feed: support category

Author: soimort

_pi.yaml

@@ -6,12 +6,12 @@ uri-prefix-history:  https://github.com/soimort/soimort.github.io/commits/master
 uri-prefix-edit:     https://github.com/soimort/soimort.github.io/edit/master
 
 feed:
-  file:              feed.atom
   title:             Through the Looking-Glass
   subtitle:          "Mort Yao's homepage"
   id-prefix:         tag:www.soimort.org,2017:/
   author-name:       Mort Yao
   author-email:      [email protected]
+  file:              feed.atom
 feed-template:       feed.xml
 feed-yaml:           feed.yaml
 

feed.atom

@@ -20,6 +20,7 @@
     <author>
       <name>Mort Yao</name>
     </author>
+    
     <content type="html" xml:lang="en" xml:base="https://www.soimort.org/">
 <![CDATA[
 <p>
@@ -282,6 +283,7 @@ T. M. Cover and J. A. Thomas. <em>Elements of Information Theory</em>, 2nd ed.
     <author>
       <name>Mort Yao</name>
     </author>
+    
     <content type="html" xml:lang="en" xml:base="https://www.soimort.org/">
 <![CDATA[
 <p>
@@ -676,6 +678,7 @@ R. L. Benson, “The Venona story.” <a href="https://www.nsa.gov/about/cryptol
     <author>
       <name>Mort Yao</name>
     </author>
+    
     <content type="html" xml:lang="en" xml:base="https://www.soimort.org/">
 <![CDATA[
 <p>
@@ -1087,6 +1090,7 @@ M. Baron, <em>Probability and Statistics for Computer Scientists</em>, 2nd ed.
     <author>
       <name>Mort Yao</name>
     </author>
+    
     <content type="html" xml:lang="en" xml:base="https://www.soimort.org/">
 <![CDATA[
 <p>
@@ -1208,6 +1212,7 @@ And here goes the patch: (Applied to Caja 1.16.1; definitely UNWARRANTED)
     <author>
       <name>Mort Yao</name>
     </author>
+    
     <content type="html" xml:lang="en" xml:base="https://www.soimort.org/">
 <![CDATA[
 <p>
@@ -1476,6 +1481,7 @@ Semantically, they are not recognized as theorems, just normal text paragraphs.
     <author>
       <name>Mort Yao</name>
     </author>
+    
     <content type="html" xml:lang="en" xml:base="https://www.soimort.org/">
 <![CDATA[
 <p>

feed.xml

@@ -21,6 +21,7 @@ $for(entry)$
     <author>
       <name>$entry.author-name$</name>
     </author>
+    $for(category)$<category term="$entry.category$" />$endfor$
     <content type="html" xml:lang="en" xml:base="$canonical$">
 <![CDATA[
 $entry.body$