diff options
Diffstat (limited to 'helix-core/src/history.rs')
| -rw-r--r-- | helix-core/src/history.rs | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/helix-core/src/history.rs b/helix-core/src/history.rs index b53c01fe..4b1c8d3b 100644 --- a/helix-core/src/history.rs +++ b/helix-core/src/history.rs @@ -1,4 +1,4 @@ -use crate::{ChangeSet, Rope, State, Transaction}; +use crate::{Assoc, ChangeSet, Range, Rope, State, Transaction}; use once_cell::sync::Lazy; use regex::Regex; use std::num::NonZeroUsize; @@ -133,6 +133,32 @@ impl History { Some(&self.revisions[last_child.get()].transaction) } + // Get the position of last change + pub fn last_edit_pos(&self) -> Option<usize> { + if self.current == 0 { + return None; + } + let current_revision = &self.revisions[self.current]; + let primary_selection = current_revision + .inversion + .selection() + .expect("inversion always contains a selection") + .primary(); + let (_from, to, _fragment) = current_revision + .transaction + .changes_iter() + // find a change that matches the primary selection + .find(|(from, to, _fragment)| Range::new(*from, *to).overlaps(&primary_selection)) + // or use the first change + .or_else(|| current_revision.transaction.changes_iter().next()) + .unwrap(); + let pos = current_revision + .transaction + .changes() + .map_pos(to, Assoc::After); + Some(pos) + } + fn lowest_common_ancestor(&self, mut a: usize, mut b: usize) -> usize { use std::collections::HashSet; let mut a_path_set = HashSet::new(); @@ -256,7 +282,7 @@ impl History { } /// Whether to undo by a number of edits or a duration of time. -#[derive(Debug, PartialEq)] +#[derive(Debug, PartialEq, Clone, Copy)] pub enum UndoKind { Steps(usize), TimePeriod(std::time::Duration), |