From f8d9e5a2392af0ac33bc7ffc06a8c94748acb133 Mon Sep 17 00:00:00 2001
From: Andrew Mussey <git@amussey.com>
Date: Sun, 31 Mar 2019 23:54:49 -0700
Subject: [PATCH] Add a help dialog to hcltool.

---
 scripts/hcltool | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/scripts/hcltool b/scripts/hcltool
index 78cac14..2f80ac0 100644
--- a/scripts/hcltool
+++ b/scripts/hcltool
@@ -18,7 +18,17 @@ import sys
 import json
 import hcl
 
+HELP_DIALOG = """{filename} [infile [outfile]]
+
+If `infile` is not provided, `infile` defaults to `stdin`.
+If `outfile` is not provided, `outfile` defaults to `stdout`."""
+
 def main():
+    help_args = ['-h', '--help']
+    if any([x for x in sys.argv if x.lower() in help_args]):
+        print(HELP_DIALOG.format(filename=sys.argv[0]))
+        return
+
     if len(sys.argv) == 1:
         infile = sys.stdin
         outfile = sys.stdout