[PATCH v3 RESEND 1/2] highlight: fix commandline options for different highlight versions

[mailings at hupie.com (Ferry Huberts)]

From: Ferry Huberts <ferry.huberts at pelagic.nl>

Signed-off-by: Ferry Huberts <ferry.huberts at pelagic.nl>
---
 filters/syntax-highlighting.sh |   20 +++++++++++++++++++-
 1 files changed, 19 insertions(+), 1 deletions(-)

diff --git a/filters/syntax-highlighting.sh b/filters/syntax-highlighting.sh
index 6283ce9..65baaa0 100755
--- a/filters/syntax-highlighting.sh
+++ b/filters/syntax-highlighting.sh
@@ -42,4 +42,22 @@ EXTENSION="${BASENAME##*.}"
 # map Makefile and Makefile.* to .mk
 [ "${BASENAME%%.*}" == "Makefile" ] && EXTENSION=mk
 
-exec highlight --force -f -I -X -S $EXTENSION 2>/dev/null
+#
+# highlight versions 2 and 3 have different commandline options. Specifically,
+# the -X option that is used for version 2 is replaced by the -O xhtml option
+# for version 3.
+#
+# Version 2 can be found (for example) on CentOS 5, while version 3 can be
+# found (for example) on CentOS 6.
+#
+# get highlight version
+regex='^[[:space:]]*highlight[[:space:]]+version[[:space:]]+([[:digit:]]+).*'
+highlightVersion=$(highlight --version | grep -E "${regex}" | sed -r "s/${regex}/\1/")
+
+if [[ ${highlightVersion} -le 2 ]]; then
+  # for highlight versions <= 2.x
+  exec highlight --force -f -I -X -S $EXTENSION 2>/dev/null
+else
+  # for highlight versions >= 3.x
+  exec highlight --force -f -I -O xhtml -S $EXTENSION 2>/dev/null
+fi
-- 
1.7.7.6