From 0927e27939f8ff02f9cd41d1ba6846b18b4dc5f6 Mon Sep 17 00:00:00 2001
From: Chris Berkhout <chrisberkhout@gmail.com>
Date: Sat, 12 Jun 2021 16:10:50 +0200
Subject: [PATCH] Error handling for end date before start date.

---
 src/pricehist/cli.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/pricehist/cli.py b/src/pricehist/cli.py
index ece6f94..494d58d 100644
--- a/src/pricehist/cli.py
+++ b/src/pricehist/cli.py
@@ -47,6 +47,11 @@ def cli(args=None, output_file=sys.stdout):
             else:
                 start = source.start()
                 logging.info(f"Using the source default start date of {start}.")
+            if args.end < start:
+                logging.critical(
+                    f"The end date '{args.end}' preceeds the start date '{start}'!"
+                )
+                sys.exit(1)
             series = Series(
                 base=args.pair[0],
                 quote=args.pair[1],