From 8d5ff2c5141ae10b85c26277f4d3ef56d37b26da Mon Sep 17 00:00:00 2001
From: Geoff McLane <ubuntu@geoffair.info>
Date: Tue, 27 Mar 2018 15:36:15 +0200
Subject: [PATCH] Is #692 - Add a 'CleanHead' service

---
 src/clean.c   | 31 +++++++++++++++++++++++++++++++
 src/clean.h   |  3 +++
 src/tidylib.c |  2 ++
 3 files changed, 36 insertions(+)

diff --git a/src/clean.c b/src/clean.c
index e96dd3f..61c9596 100644
--- a/src/clean.c
+++ b/src/clean.c
@@ -2780,6 +2780,37 @@ void TY_(CleanStyle)(TidyDocImpl* doc, Node *html)
 /* ==================================================
  */
 
+/*
+ * CleanHead - clean the head node, if it exists, and we
+ * are going to show it in the output.
+ * Issue #692 - Remove multiple title elements
+ */
+void TY_(CleanHead)(TidyDocImpl* doc)
+{
+    Node *head, *node, *next;
+    uint titles = 0;
+    if (cfgAutoBool(doc, TidyBodyOnly) == TidyYesState)
+        return; /* not going to show head, so forget it */
+    head = TY_(FindHEAD)(doc);
+    if (!head)
+        return;
+    node = head->content;
+    while (node)
+    {
+        next = node->next;  /* get any 'next' */
+        if (nodeIsTITLE(node))
+        {
+            titles++;
+            if (titles > 1)
+            {
+                TY_(Report)(doc, head, node, DISCARDING_UNEXPECTED);
+                TY_(DiscardElement)(doc, node); /* delete this node */
+            }
+        }
+        node = next;
+    }
+}
+
 /*
  * local variables:
  * mode: c
diff --git a/src/clean.h b/src/clean.h
index f0ef7a6..c765e81 100644
--- a/src/clean.h
+++ b/src/clean.h
@@ -75,5 +75,8 @@ void TY_(FixLanguageInformation)(TidyDocImpl* doc, Node* node, Bool wantXmlLang,
 
 /* Issue #567 - move style elements from body to head */
 void TY_(CleanStyle)(TidyDocImpl* doc, Node *html);
+/* Issue #692 - discard multiple titles */
+void TY_(CleanHead)(TidyDocImpl* doc);
+
 
 #endif /* __CLEAN_H__ */
diff --git a/src/tidylib.c b/src/tidylib.c
index 67d7a37..7396c74 100644
--- a/src/tidylib.c
+++ b/src/tidylib.c
@@ -2153,6 +2153,8 @@ int         tidyDocCleanAndRepair( TidyDocImpl* doc )
         }
     }
 
+    TY_(CleanHead)(doc); /* Is #692 - discard multiple <title> tags */
+
 #if defined(ENABLE_DEBUG_LOG)
     SPRTF("All nodes AFTER clean and repair\n");
     dbg_show_all_nodes( doc, &doc->root, 0  );