Eliminate ToFoldPoint trait

Just make it a method on FoldMap

crates/editor/src/display_map.rs

@@ -6,7 +6,7 @@ mod wrap_map;
 use crate::{Anchor, MultiBuffer, MultiBufferSnapshot, ToOffset, ToPoint};
 use block_map::{BlockMap, BlockPoint};
 use collections::{HashMap, HashSet};
-use fold_map::{FoldMap, ToFoldPoint as _};
+use fold_map::FoldMap;
 use gpui::{fonts::FontId, Entity, ModelContext, ModelHandle};
 use language::{Point, Subscription as BufferSubscription};
 use std::ops::Range;
@@ -200,7 +200,7 @@ impl DisplaySnapshot {
 
     pub fn prev_line_boundary(&self, mut point: Point) -> (Point, DisplayPoint) {
         loop {
-            let mut fold_point = point.to_fold_point(&self.folds_snapshot, Bias::Left);
+            let mut fold_point = self.folds_snapshot.to_fold_point(point, Bias::Left);
             *fold_point.column_mut() = 0;
             point = fold_point.to_buffer_point(&self.folds_snapshot);
 
@@ -216,7 +216,7 @@ impl DisplaySnapshot {
 
     pub fn next_line_boundary(&self, mut point: Point) -> (Point, DisplayPoint) {
         loop {
-            let mut fold_point = point.to_fold_point(&self.folds_snapshot, Bias::Right);
+            let mut fold_point = self.folds_snapshot.to_fold_point(point, Bias::Right);
             *fold_point.column_mut() = self.folds_snapshot.line_len(fold_point.row());
             point = fold_point.to_buffer_point(&self.folds_snapshot);
 
@@ -231,7 +231,7 @@ impl DisplaySnapshot {
     }
 
     fn point_to_display_point(&self, point: Point, bias: Bias) -> DisplayPoint {
-        let fold_point = point.to_fold_point(&self.folds_snapshot, bias);
+        let fold_point = self.folds_snapshot.to_fold_point(point, bias);
         let tab_point = self.tabs_snapshot.to_tab_point(fold_point);
         let wrap_point = self.wraps_snapshot.from_tab_point(tab_point);
         let block_point = self.blocks_snapshot.to_block_point(wrap_point);

crates/editor/src/display_map/fold_map.rs

@@ -12,10 +12,6 @@ use std::{
 };
 use sum_tree::{Bias, Cursor, FilterCursor, SumTree};
 
-pub trait ToFoldPoint {
-    fn to_fold_point(&self, snapshot: &FoldSnapshot, bias: Bias) -> FoldPoint;
-}
-
 #[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq)]
 pub struct FoldPoint(pub super::Point);
 
@@ -75,26 +71,6 @@ impl FoldPoint {
     }
 }
 
-impl ToFoldPoint for Point {
-    fn to_fold_point(&self, snapshot: &FoldSnapshot, bias: Bias) -> FoldPoint {
-        let mut cursor = snapshot.transforms.cursor::<(Point, FoldPoint)>();
-        cursor.seek(self, Bias::Right, &());
-        if cursor.item().map_or(false, |t| t.is_fold()) {
-            if bias == Bias::Left || *self == cursor.start().0 {
-                cursor.start().1
-            } else {
-                cursor.end(&()).1
-            }
-        } else {
-            let overshoot = *self - cursor.start().0;
-            FoldPoint(cmp::min(
-                cursor.start().1 .0 + overshoot,
-                cursor.end(&()).1 .0,
-            ))
-        }
-    }
-}
-
 pub struct FoldMapWriter<'a>(&'a mut FoldMap);
 
 impl<'a> FoldMapWriter<'a> {
@@ -554,6 +530,24 @@ impl FoldSnapshot {
         summary
     }
 
+    pub fn to_fold_point(&self, point: Point, bias: Bias) -> FoldPoint {
+        let mut cursor = self.transforms.cursor::<(Point, FoldPoint)>();
+        cursor.seek(&point, Bias::Right, &());
+        if cursor.item().map_or(false, |t| t.is_fold()) {
+            if bias == Bias::Left || point == cursor.start().0 {
+                cursor.start().1
+            } else {
+                cursor.end(&()).1
+            }
+        } else {
+            let overshoot = point - cursor.start().0;
+            FoldPoint(cmp::min(
+                cursor.start().1 .0 + overshoot,
+                cursor.end(&()).1 .0,
+            ))
+        }
+    }
+
     pub fn len(&self) -> FoldOffset {
         FoldOffset(self.transforms.summary().output.bytes)
     }
@@ -1356,7 +1350,7 @@ mod tests {
                 let buffer_point = fold_point.to_buffer_point(&snapshot);
                 let buffer_offset = buffer_point.to_offset(&buffer_snapshot);
                 assert_eq!(
-                    buffer_point.to_fold_point(&snapshot, Right),
+                    snapshot.to_fold_point(buffer_point, Right),
                     fold_point,
                     "{:?} -> fold point",
                     buffer_point,
@@ -1428,10 +1422,8 @@ mod tests {
             }
 
             for fold_range in map.merged_fold_ranges() {
-                let fold_point = fold_range
+                let fold_point =
-                    .start
+                    snapshot.to_fold_point(fold_range.start.to_point(&buffer_snapshot), Right);
-                    .to_point(&buffer_snapshot)
-                    .to_fold_point(&snapshot, Right);
                 assert!(snapshot.is_line_folded(fold_point.row()));
             }
 

crates/editor/src/display_map/tab_map.rs

@@ -1,4 +1,4 @@
-use super::fold_map::{self, FoldEdit, FoldPoint, FoldSnapshot, ToFoldPoint};
+use super::fold_map::{self, FoldEdit, FoldPoint, FoldSnapshot};
 use crate::MultiBufferSnapshot;
 use language::{rope, Chunk};
 use parking_lot::Mutex;
@@ -201,10 +201,6 @@ impl TabSnapshot {
         TabPoint::new(input.row(), expanded as u32)
     }
 
-    pub fn from_point(&self, point: Point, bias: Bias) -> TabPoint {
-        self.to_tab_point(point.to_fold_point(&self.fold_snapshot, bias))
-    }
-
     pub fn to_fold_point(&self, output: TabPoint, bias: Bias) -> (FoldPoint, usize, usize) {
         let chars = self.fold_snapshot.chars_at(FoldPoint::new(output.row(), 0));
         let expanded = output.column() as usize;
@@ -217,6 +213,10 @@ impl TabSnapshot {
         )
     }
 
+    pub fn from_point(&self, point: Point, bias: Bias) -> TabPoint {
+        self.to_tab_point(self.fold_snapshot.to_fold_point(point, bias))
+    }
+
     pub fn to_point(&self, point: TabPoint, bias: Bias) -> Point {
         self.to_fold_point(point, bias)
             .0