rustyroad 1.7.4

Rusty Road is a framework written in Rust that is based on Ruby on Rails. It is designed to provide the familiar conventions and ease of use of Ruby on Rails, while also taking advantage of the performance and efficiency of Rust.
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//! Migration identity as recorded in the ledger.

use std::path::Path;

/// Metadata read from one ledger row.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct LedgerRecord {
    pub name: String,
    pub recorded_at: String,
    pub direction: String,
    pub provenance: String,
    pub checksum: Option<String>,
    pub verified_at: Option<String>,
}

/// Returns the ledger identity for a migration directory path.
///
/// The ledger stores the full `<timestamp>-<name>` directory name so ordering is
/// reconstructable from the ledger alone and two migrations sharing a bare name
/// cannot collide.
pub fn ledger_id_for_dir(migration_dir: &str) -> Option<&str> {
    Path::new(migration_dir).file_name()?.to_str()
}

/// Returns the legacy bare-name form of a ledger identity.
///
/// Ledgers written before full-directory-name recording stored `add_columns` rather
/// than `20251114211514-add_columns`. Returns `None` when `ledger_id` carries no
/// timestamp prefix and is therefore already a bare name.
pub(super) fn legacy_bare_name(ledger_id: &str) -> Option<&str> {
    let (prefix, name) = ledger_id.split_once('-')?;
    (!name.is_empty() && prefix.bytes().all(|byte| byte.is_ascii_digit())).then_some(name)
}

/// Returns the human-readable suffix while preserving hyphenated bare names.
pub fn display_name(ledger_id: &str) -> &str {
    legacy_bare_name(ledger_id).unwrap_or(ledger_id)
}

/// Whether full and legacy identities refer to the same migration.
pub fn identities_match(left: &str, right: &str) -> bool {
    left == right || legacy_bare_name(left) == Some(right) || legacy_bare_name(right) == Some(left)
}

/// Returns the latest ledger status for one migration directory identity.
///
/// Full identities are authoritative. A bare-name row is consulted only when no
/// full row exists, matching the execution gate in [`super::is_applied`].
/// Ledger rows must be supplied in oldest-to-newest order.
pub fn latest_status<'a>(
    migration_id: &str,
    rows: &'a [(String, String, String)],
) -> Option<(&'a str, &'a str)> {
    let exact = rows.iter().rev().find(|(name, _, _)| name == migration_id);
    let row = exact.or_else(|| {
        let bare = legacy_bare_name(migration_id)?;
        rows.iter().rev().find(|(name, _, _)| name == bare)
    })?;

    Some((row.1.as_str(), row.2.as_str()))
}

/// Returns the latest rich ledger record for one migration identity.
///
/// Exact timestamped identities remain authoritative over legacy bare-name rows.
pub fn latest_record<'a>(migration_id: &str, rows: &'a [LedgerRecord]) -> Option<&'a LedgerRecord> {
    let exact = rows.iter().rev().find(|record| record.name == migration_id);
    exact.or_else(|| {
        let bare = legacy_bare_name(migration_id)?;
        rows.iter().rev().find(|record| record.name == bare)
    })
}