[BUG] Terminal font detection fails in alacritty on CachyOS/Niri

[skyhighcaterpie]

Read the FAQ first

• I have checked the FAQ but the issue is not covered

Description

On fresh install CachyOS/Niri, Alacritty fail to show terminal font setting on alacritty.toml.
No matter any change (with default formal), it always shows:
Terminal Font: monospace (12pt, Regular)

The default alacritty.toml write in format like https://wiki.archlinux.org/title/Alacritty
config file = ~/.config/alacritty/alacritty.toml

[font]
size = 12

[font.normal]
family = "UDEV Gothic 35NFLG" 
style = "Regular"

If rewrite above code to format like https://alacritty.org/config-alacritty.html,
Alacritty is able to show correct terminal font on alacritty.toml:
Terminal Font: UDEV Gothic 35NFLG (12pt, Regular)
config file = ~/.config/alacritty/alacritty.toml

[font]
size = 12

normal = { family = "UDEV Gothic 35NFLG", style = "Regular" }

Version used

2.66.0-1.1

Bug prevalence

Always

Regression

Not sure

Installation

Package manager

Package manager

pacman

Screenshots

No response

Configuration

System information

{
    "type": "OS",
    "result": {
      "buildID": "rolling",
      "codename": "",
      "id": "cachyos",
      "idLike": "arch",
      "name": "CachyOS Linux",
      "prettyName": "CachyOS",
      "variant": "",
      "variantID": "",
      "version": "rolling",
      "versionID": ""
    },
    "stat": 0.02354300022125244
  },
  {
    "type": "Version",
    "result": {
      "projectName": "fastfetch",
      "sysName": "Linux",
      "architecture": "x86_64",
      "version": "2.66.0",
      "versionGit": "",
      "cmakeBuiltType": "RelWithDebInfo",
      "compileTime": "Jul 10 2026, 22:19:30",
      "compiler": "gcc 16.1.1",
      "debugMode": false,
      "libc": "glibc 2.43"
    },
    "stat": 0.0007809996604919434
  }

Features built-in

linux-headers 7.1.0
threads
vulkan
wayland
xcb-randr
xrandr
drm
gio
dconf
eet
dbus
imagemagick7
chafa
zlib
sqlite3
egl
glx
opencl
libpulse
libddcutil
libelf
libzfs
va-drm
va-x11
vdpau
System yyjson
linux/videodev2
Embedded wcwidth
Lua 5.5
QuickJS 0.15.1

[CarterLi]

The problem is that fastfetch doesn't embed a full toml parser. With a very loose parser implementation fastfetch can only very limited toml syntax.

I have tried to support both syntax in dd30c82. Please test if it fixes your issue.

[skyhighcaterpie]

Not sure how to install "terminalfont.c" on CachyOS/Niri, I try following path but all not work for alacritty.toml with arch format. (and cannot install from source)

1. No change on local override folder:
   ~/.config/fastfetch/‎src/detection/terminalfont/terminalfont.c

2. No change on system-wide folder:
   /usr/share/fastfetch/src/detection/terminalfont/terminalfont.c

(Do I have to copy any more files to above path?)

3. Fail to install from source:
   git clone https://github.com/fastfetch-cli/fastfetch.git
   cd fastfetch
   mkdir -p build
   cd build
   cmake ..
   cmake --build . --target fastfetch
   [ 14%] Building C object CMakeFiles/libfastfetch.dir/src/detection/codec/codec_vulkan.c.o
   ~/fastfetch/src/detection/codec/codec_vulkan.c:4:14: fatal error: vulkan/vulkan.h: No such file or directory
   4 | #include <vulkan/vulkan.h>
   | ^~~~~~~~~~~~~~~~~
   compilation terminated.

4. No change after install from AUR "fastfetch-git":
   sudo pacman -S fastfetch-git
   (version = 2.65.2.r27.g11d77e0d0-1)

5. No change after install from Arch "fastfetch":
   sudo pacman -S fastfetch
   (version = 2.66.0-1)