nixpkgs/pkgs/development/libraries/fontconfig/make-fonts-conf.xsl

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<?xml version="1.0"?>
<!--
This script copies the original fonts.conf from the fontconfig
distribution, but replaces all <dir> entries with the directories
specified in the $fontDirectories parameter.
-->
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:str="http://exslt.org/strings"
extension-element-prefixes="str"
>
<xsl:output method='xml' encoding="UTF-8" doctype-system="urn:fontconfig:fonts.dtd" />
<xsl:param name="fontDirectories" />
<xsl:template match="/fontconfig">
<fontconfig>
<xsl:apply-templates select="child::node()[name() != 'dir' and name() != 'cachedir' and name() != 'include']" />
<!-- the first cachedir will be used to store the cache -->
<cachedir prefix="xdg">fontconfig</cachedir>
<!-- /var/cache/fontconfig is useful for non-nixos systems -->
<cachedir>/var/cache/fontconfig</cachedir>
<!-- system-wide config -->
<include ignore_missing="yes">/etc/fonts/conf.d</include>
<dir prefix="xdg">fonts</dir>
<xsl:for-each select="str:tokenize($fontDirectories)">
<dir><xsl:value-of select="." /></dir>
<xsl:text>&#0010;</xsl:text>
</xsl:for-each>
<!-- nix user profile -->
<dir>~/.nix-profile/lib/X11/fonts</dir>
<dir>~/.nix-profile/share/fonts</dir>
<!-- FHS paths for non-NixOS platforms -->
<dir>/usr/share/fonts</dir>
<dir>/usr/local/share/fonts</dir>
<!-- nix default profile -->
<dir>/nix/var/nix/profiles/default/lib/X11/fonts</dir>
<dir>/nix/var/nix/profiles/default/share/fonts</dir>
</fontconfig>
</xsl:template>
<!-- New fontconfig >=2.11 doesn't like xml:space added by xsl:copy-of -->
<xsl:template match="node()|@*">
<xsl:copy>
<xsl:apply-templates select="node()|@*[name() != 'xml:space']"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>