improve logic of extraction and combination

fsfe.xsl

@@ -18,16 +18,16 @@
     <xsl:if test="/buildinfo/document/@external">https://fsfe.org</xsl:if>
   </xsl:variable>
 
-  <!-- EXTRACT -->
+  <!-- EXTRACT / DESCRIPTION of each page -->
   <xsl:variable name="metadesc">
     <!-- Get the meta element description -->
     <xsl:value-of select="/buildinfo/document/head/meta[@name = 'description']/@content" />
   </xsl:variable>
 
-  <!-- if there is a meta description, take that -->
+  <!-- if there is a meta description, take that as an extract -->
   <xsl:variable name="extract">
     <xsl:choose>
-      <!-- if there is a meta description, take that -->
+      <!-- case 1: if there is a meta description, take that -->
       <xsl:when test="$metadesc != ''">
         <xsl:value-of select="$metadesc" />
       </xsl:when>
@@ -35,37 +35,31 @@
         <!-- take a first extract which should be sufficient for most pages -->
         <xsl:variable name="extract1">
           <!-- retrieve the first 200 letters of the first p element after h1 -->
-          <xsl:value-of select="substring(normalize-space(/buildinfo/document/body/h1[1]/following::p[1]),1,200)" />
-        </xsl:variable>
-        <!-- measure first extract length -->
-        <xsl:variable name="extractlength1">
-          <xsl:value-of select="string-length($extract1)" />
+          <xsl:value-of select="substring(normalize-space(/buildinfo/document/body/h1[1]/following::p[1]),1,155)" />
         </xsl:variable>
         <!-- define cases what happens with which extract length -->
         <xsl:choose>
-          <!-- case: first extract is long enough -->
-          <xsl:when test="$extractlength1 &gt; 50">
+          <!-- case 2: first paragraph is long enough -->
+          <xsl:when test="string-length($extract1) &gt; 50">
             <xsl:value-of select="$extract1" />
             <xsl:text>...</xsl:text>
           </xsl:when>
-          <!-- case: first extract is too short -->
+          <!-- case 3: first paragraph is too short -->
           <xsl:otherwise>
             <xsl:variable name="extract2">
               <!-- retrieve the first 200 letters of the *second* p element after h1 -->
-              <xsl:value-of select="substring(normalize-space(/buildinfo/document/body/h1[1]/following::p[2]),1,200)" />
-            </xsl:variable>
-            <!-- measure *second* extract length -->
-            <xsl:variable name="extractlength2">
-              <xsl:value-of select="string-length($extract2)" />
+              <xsl:value-of select="substring(normalize-space(/buildinfo/document/body/h1[1]/following::p[2]),1,155)" />
             </xsl:variable>
             <xsl:choose>
-              <!-- case: second extract is long enough -->
-              <xsl:when test="$extractlength2 &gt; 50">
-                <xsl:value-of select="$extract2" />
+              <!-- case 3a: second paragraph is long enough -->
+              <xsl:when test="string-length($extract2) &gt; 50">
+                <!-- Combine $extract1 and $extract2 with max. 155 characters -->
+                <xsl:value-of select="substring(normalize-space(concat($extract1, ' ', $extract2)),1,155)" />
+                <xsl:text>...</xsl:text>
               </xsl:when>
-              <!-- case: second extract is too short, so take default text -->
+              <!-- case 3b: also second extract is too short, so take a default text -->
               <xsl:otherwise>
-                Non profit organisation working to create general understanding and support for software freedom. Includes news, events, and campaigns.
+                <xsl:text>Free Software Foundation Europe is a charity that empowers users to control technology. We enable people to use, understand, adapt and share software.</xsl:text>
               </xsl:otherwise>
             </xsl:choose>
           </xsl:otherwise>