Add some example filter scripts

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

filters/commit-links.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+# This script can be used to generate links in commit messages - the first
+# sed expression generates links to commits referenced by their SHA1, while
+# the second expression generates links to a fictional bugtracker.
+#
+# To use this script, refer to this file with either the commit-filter or the
+# repo.commit-filter options in cgitrc.
+
+sed -re '
+s|\b([0-9a-fA-F]{8,40})\b|<a href="./?id=\1">\1</a>|g
+s| #([0-9]+)\b|<a href="http://bugs.example.com/?bug=\1">#\1</a>|g
+'

filters/syntax-highlighting.sh

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+#!/bin/sh
+# This script can be used to implement syntax highlighting in the cgit
+# tree-view by refering to this file with the source-filter or repo.source-
+# filter options in cgitrc.
+#
+# Note: the highlight command (http://www.andre-simon.de/) uses css for syntax
+# highlighting, so you'll probably want something like the following included
+# in your css file (generated by highlight 2.4.8 and adapted for cgit):
+#
+# table.blob .num  { color:#2928ff; }
+# table.blob .esc  { color:#ff00ff; }
+# table.blob .str  { color:#ff0000; }
+# table.blob .dstr { color:#818100; }
+# table.blob .slc  { color:#838183; font-style:italic; }
+# table.blob .com  { color:#838183; font-style:italic; }
+# table.blob .dir  { color:#008200; }
+# table.blob .sym  { color:#000000; }
+# table.blob .kwa  { color:#000000; font-weight:bold; }
+# table.blob .kwb  { color:#830000; }
+# table.blob .kwc  { color:#000000; font-weight:bold; }
+# table.blob .kwd  { color:#010181; }
+
+case "$1" in
+	*.c)
+		highlight -f -I -X -S c
+		;;
+	*.h)
+		highlight -f -I -X -S c
+		;;
+	*.sh)
+		highlight -f -I -X -S sh
+		;;
+	*.css)
+		highlight -f -I -X -S css
+		;;
+	*)
+		highlight -f -I -X -S txt
+		;;
+esac