Replaced function-like data resolution with template applications

* e.g. article and tag support data is now fetched through direct _XPath_ template applications
** this required the introduction of a special `resolve` mode to prevent interaction between support and main content resolution
** in most cases arguments had to be wrapped inside helper constants to enable selection of e.g. article support data via the `@handle` attribute using the current elements `@handle` attribute
* analogously to the recent changes in _StaticXSLT_ this commit aims to improve the XSLT code style used in generating this static website

3 files changed, 35 insertions, 47 deletions

diff --git a/source/02_meta/articles.xsl b/source/02_meta/articles.xsl
index 1a8b8fa..f91ff1e 100644
--- a/source/02_meta/articles.xsl
+++ b/source/02_meta/articles.xsl
@@ -11,31 +11,27 @@
 	<target     mode="plain" value="articles.xml"/> 
 </xsl:variable>
 
-<xsl:key name="years" match="datasource/articles/entry/date/year/text()" use="." />
+<xsl:key name="years" match="datasource/articles/entry/date/year/text()" use="."/>
+
+<xsl:template match="articles/entry" mode="resolve">
+	<article handle="{@handle}">
+		<title>
+			<xsl:value-of select="title"/>
+		</title>
+		<date>
+			<xsl:value-of select="date/full"/>
+		</date>
+	</article>
+</xsl:template>
 
 <xsl:template match="articles">
 	<xsl:for-each select="entry/date/year/text()[generate-id() = generate-id(key('years',.)[1])]">
+		<xsl:variable name="year" select="."/>
+
 		<entry handle="{.}">
-			<xsl:call-template name="get_articles">
-				<xsl:with-param name="year" select="."/>
-			</xsl:call-template>
+			<xsl:apply-templates select="$root/articles/entry[./date/year = $year]" mode="resolve"/>
 		</entry>
 	</xsl:for-each>
 </xsl:template>
 
-<xsl:template name="get_articles">
-	<xsl:param name="year"/>
-
-	<xsl:for-each select="/datasource/articles/entry[date/year = $year]">
-		<article handle="{@handle}">
-			<title>
-				<xsl:value-of select="title"/>
-			</title>
-			<date>
-				<xsl:value-of select="date/full"/>
-			</date>
-		</article>
-	</xsl:for-each>
-</xsl:template>
-
 </xsl:stylesheet>
diff --git a/source/02_meta/categories.xsl b/source/02_meta/categories.xsl
index 1a06aa1..ea8593b 100644
--- a/source/02_meta/categories.xsl
+++ b/source/02_meta/categories.xsl
@@ -15,17 +15,13 @@
 	<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 = $handle]"/>
-
-	<page handle="{$handle}">
+<xsl:template match="pages/entry" mode="resolve">
+	<page handle="{@handle}">
 		<title>
-			<xsl:value-of select="$page/title"/>
+			<xsl:value-of select="title"/>
 		</title>
-		<digest size="{string-length($page/content/p[1])}">
-			<xsl:copy-of select="$page/content/p[1]/node()"/>
+		<digest size="{string-length(content/p[1])}">
+			<xsl:copy-of select="content/p[1]/node()"/>
 		</digest>
 	</page>
 </xsl:template>
@@ -37,9 +33,9 @@
 </xsl:template>
 
 <xsl:template match="files/directory[@name = 'pages']/*/file[@extension = '.md']">
-	<xsl:call-template name="get_page_data">
-		<xsl:with-param name="handle" select="@name"/>
-	</xsl:call-template>
+	<xsl:variable name="handle" select="@name"/>
+
+	<xsl:apply-templates select="$root/pages/entry[@handle = $handle]" mode="resolve"/>
 </xsl:template>
 
 </xsl:stylesheet>
diff --git a/source/02_meta/tags.xsl b/source/02_meta/tags.xsl
index 20b1f10..3c95932 100644
--- a/source/02_meta/tags.xsl
+++ b/source/02_meta/tags.xsl
@@ -12,17 +12,15 @@
 	<target     mode="plain"   value="tags.xml"/> 
 </xsl:variable>
 
-<xsl:template name="get_article_data">
-	<xsl:param name="handle"/>
-
-	<xsl:variable name="article" select="$root/articles/entry[@handle = $handle]/*[self::title | self::date]"/>
-
-	<title>
-		<xsl:value-of select="$article/self::title"/>
-	</title>
-	<date>
-		<xsl:value-of select="$article/self::date/full"/>
-	</date>
+<xsl:template match="articles/entry" mode="resolve">
+	<article handle="{@handle}">
+		<title>
+			<xsl:value-of select="title"/>
+		</title>
+		<date>
+			<xsl:value-of select="date/full"/>
+		</date>
+	</article>
 </xsl:template>
 
 <xsl:template match="tags/entry">
@@ -32,11 +30,9 @@
 </xsl:template>
 
 <xsl:template match="tags/*/article">
-	<article handle="{@handle}">
-		<xsl:call-template name="get_article_data">
-			<xsl:with-param name="handle" select="@handle"/>
-		</xsl:call-template>
-	</article>
+	<xsl:variable name="handle" select="@handle"/>
+
+	<xsl:apply-templates select="$root/articles/entry[@handle = $handle]" mode="resolve"/>
 </xsl:template>
 
 </xsl:stylesheet>