ratatui_code_editor/
history.rs

1use std::collections::VecDeque;
2use crate::code::{EditBatch};
3
4pub struct History {
5    index: usize,
6    max_items: usize,
7    edits: VecDeque<EditBatch>,
8}
9
10impl History {
11    pub fn new(max_items: usize) -> Self {
12        Self {
13            index: 0,
14            max_items,
15            edits: VecDeque::new(),
16        }
17    }
18
19    pub fn push(&mut self, batch: EditBatch) {
20        while self.edits.len() > self.index {
21            self.edits.pop_back();
22        }
23
24        if self.edits.len() == self.max_items {
25            self.edits.pop_front();
26            self.index -= 1;
27        }
28
29        self.edits.push_back(batch);
30        self.index += 1;
31    }
32
33    pub fn undo(&mut self) -> Option<EditBatch> {
34        if self.index == 0 {
35            None
36        } else {
37            self.index -= 1;
38            self.edits.get(self.index).cloned()
39        }
40    }
41
42    pub fn redo(&mut self) -> Option<EditBatch> {
43        if self.index >= self.edits.len() {
44            None
45        } else {
46            let batch = self.edits.get(self.index).cloned();
47            self.index += 1;
48            batch
49        }
50    }
51}
ratatui_code_editor/history.rs

ratatui_code_editor/
history.rs
