Struct HistoryManager 

pub struct HistoryManager { /* private fields */ }

Manager for undo/redo history.

Maintains dual stacks for undo and redo operations with configurable memory and depth limits.

Implementations

impl HistoryManager

pub fn new(config: HistoryConfig) -> Self

Create a new history manager with the given configuration.

pub fn push(&mut self, cmd: Box<dyn UndoableCmd>)

Push a command onto the undo stack.

This clears the redo stack (new branch) and enforces limits. The command is NOT executed - it’s assumed to have already been executed.

pub fn undo(&mut self) -> Option<Result<String, CommandError>>

Undo the last command.

Moves the command from undo stack to redo stack and calls undo().

Returns

• Ok(description) if undo succeeded
• Err(error) if undo failed (command remains on undo stack)
• None if no commands to undo

pub fn redo(&mut self) -> Option<Result<String, CommandError>>

Redo the last undone command.

Moves the command from redo stack to undo stack and calls redo().

Returns

• Ok(description) if redo succeeded
• Err(error) if redo failed (command remains on redo stack)
• None if no commands to redo

pub fn can_undo(&self) -> bool

Check if undo is available.

pub fn can_redo(&self) -> bool

Check if redo is available.

pub fn undo_depth(&self) -> usize

Get the undo stack depth.

pub fn redo_depth(&self) -> usize

Get the redo stack depth.

pub fn undo_descriptions(&self, limit: usize) -> Vec<&str>

Get descriptions for undo commands (most recent first).

pub fn redo_descriptions(&self, limit: usize) -> Vec<&str>

Get descriptions for redo commands (most recent first).

pub fn next_undo_description(&self) -> Option<&str>

Get the description of the next undo command.

pub fn next_redo_description(&self) -> Option<&str>

Get the description of the next redo command.

pub fn memory_usage(&self) -> usize

Get total memory usage in bytes.

pub fn config(&self) -> &HistoryConfig

Get the current configuration.

pub fn clear(&mut self)

Clear all history (both undo and redo).

Trait Implementations

impl Debug for HistoryManager

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

Formats the value using the given formatter.

impl Default for HistoryManager

fn default() -> Self

Returns the “default value” for a type.