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{ config, pkgs, lib, ... }:
with lib;
let
cfg = config.fonts.fontconfig;
fcBool = x: "<bool>" + (boolToString x) + "</bool>";
# back-supported fontconfig version and package
# version is used for font cache generation
supportVersion = "210";
supportPkg = pkgs."fontconfig_${supportVersion}";
# latest fontconfig version and package
# version is used for configuration folder name, /etc/fonts/VERSION/
# note: format differs from supportVersion and can not be used with makeCacheConf
latestVersion = pkgs.fontconfig.configVersion;
latestPkg = pkgs.fontconfig;
# supported version fonts.conf
supportFontsConf = pkgs.makeFontsConf { fontconfig = supportPkg; fontDirectories = config.fonts.fonts; };
# configuration file to read fontconfig cache
# version dependent
# priority 0
cacheConfSupport = makeCacheConf { version = supportVersion; };
cacheConfLatest = makeCacheConf {};
# generate the font cache setting file for a fontconfig version
# use latest when no version is passed
makeCacheConf = { version ? null }:
let
fcPackage = if version == null
then "fontconfig"
else "fontconfig_${version}";
makeCache = fontconfig: pkgs.makeFontsCache { inherit fontconfig; fontDirectories = config.fonts.fonts; };
cache = makeCache pkgs.${fcPackage};
cache32 = makeCache pkgs.pkgsi686Linux.${fcPackage};
in
pkgs.writeText "fc-00-nixos-cache.conf" ''
<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
<fontconfig>
<!-- Font directories -->
${concatStringsSep "\n" (map (font: "<dir>${font}</dir>") config.fonts.fonts)}
<!-- Pre-generated font caches -->
<cachedir>${cache}</cachedir>
${optionalString (pkgs.stdenv.isx86_64 && cfg.cache32Bit) ''
<cachedir>${cache32}</cachedir>
''}
</fontconfig>
'';
# local configuration file
localConf = pkgs.writeText "fc-local.conf" cfg.localConf;
# rendering settings configuration files
# priority 10
hintingConf = pkgs.writeText "fc-10-hinting.conf" ''
<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
<fontconfig>
<!-- Default rendering settings -->
<match target="pattern">
<edit mode="append" name="hinting">
${fcBool cfg.hinting.enable}
</edit>
<edit mode="append" name="autohint">
${fcBool cfg.hinting.autohint}
</edit>
<edit mode="append" name="hintstyle">
<const>hintslight</const>
</edit>
</match>
</fontconfig>
'';
antialiasConf = pkgs.writeText "fc-10-antialias.conf" ''
<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
<fontconfig>
<!-- Default rendering settings -->
<match target="pattern">
<edit mode="append" name="antialias">
${fcBool cfg.antialias}
</edit>
</match>
</fontconfig>
'';
subpixelConf = pkgs.writeText "fc-10-subpixel.conf" ''
<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
<fontconfig>
<!-- Default rendering settings -->
<match target="pattern">
<edit mode="append" name="rgba">
<const>${cfg.subpixel.rgba}</const>
</edit>
<edit mode="append" name="lcdfilter">
<const>lcd${cfg.subpixel.lcdfilter}</const>
</edit>
</match>
</fontconfig>
'';
dpiConf = pkgs.writeText "fc-11-dpi.conf" ''
<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
<fontconfig>
<match target="pattern">
<edit name="dpi" mode="assign">
<double>${toString cfg.dpi}</double>
</edit>
</match>
</fontconfig>
'';
# default fonts configuration file
# priority 52
defaultFontsConf =
let genDefault = fonts: name:
optionalString (fonts != []) ''
<alias>
<family>${name}</family>
<prefer>
${concatStringsSep ""
(map (font: ''
<family>${font}</family>
'') fonts)}
</prefer>
</alias>
'';
in
pkgs.writeText "fc-52-nixos-default-fonts.conf" ''
<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
<fontconfig>
<!-- Default fonts -->
${genDefault cfg.defaultFonts.sansSerif "sans-serif"}
${genDefault cfg.defaultFonts.serif "serif"}
${genDefault cfg.defaultFonts.monospace "monospace"}
</fontconfig>
'';
# reject Type 1 fonts
# priority 53
rejectType1 = pkgs.writeText "fc-53-nixos-reject-type1.conf" ''
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<!-- Reject Type 1 fonts -->
<selectfont>
<rejectfont>
<pattern>
<patelt name="fontformat"><string>Type 1</string></patelt>
</pattern>
</rejectfont>
</selectfont>
</fontconfig>
'';
# The configuration to be included in /etc/font/
penultimateConf = pkgs.runCommand "fontconfig-penultimate-conf" {
preferLocalBuild = true;
} ''
support_folder=$out/etc/fonts/conf.d
latest_folder=$out/etc/fonts/${latestVersion}/conf.d
mkdir -p $support_folder
mkdir -p $latest_folder
# fonts.conf
ln -s ${supportFontsConf} $support_folder/../fonts.conf
ln -s ${latestPkg.out}/etc/fonts/fonts.conf \
$latest_folder/../fonts.conf
# fontconfig-penultimate various configuration files
ln -s ${pkgs.fontconfig-penultimate}/etc/fonts/conf.d/*.conf \
$support_folder
ln -s ${pkgs.fontconfig-penultimate}/etc/fonts/conf.d/*.conf \
$latest_folder
ln -s ${cacheConfSupport} $support_folder/00-nixos-cache.conf
ln -s ${cacheConfLatest} $latest_folder/00-nixos-cache.conf
rm $support_folder/10-antialias.conf $latest_folder/10-antialias.conf
ln -s ${antialiasConf} $support_folder/10-antialias.conf
ln -s ${antialiasConf} $latest_folder/10-antialias.conf
rm $support_folder/10-hinting.conf $latest_folder/10-hinting.conf
ln -s ${hintingConf} $support_folder/10-hinting.conf
ln -s ${hintingConf} $latest_folder/10-hinting.conf
${optionalString cfg.useEmbeddedBitmaps ''
rm $support_folder/10-no-embedded-bitmaps.conf
rm $latest_folder/10-no-embedded-bitmaps.conf
''}
rm $support_folder/10-subpixel.conf $latest_folder/10-subpixel.conf
ln -s ${subpixelConf} $support_folder/10-subpixel.conf
ln -s ${subpixelConf} $latest_folder/10-subpixel.conf
${optionalString (cfg.dpi != 0) ''
ln -s ${dpiConf} $support_folder/11-dpi.conf
ln -s ${dpiConf} $latest_folder/11-dpi.conf
''}
# 50-user.conf
${optionalString (!cfg.includeUserConf) ''
rm $support_folder/50-user.conf
rm $latest_folder/50-user.conf
''}
# 51-local.conf
rm $latest_folder/51-local.conf
substitute \
${pkgs.fontconfig-penultimate}/etc/fonts/conf.d/51-local.conf \
$latest_folder/51-local.conf \
--replace local.conf /etc/fonts/${latestVersion}/local.conf
# local.conf (indirect priority 51)
${optionalString (cfg.localConf != "") ''
ln -s ${localConf} $support_folder/../local.conf
ln -s ${localConf} $latest_folder/../local.conf
''}
# 52-nixos-default-fonts.conf
ln -s ${defaultFontsConf} $support_folder/52-nixos-default-fonts.conf
ln -s ${defaultFontsConf} $latest_folder/52-nixos-default-fonts.conf
# 53-no-bitmaps.conf
${optionalString cfg.allowBitmaps ''
rm $support_folder/53-no-bitmaps.conf
rm $latest_folder/53-no-bitmaps.conf
''}
${optionalString (!cfg.allowType1) ''
# 53-nixos-reject-type1.conf
ln -s ${rejectType1} $support_folder/53-nixos-reject-type1.conf
ln -s ${rejectType1} $latest_folder/53-nixos-reject-type1.conf
''}
'';
in
{
options = {
fonts = {
fontconfig = {
penultimate = {
enable = mkOption {
type = types.bool;
default = true;
description = ''
Enable fontconfig-penultimate settings to supplement the
NixOS defaults by providing per-font rendering defaults and
metric aliases.
'';
};
};
};
};
};
config = mkIf (config.fonts.fontconfig.enable && config.fonts.fontconfig.penultimate.enable) {
fonts.fontconfig.confPackages = [ penultimateConf ];
};
}
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