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 $fontDirectories parameter.
-->
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:str="http://exslt.org/strings"
extension-element-prefixes="str"
>
<xsl:output method='xml' encoding="UTF-8" doctype-system="fonts.dtd" />
<xsl:param name="fontDirectories" />
<xsl:param name="fontconfig" />
<xsl:template match="/fontconfig">
<fontconfig>
<xsl:copy-of select="child::node()[name() != 'dir' and name() != 'cachedir' and name() != 'include']" />
<include ignore_missing="yes" xml:space="preserve">/etc/fonts/conf.d</include>
<include xml:space="preserve"><xsl:value-of select="$fontconfig" />/etc/fonts/conf.d</include>
<cachedir xml:space="preserve">/var/cache/fontconfig</cachedir>
<cachedir xml:space="preserve">~/.fontconfig</cachedir>
<xsl:for-each select="str:tokenize($fontDirectories)">
<dir><xsl:value-of select="." /></dir>
<xsl:text>&#0010;</xsl:text>
</xsl:for-each>
</fontconfig>
</xsl:template>
</xsl:stylesheet>