Piping to bat using the builtin pager outputs nothing

[lespea]

What steps will reproduce the bug?

1. cat a file into bat using --pager=builtin
2. notice no output
3. also fails when the file is stdin bat --pager=builtin < README.md
4. notice if you remove --pager=builtin both examples work
5. notice it works if you use bat on the file directly bat --pager=builtin README.md

What happens?

Nothing is output. The exit code is 0 and there are no errors. Tried with a large file and one with just a few lines.

What did you expect to happen instead?

The file is displayed

How did you install bat?

cargo install bat

---

bat version and environment

Software version

bat 0.26.0

Operating system

• OS: macOS 15.6.1 Sequoia
• Kernel: 24.6.0

Command-line

bat --pager=builtin --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=en_US.UTF-8
LESS=<not set>
MANPAGER='sh -c '\''col -bx | bat -l man -p'\'''
NO_COLOR=<not set>
PAGER=<not set>
SHELL=/bin/zsh
TERM=xterm-256color
XDG_CACHE_HOME=/Users/Z001J31/.cache
XDG_CONFIG_HOME=/Users/Z001J31/.config

System Config file

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

Config file

Could not read contents of '/Users/Z001J31/.config/bat/config': No such file or directory (os error 2).

Custom assets metadata

Could not read contents of '/Users/Z001J31/.cache/bat/metadata.yaml': No such file or directory (os error 2).

Custom assets

'/Users/Z001J31/.cache/bat' not found

Compile time information

• Profile: release
• Target triple: aarch64-apple-darwin
• Family: unix
• OS: macos
• Architecture: aarch64
• Pointer width: 64
• Endian: little
• CPU features: aes,bf16,bti,crc,dit,dotprod,dpb,dpb2,fcma,fhm,flagm,fp16,frintts,i8mm,jsconv,lor,lse,neon,paca,p
  acg,pan,pmuv3,ras,rcpc,rcpc2,rdm,sb,sha2,sha3,ssbs,vh
• Host: aarch64-apple-darwin

Less version

Could not run command 'builtin': No such file or directory (os error 2)

[keith-hall]

Thanks for reporting. I see that we also need to teach the diagnostics not to try to execute builtin to get a version number 😅