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Class: Kward::PromptInterface::EditorUndoHistory

Inherits:
Object
  • Object
show all
Defined in:
lib/kward/prompt_interface/editor/undo_history.rb

Overview

Bounded undo/redo history for editor buffer snapshots.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(limit: 100, undo_stack: [], redo_stack: []) ⇒ EditorUndoHistory

Returns a new instance of EditorUndoHistory.



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# File 'lib/kward/prompt_interface/editor/undo_history.rb', line 9

def initialize(limit: 100, undo_stack: [], redo_stack: [])
  @limit = limit
  @undo_stack = undo_stack
  @redo_stack = redo_stack
end

Instance Attribute Details

#redo_stack ⇒ Object (readonly)

Returns the value of attribute redo_stack.



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# File 'lib/kward/prompt_interface/editor/undo_history.rb', line 7

def redo_stack
  @redo_stack
end

#undo_stack ⇒ Object (readonly)

Returns the value of attribute undo_stack.



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# File 'lib/kward/prompt_interface/editor/undo_history.rb', line 7

def undo_stack
  @undo_stack
end

Instance Method Details

#push(snapshot) ⇒ Object 



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# File 'lib/kward/prompt_interface/editor/undo_history.rb', line 15

def push(snapshot)
  @undo_stack << snapshot
  trim(@undo_stack)
  @redo_stack.clear
end

#redo(current_snapshot) ⇒ Object 



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# File 'lib/kward/prompt_interface/editor/undo_history.rb', line 30

def redo(current_snapshot)
  snapshot = @redo_stack.pop
  return nil unless snapshot

  @undo_stack << current_snapshot
  trim(@undo_stack)
  snapshot
end

#undo(current_snapshot) ⇒ Object 



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# File 'lib/kward/prompt_interface/editor/undo_history.rb', line 21

def undo(current_snapshot)
  snapshot = @undo_stack.pop
  return nil unless snapshot

  @redo_stack << current_snapshot
  trim(@redo_stack)
  snapshot
end