From c8eb29f54cdb12b702a2065be124c852cc40742b Mon Sep 17 00:00:00 2001
From: Eduard Braun <Eduard.Braun2@gmx.de>
Date: Tue, 16 Aug 2016 22:08:49 +0200
Subject: [PATCH] Print usage information if no input file was specified (and
 no data is available from `stdin`)

---
 scour/scour.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scour/scour.py b/scour/scour.py
index 430cfa1..b41034b 100644
--- a/scour/scour.py
+++ b/scour/scour.py
@@ -3301,6 +3301,9 @@ def parse_args(args=None, ignore_additional_args=False):
         infile = sys.stdin.buffer
       except AttributeError:
         infile = sys.stdin
+      # the user probably does not want to manually enter SVG code into the terminal...
+      if sys.stdin.isatty():
+         _options_parser.error("No input file specified, see --help for detailed usage information")
    if options.outfilename:
       outfile = maybe_gziped_file(options.outfilename, "wb")
    else: