todolist: user rg instead of grep

scripts/todolist

@@ -4,8 +4,14 @@
 
 [ -n "$1" ] && cd "$1"
 
+if ! command -v rg &>/dev/null; then
+	GREP_CMD="grep -R -n"
+else
+	GREP_CMD="rg"
+fi
+
 if git rev-parse --show-toplevel &>/dev/null; then
-	grep -n -R "^[[:space:]]*[#/\";-]*[[:space:]]*TODO:" . \
+	$GREP_CMD "^[[:space:]]*[#/\";-]*[[:space:]]*TODO:" . \
 		| expand \
 		| sed -r 's/([[:digit:]]):/\1:@@ /' \
 		| tr -s ' ' \