From 5d14f56fa9822b18107a5a5efac98dfe9d08f8ce Mon Sep 17 00:00:00 2001
From: Blaž Hrastnik
Date: Thu, 3 Mar 2022 17:41:39 +0900
Subject: Reuse visual_coords_at_pos function in view

---
 helix-core/src/position.rs | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

(limited to 'helix-core/src/position.rs')

diff --git a/helix-core/src/position.rs b/helix-core/src/position.rs
index 93362c77..17908d7a 100644
--- a/helix-core/src/position.rs
+++ b/helix-core/src/position.rs
@@ -1,8 +1,9 @@
+use std::borrow::Cow;
+
 use crate::{
     chars::char_is_line_ending,
-    graphemes::{ensure_grapheme_boundary_prev, RopeGraphemes},
+    graphemes::{ensure_grapheme_boundary_prev, grapheme_width, RopeGraphemes},
     line_ending::line_end_char_index,
-    unicode::width::UnicodeWidthChar,
     RopeSlice,
 };
 
@@ -77,14 +78,17 @@ pub fn visual_coords_at_pos(text: RopeSlice, pos: usize, tab_width: usize) -> Po
 
     let line_start = text.line_to_char(line);
     let pos = ensure_grapheme_boundary_prev(text, pos);
-    let col = text
-        .slice(line_start..pos)
-        .chars()
-        .flat_map(|c| match c {
-            '\t' => Some(tab_width),
-            c => UnicodeWidthChar::width(c),
-        })
-        .sum();
+
+    let mut col = 0;
+
+    for grapheme in RopeGraphemes::new(text.slice(line_start..pos)) {
+        if grapheme == "\t" {
+            col += tab_width;
+        } else {
+            let grapheme = Cow::from(grapheme);
+            col += grapheme_width(&grapheme);
+        }
+    }
 
     Position::new(line, col)
 }
-- 
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