Add option to print command to standard output

[telotortium]

I use llm cmd because it takes care of the prompting to extract just a command from the LLM. Sometimes I don't want to edit and run the command, but just copy it. I can always just manually copy and paste, but it might be nice to use this from a keyboard shortcut or something like that, in which case the readline interface gets in the way.

Neither llm cmd ... </dev/null nor llm cmd ... | cat works as a workaround right now.

[dbosk]

I don't think that an option is necessary. Just to add the following in the right place:

if os.isatty(sys.stdin.fileno()):
    # do what we do now
else:
    # just print plain text to stdout