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+#! /usr/bin/perl
+
+# $Cambridge: exim/doc/doc-docbook/TidyHTML-spec,v 1.1 2005/06/16 10:32:31 ph10 Exp $
+
+# Script to tidy up the spec HTML files that are generated by xmlto. The
+# following changes are made:
+#
+# 1. Tidy the index.html file by splitting the very long lines.
+# 2. Create reverse links from chapter and section titles back to the TOC.
+# 3. Tidy the ix01.html file - the actual index - by splitting long lines.
+# 4. Insert links from the letter divisions to the top of the Index.
+
+chdir "spec.html";
+
+$tocref = 1;
+
+# Read in the index.html file. It's really the TOC.
+
+open(IN, "index.html") || die "Failed to open index.html for reading: $!\n";
+@toc = <IN>;
+close(IN);
+
+# Insert a newline after every > because the whole toc is generated as one
+# humungous line that is hard to check. Then split the lines so that each one
+# is a separate element in the vector.
+
+foreach $line (@toc) { $line =~ s/>\s*/>\n/g; }
+for ($i = 0; $i < scalar(@toc); $i++)
+  { splice @toc, $i, 1, (split /(?<=\n)/, $toc[$i]); }
+
+# We want to create reverse links from each chapter and section title back to
+# the relevant place in the TOC. Scan the TOC for the relevant entries. Add
+# an id to each entry, and create tables that remember the file names and the
+# new link ids.
+
+foreach $line (@toc)
+  {
+  if ($line =~ /^<a href="((?:ch|ix)\d+\.html)(#[^"]+)?">/)
+    {
+    my($chix) = $1;
+    my($ss) = $2;
+    my($id) = sprintf "%04d", $tocref++;
+    $line =~ s/<a/<a id="toc$id"/;
+    $backref{"$chix$ss"} = "toc$id";
+    push @chlist, $chix;
+    }
+  }
+
+# Write out the modified index.html file.
+
+open (OUT, ">index.html") || die "Failed to open index.html for writing: $!\n";
+print OUT @toc;
+close(OUT);
+
+# Now scan each of the other page files and insert the reverse links.
+
+foreach $file (@chlist)
+  {
+  open(IN, "$file") || die "Failed to open $file for reading: $!\n";
+  @text = <IN>;
+  close(IN);
+
+  foreach $line (@text)
+    {
+    if ($line =~ /^(.*?)<a( xmlns="[^"]+")? id="([^"]+)"><\/a>(.+?)<\/h(.*)$/)
+      {
+      my($pre, $opt, $id, $title, $post) = ($1, $2, $3, $4, $5);
+
+      # Section reference
+      my($ref) = $backref{"$file#$id"};
+
+      # If not found, try for a chapter reference
+      $ref = $backref{"$file"} if !defined $ref;
+
+      # Adjust the line
+      $line = "$pre<a$opt href=\"index.html#$ref\" id=\"$id\">$title</a></h$post";
+      }
+    }
+
+  open(OUT, ">$file") || die "Failed to open $file for writing: $!\n";
+  print OUT @text;
+  close(OUT);
+  }
+
+# Now process the ix01.html file
+
+open(IN, "ix01.html") || die "Failed to open ix01.html for reading: $!\n";
+@index = <IN>;
+close(IN);
+
+# Insert a newline after every > because the whole index is generated as one
+# humungous line that is hard to check. Then split the lines so that each one
+# is a separate element in the vector.
+
+foreach $line (@index) { $line =~ s/>\s*/>\n/g; }
+for ($i = 0; $i < scalar(@index); $i++)
+  { splice @index, $i, 1, (split /(?<=\n)/, $index[$i]); }
+
+# We want to add a list of letters at the top of the index, and link back
+# to them from each letter heading. First find the index title and remember
+# where to insert the list of letters.
+
+for ($i = 0; $i < scalar(@index); $i++)
+  {
+  if ($index[$i] =~ /^<\/h2>$/)
+    {
+    $listindex = $i;
+    last;
+    }
+  }
+
+# Now scan through for the letter headings and build the cross references,
+# while also building up the list to insert.
+
+$list = "<h4>\n";
+for (; $i < scalar(@index); $i++)
+  {
+  if ($index[$i] =~ /^(.)<\/h3>$/)
+    {
+    $letter = $1;
+    $index[$i-1] =~ s/^/<a id="${letter}B" href="#${letter}T">/;
+    $index[$i] =~ s/$/<\/a>/;
+    $list .= "<a id=\"${letter}T\" href=\"#${letter}B\"> $letter</a>\n";
+    }
+  }
+
+# Now we know which letters we have, we can insert the list.
+
+$list .= "</h4>\n";
+splice @index, $listindex, 0, $list;
+
+# Write out the modified index.html file.
+
+open (OUT, ">ix01.html") || die "Failed to open ix01.html for writing: $!\n";
+print OUT @index;
+close(OUT);
+
+
+# End