clang-format: file style not working since 25.07.1

[PierreBhs]

Summary

After upgrading to the latest Helix version on Arch

pacman -Ss helix
cachyos-extra-znver4/helix 25.07.1-1.1 [installed]
    A post-modern modal text editor
extra/helix 25.07.1-1 [installed: 25.07.1-1.1]
    A post-modern modal text editor

I tried to run :fmt on a .hpp file inside helix and got this error from the logs:

helix_view::document [ERROR] Formatter error: Error reading .clang-format: No such file or directory

even though there is indeed a .clang-format file in my current directory (from where helix was executed).

I downgraded to 24.07-2 and the same command worked with the exact same environment.

Here is my language config:

[[language]]
name = "cpp"
formatter = { command = 'clang-format', args = ['--style=file:.clang-format'] }
auto-format = true
file-types = ["cpp", "hpp", "h", "tpp", "tcc"]

and cpp related stuff:

 helix --health cpp
Configured language servers:
  ✓ clangd: /usr/bin/clangd
Configured debug adapter: lldb-dap
Binary for debug adapter: 'lldb-dap' not found in $PATH
Configured formatter: clang-format
Binary for formatter: /usr/bin/clang-format
Highlight queries: ✓
Textobject queries: ✓
Indent queries: ✓

Running on fish 4.0.2, with kitty 0.42.2

Reproduction Steps

Running :fmt inside a .hpp/.cpp file with clang-format configured to use --style=file:.clang-format'

Platform

Linux

Terminal Emulator

kitty 0.42.2

Installation Method

AUR

Helix Version

25.07.1-1.1

[the-mikedavis]

From the docs it looks like you only need to set --style=file and clang-format will find the .clang-format in the current or parent directories. The change since 24.07 was to execute the formatter in the directory of the current buffer: #12315, so clang-format needs to check parent directories as well as its CWD.