From e06b2ff405259b3d4a8f49ec83e4ae69f84f75f6 Mon Sep 17 00:00:00 2001
From: mstsirkin <mstsirkin@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652>
Date: Thu, 21 May 2015 10:13:22 +0000
Subject: fixupdiff.pl: more work-arounds for latexdiff

work around more latexdiff issues:
- force FL style within headers
- fix beginFL ending with end and vice versa
  across begin/end of enum or itemize

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

git-svn-id: https://tools.oasis-open.org/version-control/svn/virtio/branches/v1.0@534 0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652
---
 fixupdiff.pl | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/fixupdiff.pl b/fixupdiff.pl
index 70d4e30..94c5112 100644
--- a/fixupdiff.pl
+++ b/fixupdiff.pl
@@ -1,3 +1,6 @@
+my $bufferdiff="";
+my $diff="";
+my $buffer="";
 my $lstlisting=0;
 while (<>) {
 	my $line = $_;
@@ -6,6 +9,61 @@ while (<>) {
 	}
 	if ($lstlisting) {
 		$line =~ s/%DIFDELCMD\s+<\s+//;
+		#print "%FIXED BY RULE 1\n";
+	}
+	#In section headings, replace begin/end with begin/endFL,
+	#but be careful in case some tag spills over to the next
+	#line
+	if (m/\\(section|subsection|subsubsection|paragraph)/ and m/DIF/) {
+		my @list = split(/(\\DIF(?:add|del)(?:begin|end)(?:FL)?)/, $line, -1);
+		#if there's only one tag, don't touch it:
+		#matching one is on the other line
+		if ($#list >= 5) {
+			#if first tag is end, don't touch it - matching
+			#begin is on the previous line
+			if ($list[1] =~ m/begin$/) {
+				$list[1] .= "FL";
+			}
+			#if last tag is begin, don't touch it - matching
+			#end is on the next line
+			if ($list[$#list - 1] =~ m/end$/) {
+				$list[$#list - 1] .= "FL";
+			}
+		}
+		for (my $i = 3; $i <= $#list - 3; $i += 2) {
+			if (not $list[$i] =~ m/FL$/) {
+				$list[$i] .= "FL";
+			}
+		}
+		$line = join("", @list);
+		#print "%FIXED BY RULE 2\n";
+	}
+	#detect where we have DIFbegin/end cross
+	#enumerate/itemize environments and fix up
+	if (m/\\DIF(?:add|del)(?:begin|end)/) {
+		my @list = split(/(\\DIF(?:add|del)(?:begin|end)(?:FL)?)/, $line, -1);
+		$diff = $list[$#list - 1];
+		if ($diff =~ m/begin/) {
+			$diff =~ s/begin/end/;
+		} else {
+			$diff = "";
+		}
+	}
+	if ($diff ne "" and m/\\(?:begin|end){(?:enumerate|itemize)}$/ and not m/\\DIF/) {
+		$buffer = $line;
+		$bufferdiff = $diff;
+		$line = "";
+		#print "%BUFFERED BY RULE 3: $bufferdiff\n";
+	}
+	if ($buffer ne "" and $line ne "") {
+		if (m/^(\\DIF(?:add|del)end(?:FL)?)/ and $bufferdiff ne $1) {
+			$line =~ s/^(\\DIF(?:add|del)end(?:FL)?)//;
+			$buffer =~ s/(\\(?:begin|end){(?:enumerate|itemize)})$/$bufferdiff$1/;
+			#print "%FIXED BY RULE 3: $bufferdiff\n";
+		}
+		print $buffer;
+		$buffer = "";
+		$bufferdiff = "";
 	}
 	print $line;
 	if (m/%DIFDELCMD\s+<\s+\\end{lstlisting}/) {
-- 
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