add delete_by_and_with_selection

helix-core/src/auto_pairs.rs

@@ -110,17 +110,22 @@ impl Default for AutoPairs {
 //   middle of triple quotes, and more exotic pairs like Jinja's {% %}
 
 #[must_use]
-pub fn hook(doc: &Rope, range: &Range, ch: char, pairs: &AutoPairs) -> Option<(Change, Range)> {
+pub fn hook_insert(
+    doc: &Rope,
+    range: &Range,
+    ch: char,
+    pairs: &AutoPairs,
+) -> Option<(Change, Range)> {
     log::trace!("autopairs hook range: {:#?}", range);
 
     if let Some(pair) = pairs.get(ch) {
         if pair.same() {
-            return handle_same(doc, range, pair);
+            return handle_insert_same(doc, range, pair);
         } else if pair.open == ch {
-            return handle_open(doc, range, pair);
+            return handle_insert_open(doc, range, pair);
         } else if pair.close == ch {
             // && char_at pos == close
-            return handle_close(doc, range, pair);
+            return handle_insert_close(doc, range, pair);
         }
     }
 
@@ -243,7 +248,7 @@ fn get_next_range(doc: &Rope, start_range: &Range, len_inserted: usize) -> Range
     Range::new(end_anchor, end_head)
 }
 
-fn handle_open(doc: &Rope, range: &Range, pair: &Pair) -> Option<(Change, Range)> {
+fn handle_insert_open(doc: &Rope, range: &Range, pair: &Pair) -> Option<(Change, Range)> {
     let cursor = range.cursor(doc.slice(..));
     let next_char = doc.get_char(cursor);
     let len_inserted;
@@ -271,7 +276,7 @@ fn handle_open(doc: &Rope, range: &Range, pair: &Pair) -> Option<(Change, Range)
     Some(result)
 }
 
-fn handle_close(doc: &Rope, range: &Range, pair: &Pair) -> Option<(Change, Range)> {
+fn handle_insert_close(doc: &Rope, range: &Range, pair: &Pair) -> Option<(Change, Range)> {
     let cursor = range.cursor(doc.slice(..));
     let next_char = doc.get_char(cursor);
 
@@ -291,7 +296,7 @@ fn handle_close(doc: &Rope, range: &Range, pair: &Pair) -> Option<(Change, Range
 }
 
 /// handle cases where open and close is the same, or in triples ("""docstring""")
-fn handle_same(doc: &Rope, range: &Range, pair: &Pair) -> Option<(Change, Range)> {
+fn handle_insert_same(doc: &Rope, range: &Range, pair: &Pair) -> Option<(Change, Range)> {
     let cursor = range.cursor(doc.slice(..));
     let mut len_inserted = 0;
     let next_char = doc.get_char(cursor);

helix-core/src/transaction.rs

@@ -738,16 +738,6 @@ impl Transaction {
         )
     }
 
-    /// Generate a transaction with a deletion per selection range.
-    /// Compared to using `change_by_selection` directly these ranges may overlap.
-    /// In that case they are merged
-    pub fn delete_by_selection<F>(doc: &Rope, selection: &Selection, f: F) -> Self
-    where
-        F: FnMut(&Range) -> Deletion,
-    {
-        Self::delete(doc, selection.iter().map(f))
-    }
-
     /// Generate a transaction with a change per selection range, which
     /// generates a new selection as well. Each range is operated upon by
     /// the given function and can optionally produce a new range. If none
@@ -801,6 +791,60 @@ impl Transaction {
         transaction.with_selection(Selection::new(end_ranges, selection.primary_index()))
     }
 
+    /// Generate a transaction with a deletion per selection range.
+    /// Compared to using `change_by_selection` directly these ranges may overlap.
+    /// In that case they are merged.
+    pub fn delete_by_selection<F>(doc: &Rope, selection: &Selection, f: F) -> Self
+    where
+        F: FnMut(&Range) -> Deletion,
+    {
+        Self::delete(doc, selection.iter().map(f))
+    }
+
+    /// Generate a transaction with a delete per selection range, which
+    /// generates a new selection as well. Each range is operated upon by
+    /// the given function and can optionally produce a new range. If none
+    /// is returned by the function, that range is mapped through the change
+    /// as usual.
+    ///
+    /// Compared to using `change_by_and_with_selection` directly these ranges
+    /// may overlap. In that case they are merged.
+    pub fn delete_by_and_with_selection<F>(doc: &Rope, selection: &Selection, mut f: F) -> Self
+    where
+        F: FnMut(&Range) -> (Deletion, Option<Range>),
+    {
+        let mut end_ranges = SmallVec::with_capacity(selection.len());
+        let mut offset = 0;
+
+        let transaction = Transaction::delete_by_selection(doc, selection, |start_range| {
+            let ((from, to), end_range) = f(start_range);
+            let change_size = to - from;
+
+            if let Some(end_range) = end_range {
+                let offset_range = Range::new(
+                    end_range.anchor.saturating_sub(offset),
+                    end_range.head.saturating_sub(offset),
+                );
+
+                log::trace!("end range {:?} offset to: {:?}", end_range, offset_range);
+
+                end_ranges.push(offset_range);
+            } else {
+                let changeset = ChangeSet::from_change(doc, (from, to, None));
+                let end_range = start_range.map(&changeset);
+                end_ranges.push(end_range);
+            }
+
+            offset += change_size;
+
+            log::trace!("delete from: {}, to: {}, offset: {}", from, to, offset);
+
+            (from, to)
+        });
+
+        transaction.with_selection(Selection::new(end_ranges, selection.primary_index()))
+    }
+
     /// Insert text at each selection head.
     pub fn insert(doc: &Rope, selection: &Selection, text: Tendril) -> Self {
         Self::change_by_selection(doc, selection, |range| {

helix-term/src/commands.rs

@@ -3868,7 +3868,7 @@ pub mod insert {
             auto_pairs
                 .as_ref()
                 .and_then(|ap| {
-                    auto_pairs::hook(text, range, c, ap)
+                    auto_pairs::hook_insert(text, range, c, ap)
                         .map(|(change, range)| (change, Some(range)))
                         .or(Some(insert_char(*range, c)))
                 })
@@ -4055,11 +4055,13 @@ pub mod insert {
         let indent_width = doc.indent_width();
         let auto_pairs = doc.auto_pairs(cx.editor);
 
-        let transaction =
-            Transaction::delete_by_selection(doc.text(), doc.selection(view.id), |range| {
+        let transaction = Transaction::delete_by_and_with_selection(
+            doc.text(),
+            doc.selection(view.id),
+            |range| {
                 let pos = range.cursor(text);
                 if pos == 0 {
-                    return (pos, pos);
+                    return ((pos, pos), None);
                 }
                 let line_start_pos = text.line_to_char(range.cursor_line(text));
                 // consider to delete by indent level if all characters before `pos` are indent units.
@@ -4067,7 +4069,10 @@ pub mod insert {
                 if !fragment.is_empty() && fragment.chars().all(|ch| ch == ' ' || ch == '\t') {
                     if text.get_char(pos.saturating_sub(1)) == Some('\t') {
                         // fast path, delete one char
-                        (graphemes::nth_prev_grapheme_boundary(text, pos, 1), pos)
+                        (
+                            (graphemes::nth_prev_grapheme_boundary(text, pos, 1), pos),
+                            None,
+                        )
                     } else {
                         let width: usize = fragment
                             .chars()
@@ -4094,7 +4099,7 @@ pub mod insert {
                                 _ => break,
                             }
                         }
-                        (start, pos) // delete!
+                        ((start, pos), None) // delete!
                     }
                 } else {
                     match (
@@ -4109,19 +4114,27 @@ pub mod insert {
                                 && ap.get(_x).unwrap().close == _y =>
                         // delete both autopaired characters
                         {
+                            (
                                 (
                                     graphemes::nth_prev_grapheme_boundary(text, pos, count),
                                     graphemes::nth_next_grapheme_boundary(text, pos, count),
+                                ),
+                                None,
                             )
                         }
                         _ =>
                         // delete 1 char
                         {
-                            (graphemes::nth_prev_grapheme_boundary(text, pos, count), pos)
+                            (
+                                (graphemes::nth_prev_grapheme_boundary(text, pos, count), pos),
+                                None,
+                            )
                         }
                     }
                 }
-            });
+            },
+        );
+
         let (view, doc) = current!(cx.editor);
         doc.apply(&transaction, view.id);
     }