fix: Reset seen_slugs cache on every prep run (#1011)

* refactor: Move seen_slugs and slugify_name into PrepToolWriter

* fix: Clear the _seen_slugs cache on each call to prep()

* test: Run yestests

Changes many HTML id elements to drop the "-2" suffix, which I
believe was spurious.

tests/valid/indexes.pages.text

@@ -3,9 +3,9 @@
 
 
 Network Working Group                                     H. Person, Ed.
-Internet-Draft                                             June 19, 2023
+Internet-Draft                                             June 22, 2023
 Intended status: Experimental                                           
-Expires: December 21, 2023
+Expires: December 24, 2023
 
 
                           xml2rfc index tests
@@ -26,7 +26,7 @@ Status of This Memo
    time.  It is inappropriate to use Internet-Drafts as reference
    material or to cite them other than as "work in progress."
 
-   This Internet-Draft will expire on December 21, 2023.
+   This Internet-Draft will expire on December 24, 2023.
 
 Copyright Notice
 
@@ -53,7 +53,7 @@ Table of Contents
 
 
 
-Person                  Expires December 21, 2023               [Page 1]
+Person                  Expires December 24, 2023               [Page 1]
 
 Internet-Draft             xml2rfc index tests                 June 2023
 
@@ -109,7 +109,7 @@ Index
 
 
 
-Person                  Expires December 21, 2023               [Page 2]
+Person                  Expires December 24, 2023               [Page 2]
 
 Internet-Draft             xml2rfc index tests                 June 2023
 
@@ -165,4 +165,4 @@ Author's Address
 
 
 
-Person                  Expires December 21, 2023               [Page 3]
+Person                  Expires December 24, 2023               [Page 3]

tests/valid/indexes.prepped.xml

@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='utf-8'?>
-<rfc xmlns:xi="http://www.w3.org/2001/XInclude" version="3" sortRefs="true" category="exp" submissionType="independent" ipr="trust200902" docName="indexes-00" indexInclude="true" prepTime="2023-06-19T05:27:04" scripts="Common,Latin" symRefs="true" tocDepth="3" tocInclude="true">
+<rfc xmlns:xi="http://www.w3.org/2001/XInclude" version="3" sortRefs="true" category="exp" submissionType="independent" ipr="trust200902" docName="indexes-00" indexInclude="true" prepTime="2023-06-22T15:05:51" scripts="Common,Latin" symRefs="true" tocDepth="3" tocInclude="true">
   <!-- xml2rfc v2v3 conversion 3.17.3 -->
 
 
@@ -20,7 +20,7 @@
         </postal>
       </address>
     </author>
-    <date day="19" month="06" year="2023"/>
+    <date day="22" month="06" year="2023"/>
     <boilerplate>
       <section anchor="status-of-memo" numbered="false" removeInRFC="false" toc="exclude" pn="section-boilerplate.1">
         <name slugifiedName="name-status-of-this-memo">Status of This Memo</name>
@@ -41,7 +41,7 @@
         material or to cite them other than as "work in progress."
         </t>
         <t indent="0" pn="section-boilerplate.1-4">
-        This Internet-Draft will expire on 21 December 2023.
+        This Internet-Draft will expire on 24 December 2023.
         </t>
       </section>
       <section anchor="copyright" numbered="false" removeInRFC="false" toc="exclude" pn="section-boilerplate.2">

tests/valid/indexes.text

@@ -3,9 +3,9 @@
 
 
 Network Working Group                                     H. Person, Ed.
-Internet-Draft                                             June 19, 2023
+Internet-Draft                                             June 22, 2023
 Intended status: Experimental                                           
-Expires: December 21, 2023
+Expires: December 24, 2023
 
 
                           xml2rfc index tests
@@ -26,7 +26,7 @@ Status of This Memo
    time.  It is inappropriate to use Internet-Drafts as reference
    material or to cite them other than as "work in progress."
 
-   This Internet-Draft will expire on December 21, 2023.
+   This Internet-Draft will expire on December 24, 2023.
 
 Copyright Notice
 

tests/valid/indexes.v3.html

@@ -23,7 +23,7 @@
 </tr></thead>
 <tfoot><tr>
 <td class="left">Person</td>
-<td class="center">Expires December 21, 2023</td>
+<td class="center">Expires December 24, 2023</td>
 <td class="right">[Page]</td>
 </tr></tfoot>
 </table>
@@ -36,12 +36,12 @@
 <dd class="internet-draft">indexes-00</dd>
 <dt class="label-published">Published:</dt>
 <dd class="published">
-<time datetime="2023-06-19" class="published">June 19, 2023</time>
+<time datetime="2023-06-22" class="published">June 22, 2023</time>
     </dd>
 <dt class="label-intended-status">Intended Status:</dt>
 <dd class="intended-status">Experimental</dd>
 <dt class="label-expires">Expires:</dt>
-<dd class="expires"><time datetime="2023-12-21">December 21, 2023</time></dd>
+<dd class="expires"><time datetime="2023-12-24">December 24, 2023</time></dd>
 <dt class="label-authors">Author:</dt>
 <dd class="authors">
 <div class="author">
@@ -71,7 +71,7 @@ <h2 id="name-status-of-this-memo">
         time. It is inappropriate to use Internet-Drafts as reference
         material or to cite them other than as "work in progress."<a href="#section-boilerplate.1-3" class="pilcrow">¶</a></p>
 <p id="section-boilerplate.1-4">
-        This Internet-Draft will expire on December 21, 2023.<a href="#section-boilerplate.1-4" class="pilcrow">¶</a></p>
+        This Internet-Draft will expire on December 24, 2023.<a href="#section-boilerplate.1-4" class="pilcrow">¶</a></p>
 </section>
 </div>
 <div id="copyright">

tests/valid/manpage.txt

@@ -1,5 +1,5 @@
 xml2rfc(1)                                                    xml2rfc(1)
-                                                            19 June 2023
+                                                            22 June 2023
 
 
                   Xml2rfc Vocabulary Version 3 Schema