multibytes characters in file path are not taken into account when wrapping the header, which leads to bat crashing

[vejkse]

What steps will reproduce the bug?

1. Run touch /tmp/A—B가, where ‘—’ is a multibyte UTF-8 character and ’가’ is a multibyte double-width CJK character.
2. Run bat --terminal-width=30 /tmp/A—B가.

What happens?

bat crashes:

thread 'main' panicked at /usr/src/debug/rust/rustc-1.84.0-src/library/core/src/str/mod.rs:648:21:
byte index 21 is not a char boundary; it is inside '가' (bytes 20..23) of `File: /tmp/A—B가   <EMPTY>`
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
───────┬──────────────────────

Different widths give different results:

• with 26 or 27, it crashes with the boundary inside ‘—’;
• with 21 or 22, it doesn’t crash but ANSI colour codes are broken: 146;131;116m│ m <EMPTY>.

What did you expect to happen instead?

Depending on the width, either not crashing or not breaking ANSI colour codes.

How did you install bat?

I’m using the latest ArchLinux package.

---

bat version and environment

Software version

bat 0.25.0 (v0.25.0-modified)

Operating system

Linux 6.13.5-arch1-1

Command-line

bat --diagnostic

Environment variables

BAT_CACHE_PATH=<not set>
BAT_CONFIG_PATH=<not set>
BAT_OPTS=<not set>
BAT_PAGER=<not set>
BAT_PAGING=<not set>
BAT_STYLE=<not set>
BAT_TABS=<not set>
BAT_THEME=<not set>
COLORTERM=truecolor
LANG=en_US.UTF-8
LC_ALL=<not set>
LESS=' --RAW-CONTROL-CHARS --tilde --incsearch --ignore-case --clear-screen '
MANPAGER='nvim +Man'\!''
NO_COLOR=<not set>
PAGER=less
SHELL=/bin/bash
TERM=alacritty
XDG_CACHE_HOME=/home/vejkse/.cache
XDG_CONFIG_HOME=/home/vejkse/.config

System Config file

Could not read contents of '/etc/bat/config': No such file or directory (os error 2).

Config file

--theme=gruvbox-dark

Custom assets metadata

Could not read contents of '/home/vejkse/.cache/bat/metadata.yaml': No such file or directory (os error 2).

Custom assets

'/home/vejkse/.cache/bat' not found

Compile time information

• Profile: release
• Target triple: x86_64-unknown-linux-gnu
• Family: unix
• OS: linux
• Architecture: x86_64
• Pointer width: 64
• Endian: little
• CPU features: fxsr,sse,sse2
• Host: x86_64-unknown-linux-gnu

Less version

> less --version
less 668 (PCRE2 regular expressions)
Copyright (C) 1984-2024  Mark Nudelman

less comes with NO WARRANTY, to the extent permitted by law.
For information about the terms of redistribution,
see the file named README in the less distribution.
Home page: https://greenwoodsoftware.com/less

[donovanglover]

Had this issue for a while now on NixOS. Thanks for reporting it!