From cc75efcbf4a83473ae4aa409476212ceb4b4daf5 Mon Sep 17 00:00:00 2001
From: Mischa POSLAWSKY <perl@shiar.org>
Date: Sun, 22 Feb 2015 03:33:20 +0100
Subject: [PATCH] digraphs: mkdigraphs-vim: usage help if given arguments

---
 tools/mkdigraphs-vim | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/mkdigraphs-vim b/tools/mkdigraphs-vim
index a4bdfe8..b9ab426 100755
--- a/tools/mkdigraphs-vim
+++ b/tools/mkdigraphs-vim
@@ -2,6 +2,13 @@
 
 VERSION=1.01
 
+if [ "$#" -ne 0 ]
+then
+	echo "Usage: $0 >digraphs-vim.inc.pl"
+	echo 'Collect digraph data from vim, standard output as Perl hash.'
+	exit 64 # EX_USAGE
+fi
+
 vim -e -c'echo version' -cdigraphs -cq | perl -CSD -nE '
 	if ($. == 1) { # head
 		say "# digraphs list from vim version ", s/\s*\z//r;
-- 
2.30.0