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plymouth: set custom font #339

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plymouth: set custom font #339

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36 changes: 36 additions & 0 deletions modules/plymouth/nixos.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@

with lib;
with config.lib.stylix.colors;
with config.stylix.fonts;

let
cfg = config.stylix.targets.plymouth;
Expand Down Expand Up @@ -41,6 +42,40 @@ let
" > $themeDir/stylix.plymouth
'';

mkPlymouthFont =
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font:
pkgs.runCommand "${font.package.name}.otf"
{ FONTCONFIG_FILE = pkgs.makeFontsConf { fontDirectories = [ font.package ]; }; }
''
if ! matchingFonts="$(
# sort because otherwise fc-match doesn't print all available formats
${lib.getExe' pkgs.fontconfig "fc-match"} \
--sort \
--format '%{family}|%{file}\n' \
'${font.name}' | \
# Filter for fonts that match the name exactly and only print the path
awk --field-separator '|' '/^${font.name}\|/ { print $2; found=1} END {if (!found) exit 1}'
)"; then
printf 'Font not found: %s' '${font.name}' >&2
exit 1
fi
echo "fonts: '$matchingFonts'" >&2
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Would this not be echoed on every build? Should we remove this debugging statement:

Suggested change
echo "fonts: '$matchingFonts'" >&2

if compatibleFont="$(
# Take the first opentype font or fail when there is none
printf '%s\n' "$matchingFonts" |
grep --max-count 1 --regexp "\.otf$"
)"; then
cp "$compatibleFont" "$out"
else
# If there is no opentype font we take another format and convert it
font=$(printf '%s\n' "$matchingFonts" | head --lines 1)
${lib.getExe' pkgs.fontforge "fontforge"} \
-lang=ff \
-c 'Open($1); Generate($2); Close()' \
"$font" \
"$out"
fi
'';
in {
options.stylix.targets.plymouth = {
enable = config.lib.stylix.mkEnableTarget "the Plymouth boot screen" true;
Expand Down Expand Up @@ -82,5 +117,6 @@ in {
config.boot.plymouth = mkIf cfg.enable {
theme = "stylix";
themePackages = [ theme ];
font = mkPlymouthFont sansSerif;
};
}