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

9 files changed, 67 insertions, 87 deletions

diff --git a/source/01_data/articles.xsl b/source/01_data/articles.xsl
index e207117..c25fe2a 100644
--- a/source/01_data/articles.xsl
+++ b/source/01_data/articles.xsl
@@ -12,17 +12,13 @@
 
 <xsl:variable name="meta">
 	<datasource type="main"  mode="xpath" source="$source_tree/directory[@name = '00_content']/directory" target="files"/>
-	<target     mode="plain" value="articles.xml"/> 
+	<target     mode="plain" value="articles.xml"/>
 </xsl:variable>
 
-<xsl:template name="list_tags">
-	<xsl:param name="path"/>
-
-	<xsl:for-each select="$root/files/directory[@name = 'tags']/*[./file/full = $path]">
-		<tag>
-			<xsl:value-of select="@name"/>
-		</tag>
-	</xsl:for-each>
+<xsl:template match="files/directory[@name = 'tags']/*" mode="resolve">
+	<tag>
+		<xsl:value-of select="@name"/>
+	</tag>
 </xsl:template>
 
 <xsl:template match="files/directory[@name = 'articles']">
@@ -51,9 +47,9 @@
 			</year>
 		</date>
 		<tags>
-			<xsl:call-template name="list_tags">
-				<xsl:with-param name="path" select="./full"/>
-			</xsl:call-template>
+			<xsl:variable name="self" select="."/>
+
+			<xsl:apply-templates select="$root/files/directory[@name = 'tags']/*[./file/full = $self/full]" mode="resolve"/>
 		</tags>
 		<content>
 			<xsl:copy-of select="xalan:nodeset($content)/*[name() != 'h1']"/>
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>
diff --git a/source/99_result/archive.xsl b/source/99_result/archive.xsl
index 31d8354..8ef7d9a 100644
--- a/source/99_result/archive.xsl
+++ b/source/99_result/archive.xsl
@@ -11,7 +11,7 @@
 	<datasource type="main"    mode="full" source="02_meta/articles.xml"     target="articles"/>
 	<datasource type="support" mode="full" source="02_meta/meta.xml"         target="meta"/>
 	<datasource type="support" mode="full" source="00_content/microblog.xml" target="microblog"/>
-	<target     mode="plain"   value="archive/index.html"/> 
+	<target     mode="plain"   value="archive/index.html"/>
 </xsl:variable>
 
 <xsl:template name="title-text">Archive</xsl:template>
diff --git a/source/99_result/article/article.xsl b/source/99_result/article/article.xsl
index 37e2fda..d34df77 100644
--- a/source/99_result/article/article.xsl
+++ b/source/99_result/article/article.xsl
@@ -31,7 +31,7 @@
 			<xsl:call-template name="format-date">
 				<xsl:with-param name="date" select="date/full"/>
 				<xsl:with-param name="format" select="'M x, Y'"/>
-			</xsl:call-template> 
+			</xsl:call-template>
 			<xsl:text> | </xsl:text>
 			<xsl:for-each select="tags/tag">
 				<a href="/tag/{.}">
diff --git a/source/99_result/atom.xsl b/source/99_result/atom.xsl
index b5fffdd..4972bb8 100644
--- a/source/99_result/atom.xsl
+++ b/source/99_result/atom.xsl
@@ -17,7 +17,7 @@
 <xsl:variable name="meta">
 	<datasource type="main"    mode="full" source="01_data/articles.xml" target="articles"/>
 	<datasource type="support" mode="full" source="02_meta/meta.xml"     target="meta"/>
-	<target     mode="plain"   value="atom.xml"/> 
+	<target     mode="plain"   value="atom.xml"/>
 </xsl:variable>
 
 <xsl:variable name="url"    select="datasource/meta/url"/>
diff --git a/source/99_result/stream.xsl b/source/99_result/stream.xsl
index 5d2218c..d71b094 100644
--- a/source/99_result/stream.xsl
+++ b/source/99_result/stream.xsl
@@ -28,24 +28,20 @@
 	</xsl:choose>
 </xsl:template>
 
-<xsl:template name="get_article">
-	<xsl:param name="handle"/>
-
-	<xsl:variable name="article" select="$root/articles/entry[@handle = $handle]"/>
-
+<xsl:template match="articles/entry" mode="resolve">
 	<h2>
 		<xsl:text>» </xsl:text>
-		<a href="/article/{$handle}">
-			<xsl:value-of select="$article/title"/>
+		<a href="/article/{@handle}">
+			<xsl:value-of select="title"/>
 		</a>
 	</h2>
 	<p class="info">
 		<xsl:call-template name="format-date">
-			<xsl:with-param name="date" select="$article/date/full"/>
+			<xsl:with-param name="date" select="date/full"/>
 			<xsl:with-param name="format" select="'M x, Y'"/>
-		</xsl:call-template> 
+		</xsl:call-template>
 		<xsl:text> | </xsl:text>
-		<xsl:for-each select="$article/tags/tag">
+		<xsl:for-each select="tags/tag">
 			<a href="/tag/{.}">
 				<xsl:value-of select="."/>
 			</a>
@@ -55,7 +51,7 @@
 		<xsl:value-of select="$root/meta/author"/>
 	</p>
 
-	<xsl:apply-templates select="$article/content/node()" mode="xhtml"/>
+	<xsl:apply-templates select="content/node()" mode="xhtml"/>
 </xsl:template>
 
 <xsl:template match="page/entry">
@@ -80,19 +76,17 @@
 </xsl:template>
 
 <xsl:template match="page/entry/article">
+	<xsl:variable name="handle" select="@handle"/>
+
 	<xsl:choose>
 		<xsl:when test="position() = last()">
 			<div class="last article">
-				<xsl:call-template name="get_article">
-					<xsl:with-param name="handle" select="@handle"/>
-				</xsl:call-template>
+				<xsl:apply-templates select="$root/articles/entry[@handle = $handle]" mode="resolve"/>
 			</div>
 		</xsl:when>
 		<xsl:otherwise>
 			<div class="article">
-				<xsl:call-template name="get_article">
-					<xsl:with-param name="handle" select="@handle"/>
-				</xsl:call-template>
+				<xsl:apply-templates select="$root/articles/entry[@handle = $handle]" mode="resolve"/>
 			</div>
 		</xsl:otherwise>
 	</xsl:choose>
diff --git a/utility/master.xsl b/utility/master.xsl
index 84ecfe7..cb9e025 100644
--- a/utility/master.xsl
+++ b/utility/master.xsl
@@ -16,6 +16,14 @@
 
 <xsl:variable name="root" select="datasource"/>
 
+<xsl:template match="meta/tags/entry" mode="master">
+	<li>
+		<a href="/tag/{@handle}">
+			<xsl:value-of select="@handle"/>
+		</a>
+	</li>
+</xsl:template>
+
 <xsl:template match="/">
 <html>
 <head>
@@ -26,7 +34,7 @@
 	<meta name="viewport"           content="width=device-width,initial-scale=1.0"/>
 
 	<link rel="stylesheet"    type="text/css"     href="/main.css" />
-	<link rel="shortcut icon" type="image/x-icon" href="/media/favicon.ico" /> 
+	<link rel="shortcut icon" type="image/x-icon" href="/media/favicon.ico" />
 
 	<title>
 		<xsl:call-template name="title-text"/> @ <xsl:value-of select="$root/meta/title"/>
@@ -65,13 +73,7 @@
 
 			<div id="tags">
 				<ul>
-					<xsl:for-each select="datasource/meta/tags/entry">
-						<li>
-							<a href="/tag/{@handle}">
-								<xsl:value-of select="@handle"/>
-							</a>
-						</li>
-					</xsl:for-each>
+					<xsl:apply-templates select="datasource/meta/tags/entry" mode="master"/>
 				</ul>
 			</div>