return flat list from derived object's formulate()
The StdinDataRedirection command object was returning a list inside a list, which caused trouble when getting the "str()" of the command.
Simple example to demonstrate the problem:
Python 3.10.8 (tags/v3.10.8:aaaf517, Oct 11 2022, 16:50:30) [MSC v.1933 64 bit (AMD64)] on win32
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>>> from plumbum.cmd import head
>>> cmd = head['-2'] << "one\ntwo\nthree\nfour"
>>> print(f"{cmd}")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Python310\lib\site-packages\plumbum\commands\base.py", line 66, in __str__
return " ".join(self.formulate())
TypeError: sequence item 2: expected str instance, list found
>>>
return flat list from derived object's formulate()
The StdinDataRedirection command object was returning a list inside a list, which caused trouble when getting the "str()" of the command.
Simple example to demonstrate the problem:
This addresses open issue #398