do not try to read from stdin when it is non-interactive (#5733)

add '--no-input' command-line option and 'input' config file option
to allow users to manually configure this

docs/configuration.rst

@@ -461,6 +461,17 @@ Description
     (see `getpass() <https://docs.python.org/3/library/getpass.html#getpass.getpass>`__).
 
 
+extractor.*.input
+-----------------
+Type
+    ``bool``
+Default
+    ``true`` if `stdin` is attached to a terminal ,
+    ``false`` otherwise
+Description
+    Allow prompting the user for interactive input.
+
+
 extractor.*.netrc
 -----------------
 Type

docs/options.md

@@ -30,6 +30,7 @@
     -x, --input-file-delete FILE
                                 Download URLs found in FILE. Delete them after
                                 they were downloaded successfully.
+    --no-input                  Do not prompt for passwords/tokens
 
 ## Output Options:
     -q, --quiet                 Activate quiet mode