[PATCH v3 RESEND 2/2] highlight: add a workaround for the --force bug

[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 |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/filters/syntax-highlighting.sh b/filters/syntax-highlighting.sh
index 65baaa0..cbc3056 100755
--- a/filters/syntax-highlighting.sh
+++ b/filters/syntax-highlighting.sh
@@ -59,5 +59,23 @@ if [[ ${highlightVersion} -le 2 ]]; then
   exec highlight --force -f -I -X -S $EXTENSION 2>/dev/null
 else
   # for highlight versions >= 3.x
+
+  #
+  # On CentOS 6.2 (using highlight from EPEL), when highlight doesn't know about
+  # an EXTENSION, it outputs a lua error and _no_ text, even when the --force
+  # option is used.
+  #
+  # Also see the bug reports at:
+  # http://sourceforge.net/tracker/?func=detail&aid=3490017&group_id=215618&atid=1034391
+  # https://bugzilla.redhat.com/show_bug.cgi?id=795567
+  #
+  # This workaround can be removed when the bug is fixed upstream and the new
+  # version is packaged in most distributions.
+  #
+  # The workaround is to set the extension to 'txt' (plain text) when highlight
+  # exits with an error (doesn't know the format).
+  echo "test" | highlight -f -I -O xhtml -S $EXTENSION &>/dev/null
+  [ ${?} -ne 0 ] && EXTENSION="txt"
+
   exec highlight --force -f -I -O xhtml -S $EXTENSION 2>/dev/null
 fi
-- 
1.7.7.6