Function vault_revision_hash

atomic-cli/src/commands/vault/context.rs:684–690

Identify the exact stored knowledge revision, not only its Markdown body. Length-prefixing keeps the hash input unambiguous while preserving the raw stored frontmatter as part of the revision contract.

(entry: &VaultEntry)

/// Length-prefixing keeps the hash input unambiguous while preserving the raw
/// stored frontmatter as part of the revision contract.
fn vault_revision_hash(entry: &VaultEntry) -> String {
    let mut bytes = b"atomic-vault-revision-v1".to_vec();
    append_hash_field(&mut bytes, entry.entry_type.as_str().as_bytes());
    append_hash_field(&mut bytes, entry.frontmatter_json.as_bytes());
    append_hash_field(&mut bytes, &entry.content_bytes);
    Hash::of(&bytes).to_base32()
}

fn append_hash_field(target: &mut Vec<u8>, value: &[u8]) {
    target.extend_from_slice(&(value.len() as u64).to_be_bytes());