static int html_link(
  struct Blob *ob,
  struct Blob *link,
  struct Blob *title,
  struct Blob *content,
  void *opaque
){
  char *zLink = blob_buffer(link);
  BLOB_APPEND_LITERAL(ob, "<a href=\"");
  if( zLink[0]=='/' ){
    /* For any hyperlink that begins with "/", make it refer to the root
    ** of the Fossil repository */
    blob_append(ob, g.zTop, -1);
  }
  html_escape(ob, blob_buffer(link), blob_size(link));
  if( title && blob_size(title)>0 ){
    BLOB_APPEND_LITERAL(ob, "\" title=\"");
    html_escape(ob, blob_buffer(title), blob_size(title));
  }
  BLOB_APPEND_LITERAL(ob, "\">");
  BLOB_APPEND_BLOB(ob, content);