Struct Journal 

pub struct Journal {
    pub entries: Vec<JournalEntry>,
    pub leaf_id: Option<String>,
}

Append-only journal with a leafId cursor. The tree projection is derived root→leaf; moving leaf_id branches without rewriting history.

Fields

entries: Vec<JournalEntry>

leaf_id: Option<String>

Active position. None before the header is appended.

Implementations

impl Journal

pub fn new() -> Self

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn append(&mut self, kind: impl Into<String>, payload: Value) -> String

Append a new entry as a child of the current leaf. Returns the new id.

pub fn branch_to(&mut self, target: &str) -> bool

Branch: move leaf_id to an existing ancestor without rewriting. Returns false when target is not found.

pub fn active_path(&self) -> Vec<&JournalEntry>

Project the active path root→leaf as a slice of entries in order.

pub fn get(&self, id: &str) -> Option<&JournalEntry>

Find entry by id.

Trait Implementations

impl Clone for Journal

fn clone(&self) -> Journal

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Journal

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Journal

fn default() -> Journal

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Journal

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Journal

fn eq(&self, other: &Journal) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for Journal

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Journal