From 038d41eaa2ab37dba4988904463aac7bda5151e6 Mon Sep 17 00:00:00 2001
From: Oleg Broytman <phd@phdru.name>
Date: Thu, 30 Jan 2014 23:07:40 +0400
Subject: [PATCH] Forbid filtering from console to console - show usage instead

---
 TODO          | 1 -
 mimedecode.py | 4 ++++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/TODO b/TODO
index bd35fb7..e69de29 100644
--- a/TODO
+++ b/TODO
@@ -1 +0,0 @@
-Forbid filtering stdin to stdout - require one of them to be a file.
diff --git a/mimedecode.py b/mimedecode.py
index f46165b..34c495f 100755
--- a/mimedecode.py
+++ b/mimedecode.py
@@ -389,6 +389,10 @@ if __name__ == "__main__":
     else:
         usage(1, 'Too many arguments')
 
+    if (infile is sys.stdin) and (outfile is sys.stdout) and \
+            sys.stdin.isatty() and sys.stdout.isatty():
+        usage(1, 'Filtering from console to console is forbidden')
+
     gopts.outfile = outfile
     decode_file(infile)
 
-- 
2.39.2