`--theme auto` results in the fallback to the default theme

[savchenko]

What steps will reproduce the bug?

1. Configure the environment as following:

   BAT_PAGER=less --RAW-CONTROL-CHARS --quit-if-one-screen --mouse
   BAT_STYLE=plain,changes
   BAT_THEME=auto
   BAT_THEME_DARK=neovim-dark
   BAT_THEME_LIGHT=neovim-light
   

2. Launch a dark terminal. I am using foot version 1.26.1 with $TERM set to foot-direct. Here are the colours:
   
   

3. Create a tiny foo.py to test the highlighting:

   def foo(bar: list[int]) -> str:
       baz, *blah = bar
       return f"{baz}-{blah}"
   
   print(foo([1, 2, 3, 4]))

What happens?

1. bat foo.py falls back to the default theme:
   
   

What did you expect to happen instead?

When terminal is dark (also, org.gnome.desktop.interface color-scheme is prefer-dark), I would expect bat to respect the BAT_THEME=auto as per manual. So when the terminal is dark it should be:

And when the terminal is light:

How did you install bat?

GitHub release.

---

bat version and environment

bat 0.25.0

bat has been built without the 'bugreport' feature. The '--diagnostic' option is not available.

[keith-hall]

The release notes for bat v0.26 mention that this bug was fixed in that version - probably you just need to upgrade 🙂

[hdp]

I'm having exactly this problem with bat 0.26.1 installed via homebrew

BAT_CACHE_PATH=<not set>
BAT_CONFIG_PATH=<not set>
BAT_OPTS=<not set>
BAT_PAGER=<not set>
BAT_PAGING=<not set>
BAT_STYLE=changes,grid,header-filename,snip
BAT_TABS=<not set>
BAT_THEME=<not set>
COLORTERM=<not set>
LANG=en_US.UTF-8
LC_ALL=<not set>
LESS=-R
MANPAGER=<not set>
NO_COLOR=<not set>
PAGER=bat
SHELL=/bin/zsh
TERM=tmux-256color
XDG_CACHE_HOME=<not set>
XDG_CONFIG_HOME=<not set>

Note these don't show up in bat --diagnostic despite being in my environment. (Putting --theme-dark=... etc. in my config file doesn't change the behavior shown below.)

BAT_THEME_LIGHT=Kanagawa Lotus
BAT_THEME_DARK=Kanagawa Wave

Running cat foo.py:

Got:

Expected:

(I have to run cat --theme 'Kanagawa Wave' foo.py to get this result)