Implement --fingerprint option for manual fingerprint checking

main.py

@@ -28,6 +28,10 @@ BUF_SIZE = 65536  # Linux default pipe capacity is 64KiB (64 * 2^10)
     '--file', '-f', default=None, type=click.Path(exists=True),
     help='Calculate from file or directory (recursive).'
 )
+@click.option(
+    '--fingerprint', '-p', default=False, required=False, is_flag=True,
+    help='Print fingerprint instead of identicon.'
+)
 def main(**kwargs):
     if not (stream := get_input_stream(kwargs)):
         print_usage_and_exit()
@@ -35,9 +39,12 @@ def main(**kwargs):
     digest = get_digest(stream.stream)
     stream.close()
 
-    i = Identicon(digest)
-    i.calculate()
-    print(i)
+    if not kwargs.get('fingerprint'):
+        i = Identicon(digest)
+        i.calculate()
+        print(i)
+    else:
+        print(digest.hex())
 
 
 def get_input_stream(kwargs):