Implemented page categorization functionality

* expanded "02_data/pages.xsl" transformation to include pages in subfolders
* "03_meta/categories.xsl" transformation generates a categorized view of all pages simmilar to the one provided for tags by "03_meta/tags.xsl"
* "99_result/category/category.xsl" transformation generates category overview pages
* added basic project related pages inside the "projects" category

1 files changed, 45 insertions, 0 deletions

diff --git a/source/03_meta/categories.xsl b/source/03_meta/categories.xsl
new file mode 100644
index 0000000..a0b1a41
--- /dev/null
+++ b/source/03_meta/categories.xsl
@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xsl:stylesheet
+	version="1.0"
+	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+	xmlns:xalan="http://xml.apache.org/xalan"
+	xmlns:InputXSLT="function.inputxslt.application"
+	exclude-result-prefixes="xalan InputXSLT"
+>
+
+<xsl:include href="[utility/datasource.xsl]"/>
+
+<xsl:variable name="meta">
+	<datasource type="main"    mode="full" source="target/01_files/source.xml" target="files"/>
+	<datasource type="support" mode="full" source="target/02_data/pages.xml"   target="pages"/>
+	<target     mode="plain"   value="categories.xml"/> 
+</xsl:variable>
+
+<xsl:template name="get_page_data">
+	<xsl:param name="handle"/>
+
+	<xsl:variable name="page" select="$root/pages/entry[@handle = $handle]"/>
+
+	<title>
+		<xsl:value-of select="$page/title"/>
+	</title>
+	<digest>
+		<xsl:copy-of select="$page/content/p[1]/node()"/>
+	</digest>
+</xsl:template>
+
+<xsl:template match="files/pages/*[name() != 'file']">
+	<entry handle="{name()}">
+		<xsl:apply-templates />
+	</entry>
+</xsl:template>
+
+<xsl:template match="files/pages/*/file[./extension = '.md']">
+	<page handle="{./name}">
+		<xsl:call-template name="get_page_data">
+			<xsl:with-param name="handle" select="./name"/>
+		</xsl:call-template>
+	</page>
+</xsl:template>
+
+</xsl:stylesheet>