1 files changed, 77 insertions, 0 deletions
diff --git a/fixupdiff.pl b/fixupdiff.pl
new file mode 100644
index 0000000..e557e2b
--- /dev/null
+++ b/fixupdiff.pl
@@ -0,0 +1,77 @@
+my $bufferdiff="";
+my $diff="";
+my $buffer="";
+while (<>) {
+	my $line = $_;
+	if (m/%DIFDELCMD\s+<\s+\\begin{lstlisting}/) {
+		$lstlisting=1;
+		$line =~s/%DIFDELCMD\s+</{\\lstset{escapechar=\\\$} /;
+	}
+	if ($lstlisting) {
+		$line =~ s/%DIFDELCMD\s+< //;
+		if (not $line =~ m/\\(?:begin|end){lstlisting}/) {
+			$line =~ s/([#&{} ])/\\$1/g;
+			$line =~ s/(.*)/\$\\DIFdel{$1}\$/;
+		}
+		#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}/) {
+		print "}\n";
+		$lstlisting=0;
+	}
+}