From 282b2a4166aeba76e3b99abaa46bf6858f7cd172 Mon Sep 17 00:00:00 2001
From: Ralph Amissah <ralph.amissah@gmail.com>
Date: Sat, 12 Sep 2026 22:59:01 -0400
Subject: epub, html: document heads and ids, fixes

One document head per file, and ids must be unique. No remaining fatal
errors in the epub in the marup sample set.

(assisted by Claude-Code)
---
 src/sisudoc/outputs/io_out/epub3.d | 11 +++++++++--
 src/sisudoc/outputs/io_out/xmls.d  |  8 ++++----
 2 files changed, 13 insertions(+), 6 deletions(-)

(limited to 'src')

diff --git a/src/sisudoc/outputs/io_out/epub3.d b/src/sisudoc/outputs/io_out/epub3.d
index d149dac..1c08bab 100644
--- a/src/sisudoc/outputs/io_out/epub3.d
+++ b/src/sisudoc/outputs/io_out/epub3.d
@@ -306,6 +306,13 @@ template outputEPub3() {
     static auto rgx = RgxO();
     static auto rgx_xhtml = RgxXHTML();
     string segment_filename;
+    /+ ↓ a segment file gets one document head, not one per heading. +/
+    bool[string] _seg_head_written;
+    string _segHead(M)(M _m, string _seg) {
+      if (_seg in _seg_head_written) { return ""; }
+      _seg_head_written[_seg] = true;
+      return xhtml_format.epub3_seg_head(_m);
+    }
     string[] top_level_headings = ["","","",""];
     string[string] oepbs_content_parts;
     bool[string]   _segment_files_seen;   /+ a segment file is listed once +/
@@ -351,7 +358,7 @@ template outputEPub3() {
               goto default;
             default:
               epubWrite.doc_parts ~= obj.tags.segment_anchor_tag_epub;
-              epubWrite.doc_epub3[obj.tags.segment_anchor_tag_epub] ~= xhtml_format.epub3_seg_head(doc.matters);
+              epubWrite.doc_epub3[obj.tags.segment_anchor_tag_epub] ~= _segHead(doc.matters, obj.tags.segment_anchor_tag_epub);
               Tuple!(string, string[]) t = xhtml_format.heading_seg(_txt, obj, doc.matters, suffix, "epub");
               epubWrite.doc_epub3[obj.tags.segment_anchor_tag_epub] ~= t[0];
               epubWrite.doc_epub3_endnotes[obj.tags.segment_anchor_tag_epub] ~= t[1];
@@ -360,7 +367,7 @@ template outputEPub3() {
             break;
           case 4:
             segment_filename = obj.tags.segment_anchor_tag_epub;
-            epubWrite.doc_epub3[segment_filename] ~= xhtml_format.epub3_seg_head(doc.matters);
+            epubWrite.doc_epub3[segment_filename] ~= _segHead(doc.matters, segment_filename);
             Tuple!(string, string[]) t = xhtml_format.heading_seg(_txt, obj, doc.matters, suffix, "epub");
             epubWrite.doc_epub3[segment_filename] ~= t[0];
             epubWrite.doc_epub3_endnotes[segment_filename] ~= t[1];
diff --git a/src/sisudoc/outputs/io_out/xmls.d b/src/sisudoc/outputs/io_out/xmls.d
index 3f7f4c9..f1bcd95 100644
--- a/src/sisudoc/outputs/io_out/xmls.d
+++ b/src/sisudoc/outputs/io_out/xmls.d
@@ -495,7 +495,7 @@ string tail(M)(M doc_matters) {
   string o;
   o = format(q"┃<hr />
   <div class="rights">
-    <p class="small" id="copyright"><a name="copyright"></a>
+    <p class="small" id="copyright">
       <b>Copyright:</b> %s
     </p>
   </div>
@@ -507,10 +507,10 @@ string tail(M)(M doc_matters) {
   </div>
   <hr />
   <div class="generator">
-    <p class="small_center" id="sisu_spine"><a name="sisu_spine"></a>
+    <p class="small_center" id="sisu_spine">
       <a href="https://sisudoc.org" class="lnkicon">≅ SiSU Spine ፨</a> (object numbering &amp; object search)
     </p>
-    <p class="small_center" id="sisu_spine"><a name="sisu_spine"></a>
+    <p class="small_center" id="sisu_spine_dates">
       (web 1993, object numbering 1997, object search 2002 ...) 2026
     </p>
   </div>
@@ -903,7 +903,7 @@ string tail(M)(M doc_matters) {
         if (obj.metainfo.is_of_section == "toc") {
           o ~= format(q"┃
       <div class="substance">
-        <p class="small" id="copyright"><a name="copyright"></a>
+        <p class="small" id="copyright_toc">
           Copyright: %s
         </p>
         <!-- <p class="small" id="rights"><a name="rights"></a>
-- 
cgit v1.2.3