From 0338bc10354d1ea491165b3b0f903b3bf9832c52 Mon Sep 17 00:00:00 2001
From: efanhome <canhuanglin@gmail.com>
Date: Fri, 21 Aug 2026 11:19:48 +0800
Subject: [PATCH] fix(tui): truncate Chinese/multibyte chars without panic
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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The old implementation sliced by byte index (&s[..max]), which cut inside
multibyte UTF-8 characters like 性 (bytes 38..41) and panicked at runtime.

Use unicode-width to compute display width per character and break on
char boundaries instead.

- Add unicode-width 0.2 dependency
- Rewrite truncate() with char_indices() + UnicodeWidthChar
- Use UnicodeWidthStr for width calculation
---
 Cargo.lock    |  1 +
 Cargo.toml    |  1 +
 src/tui/ui.rs | 14 ++++++++++----
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index eb3d28b..9ad5c0e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -809,6 +809,7 @@ dependencies = [
  "serde_json",
  "tempfile",
  "toml",
+ "unicode-width 0.2.0",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index d382369..5678652 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,6 +21,7 @@ name = "disky"
 path = "src/main.rs"
 
 [dependencies]
+unicode-width = "0.2"
 jwalk = "0.8"
 duckdb = { version = "1.1", features = ["bundled"] }
 clap = { version = "4", features = ["derive"] }
diff --git a/src/tui/ui.rs b/src/tui/ui.rs
index a4a74b4..13c9e27 100644
--- a/src/tui/ui.rs
+++ b/src/tui/ui.rs
@@ -7,6 +7,7 @@ use ratatui::{
     widgets::{Block, Borders, List, ListItem, ListState, Paragraph},
     Frame,
 };
+use unicode_width::{UnicodeWidthChar, UnicodeWidthStr};
 
 pub fn render(frame: &mut Frame, app: &App, list_state: &mut ListState) {
     let area = frame.area();
@@ -163,9 +164,14 @@ fn size_bar(size: i64, max: i64, width: usize) -> String {
 }
 
 fn truncate(s: &str, max: usize) -> String {
-    if s.len() <= max {
-        s.to_string()
-    } else {
-        format!("{}…", &s[..max.saturating_sub(1)])
+    let max = max.saturating_sub(1); // reserve 1 column for '…'
+    let mut width = 0;
+    for (byte_i, ch) in s.char_indices() {
+        let ch_w = ch.width().unwrap_or(0);
+        if width + ch_w > max {
+            return format!("{}…", &s[..byte_i]);
+        }
+        width += ch_w;
     }
+    s.to_string()
 }