("git not available; skipping");
        return;
    }
    let dir = scratch2("pack-diff");
    git(&dir, &["init", "-q"]);
    git(&dir, &["add", "-A"]);
    git(&dir, &["commit", "-q", "-m", "base"]);
    let head =
        String::from_utf8(Command::new("git").current_dir(&dir).args(["rev-parse", "HEAD"]).output().unwrap().stdout)
            .unwrap();

    // Nothing changed: nothing to pack, and that is not an error.
    let o = sealmap(&dir, &["pack", "--diff", "HEAD"]);
    assert_eq!(code(&o), 0);
    assert!(o.stdout.is_empty());

    // Change deposit only: LED-01 cites it, LED-02 does not.
    edit(&dir, "src/accounts.rs", "self.balance += amount;", "self.balance += amount * 2;");
    let o = sealmap(&dir, &["pack", "--diff", "HEAD"]);
    assert_eq!(code(&o), 0, "{}", String::from_utf8_lossy(&o.stderr));
    let text = stdout(&o);
    assert!(text.contains(&format!("\nrevision: {}+dirty\ndiff: HEAD\ntopics: LED-01\n", head.trim())), "{text}");
    assert!(text.contains("self.balance += amount * 2;"), "the window shows the current code: {text}");
    // Explicit topics join the changed ones.
    let both = stdout(&sealmap(&dir, &["pack", "LED-02", "--diff", "HEAD"]));
    assert!(both.contains("\ntopics: LED-01 LED-02\n"), "{both}");

    // Committed, the change is behind HEAD but not behind HEAD~0's parent.
    git(&dir, &["commit", "-q", "-am", "double deposits"]);
    assert!(stdout(&sealmap(&dir, &["pack", "--diff", "HEAD"])).is_empty());
    let since_base = stdout(&sealmap(&dir, &["pack", "--diff", head.trim()]));
    assert!(since_base.contains("\ntopics: LED-01\n") && !since_base.contains("+dirty"), "{since_base}");
    assert_eq!(code(&sealmap(&dir, &["pack", "--diff", "no-such-rev"])), 2);
}

/// ER `gen X-08`: every `--repo` is loaded under its `NAME/` prefix, so two
/// repositories with one name (or one name nested in another's prefix)
/// silently overwrote each other's files. Such a set is now refused.
#[test]
fn repos_with_clashing_names_are_refused() {
    let a = scratch("repo-clash-a");
    let b = scratch("repo-clash-b");
    edit(&b, "src/accounts.rs", "deposit", "credit");
    let (pa, pb) = (format!("api={}", a.display()), format!("api={}", b.display()));
    let o = sealmap(&a, &["model", "--repo", &pa, "--repo", &pb]);
    assert_eq!(code(&o), 2, "{}", stdout(&o));
    let err = String::from_utf8_lossy(&o.stderr);
    assert!(err.contains("api"), "{err}");
    let nested = format!("api/v2={}", b.display());
    assert_ne!(code(&sealmap(&a, &["model", "--repo", &pa, "--repo", &nested])), 0);

    // The library refuses the same set.
    assert!(sealmap::load_repos(&[("api", a.as_path()), ("api", b.as_path())]).is_err());
    // Distinct names load both.
    let both = sealmap::load_repos(&[("api", a.as_path()), ("web", b.as_path())]).unwrap();
    assert!(both.get_str("api/src/accounts.rs").is_some() && both.get_str("web/src/accounts.rs").is_some());
}