Improve cscope script so it's easier to customize.

It still does the same thing as before.

cscope_gen.sh

@@ -1,5 +1,35 @@
 #!/usr/bin/env bash
 
-find . \( -path './action_skel_code' -prune -o -path './.git' -prune -o -path './lib' -prune -o -path '*/gtest' -prune -o -name '*.cpp' -o -name '*.inl' -o -name '*.hpp' -o -name '*.h' -o -name '*.c' \) -a -type f > cscope.files
+function join {
+	local separator="$1"
+	shift
+	local retval="$( printf "${separator}%s" "$@" )"
+	retval="${retval:${#separator}}"
+	echo "${retval}"
+}
+
+excl_directories=(
+    ./action_skel_code
+    ./.git
+    ./lib
+    "*/gtest"
+)
+excl_paths="-path $(join " -prune -o -path " "${excl_directories[@]}") -prune"
+
+excl_wholefiles=(
+)
+if [ ${#excl_wholefiles[@]} -gt 0 ]; then
+    excl_files="-a ! -wholename $(join " -a ! -wholename " "${excl_wholefiles[@]}")"
+else
+    excl_files=""
+fi
+
+include_extensions=( cpp inl hpp h c )
+incl_extensions="-name *.$(join " -o -name *." "${include_extensions[@]}")"
+
+#Don't expand * - see http://stackoverflow.com/questions/102049/how-do-i-escape-the-wildcard-asterisk-character-in-bash
+set -f
+find . \( $excl_paths -o $incl_extensions \) -a -type f $excl_files > cscope.files
+set +f
 
 cscope -b -q