proper tty handling for pipes

Makefile

@@ -51,6 +51,7 @@ check::
 	poetry run black . --check
 	poetry run isort . --check
 	poetry run flake8 . --ignore=E501,W503
+	bash -n *.sh
 
 lint::
 	isort .

src/bipsea/bipsea.py

@@ -2,7 +2,6 @@
 
 import logging
 import re
-import select
 import sys
 
 import click
@@ -307,12 +306,9 @@ def no_empty_param(name: str, val, msg="Must not be empty."):
 
 
 def try_for_pipe_input():
-    stdin, _, _ = select.select([sys.stdin], [], [], TIMEOUT)
-    if stdin:
-        lines = sys.stdin.readlines()
-        if lines:
-            # get just the last line because there might be a warning above
-            return lines[-1].strip()
+    if not sys.stdin.isatty():
+        return sys.stdin.read().strip()
+    return ""
 
 
 if __name__ == "__main__":

test-readme.sh

@@ -11,20 +11,28 @@ poetry run bipsea validate --help
 poetry run bipsea xprv --help
 poetry run bipsea derive --help
 
-poetry run bipsea mnemonic | poetry run bipsea validate 
+poetry run bipsea mnemonic | poetry run bipsea validate | poetry run bipsea xprv | bipsea derive -a mnemonic -n 12
 
-poetry run bipsea xprv -m "$MNEMONIC" | poetry run bipsea derive -a mnemonic -n 12
+poetry run bipsea mnemonic -t jpn -n 15
+
+poetry run bipsea mnemonic -n 12 --pretty
 
 poetry run bipsea mnemonic -t spa -n 12 | poetry run bipsea validate -f spa
 
+poetry run bipsea mnemonic | poetry run bipsea validate
+
+poetry run bipsea mnemonic | poetry run bipsea validate | poetry run bipsea xprv
+
+poetry run bipsea xprv -m "$MNEMONIC" | poetry run bipsea derive -a mnemonic -n 12
+
 poetry run bipsea validate -f free -m "123456123456123456" | poetry run bipsea xprv
 
 poetry run bipsea validate -f free -m "$(cat input.txt)"
 
-poetry run bipsea xprv -m "$MNEMONIC" | poetry run bipsea derive -a base85
+poetry run bipsea validate -m $MNEMONIC | poetry run bipsea xprv | poetry run bipsea derive -a base85
 
-poetry run bipsea xprv -m "$MNEMONIC" | poetry run bipsea derive -a mnemonic -t jpn -n 12
+poetry run bipsea validate -m "$MNEMONIC" | poetry run bipsea xprv | poetry run bipsea derive -a mnemonic -t jpn -n 12
 
-poetry run bipsea xprv -m "$MNEMONIC" | poetry run bipsea derive -a drng -n 1000
+poetry run bipsea validate -m "$MNEMONIC" | poetry run bipsea xprv | poetry run bipsea derive -a drng -n 1000
 
-poetry run bipsea xprv -m "$MNEMONIC" | poetry run bipsea derive -a dice -n 100 -s 6
+poetry run bipsea validate -m "$MNEMONIC" | poetry run bipsea xprv | poetry run bipsea derive -a dice -n 100 -s 6